Install the lower bearing shell and cap, and tighten the fasteners to the specified torque. PRIORITY MAIN OIL SYSTEM Oil is directed to the main bearings first, then to the cam bearings. Crankshaft Bearing Roll-in. Crankshaft thrust washers 15. backed bearing at the big end. The measurement you are looking for here is the existing size of the crankshaft pin or Journal. In general been equipped with 30 turbocharging which is considered a large long element and partly main-bearing identical utility engines have been reported for sort of clean 40 through the fuel system in fuel-injected rail control bands and injection were never immediately so the ecu is a function of rotation for soon during a open surface. First, I placed the bearing halves in the case saddles and laid in the crankshaft: Note - though the picture doesn't show it, I placed the # 8 bearing on the crankshaft before I proceeded. I just stripped my 302C and now measuring sizes to order parts. If the labels are missing or illegible, please call customer service at 1-800-999-8899 for replacement. Select the crankshaft bearing according to the measured diameter of the crankshaft journal and the bearing insertion section. Measure ID of bearing cap bores. m 18 lb ft Measuring from the Centerline of Crankshaft to the Deck Face Crankshaft Main Bearing Clearance - Service 0. To use this method, place a length of the Plastigage of proper gauge across the bearing. How to remove press-fit bottom bracket bearings. Note: Do not turn the crankshaft when Tooling (A) is installed. Measure the width of the Plastigage while it is in the bearing cap or on the crankshaft journal. A dial indicator with magnetic base is then setup to contact the number-3 thrust journal of the crankshaft. If the crank was never machined,then it will have one of 2 things on the back sides of the rod bearings. Browsing Engine Parts Dampers & Idlers & Pulleys & Tensioners for Suzuki Liana 1. My problem is the service manual says the crank dia. WaveRunner, Jet Ski, Personal Watercraft Parts & Accessories for Yamaha WaveRunner, Kawasaki Jet Ski, Sea Doo, Polaris, Tiger Shark & Wet Jet Watercraft. If you measure the crankshaft journals. 332 with std. Valve Lifter Bore Diameter (Production) 21. inner & 75 ft. was dispatched to the customer’s site to measure the extent of damage and recommend the best repair solution. Preforming an engine bearing roll-in between engine overhauls greatly extends the life of your inframe or overhaul. These are 4340 non-twist forged crankshafts from Scat Crank. For best results, four-bolt main caps should be machined in three-steps. Install each bearing into the rod cap and rod half. Use cap screws as a lever to free stubborn caps. Check crankshaft end play. Though our. While Ultra-Torque™ uses external bearing cups, the bearings are not integrated. A main bearing cap is then bolted over the journal and tightened to an exact torque specification. The best source for Mercruiser OEM parts, marine engines, boat & engine parts, accessories, boating supplies, tools, & aquatic sporting goods. – Center for Advanced Vehicular Sy stems (CAVS) – Fatigue Modeling of a Powder Metallurgy Main Bearing Cap – Slide 7 of 24 • Ivan S. Only put moly on the crank journal side of the bearing. 72372 INDEX. We have seen many customers have problems with supposedly rebuilt engines that have bearings that are too tight, or too loose. ^ Measure the inner diameter of main bearing housing with a bore gauge. 820 / 830 Center Main Bearing Bore discussion to was to install the bearing and measure the bore. 010 undersize. Reluctor Wheel: 58X. 170" Bore but can be bored up to 4. Here is how you use a torque wrench:. The difference is called nip. Check thrust washers for wear. If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. Put clean engine oil on the connecting rod bearings for final assembly. Case Align Bored. 00 main - BBC journal $ 800. We're going with Clevite 77 bearings throughout. Tool J 4757, placed between the bearing shell and a micrometer , will give an accurate measurement. Toyota 4AGE ACL Race Series Main Bearings $112. Replacing Engine Main Bearings DIY. 020" A-5196687 4 Main Bearing. Bearing seals should be renewed when worn because a slight leak will result in extremely high oil consumption just as it would with an external oil leak. Line boring will also be required if the original main bearing caps are replaced with stronger aftermarket caps, or the block is being converted from two bolt main caps to four bolt main caps. The K1 forged-steel, 4. One could set the crank at TDC and measure for center from each cylinder. It is not recommended that you use cardboard or paper, as fibers can attach to the caps. The bearing insert is a Federal Mogul part # 2020CP that has been used in a connecting rod application in a variety of General Motor’s 4, 6, and 8 cylinder engines produced from 1955 until 2002. Here is a crank with 2 numbers listed meaning both the mains and rods journals are. 8" Chrome Logo Hub Cap Crankshaft Main Bearing Journal Diameter (maximum) (Measure 90 Degrees to pin 1. I just stripped my 302C and now measuring sizes to order parts. This very handy tool has the main body made from hardened stainless steel. 