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A knock at this location indicates a rod or main bearing failure. Loosen the bearing cap nuts or bolts and remove the bearing cap and the lower half of the bearing. It's been a long time, but I think the bible, "How to Hot Rod BB Chevy" called for factory rec'd 1.5-2.5..?? CLEVITE MAIN BEARINGS - LS - FOR .010" UNDERSIZED CRANK - MS2199H10 $171.95. Find Clevite Engine Parts MS-2199H Clevite H-Series Main Bearings and get Free Shipping on Orders Over $99 at Summit Racing! Bearing, gear and shaft wear are the most common causes of noise. Stevenson holds a P.D.S Toyota certificate, ASE brake certification, Clean Air Act certification and a California smog license. There were tight spots, and even when the mains were loosened, there were tight … I never could trust plati-gauge. I have never lost an engine with bearings a little loose, I have from too tight. They really need to be lapped on a very flat surface like a surface plate or machined surface. Discussion Starter • #1 • 5 mo ago. Torque to spec and test rotation of the crank again. A correctly sized main bearing is also important for maintaining proper oil pressure. With the crankshaft installed and the main bearings snugged down, I tried to turn the crankshaft by hand. View All Crankshaft Main Bearings. 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. So, for a 2.5-inch main bearing, standard is .0025, loose is .003 and tight is .002." I just checked the main bearing clearance using plasti-gage and found all the mains to be at .0015 for the full width of the bearing surface. Engine bearing clearance is very important and can cause early failures if not correct. Mahle Aftermarket, which manufacturers Clevitte 77 bearings, offers a slightly different starting point with .0007 to .001 per inch of shaft diameter, and adds an option of an extra .0005 for performance engines. Loose is fast? Caution on this: the backs of the bearings are not flat. Ideally the rod bearings will be approx. The coarser the paper the more it tightens the clearance? I would like to see .002 as well on all bearings as stated above only way to get that is get the odd size bearings. .0025 is on the tight side and I wouldn't run anything that tight that's going to spin any considerable or or make any considerable power. Most of our dial bore gauges at the Naval Undersea Warfare Center, where I served a machinist apprenticeship, were made by Federal. Either that or try a set of ACL race bearings. 1 cylinder. Why are these bearings made so tight if everyone recommends around .0020" on an aluminum LS2. I've never heard of that method. The timing side bearing need not be a tight fit on the crank. I can't tell you everything I have read. Sand the back of the bearings, thats how clearance is fine tuned. As gear tooth faces and bearing races wear, they develop groves and small pits. Move the dipstick into sunlight and check for any metal reflections in the oil. The fit is determined by the nature of the application, load, size, type of bearing and which ring is rotating. If the head has been removed for any reason, there is no need to remove the spark plugs. 110 Posts . For a BB Chev 2.75 main journal, that's .0027" clearance. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, Google Books: How to Rebuild Big-Block Chevy Engine Hp 775, Remanufactured-engines: Engine Noise Diagnosis 101. This time on SPPTV we continue our Step by Step Series, Building our 5.3 L33 LS Engine. Careful installation procedures are, of course, critical in every aspect of engine building — careless errors are always expensive. The fit is determined by the nature of the application, load, size, type of bearing and which ring is rotating. When I tightened down the bolts on the last rod I was doing (#3), I couldn't turn the crank with a wrench on the pully bolt. There are three main types of shaft and housing fits. The 6 may be hand engraved on the bearing. Someone suggested .001 undersized but they don't make them in .010" size. Use a socket to remove the oil drain plug and let the oil drain into a pan. They can work well. The more power and rpm you make, the more parts are going to flex and take up the needed space to form an effective oil wedge. The bearings … .002 to .0025 clearance as will the main bearings. I'm replacing the rings on a '80's 4 cyl. A "tight" bearing clearance, ... As a rule of thumb, main bearing clearance should be targeted between 0.0025- and 0.0020-inch for most street and street/strip engines. Clip the timing light plug lead onto your no. The level of force required to properly mount a bearing is determined by the type and degree of press fit. If a connecting rod or main bearing cap is installed in the wrong position, or a bearing isn’t set into place securely, lubrication will be insufficient and cause failure. Use a socket and extension to loosen all of the oil pan bolts. What to do? (same combo now) cast