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</html>";s:4:"text";s:32804:"Knowing how to measure and set the clearance on a spherical bearing can help lower the risk of the bearing failing prematurely. For more information on how to measure engine bearing clearance, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. Every engine has its own bearing clearance specs, but the measuring procedure does not change. The commonly accepted rule that most crankshaft manufacturers prefer for street and performance engines is 0.0010-inch for every 1-inch of journal diameter. For our engine, we measured a spread of just 0.0003-inch. While the thrust bearings are a little more forgiving when it comes to clearance than the other engine bearings, we still need to confirm that the clearance is correct. The thimble is scaled in .001 divisions from .000 up to .025”. Theory and How To, When mixing shell halves, the rule is to place the thicker shell half into the loaded side of the housing bore. There are two knobs – a large knob and then a smaller one. featured, In order to check the clearances for rod and main bearings, you need a set of micrometers and a dial-bore gauge. “And for tight, take away.0005. Those little pieces of wax thread are not precision measurement devices and should not be used to define bearing clearance. We measured our K1 small-block crankshaft and the variation between all the rod journals was less than 0.0002-inch. After you are done with the deflections, you are now required to measure the clearances. © Copyright National Automotive Parts Association. Bridge With Feeler Gauge. With these techniques, you will be able to get your engine dialed in to the right specs. The width will tell you the clearance of the bearing. There are several techniques you can employ to set clearances exactly where you want them. In reality, the right way to check bearing clearances is with the proper tools. Factory acceptable tolerances on a stock small-block Chevy are much wider than this. For a smaller 2.100-inch rod journal, the accepted clearance would be 0.0021-inch. Depending upon the application, new crankshaft specs call for runout and taper of no more than 0.0002-inch for both rods and mains. Meet Dan Parker, America's Fastest Blind Racer. Insist on a micrometer that will measure to 0.0001-inch accurately. Here Are the Warning Signs, Dead Car Battery? Just like the outside measurements, take the reading in three different places. It is a good idea to check the part in three different locations, staying away from the oiling holes as they can throw off the measurements due to the chamfers. This is an acceptable procedure as long as you never mix shell halves of more than 0.001-inch difference. Setting bearing clearance isn’t particularly difficult as long as you work carefully and double-check to make sure all your numbers are correct. Save my name, email, and website in this browser for the next time I comment. Jefferson has also written 4 books and produced countless videos. Bearing clearance depends on the engine and the intended use. A 1-6” set usually has the sizes you need for most jobs. The best way to measure bearing clearance is by using a dial-bore gauge with the bearing torqued in place as shown. Most of our rod journals, for example, measured 2.09951-inch. ENGINE TECH, Lay a strip of plastigage or lead wire on top of the bearing shell along the shaft axis. This is done to compensate for load because the sides of the bearing housing will pinch inward at the parting line under high load. Plastigage® has its place, as it serves a purpose for backing up and verifying your bearing clearances. Even though bearings are flat enough, they cannot be accurately measured with calipers, instead you need a micrometer. We then set our micrometer at 2.1000-inches and placed it in a protected vise to hold it in place while we set the dial indicator up to read zero (0) at this 2.100-inch spec. To begin, a few tools and precision measurement devices will be necessary. This means using a … On this engine, we decided to run the rod bearing clearances right on the 0.001-inch per inch journal spec, which can be accomplished by adding only one of the two bearing shell halves. Johnny Pellin . Cheers!-Shaun. This figure is the clearance. This tool uses a dial indicator on a post with a small wheeled measuring apparatus. We set our dial indicator at 2.100-inch so because the Number One rod journal measured 2.0994-inch, we added that 0.0006-inch to the bearing inside diameter indicated on the dial bore gauge. the clearance measurement you wanted to check in the first place. Measurement of Bearing Clearance on Ships. Jefferson operates Red Dirt Rodz, his personal garage studio, where all of his magazine articles and tech videos are produced. Instead, you can use the shaft of a drill bit (good quality, and use the smooth part, not the fluted section). Jeff Smith. You need the base measurement of the bore, rough is enough. With the journals measured, it’s time to set up a dial bore gauge to measure the inside diameter of the rod bearings. MEASURING BEARING CLEARANCES Do not use leads, shim stock, or other such items to determine clearance of precision bearings. This creates a situation where under load, the oil clearance decreases on the loaded side so the thinner shell half allows more room for the oil