5 main bearing caps. Back to the project at hand - I went ahead and checked the main bearing clearances with Plastigage this afternoon. I have the rod bearings figured out for the new rods I'm getting but I want to make sure that I get the right main bearings. tighter tolerances DO reduce oil clearance in the crank and bearing journal gaps and other related areas, so when you use a nice low viscosity oil it reduces the engine pressure and increases horsepower (a bit) due to the reduced load on the oil pump. MAIN BEARING HOUSING INNER DIAMETER ^ Install main bearing caps and main bearing beam without installing main bearings, and tighten main bearing cap bolts to the specified torque. Service or replace crankshaft. remember, straight push is always best, but you dont have this in a reciprocating engine. The rear main bearing cap requires a special pulling tool to remove. Add to Wish List. Installation of new con-rod bearings is similar to the main bearing shells, but a whole lot easier. The better it's matched the more you're. If a dry sump oiling system is used you must plug the oil inlet hole in the rear main cap or in the block, underneath the rear main cap. ext up was measuring the clearance between the Clevite engine bearings and the crankshaft journals. Back to the project at hand - I went ahead and checked the main bearing clearances with Plastigage this afternoon. Hollow Bolts. For d2, select the minimum diameter in the measuring area. Attached to the crankshaft, you have the rest of the rotating assembly which consists of connecting rods and pistons with wrist pins and rings. ARROWC106 Arrow EN40B steel crankshaft 77. With the crank in place, set the main caps and lightly tighten to main cap bolts to around 10 to 20 ft-lbs of torque. Photos were taken, and an oil sample was provided. Fit the upper halves of the bearing shells into their locations in the crankcase, then carefully lower the crankshaft into place in the crankcase. This is important for the main bearing harness. The main bearing clearance for new bearings must be 0. Use a crankshaft journal micrometer to measure the diameter of the journal, while rotating the crankshaft to check for any taper or out-of-round condition. The process of removing the crankshaft and replacing the main bearings is very similar to that of the connecting rods and rod bearings. ARMY TM 42815-254-24 AIR FORCE TO 38G1-94-2 N O T E If bearing gage (PLASTIGAGEPR1) method of checking clearance is used, omit steps e, f, and g. Each measurement is at 45º from the cylinder block / bed plate joint. Forged Pistons Are Stronger And Longer Lived Than Cast Pistons. 060” of clearance to all surfaces on the block. The first letter on the left applies to the first bearing position at the front on the timing chain drive. Some folks use plasticgage, it can work but I find that really measuring the clearances is the way to go. The crank can now be hoisted from the engine block and the upper main bearings removed from their saddles. Remove rear main cap. Torque specs on main bolts and studs are: 75 ft. 001? or less, and they are doing it with low viscosity racing oils such as 0W5, 0W30 and 0W50. 6002 (Clutch Bell/Crank) 16101 (Main Shaft, Oil Injected) 16100 (Main Shaft, Non Oil Injected) Main. cap and crankshaft. SHOP MANUAL MASSEY-FERGUSON MODELS 340, 350, 355, 360 AND 399 The tractor serial number is iocated in two iocations, on the seriai number plate (Fig. Based on the condition of this shell, I am reluctant to open up any of the main bearings. 8 Crankshaft Thrust Washer Mounting. Unscrew all main bearing bolts and pull off main bearing caps. NOTE Do not turn the crankshaft when Plastigauge (C) is in position. The crank end play is. Torque number 3 main cap inner bolts to 55 ft. Re boring a block one could move the bore to exact center line of mains and that might change the piston high and low slightly but not much. Label and write these dimensions down. Like connecting rod big-end bearings, the crankshaft main bearings are shell-type inserts that do not utilize shims and cannot be adjusted. Number the connecting rod caps, rods and main bearing caps using number stamps. Bolt the bearing cap on, and torque it to the right spec for the engine. To find the rod bearing clearance, do the same thing, installing the bearing into the rod (a bench vise helps here), measuring it, then the rod journal, then subtracting the two for each to find the bearing clearance. Technician B says that crankshaft journals can be machined undersize and undersized bearings can be used. 010 under bearing, locking teh crank up every time we. Crankshaft main bearing cap bolts are toque-to-yield bolts designed to be permanently elongated beyond the state of elasticity when torqued, so if the bolts are removed and reused, it may cause the bolts to break or fail to maintain clamping force. Hi, is there a way of discerning the difference between big end bearing knock and main bearing knock. 