crank, 289 2 bolt block. If the fit is too tight, the bearing integrity may be compromised by reduction of radial play in the assembly. Tap the center main bearing cap into its seated position. The main bearings are what supports the crankshaft. Explanation of the theory and most suitable bearing for your application below, be sure to select the correct bearing combination using our details section and tech centre. It was unbelievable. A number of ways to check this is if you pull and push on your pulley in situe you should feel a small amount of play between 0.065 and 0.125mm. I would have left them in if they were a real name brand bearing. Until the measurements are taken with a Sunnen dial bore gauge and setting fixture I would question the accuracy of the numbers. They are, when you compress them in a rod, but if you hone the backs, you'll see high and low spots. Main bearing sleeves come in two half-moon sections, one that sits inside the main bearing cap and one that sits in the engine block. Interesting. I just checked the main bearing clearance using plasti-gage and found all the mains to be at .0015 for the full width of the bearing surface. This requires performance rod bearings with these chamfers to be marked “upper” and “lower”. While holding shaft in forward position, tighten main cap bolts to 10 to 15 ft.lbs. Thanks Tom, I had HV pump last time, melling select Standard volume, Standard pressure this time. If one or two lobes nick the bearings, they will feel tight due to the high spots in the bearing left by the nicks! ... NJ306 is weaker) or 6 MRJA30. Install the washers and nuts, torque lightly, and test rotation of the crank. Once you have the new bearings, clean everything with brake cleaner, then assemble the bearing shells inside the conrod or main bearing mounts. Replacing main bearings is a critical part of any engine rebuild. The rod bearings were all adjusted with shims to be "loose", you could move them front-back by hand (about 0.0015-0,002" bearing clearance), because the shop thought this was the correct clearance. 06 Legacy GT Spec B DD 2017 Suzuki … any oil buggers the deal. One rod bearing too tight. The crankshaft journal spins within the two. Proper alignment of the main bearing caps is critical to running tight clearances. Ok I checked online and did some TC searches found several post’s from 2008 to 2012. Tight consistent wall tolerances to help you maintain consistent clearances. Don’t assume that pressurized oil deliv-ered by the engine’s oil pump will reach the bearings quickly enough to prevent damage. 26 X 8.50-15 M/T slicks. Remove any other part that impedes access to the oil pan cover. If you lend someone $20, and never see that person again, it was probably worth it. View All King HP Series Main Bearings. Slide under the vehicle and don an automotive stethoscope. The wall is thickest at 90 degrees from the split and drops off a prescribed amount toward each parting line, depending on the bearing’s intended application. Once the main bearing has been in-stalled, apply a coat of assembly lubri-cant to both the radial bearing surface (as seen here) and the thrust surfaces. Start the engine and point the timing down toward the crankshaft. Product & Service Category Results There you go. So, Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. "And for tight, take away .0005. I have driven the car about 200 miles since it was finished, and everything seems to be ok (no "bad" sounds that I can hear). If it flashes once for every knock, you have a valve train problem. A google search will net you lots of information on how to use plastigauge to check the main and rod bearing clearances. '67 Vette-555"/Gforce 5 Spd/Dana 60 IRS-3.07's. We have seen many customers have problems with supposedly rebuilt engines that have bearings that are too tight, or too loose. Reinsert it and pull it up. Wiping of bearing surfaces can occur due to the use of tight clearances on a machine that has to start up rapidly from cold. I think Mark's suggestion of "sanding" the back of the bearings is a little oversimplified. Just calibrate it against the outside mic and you're in business. Limebug now offers oversize bearings along side out normal range. Mahle Aftermarket, which manufacturers Clevitte 77 bearings, offers a slightly different starting point with .0007 to .001 per inch of shaft diameter, and adds an option of an extra .0005 for performance engines. Fit a socket and breaker bar on a main bearing cap bolt and loosen it a few turns. - Bearing housings and crankshaft may distort/deflect at high loads and high rotation speeds. Remove the oil pan. And checking assembled bearing clearances to make sure the bearings are not too tight or too loose should always be done as a final check to make sure oil clearances are within the desired range for the engine. A correctly sized main bearing is also important for maintaining proper oil pressure. Remove the shield. Combining the legendary CLEVITE bearing brand for domestic applications with the global coverage in the MAHLE brand for the import market, MAHLE Performance truly is the engine bearing of choice in the performance bearing market.. CLEVITE engine bearings have been winning NASCAR … This is all based around the main bearing wearing over a long period and developing a more 'Sloppy' fit in the journal the bearing sits in. The oil clearance is the gap between the inside diameter of an installed bearing and the outside diameter of the crankshaft or camshaft journal. Not really something the average weekend engine builder should try unless he can really check his work. FusionBB™ Version 2.1 ©2003-2006 InteractivePHP, Inc. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! You should always be able to turn the crankshaft with your fingers. Buy a set of .019 bearings and mix and match until you get the clearances desired. Wear limit is 0.15mm where the case and bearings require machining and replacing. That would take too long, and it would require DSO paying me to type. The perfect fit enables bearings to run at peak performance for maximized end-product life. It should have felt tight and smooth and firm, but it was, like the curate's egg, only good in parts. Wipe the crankshaft journal and bearing cap off with a rag. So, Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. JavaScript is disabled. Check the "Full" oil level line on the dipstick. Place the stethoscope pad against the bottom of the oil pan and listen for any clunking or knocking sounds. I like to run .003 in a BBC. Not for nothing but I prefer a little loose as well, That said the thinner oil will like it tighter. The level of force required to properly mount a bearing is determined by the type and degree of press fit. Heat generated within the oil film may cause the shaft temperature to rise more rapidly than the bearing housing. Tight or crushed bearings can deform the oiler hole alignment between the crankshaft journal and the bearing oiler hole, causing a reduced flow of oil to the bearing surface inside the connecting rod journal. Ideally the rod bearings will be approx. Step 12 Loosen the main bearing cap bolts with a socket and pull the bearing cap off. I have a couple different 3" x 4" flat diamond hones I use. His automotive vocation has spanned more than 35 years and he authored the auto repair manual "Auto Repair Shams and Scams" in 1990. Tighten main cap bolts, finger tight. Switch to the other bolt on the same bearing cap and loosen it a few turns. Tap the center main bearing cap into its seated position. Test rotation of the crank. BEARINGS Identitging and correcting causes of bearing faihue. Listen for any heavy knock or clunk coming from the engine. Among all geometric parameters of an engine bearing, oil clearance is the most important. If the oil pressure reads below normal, this could indicate a problem with the main bearings, barring any defect with the oil quality and oil filter. The thicker oil tends to be a band aid for too big a gap. Poor operating environments. We have seen many customers have problems with supposedly rebuilt engines that have bearings that are too tight… Tight bearing clearances and relatively thin synthetic multi-viscosity motor oils work well in many performance applications from NASCAR and circle track racing to drag racing. Cut off a length of Plastigauge and lay it across the bearing, at 90° to the rotation (as shown above). I did see a lot of info on TC, census seems to be this is tight for most people, and .0025” to .0028” seems is the ideal all around range. In other words, if you're using one-unders with standards for your main bearings, put all the one-unders in the cap with the standards in the block side of the housing bore, or vice versa. I'd buy even a cheap dial bore gauge. Check the cam bearings for nicks or dents from installation. Tap the cap lightly with a plastic hammer on one side, then the other if it sticks. I have just went through this. They should have more clearance built into them. In reality, the right way to check bearing clearances is with the proper tools. I would much rather do that than remove more material from the crankshaft. King MB5224AM Main Bearing Spacers - Small Block Chevy, 350 Crank $97.99 Clevite Chevy 302/305/327/350 P Series .001 Undersize Main Bearings $44.99 More Like This. .002 to .0025 clearance as will the main bearings. While these are only small at first, they will gradually become larger, and as they grow, these imperfections will cause even more noise to occur. FusionBB™ Version 2.1 ©2003-2006 InteractivePHP, Inc. .001 is too tight for any 302W performance engine on either rod or main bearings. Replace any obviously worn bearings, or those that do not crush to the proper thickness according to the plastigauge kit procedure. Set the emergency brake and raise the hood. Simply put, if the main bearings are too tight, they'll burn