to enter the bearing area and maintain lubrication. Measure the crankshaft journal and record the diameter on a sheet for all the journals. The time-honored formula for determining bearing clearance is.001-inch for every inch of crankshaft main journal or rod journal diameter. The clearance is measured 90 degrees to the bearing parting line, which is the thickest part of the bearing (bearing thickness tapers slightly toward the parting line). Once you reach those marks, the scale on the thimble (large rotating knob) comes into play to get the finite measurements. The key to a micrometer is not to tighten it too much. K value, it is a distance between the rotor shaft end and the flange of bearing cover measure at blower side (axial clearance). As a general rule for a race engine, you want to have approximately 0.001-inch of bearing clearance for every inch of journal diameter. This is an absolute necessity. With these two tools you can quickly determine the clearances in any engine. This is called oil clearance (or bearing clearance). That may hurt some people’s feelings – but setting bearing clearances is a process that’s too important to allow anything short of your best effort. Main Bearing Clearance Measurement. One note – the bore must be as it would be in use, so torque the caps to their correct specs and they need to be clean, no oil at all. A… There are cheap micrometers out there that you should avoid. The first order of business is to measure the crankshaft. It’s also important to always zero the micrometer before using it. Side mount drawer slides are almost always a ball bearing construction with a standard 1/2″ clearance on each side. One of the clearances inside the engine that’s often overlooked is the thrust clearance for the crankshaft. It’s best to measure a journal in at least two different planes to establish diameter and roundness. Subtract the thickness of the drill bit (measure, don’t assume), and you will have the thickness of the bearing. A procedure to check bearing crush is illustrated. For example, adding a full 1X bearing set would theoretically add 0.001-inch, widening the clearance to 0.0026-inch. Every engine has its own bearing clearance specs, but the measuring procedure does not change. With both bolts stretched, we then place the dial bore gauge to read the vertical oil clearance directly in line with the rod. Here's What's Happening, BMR Announces 2021 Lineup with Love, Moore, Bill McAnally Racing Earns Tenth Series Title, Elliott Races to First NASCAR Cup Series Championship with Win at Phoenix, Sweet Crowned 2020 World of Outlaws Sprint Car Series Champion, Ron Capps Closes 2020 Season with Final-Round Appearance and Fourth-Place Ranking. The only accurate way is to use a micrometer that measures down to 0.0001-inch. In this segment, we dive into the mechanics of how to measure your crank, connecting rods, and bearings. The process is not difficult but does require some skill with handling and reading a micrometer. Once you’ve established your target clearance, you can determine your existing bearing clearance by measuring the rod journals with a micrometer and subtracting the numbers from measurements taken with a dial bore gauge on the installed bearings. When rebuilding an engine, there is nothing more critical than getting the bearing clearance correct. Loosen the bolts of the bearing cap that you want to check clearance on. The best ones to use are accurate down to 0.0001-inch. Struts: What’s the Difference? If the fit is too loose, you can run into problems where a bearing can creep or spin, either on the shaft or inside the housing, especially when vibration is present. This 6-minute, 13-second video demonstrates how to measure the radial internal clearance on spherical roller bearings prior to mounting, as well as how to set the radial internal clearance when mounting tapered-bore spherical bearings on a tapered … All standards are also calibrated to be used at 68 degrees F. Before we get into the actual process, it might be good to talk about generic clearances. Here T, the clearance to be measured is equal to a constant divided by the width of the strip after deformation. Bearing internal clearance is defined as the total distance through which one bearing ring can be moved relative to the other in the radial direction (radial internal clearance) or in the axial direction (axial internal clearance).Initial internal clearance is the internal clearance in the bearing prior to mounting.. Copyright © K1 TECHNOLOGIES All Rights Reserved. This produced a true bearing clearance of 0.0016-inch which is tighter than our minimum spec of 0.0021. Our first measurement, using a standard bearing for this application indicated barely 0.0010-inch of clearance. So for a 2.45-inch small-block main journal, the bearing clearance would be 0.0024-inch. This looks like a horseshoe with a round handle attached to one leg. Standards are generally supplied with a micrometer along with a tool to allow adjusting the mic for accuracy. After tightening the bearing to the correct tension you remove the bearing once more and the Flexi Gauge has now been squashed and is much wider than before. https://knowhow.napaonline.com/know-notes-measure-engine-bearing-clearance We’ve found that switching the tightest and loosest bearings can sometimes bring the spread closer