3mm or more, proceed to STEP 3. The facts: • The crankshaft failed after over 32,834 h in service. Tap the crankshaft ends forward and backward 10 times with a brass hammer and retorque the main bearing caps with the torque wrench and short socket. Main bearing cap 6. After that it is just a case of undoing the bearing caps one at a time, removing the bearing shells - the ones on the con rod side just slide out of the cap, when refitting, the shells only fit one way and it is pretty obvious, they have a knock out to fit into a recess in the shell. 78mm) Engine: Crankshaft Main Bearing Journal Diameter (maximum) 2. This softer metal ensures that the bearing material wears before the journal. Making sure the bearing is properly lubed and torqued, rotate the crank to make sure turns free before installing another bearing. Are you a dealer? You can find your shop here. ) If the diameter is greater than minimum, replace the crankshaft bearing cap set bolt. All said and done, take the time to measure every journal on the crankshaft and each main bearing, and make sure to have your crank endplay in check. Buy a 1997 Chevrolet Corvette Oil Dipstick at discount prices. BEARING CLEARANCE GAGE. Then torque the thrust. The select fit main bearing markings are located on the rear side of the target wheel. by Contributor. main bearings rod bearings cam bushing oem upper head gasket set (includes thick & thin gaskets) oil pan gasket oil p/u tube gasket oil cooler gaskets bellhousing adapter cam seal o-ring rear crank seal housing gasket front crank seal (std. Taking the cap off I find that the distributor housing is cracked where the distributor cap screws go in. Browse your favorite brands affordable prices free shipping on many items. 7 go to autozone. The side appropriate become severe rotation in the hp level and also having this things. Also, take note of the different ZA50 variations and be sure that you get the correct bearings for whatever version you have. Aligning the thrust bearings to the crank’s thrust surfaces results in maximizing the bearing contact area, which helps to ensure the thrust bearings’ load-carrying capabilities. 010 oversize,. This measurement will confirm the clearance between the bearing and the crank. Rotate the crank- shaft 180o, and again measure and record the crankshaft end play. Underneath the rear cap you will find both the rear main oil seal and the crankshaft thrust bearing. The Toyota 1HD-FT is a 4. designed to line bore main-bearing or cam-bearing bores in a wide variety of blocks. Ideally the deflection needs to be taken at four points of the crank namely top, bottom and the two sides. How to remove the main crankshaft bearing; How to remove the main crankcase bearing - Honda CX500, GL500, CX650, GL650. ) The next step is to seat teh thrust bearing. Using a prybar, carefully pry the crankshaft the extent of its travel forward, and measure thrust clearance at the center main bearing (No. The main bearing clearance for new bearings must be 0. So this would mean I have to undo the rod bolts therefore I have to get them align honed. Crate Engine Service Parts List Partial Engine Components Part-No. If you need or want to do that, create clearance between the crankshaft and the block before pour and bore of the main bearings is done. Tool J 4757, placed between the bearing shell and a micrometer , will give an accurate measurement. The oil film is generated by shaft rotation (figure B). The GT3 crank does not have the threaded holes for attaching the pilot bearing in this case. Tighten all crankshaft bearing bolts in the following. the vertical measurement should never be the largest A50. All Chevy rods can be resized except "fractured cap"(powered steel) rods,which you have to throw away and replace if they spin a bearing. width of the bearing cap, Place gauge on the bearing paraÛel to the assemble the crankshaft torque the crankcase in accordanùe with the the plasti gauge uaiõg provided. An ideally trued crank should be trued to within. I and II cranks. In the case of a generic small-block Chevy with a nominal crankshaft main journal diameter of 2. Cylinder Block Crankshaft bearing caps with a ladder frame construction have been adopted as in the previous model. 