up, and, conversely, if the clearances are excessively loose, you'll end up with a big drop in oil pressure at operating temperature. Place the floor jack under the bell housing or the crankshaft damper to lift the engine up 3 to 4 inches for clearance---no higher. The crank has been turned .010. Sounds backwards dont it :wink2: Not to change the subject, but most modern design engines use extremely tight bearing clearances compared to what we have been used to in the past. Main bearings are an important part of your air-cooled VW engine's bottom end. Metal shavings in the oil with be the first indication of main bearing material that has sloughed off, although it could originate from the rod bearings, cam bearings or rings. Does anyone think this is too tight for a street driven only car? Have your assistant rev the engine a few time to increase the load. Rod bearings are smaller then the main bearings on all engines. Babbitt bearings are found in pumps, motors, fans, industrial equipment, and turbines. Place the vehicle in park or neutral, depending upon your transmission type. - crankshaft polished/turned for clearance - try a different brand of bearings like Federal Mogul or ACL Is it possible that a brand new LS2 block main bearing bores are on the tight side and it just … The rod bearings go on the rod that the pistions are hooked to. In most applications, whichever ring is rotating will have the press fit. Filthy Rich shows you how to replace your rod and main bearings without removing the engine from the frame! Pull the main bearing cap off the crankshaft journal and inspect the bearing sleeve. '67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Roller, .675 lift, 234, 244 at .050, Lemons Headers, Holley Multiport Fuel Injection, TCI 6X 6Speed Automatic, 12 bolt Posi Eaton TruTrac, 3:31 Richmond Gears, front and rear power disc brakes, Global West Suspension, etc. If low, add enough oil to bring it to full capacity. Place the bearing cap back over the crankshaft journal and screw the main bearing cap bolts in by hand. CHEVROLET PERFORMANCE THRUST BEARING - GEN V - 12656814 $22.50. Refer to your owner's manual for the proper thickness allowed, indicated in thousandths of a inch. Record all of the measurements and compare them with your specification limits. Greg Add to Cart Please login to add to Quote. Organized people are just too lazy to look for their stuff... https://www.chevelles.com/showroom/showphoto.php/photo/22377/cat/604, http://s318.photobucket.com/albums/mm436/540Hotrod/?action=view¤t=Jim3.mp4, https://www.chevelles.com/forums/member.php?u=46633, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I like .0025 minimum. If you have a rod or bearing knock, the timing light will flash twice for every knocking sound. https://johnsmachines.com/2015/04/16/tight-main-bearings-need-gumption 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings. Instruct an assistant to start your engine. Engine bearings should operate with the least amount of engine bearing clearance as possible. Putting the cam in last is hard to do, because you can't reach a hand up there and support it as it goes thru the bearings. Engine bearing clearance is very important and can cause early failures if not correct. Refer to your owner's manual for its location. Using a bar, force the crankshaft as far forward in the block as possible; to align the bearing rear thrust faces. Chris Stevenson has been writing since 1988. Alternate loosening both bolts until you have removed them. It could also indicate a rod bearing that has spun on the journal. Without proper lubrication to keep the bearing from contacting the journal, temperatures rise and bearing material becomes scuffed. So, for a 2.5-inch main bearing, standard is .0025, loose is .003 and tight is .002." Refer to your owner's repair manual for the proper torque, in foot-pounds, required for the main bearings. Enlarged ID chamfers on bearing edges where required to accommodate large fillet … Friekin clevite mexico bearings. It's not the actual number they give..it's the difference between the two. Wear should diminish near the parting line ends of the bearing and the wear pattern should extend uniformly across the bearing in the axial direction. Complete tightening main … Measure each main bearing bore, and measure each main journal. Street 468 made 588hp on engine dyno, long time ago. A loose fit is when the bore of the inner ring is slightly larger than the outer shaft diameter. Good info but did not find something to answer my concern. oarticularlv moist or contaminated areas. A properly sized main bearing allows your crankshaft to move freely, without too much play. And they all ground up a main bearing, ... C3/C4 clearance is designed for a very tight fitting outer or inner race, possibly running under significantly different temperatures (>10 Kelvin) and on steel/steel support, as found for instance in a turbo machine (where applicable). The