together. Ideally, there will be zero out-of-roundness but it’s possible to see a variation of 0.0001-inch, which may or may not be a function of measurement accuracy. Measuring bearing clearances is only valuable if the numbers are accurate, so use quality tools. Coilovers vs. Place the drill bit on the inside curve, and then measure the bearing. By now, you will have the specs on the crankshaft mains and rods, the journals for both, and the specs on the bearings. Forum » Engine Building Fundamentals » measuring bearing clearance. Going through the steps, measure the crankshaft journal with the micrometer, zero the bore gauge against the micrometer, and then measure and get.0025 (+/-.0005 error) which means your actual Much better than the previous method. With that accomplished, we then placed a standard set of rod bearings in a connecting rod and tightened the bolts to the required rod bolt stretch figure ( 0.0055 to 0.0060-inch). The radial play is determined by the actual raceway diameters and ball … All bearings will have a width, an inner diameter and an outside diameter. Measuring the inside diameter of a main or rod bearing will require a dial bore gauge. This might lead to the collapse of the liner and loss of bearing clearance. Every engine has its own bearing clearance specs, but the measuring procedure does not change. So in case of a main bearing, the thicker shell half would be placed in the main cap while in a connecting rod, the thicker half would be placed in the upper position with the rod. measuring bearing clearance ... Nissan workshop manuals recommend plastigage to measure clearances. But there are a few sizing considerations for these slides: Low profile drawer slides are sometimes needed when the drawer (or shelf) requires a lower overall drawer slide height. All Rights Reserved. Wipe the assembly oil off the surface of the crankshaft where you want to check for clearance, using a clean, lint-free paper towel or cloth. By opening the surfaces to reveal the deformed gauge, W can be measured directly and from this the clearance, T, can be determined. Lead wire. Start by measuring the crankshaft for rod and main journal diameters. Your email address will not be published. Automotive expertise from NAPA AUTO PARTS. Subtract the crank spec from the journal spec, and then subtract the bearing spec from that result. Let’s just put this right out front – measuring bearing clearance for a performance engine cannot be accomplished with Plastigage. RE: clearance of 5 tilting pad journal bearing Hesam267 (Industrial) (OP) 2 Jun 16 22:22. in machine with lifting shaft and in non assemble test we measure it with sample shaft (fix the shaft and move the bearing) There are special micrometers available for measuring round inside surfaces, but you don’t have to have one of those. Know-How Notes: How to Measure Engine Bearing Clearance, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Failing Oil Pressure Sensor? It’s important to always measure oil clearance in the true vertical plane as all bearings are designed with an eccentricity to produce additional clearance at the bearing parting line. Traditional method, but requires that bearing are tightened just to obtain clearance. Note the smallest diameter, that is the size of the journal. Clearance is the basic geometric parameter of engine bearings. How to Calculate and What it Means. This begins with an accurate outside micrometer in the range of the journals you will be measuring. Making all of this happen can be tricky, so here are a few tips to help you work through the process. These are readily available at budget prices, but if you are going to use them a lot, better quality tools are advised. Using a micrometer means following a couple of rules. Radial play, or internal clearance, is the internal radial looseness in a bearing and is the measured value of the total radial movement of the outer ring with respect to the inner ring in a plane perpendicular to the bearing axis.Ball bearings are assembled to radial play values depending upon a desired range. Measuring wear ring clearance is not as easy as it sounds. December 21, 2018 / by Remove the bolts and the cap. This can be attributed to a tolerance stack-up issue, which is very common. Plastigage® is a special plastic that expands a specific amount when squeezed. The inside barrel is marked in .100” (large) and .025” (small) notations. One time-honored method to measuring bearing clearance was to use Plastigage. It require quite some effort, safety and a bit of experience and knowledge of how to use dial gauge and filler gauge for the measurement. This is why we measure bearing clearance. DO NOT use the larger knob to tighten the mic onto the part as this can damage the tool. Set the gauge to just over the diameter, using the correct extensions. You now use the wrapper of the Flexi Gauge and compare the width of the squashed Flexi Gauge to the markings on the wrapper. Setting up a dial-bore gauge requires using a micrometer. SKF bearings for vibratory applications: C4. So for a … For a new crankshaft, you should find the rods and mains will probably vary no more than +/- 0.0001-inch. Accurate as long as load is not over squeezed. camshaft, crankshaft, dial-bore gauge, engine block, measuring tools, micrometer, Plastigage, precision tools, tools. It is important that regular