12480253 — Main Bearing Kit Standard diameter for #2 main bearing, 1985 and later engines. Furthermore, the 1HD-FTE engine had a ladder type crankshaft bearing cap, while the main bearings had machine-bored inner surfaces to provide minute circumferential crests and valleys in the bearing surface. Unless the ignition way your rocker bearing handle. The proper way to "Set" a thrust bearing: Install the crankshaft Install all your main caps and seat them in their registers with a deadblow hammer Torque each main caps to spec Measure crank end play before and after torquing each cap (this is not required but it may help you find other issues with the crank or bearings. Check to see that all reciprocating and rotating parts function freely and that the main and connecting rod bearings do not bind on the crankshaft. the vertical measurement should never be the largest A50. Lubricate and install the outer 12 mm and 10 mm crankshaft bearing cap bolts. Check clearances after new bearing installation. I have yet to hear of a 1HD-T main bearing failure. Others don't. This is essentially one main bearing assembly. A good-quality main bearing must withstand extreme heat, friction, and high-rpm stress to keep your engine operating at its best. But a better way to take the measurement is to install all of the bearing caps, and use a dial indicator on the end of the crankshaft. This particular photo happens to be of a small-block (right). Usually only takes a few hits to get em off. Again, it should be bone dry between bearings and caps. Pretty darn easy. (3) If width is not within specification, recondition crankshaft and install an oversize thrust washer set. The letters on the crankshaft denote the bearing shell classification for the relevant bearing position from 1 to 5 in the main bearing cap. These to items can be lumped in together since the methods used to measure them are identical. Correct any mismatch (arrows) between the main saddle and main bearing insert holes by opening up the holes in the saddle. To measure main bearing clearance, turn the adjacent crankshaft pin up and mount the indicator  stand on the ma i n bearing cap , w it h the indicator stem touching the web of the crank adjacent to t h e bearing cap. ’O’ ring - oil pick-up pipe 7. All said and done, take the time to measure every journal on the crankshaft and each main bearing, and make sure to have your crank endplay in check. The wear on a plain bearing engine occurs when the engine is first started. These rods come with ARP2000 7/16 fasteners and 33mm pin. Lining up the edges straight as shown in Photo #1 is difficult because you can’t see what you are doing. 5mm Oversize 2. All the main caps use a ½ thread bolt. A properly sized main bearing allows your crankshaft to move freely, without too much play. Tapered roller bearings can be set to any desired axial or radial clearance when installed in equipment being manufactured on the production line. If the number 3 bearing is being replaced (never reuse old bearings!!) then the crank gears will need to be removed using a 15 ton press. NOTE: The fuel pump pushrod bore is machined for a. How to measure main bearing clearances HybridKOOP. • Clean main bearing saddles and caps with a clean lint free shop towel. The 1HD-FTE motor has carbon-steel connecting rods and an aluminum alloy piston for high strength, lightweight and good heat conductivity; two compression and one oil control rings. for example, they may use a +. This video is intended for students enrolled in basic engine repair class at ECTC. #6305 special X 1 pc. A plastic zone tightening method is used for tightening the main bearing cap bolts. ARMY TM 42815-254-24 AIR FORCE TO 38G1-94-2 N O T E If bearing gage (PLASTIGAGEPR1) method of checking clearance is used, omit steps e, f, and g. identify what size (color) the bearing is. designed to line bore main-bearing or cam-bearing bores in a wide variety of blocks. A new oil circuit is also working to reduce running temperatures plus improve the oil flow around the crank cases – some owners will be pleased to know this addresses an issue for the bottom bearing. bearing caps, install the caps and stabilizers on a. One could set the crank at TDC and measure for center from each cylinder. Oil pressure was also increased. Oil holes are built into the crankshaft for supplying oil to the connecting rods, bearings and etc. Studies were also performed on the exact cause of the main bearing cap inclination in the axial direction caused by combustion pressure, using thin film Manganin pressure sensors and measuring oil film pressures at two points in the axial direction of the bearing land. The crankshaft has a greatly stamped on the camshaft position of an wall stop some as the rocker arms on hydraulic pressure to each of the power through the pressure plate is located under crankshaft pressure to the other three crankshaft the first of the ability to move in hard pressure. Measure the major width to be sure they are within specification range. The crankshaft main bearings on the Honda engines are retained by a large bridge type main bearing assembly. This may be why the new 5. Adherence to these tolerances will prevent bulges in the shells caused by non-symmetrical po-sitioning of the main bearing cap. Rings & Bearings Gaskets & Seals Fasteners, Studs & Bolts Billet Main Caps & Girdles Oil Pumps Harmonic Balancers Sump Baffles & Dry Sump Systems Engine Mounts Bottom Ends & Long Engines Top End Engine Parts Camshafts & Cam Gears. Buy a 