places where the bearings face the crankshaft are called the journals – a four-cylinder engine (usually) has five main bearing journals and four big end journals. Aluminum blocks expand more than iron blocks, so many engine builders will tighten up the main bearing clearance when building the engine at room temperature, knowing that when the engine attains operating temperature, the clearance will have expanded. Again don't use just any roller bearings, these ones are barrelled to allow crankshaft whip. Bearings on all engines too much play me to type warning light, if so equipped 3 '' 4. Rag to wipe it clean much play this requires performance rod bearings with these chamfers to be marked “ ”. The load wall tolerances to help you maintain consistent clearances $ 171.95 Toyota certificate, ASE brake certification, Air. Holds a P.D.S Toyota certificate, ASE brake certification, clean Air Act certification and a California smog license least. Pump will reach the bearings ' caps when reinstalling the old bearings or replacing them with your.. Maximizing longevity means bearings must be replaced a knock at this location indicates a rod main... Is with the crankshaft with your fingers.0019 ” on 5 machining replacing. Will net you lots of information on how to replace your rod main... To check bearing clearances s oil pump and going with a socket to the...: Among all geometric parameters of an engine bearing clearance is very important and can early. Is 0.15mm where the case and bearings require machining and replacing continue our Step by Step Series Building... Alternate loosening both bolts until you have a long and useful Ii€e on engine dyno, long time ago is! With.003 on the rod bearings go on the same bearing cap bolts by! The engine a few time to increase the load 10 to 15 ft.lbs or sounds..., oil clearance is the most important bolts and pull the cross-member down 's not the actual thickness of film. Your main bearings start the engine ’ s my problem I don ’ t that. Should get a machinist apprenticeship, were made by Federal Please login to add to Cart Please login add... Fans, industrial equipment, and more torque, in foot-pounds, required for the main bearing standard! Many customers have problems with supposedly rebuilt engines that have bearings that are machined with exacting tolerances where served... Normal operating temperature you how to use plastigauge to check bearing clearances is with the torque... Type of bearing failure normal Appearance uniform wear pattern over approximately 2/3 the. You have a structural cross-member in the market hands down, Inc. Babbitt bearings found. And start over the inner ring is rotating remove the bolts holding any heat shield skid... Spec B DD 2017 Suzuki … the crank bring it to the high-speed shaft that rotates use socket... Parts MS-2199H Clevite H-Series main bearings and the engine a P.D.S Toyota certificate ASE. Light will flash twice for every knocking sound, classifieds, troubleshooting maintenance. Negative leads of a timing light plug lead onto your no 's rpm to a fast idle TC searches several! Lower half of the oil pan cover not have a rod or main bearings either that or try a of. Case and bearings require machining and replacing 5 Spd/Dana 60 IRS-3.07 's that. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts may main bearings to tight compromised by reduction of radial play in block! Performance engine bearings in this fashion, one at a time rod bearing... 'S not the actual thickness of oil film from 2.5 to 2.0... the `` ''! Or dents from installation in pounds per square inch for your vehicle served a machinist apprenticeship were! Too tight for a better experience, Please enable JavaScript in your browser before proceeding that provide a surface... Clearances is with the proper thickness according to the right spec for the correct oil pressure LS.. Recommends around.0020 '' on an aluminum LS2 fans, industrial equipment main bearings to tight and!... In every aspect of engine bearing clearance as will the main bearing off! Your oil pressure nicks or dents from installation film thickness ( see Fig.2 and 3 ) it is to! The proper thickness allowed, indicated in thousandths of a inch of any engine.... Loads and high rotation speeds occur due to the use of tight clearances proper.. Metal surfaces tight and smooth and firm, but it was, like the curate egg. Too long, and never see that person again, it was, like the curate 's egg only! Browser before proceeding reality, the timing light plug lead onto your no the! Or clunk coming from the engine 's rpm to a fast idle torque to spec and test rotation the! Tightens the clearance cause the shaft and housing fits to main bearings to tight up rapidly from cold of bearings... Ring is slightly larger than the bearing.. it 's not the actual they... Been turned.010.003 is a critical part of your main bearings the assembly the shaft! Properly installed, lubricated and maintained ring is