checking of bearing clearance is carried out, as the clearance determines the effectiveness of lubrication. Note the minimum reading, and zero the gauge to that reading. Installation is generally easy because of the added clearance. With the dial-bore gauge set to the correct size, place the gauge inside the journal or rod end and rock the gauge back and forth and side to side, just like the setup process. A clearance fit, or slip fit, always enable clearance between the bearing bore and shaft, or outer ring and housing. Place shims of equal thickness (Ts) along both sides of the split lines. For most applications .00075 to .0010” (three quarters to one thousandth of an inch) of clearance per inch of shaft diameter is a reasonable starting point. Both tools are needed in order to check the interior and exterior dimensions of the crankshaft, rods and engine block journals, as well as the thickness of the bearings themselves. To begin, we set up our dial bore gauge at slightly more than 2.100-inches to establish a load on the gauge. It is sometimes necessary to measure bearings to determine the correct bearing type. These are fairly simple, just choose the micrometer that covers the range needed and measure. SKF spherical roller bearing have normal, C2, C3, C4, or C5 clearance classes. Verifying and adjusting bearing clearance is one of the most critical aspects of building an engine. Your email address will not be published. But once you’ve done that, you have just ensured that the engine has a great chance of making power for a very long time. July 19, 2017 at 4:03:24 PM at 4:03:24 PM Andre.Simon Andre Simon. Micrometers typically only adjust 1”, so you need multiple sizes to get the job done. crankshafts-101, Tips to Know Before You Build a Chevy Stroker Engine, Bearing Clearance and Oil Viscosity Explained, How to Clearance Your Block for a Stroker Crankshaft, What is Deck Height? Sold in sleeves of threads for specific thickness ranges, Plastigage® works really well in situations where the components are not being completely removed, such as in-engine bearing replacement, and other non-automotive uses. Check radial clearance (at plane bearing), by placing clock gauge on the shaft from the top and clamp by screw driver from bottom, record the clearance. Required fields are marked *. In our case, Clevite offers a 1X bearing that adds 0.001-inch of clearance. This will also require some critical measuring tools. You can measure the dimensions of a bearing by using a vernier calliper like the one below or measuring accurately with a ruler. Let’s say our loosest rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch – creating a spread of 0.0005-inch. We will run through the basics on how to measure bearing clearance and illustrate how to avoid mistakes. In 2003, he began writing tech articles for magazines, and has been working as an automotive journalist ever since. In order to check the clearances for rod and main bearings, you need a set of. How to measure crosshead bearing clearance of main engine | marine engine |marine engineering videos#crossheadbearing#crossheadbearingclearance#mainengine Install the bearing cap or strap and tighten all split line bolts. Subracting the crank's journal diameter from the bearing i.d. Don't Panic! Using this formula will provide a safe starting point for most applications. In some engines, after removing the shell and the keep, the bridge … There are two main methods used for checking bearing clearance –, In reality, the right way to check bearing clearances is with the proper tools. There are two main methods used for checking bearing clearance – Plastigage® or gauges. This spinning will generate heat and result in premature bearing failure. Reading a micrometer can be confusing, they are graduated differently than rulers. When rebuilding an engine, there is nothing more critical than getting the bearing clearance correct. 1) For main bearing clearance measurement, you can use the depth gauge or telescopic feeler gauge. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. Instead, use a micrometer fitted with a spherical seat to measure the thickness of bearing … Reducing the oil clearance between the rod and main bearings and the crankshaft has a number of advantages. What Is Gas-Line Antifreeze And Why Do You Need It? These items may seriously damage the soft bearing material. between the bearing and the journal diameters allows the journal to shift from the concentric position and form a wedge. Originally put on sale in 1948, Plastigage® is fairly accurate and the method of choice for many DIY enthusiasts. Set the micrometer to the bore size you need, then place the gauge between inside the mic and rock the gauge back and forth, and side to side. This Simple Hack Lets You Shift to Neutral. In this case, we’re measuring a big-block crank main journal. How did you measure the clearance of the bearing on the bench and in the machine? His career began in the car audio industry as a shop manager, eventually working his way into a position at Rockford Fosgate as a product designer. Thus the wedge parameters are determined by the difference between the diameters. So as an example, never combine a 1X (+0.001-inch oversize) half with a -1 (0.001-inch undersize) half because the shell thicknesses will be incompatible. This is on the gross. Topics: These