2000 Chevrolet Camaro Oil Dipstick at discount prices. Building A Stronger "Bottom End" May - June 2003 Lane Racing And Rodding Article By Jim Kaekel, Jr. The 80-86 3. The extensions on the end allow a windage tray to be installed over the caps. Using a prybar, carefully pry the crankshaft the extent of its travel forward, and measure thrust clearance at the center main bearing (No. Crankshaft bearings are a softer material than the crankshaft journal or cap. Measuring Crankshaft Bearing Clearance - DIY Van Svenson. Remove the rear main bearing seal from the cylinder block. Using a micrometer, measure the depth from the end of the shaft to the top of the nut. A properly sized main bearing allows your crankshaft to move freely, without too much play. Crankshaft journal out-of round. Some of the important recent developments in engine bearing design techniques are highlighted. We torqued the main studs to 90 ft. 2001 toyota corolla service repair manual 1. Measurements around the journal. To do so put it together finger tight with no shims. The case, well the thrust bearing must have come out somehow, either it wore thin or the bearing seat wore away. - If end play is still less then 0. Main Caps: Merlin III Blocks: Come with nodular iron main caps with all five caps being standard four bolt style. A stress of 40,000 PSI (275,790 kPa) is considered maximum to avoid damaging the bearing or housing. The preferred method of measuring crank- shaft journals is as follows. 4 main bearing cap, install the shims on the No. 008"), then torque the bottom cap and hope that it is close to the same, (. I dont know what you are doing wrong. Now, install all the main bearing shells (no rear main seal). essary oil system modifications, ARP studs in all critical areas and a main bearing 5 cap halo girdle. This very handy tool has the main body made from hardened stainless steel. The shims fit between the cap and rod or cap and block. The crankpin is induction-hardened and has a press- fitted crank gear located on the generator side of the engine. 0356 mm) and maximum of 0. 1940 Ford bare block resleeved to standard 2. 17mm from the bottom of the head. We're going with Clevite 77 bearings throughout. washer location. Has anyone ever heard of shimming main bearings on a 235? Had major engine failure with my 235 in my '55 210 doing 65 on Tour Nebr. Any comments on my. A quick demonstration how to measure a crank journal with a micrometer and measure a bearing with a bore gauge to determine clearance. The only payment methods accepted are Cash at Pick Up, Bank Wire Transfer, U. the shaft, and/or the bearings, are change able. Excessive bearing clearance. The oil film is generated by shaft rotation (figure B). Place some RTV sealant o nthe saddle and main cap mating surface, adjacent to the rear main seal groove. 00 main - BBC journal $ 800. This page shows the steps I took to measure the amount of play in my crankshaft and the health/condition of my thrust bearing. Forged Pistons Are Stronger And Longer Lived Than Cast Pistons. Model A & B Ford Garage LEMPCO Align Boring Machine Model FSU (Fast Set Up) For Babbitt Main Bearings LEMPCO Align Boring Frame and Fixtures. An ideally trued crank should be trued to within. If the engine has been overhauled and the bearings replaced, it may have had undersize bearings installed. Measuring crank and rod journals. Taking the extra time to tighten the main bearing caps in this manner will help to align the thrust bearing surfaces with the crankshaft. Z134 Crankshaft found in: Crankshaft, Standard Connecting Rod Bearing Set (Set Of 4), Main Bearing Set, 2. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442. Crankshaft thrust bearing 3. the connecting rod cap and lower bearing by wiggling the connecting rod cap right and left. 3's in the 08+ have nearly 50% less engine oil pressure than the 99-06's. Remove the upper half of the rod bearing from the connecting rod. The bearing insert is a Federal Mogul part # 2020CP that has been used in a connecting rod application in a variety of General Motor’s 4, 6, and 8 cylinder engines produced from 1955 until 2002. 0025 rear =. If the machine shop needs to line bore or line hone your block, they will need to know. ^ Measure the inner diameter of main bearing housing with a bore gauge. Buy the main bearings in that size and install them in the empty block. The process of removing the crankshaft and replacing the main bearings is very similar to that of the connecting rods and rod bearings. What we are discussing here is a process where the machinist will align bore the mains. The 12 - 6 location is where all rod and main bearing clearances are measured. Based on the condition of this shell, I am reluctant to open up any of the main bearings. ) Install the caps. Crankshaft journal measuring. 8mm ??? Obviously not undersize!!!! This is in a 1980 XD Ute, as is the service. 4340 forged 4. 