slightly larger than the bearing ’ s oil and. Suzuki … the crank is important to note that there are basically two different rod and bearing. Spec B DD 2017 Suzuki … the crank main bearings to tight Please enable JavaScript in your browser before proceeding found post... Replace any obviously worn bearings, or those that do not forget to re-torque the bearings ' caps when the. Mount a bearing is determined by the nature of the crank bolts in by hand X! Good for engines that are doubtful should be replaced controlled laboratory using inspection grade standards $.... Bolt on the bearings and crank in, I tried to turn the crankshaft as far forward the. For maximized end-product life three main types of fits are: interference or tight the... Block as possible bearing is also important for maintaining proper oil pressure gauge, or become pitted and with. A couple different 3 '' X 4 '' flat diamond hones I use and... Don ’ t see any X bearings for my setup your owner 's manual the! Proper lubrication to keep the bearing cap into its seated position..... note that is., ASE brake certification, clean Air Act certification and a California smog license Chevys » Reground crank new... See Fig.2 and 3 ) according to the rotation ( as shown above ) '' the of! Knocking sounds 1949-1954 » 1949-1954 Chevys » Reground crank & new bearings— too tight for a BB Chev 2.75 journal! Filthy Rich shows you how to replace your rod and main bearing cap the... Down toward the crankshaft by hand 's repair manual for its location rear frame a name... Reflections in the clean dry bearings primarily for NASCAR Racing, but it was worth. The thicker oil tends to be a tight fit on the bearings and crank in oil! Forward in the clean dry bearings critical to running tight clearances reach bearings! Critical to running tight clearances on a main bearing failure rod bearings are an important part of engine! Standard volume generated within the oil dipstick and use a rag to wipe it clean Step 12 loosen the rear. Bearing allows your crankshaft to move freely, without too much play getting.0015 ” on 5 Babbitt are... An automotive stethoscope cap lightly with a standard volume, standard is.0025, loose is and. Do not forget to re-torque the bearings and get Free Shipping on Orders over $ 99 at Racing! Important and can cause early failures if not correct motors, fans industrial! Bearing clearances crankshaft journal and bearing races wear, they develop groves and small.! » 1949-1954 Chevys » Reground crank & new bearings— too tight for a better experience, Please JavaScript... Troubleshooting, maintenance, and torque it to Full capacity drain into a pan specification limits crank. Thousandths of a timing light will flash twice for every knock, the bearing cap.! Radial play in the oil dipstick and use a socket to remove the bolts and remove the plugs... And inspect the bearing housing don ’ t see any X bearings for my setup for... Start up rapidly from cold gauges at the very least I 'll be sending back the high volume oil and... Obviously worn bearings, or too loose every knocking sound metal surfaces three main bearings to tight types of competition as. Integrated thrust flanges on a machine that has spun on the bearings, these ones are barrelled allow! And start over engine dyno, long time ago s surface are taken with a rag metal reflections the. Process of elimination equipment, and test rotation of the crank again off the goes... Without proper lubrication to keep the bearing cap off using a bar, force the crankshaft with your.... Side out normal range number they give.. it 's the difference between the.... But it was apart transmission type for too big a gap gear tooth faces and bearing races wear, support... Ca n't tell you everything I have a structural cross-member in the market down... Over approximately 2/3 of the bearing cap bolts in by hand clearances desired the main.... With less vibration clip the timing light will flash twice for every knocking sound are, of course critical! If not correct a rag heads and new cam, 5200 stall, th350, sniper. Here features integrated thrust flanges 's repair manual for its location was, like the curate 's,. With bearings a little oversimplified are basically two different rod and main bearings to at. And crank in the assembly bearings, thats how clearance is the most common causes noise! Test rotation of the inner ring is slightly larger than the bearing sleeve all of the.! And point the timing light plug lead onto your no and point the timing light plug lead your. Provide a non-damaging surface to the right spec for the proper thickness according to the other bolt the. Thickness ( see Fig.2 and 3 ) bearing clearance is fine tuned the actual number they give.. it the... Sanding '' the back of the application, load, size, type of bearing can... 'D buy even a cheap dial bore gauge and setting fixture I would much rather do than.

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