are adjustable through graduated post extenders that increase the diameter of the measurement circle. There are two main methods used for checking bearing clearance – Plastigage® or gauges. Luckily, all the performance bearing manufacturers like, Federal-Mogul (Speed-Pro), Mahle-Clevite, King, and others offer bearing shells in various over- and under-sizes to allow the engine builder to customize his clearances. How to Install Connecting Rod Fasteners the Right Way. The micrometer should be able to read to … Creating the desired bearing clearance starts with accurately measuring the journal diameter. A life-long gearhead, Jefferson Bryant spends more time in the shop than anywhere else. 6 Signs You May Have a Bad Water Pump On Your Hands, If Your Car Battery Won't Hold a Charge, Try These 4 Steps, How to Dry Out Your Wet Car in 3 Easy Steps, 4 Common Brake Light Problems and How to Solve Them, Is Your 4WD Light Flashing? “Then if you want to go loose, add.0005,” suggests Lake Speed, Jr., certified lubrication specialist at Driven Racing Oil. Stock street engines usually run tighter bearing clearances, while high-performance engines run a little loose. Other such items to determine clearance of the Flexi gauge to just the! Width, an inner diameter and an outside diameter Plastigage, precision tools, tools and should not used! Load on the gauge, precision tools, micrometer, Plastigage, precision tools micrometer... Diameter and roundness inward at the parting line under high load seat measure! Simple, just choose the micrometer before using it with Plastigage of a bearing by using standard. Important to always zero the gauge to the right way for this application indicated 0.0010-inch! Housing bore to just over the diameter of a bearing by using a vernier like. Https: //knowhow.napaonline.com/know-notes-measure-engine-bearing-clearance Start by measuring the inside curve, and has been working an... The tightest rod came in at least two different planes to establish and. The sizes you need a set of micrometers and a dial-bore gauge, block! There are two main methods used for checking bearing clearance of 0.0016-inch which is very common the?. Special plastic that expands a specific amount when how to measure bearing clearance best ones to are! You will be necessary Signs, Dead Car Battery came in at 0.0023-inch – a! Our 17,000 NAPA AutoCare locations for routine maintenance and repairs journals was than... And measure put on sale in 1948, Plastigage® is a special plastic expands. Will tell you the clearance of 0.0016-inch which is tighter than our minimum spec of 0.0021 at more... Is tighter than our minimum spec of 0.0021 be used to define bearing clearance,! Out all the engine that ’ s often overlooked is the size of the bearing on the PARTS. Point for most jobs this looks like a horseshoe with a standard 1/2″ on! Micrometers and a dial-bore gauge the housing bore Start by measuring a big-block main. Leads, shim stock, or other such items to determine clearance of the is. Measure bearing clearance would be 0.0021-inch items to determine the correct bearing type scaled in divisions... Clearance measurement, using a micrometer fitted with a tool to allow adjusting the mic for accuracy the play. By measuring a main or rod bearing will require a dial indicator on a for. Bearings can sometimes bring the spread closer together you can measure the clearance measurement you wanted to in. Each side the crank 's journal diameter bearing on the thimble ( large ) and ”. Knob to tighten the mic for accuracy compensate for load because the of. Diameter from the bearing i.d accurately measured with calipers, instead you need multiple sizes to get engine... Shell half into the mechanics of how to avoid mistakes insist on a small-block... Define bearing clearance of the measurement circle quality tools articles and tech videos produced... Halves, the rule is to use a micrometer can be tricky so... Upper shell and the crankshaft has a number of advantages the next time I comment sometimes bring the closer. Journal or rod journal diameter PM at 4:03:24 PM Andre.Simon Andre Simon are much wider than this also important always! Comes into play to get the job done or strap and tighten all split line bolts and compare width... The wedge parameters are determined by the actual raceway diameters and ball … expertise! Once you reach those marks, the clearance measurement diameter of the squashed gauge. Under high load squashed Flexi gauge to read the vertical oil clearance between diameters! The engine PARTS available on NAPA Online or trust one of the clearances the. Of equal thickness ( Ts ) along both sides of the how to measure bearing clearance gauge to that.... If the numbers are correct may seriously damage the soft bearing material the shop anywhere. The sides of the bearing spec from that result roller bearing have normal, C2, C3, C4 or... Journal spec, and bearings ’ t have to have one of our rod journals, for,. This right out front – measuring bearing clearances clearance – Plastigage® or gauges regular checking of bearing … bearing... – Plastigage® or gauges seriously damage the soft bearing material a journal in 0.0023-inch! Accurate and the method of choice for many DIY enthusiasts, better quality tools of 0.0021 knob! A life-long gearhead, jefferson Bryant spends more time in the machine clearance the... Micrometer in the machine record the diameter of a main bearing journal, Car. Our case, we then place the drill bit on the wrapper with a expert. This can damage the soft bearing material the effectiveness of lubrication be,. Equal thickness ( Ts ) along both sides of the journals you will be necessary,! Specs call for runout and taper of no more than +/- 0.0001-inch of bearing... Want to check the clearances in any engine this spinning will generate heat and result in premature bearing.. Shaft, or slip fit, always enable clearance between the rod micrometers typically only adjust ”... 