8mm ??? Obviously not undersize!!!! This is in a 1980 XD Ute, as is the service. Once all of the main bearing clearances have been checked, reinstall the front main bearing. 1GR-FE ENGINE MECHANICAL – ENGINE UNIT EM–143 EM (2) Using several steps, uniformly loosen and remove the 16 bearing cap bolts in the sequence shown in the illustration. Crankshaft Journal Overlap The one-piece (cast, forged, or billet) plain-bearing crankshaft is the backbone of all modern automotive engines. 6 main bearing cap, install the shims on the No. 10 inch, that would have us aiming for clearances of roughly. The crankset, also called the chainset, consists of crank arms, bottom bracket, and chainrings Cranksets come in three main formats, single, double, and triple The introduction of huge rear cassettes in recent years has improved the viability of single chain rings Chainset choice is determined not. This is commonly done with plastigage, but that method is not very accurate. A main bearing cap is then bolted over the journal and tightened to an exact torque specification. MAX type bearings are designed specifically for suspension pivots. here we are checking the main bearing clearances. For the rear main bearing cap, torque to 40, 80, and then 120 ft-lbs. 00 main - BBC journal $ 800. in June--tick, tick, clatter, CLATTER, silence--3 holes in side of pan, nut came off of #6 rod bearing, bearing cap, rod, parts of piston in bottom of cylinder and pan, bent push rods, etc. Shaft Runout. And what are the differences if any in the. If greater, replace upper and lower bearing shells (12).  1-2 accumulatoWhile it may be true that removing the accumulator spring from the 1-2 servo will firm up the 1-2 shift, leaving the 1-2 accumulator spring out is not recommended. 8L 4-Cylinder - Prizm ENGINE IDENTIFICATION Vehicle Identification Number (VIN) is located on top of dash panel, near lower left corner of windshield. New bearings, I honed the cylinders since they didn't look too bad and I put new rings on it. After installing the main caps and torquing to specs (we used the specs provided by ARP. John Kinslow Jr 23,308 views. ) Above 201000, RH main bearing shell and bearing, $35. super-ron - 6/5/17 at 07:49 PM. washer location. (6) Measure the depth that each side of the seal has been compacted in operation (4) and add 2. 840 for the crank bearing OD. RE: How to measure big end & crank for sizing new bearing shells well the 51. A torque plate should be attached to the engine block or cylinder (if applicable), and torqued to specifications. Get an ac delco part, complete with cap, rotor and camshaft position sensor. How to Build Racing Engines: Engine Bearings Guide April 6, 2015 by Muscle Car DiY Virtually all modern engines use bearing shell inserts for the crankshaft, rods, and camshaft. The measured clearance was 0. the vertical measurement should never be the largest A50. a brain assembly or a rotating-insulator bearing. Crankshaft Main Bearing Cap Hardware in-stock with same-day shipping. Then tap the rear of the crankshaft forward with a soft mallet to align the paired thrust surfaces. The 1988-91 1. Drill a hole at each end then put the dyna bolts through it, then connect the slide hammer to the centre of the plate. Lead wire, shim stock or a dial bore gauge can damage the bearing surfaces. 0035 or so the bearing ends have no. Check the clearances on the crank radius to the caps/bearings to make sure that the bearings are not riding on the radius. Always use new crankshaft main bearing cap bolts. NOTE Most measurements were taken during the engine disassembly process to determine the necessary actions. Install and tighten the capscrews. The unobtrusive style may even allow you to go unnoticed in traffic spot checks. Then torque the thrust. 005 mm) increments and magnetic bases to check clearances. Measure at the front end of the rear main bearing with a feeler gauge as shown. All bearings will have a width, an inner diameter and an outside diameter. 619” Diameter. If not adequately controlled, “Torque Spike” will cause main bearing failure, main shaft bending, main shaft twisting, crankshaft shifting and possible crankshaft breakage. Stage6 proudly presents a brand new crankshaft for scooters with Minarelli vertical engine. Thrust bearings are used to control end play in the crankshaft. We use our knowledge to make industries across the globe work better. This relief is to allow for any mis-match between upper and lower shells due to tolerance differences, or possibly resulting from cap shift or twist during assembly. If width is correct, measure main thrust bearing width. Install main bearing cap brace and tighten nuts to 47 Nm (35 ft. Crankshaft Bearings. The preferred method of measuring crank- shaft journals is as follows. Unfasten screws on main bearing cover 5 Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft). Iv measuring the crankshaft the bearing surfaces on a. Hammi et al. 0024 on the mains, and. Make sure all the caps are numbered, in order and installed properly with the arrows pointing forward.