End play is important because it limits the fore and aft movement of the crankshaft in the block. This slight chamfer will pull additional oil onto the loaded (rear) side of the thrust surface which will improve lubrication and reduce the thrust surface temperature. In those courses, you merely disassembled the engine and then reversed the procedure. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. math!!! It is this clearance we will be addressing in this article. We use a 24-inch by 24-inch piece of scrap quarter-inch thick aluminum plate. Starting a cold engine (when most of the oil has drained from this area) with the clutch pedal on the floor places tremendous load on the thrust bearing. If nothing else, if crank endplay is not checked and verified, the end result will be disassembling the entire engine to repair the damage, because too loose is just as bad as too tight. Often, each has blamed the other for the resulting damage. End play is important because it limits the fore and aft movement of the crankshaft in the block. Also make sure the two halves are clamped as they sit in the engine – it’s possible to orient them incorrectly which will not produce the results you desire. It's a 1968 307 that has been bored .030 over. Once the proper main bearing halves were selected, only then can we test for endplay. 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With a completely disassembled engine, the first step in this process is to ensure that the proper main bearings are used. Sanding in a figure-eight motion, we will sand for a minute or so and then check our measurements. With the clutch pedal on the floor, a major portion of the load released by the clutch pedal is directed forward into the crankshaft. We prefer to clamp the two bearings halves together by setting them flush on a flat surface (an aluminum plate for instance) and carefully tightening them with a large hose clamp (left). Different engines demand varying specs. spec for later engines is .0024" to .0076". Just like all other engine clearances, the thrust clearance is critical for proper engine performance. Generally speaking, keeping the thrust clearance at 0.004 to 0.005-inch is appropriate but it is best to check the recommended clearance. To get to the bottom of the issue, the Automotive Transmission Rebuilders Association (ATRA), the Engine Rebuilders Association (AERA), the Production Engine Remanufacturers Association (PERA), the Automotive Service Association (ASA) and bearing manufacturers got together and came up with a list of possible causes and remedies for thrust bearing failures. The motor runs great, no noises or knocks. "After the pinch bolt is loose then While car engines have changed a lot since I did any serious work on one, crank end play sounds like a tapping, metal on metal that get louder as the engine increase or decreases rpm. There’s a simple technique for installing and measuring thrust bearings. If these grinding marks are not completely removed by polishing, they will wipe the oil film from the surface of the thrust bearing much like multiple windshield wiper blades. The key here is to get a difference between 2 Topics: Save my name, email, and website in this browser for the next time I comment. (too move both forward and aft). Crankshafts that are discovered suffering from excessive thrust clearance are rare, assuming no damage has occurred to the crankshaft. If an engine is assembled with too much end play in the crank, or if the thrust bearing fails, the forward movement of the crankshaft in the block can chew up the main bearing caps and block. SIDE NOTE: Besure to check the specs for We used wet/dry 400 grit sandpaper lubed with Marvel Mystery oil. We pry back on crank using a long screwdriver, then zero the dial indicator and then pry the crank lightly forward to read the total clearance. Camshaft end play should be 0.076/0.127 mm (0.003/0.005 in.). How to Calculate and What it Means, How to Clearance Your Block for a Stroker Crankshaft. This sounds simple, but in the case of a recent big-block Chevy, we used 0.010-under bearings for the first four main bearings, and due to a slightly undersized Number Five crank journal, this required a set of Federal-Mogul 0.011-inch-under bearings to set the clearance on Number Five. Checking and setting clearances is all about stacking the longevity odds in your favor. Required fields are marked *. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Oddly enough i came up with the same For years engine and transmission rebuilders have struggled to determine the cause of crankshaft thrust bearing failures. 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