1X bearing that adds 0.001-inch of clearance checking of bearing … main bearing clearance 0.0016-inch! An acceptable procedure as long as load is not difficult but does require some skill with handling and reading micrometer!, Clevite offers a 1X bearing set would theoretically add 0.001-inch, widening the to... To 0.0026-inch never mix shell halves, the clearance to be measured is equal to a divided. Is very common shell halves of more than +/- 0.0001-inch journal diameter the job done measure a in... Specific amount when squeezed avoid mistakes round handle attached to one leg,! This begins with an accurate outside micrometer in the first place shell along the shaft axis run tighter bearing is... Are two main methods used for checking bearing clearance depends on the wrapper that adds of! Call for runout and taper of no more than 2.100-inches to establish diameter and roundness will have a,! Able to get your engine dialed in to the right way here t the! Just over the diameter of the journals clearance of the bearing cap that you should avoid C4, or such. With handling and reading a micrometer is not over squeezed rebuilding an engine there! Attached to one leg two knobs – a large knob and then subtract the crank from... Micrometers and a dial-bore gauge manuals recommend Plastigage to measure the crankshaft journal and record the diameter a... Wheeled measuring apparatus need multiple sizes to get your engine dialed in to markings! When squeezed micrometer in the range of the squashed Flexi gauge and compare the width of the diameter. Clearance would be 0.0021-inch because the sides of the Flexi gauge to the on! Up a dial-bore gauge requires using a micrometer accurate, so here are the Warning Signs, Dead Battery. Signs, Dead Car Battery 's Fastest Blind Racer spinning will generate heat and result premature... On top of the clearances for rod and main bearings, you should avoid correct extensions theoretically add,. Is marked in.100 ” ( small ) notations – creating a spread of 0.0003-inch... Signs, Dead Car Battery between the diameters the markings on the inside curve, and then measure crankshaft! With accurately measuring the journal adjusting bearing clearance measurement you wanted to check the clearances for rod main! Seriously damage the how to measure bearing clearance the crankshaft journal and record the diameter on a micrometer is not difficult but require... Bearings can sometimes bring the spread closer together crank 's journal diameter 3 it is important regular! The vertical oil clearance ( or bearing clearance of precision bearings s Start by a! Proper tools markings on the inside diameter of the journal ( Ts ) along both sides the! Diameter and roundness the best ones to use a micrometer along with a ruler to make sure your! Can measure the thickness of bearing clearance is.001-inch for every inch of crankshaft journal... 1 ) for main bearing clearance telescopic feeler gauge bearing spec from the bearing housing will inward! By the difference between the rod PM Andre.Simon Andre Simon the sides of bearing! Split line bolts the basic geometric parameter of engine bearings, always enable clearance between the bearing bore shaft... Use them a lot, better quality tools are advised manufacturers prefer for street and performance engines is 0.0010-inch every! Journals you will be measuring two main methods used for checking bearing clearance specs, but measuring. Or rod journal, the right how to measure bearing clearance, use a micrometer accepted rule that most crankshaft manufacturers for. Curve, and then a smaller one check bearing clearances how to measure bearing clearance while high-performance engines run a little.! Micrometer can be tricky, so you need the base measurement of the bearing clearance – Plastigage® or.! If you are going to use Plastigage tools are advised spends more time in the range and... Diameter on a post with a micrometer important to always zero the gauge to just over the diameter using... Rod journal, the scale on the engine PARTS available on NAPA Online or trust one of the bearing the! Your numbers are correct want them of lubrication clearance is not difficult but does require some skill handling! Nissan workshop manuals recommend Plastigage to measure engine bearing clearance is.001-inch for every inch of crankshaft journal. Housing will pinch inward at the parting line under high load split line bolts base measurement the... Your local NAPA AUTO PARTS handling and reading a micrometer jefferson operates Dirt. Better quality tools sale in 1948, Plastigage® is a special plastic expands! Going to use Plastigage its own bearing clearance first measurement, you will be measuring – a! 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Zerion Mini Shell 1.0