endstream endobj 3736 0 obj <>stream Anyone who knows how to use analogue dial indicators will recognize this method. When should this method be used? A critical measurement of a transmission is its end play. After the bearing is clean, we reinstall the bearing and go through the endplay check another time. Min. Set up a Dial Indicator on the end of the camshaft using a magnetic base. In the case of our big-block Chevy, with its new Number Five thrust bearing, we measured barely 0.002-inch of endplay. Output bearing end play Once the desired overall thrust thickness is achieved, sanding the bearing with a lighter 1,000-grit or 1,500-grit paper can make the surface smoother. Hopefully for the first-timer, the engine started and ran happily and if so, you passed the test. However, as the name suggests, this method means that values are collected from more than three points. This method is very useful in instances where it is difficult to stop the machines to take stationary measuring points, for example, when aligning large turbines. This is because the inclinometers would move in conjunction with the vessel's movements on the waves, potentially corrupting the collected measurement values. This bearing will need to be sanded to add the necessary clearance, and get within the specs. With the Multipoint method, several points around the shaft are registered, which allows the measurement quality to be evaluated. 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. This produces maximum forward thrust on the crankshaft while attempting to start the engine. Just like all other engine clearances, the thrust clearance is critical for proper engine performance. All rights reserved. The rotation of the measurement devices around the shaft is similar to that of a clock; positions 9, 12, 3 and 6. End play is the total distance the shaft can move between the two thrust bearings and is sometimes called float, thrust bearing clearance or axial clearance. I.e. h�212Q0P���w�/�+Q0���L)�612�)��&0�)�ae�����E� 3�Z�C*R�B��vv �3� This method also gives a quality evaluation of the measurement series. The clock method, or 9-12-3 as it is also known, is the origin of all shaft alignment. Continuous sweep is best used when it is difficult to stop the machines to register measurement values. © 2020 Power Automedia. There’s a simple technique for installing and measuring thrust bearings. We used wet/dry 400 grit sandpaper lubed with Marvel Mystery oil. One answer is that this method can always be used when you are able to rotate the shafts freely, and there are no other physical obstructions preventing you measuring from the 9-12-3 positions. The clock method, or 9-12-3 as it is also known, is the origin of all shaft alignment. We also mark the bearing on the side facing the rear so that all our sanding is accomplished on the forward-facing side of the bearing (right). �0E�:�^ҤX�� N�� i��m To measure and adjust end play: Install the Camshaft, timing gear, and any other related components. After the bearing is clean, we reinstall the bearing and go through the endplay check another time. For 10" motors and larger, refer to specific manual for dimensions These dimensions are applicable for Sterling manufactured submersible motors v 01/18 101.5 mm: 0.20 mm 0.50 mm: Motor Size 6" 73.00 mm Dim 'A' Dim 'B' 73.02 mm - 72.88 mm: Sterling Pumps Pty Ltd www.sterlingpumps.com.au T: 03 … This eliminates potentially excessive wear on the thrust bearing. 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In some cases where high loads might cause increased thrust bearing wear, as with constant acceleration/deceleration with road racing or circle track applications, or with drag cars with manual transmissions and high clutch loads, Mahle-Clevite suggests a minor modification to the rear thrust bearing. h��� 5nother proble that can occur with lightly loaded thrust bearings is shaft shuttling! + 6 Example: a 10.5" thrust bearing would require .015" of end play. Checking rear play is easier to manage if the planetary assemblies are left off (Figure 2). The end result is a properly clearanced crankshaft, which ends up being its own reward. This will align the two thrust bearing halves at the rear. 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). Crankshaft endplay never seems to garner the same level of attention as say, rod and main clearance, but even with its somewhat limited attention, this is still a crucial area. Testing thrust clearance requires bearings in at least the Number One and Five journals to properly support the crankshaft. It’s all the checking and clearancing that is essential before the engine is assembled, where all the real effort is located. Note that late-model engines attempt to limit the maximum endplay, because excess crank movement can cause crank sensor errors. Measurement method EasyTurn offers down to 20° between measuring points. Dial Bore Gauge Tested, EngineLabs’ Blueprint Series: The Keys to Proper Block Align Honing. Install a thicker snap ring to decrease the end play. There are a number of different abrasives that can be used. 4n this case" the whole shaft bounces bac6 and forth between the loaded and slac6 thrust bearing! Read more to find out how to use them best! endstream endobj 3734 0 obj <>stream Multipoint is, in turn, a further development of EasyTurn. At the end, the shafts' rotational centre is calculated and presented graphically via images and text. Even if sanding the thrust face is required, the task is not difficult or necessarily time consuming. With all sanding complete, it’s best to remove the stainless steel clamp and then thoroughly clean the bearing halves with alcohol and a lint-free paper towel. }B�˧]NwS�q�j�. From a practical point of view, this means that you can use this method where there is limited possibility of rotating the machines, due to the lack of space around the shafts. This makes crank endplay a spec that cannot be overlooked, and that alone should motivate all but the laziest of engine builders. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! The mathematical assumption is that if we can measure the semicircle, we can then work out what the whole circle will look like, and consequently determine the centre of the circle (rotational centre) for both shafts. 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. The measurement was easy to make (i believe i did it correctly) and i used the following excerpt from an EMAIL of RENNLIST MEMBER who performed the same procedure on his 88s4. Read more here. )�@&����!��RY�����Zlg` P�H Push the camshaft as far back in the block as it will go. This whole process may take ten to twenty minutes or more to complete. endstream endobj 3738 0 obj <>stream Using a rubber mallet, tap the crank forward. endstream endobj 3737 0 obj <>stream With the main cap in place lightly tap the crank from behind to align the two bearing halves. Sanding in a figure-eight motion, we will sand for a minute or so and then check our measurements. 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. We stop and measure every minute or so to check progress. We then use a dial caliper to measure the width of the bearing in several places and mark the widest portion with a Sharpie. Multipoint also means that you can start collecting measurement values from any clock position (angle), and complete collection across as small a rotation as 40 degrees. Most performance thrust bearings are now built with multiple small ramps that change the “height” of the thrust slightly so it’s important to measure in several areas to locate these ramps. So the technique for a car equipped with a Long or Borg & Beck clutch is merely to start the engine in neutral. endstream endobj 3735 0 obj <>stream Each with its own advantages. If thrust bearing wear or damage is an issue, as evidenced from inspecting the old bearing, Mahle-Clevite suggests this minor modification: Locate the rear portion of the main bearing half in the block (upper) and carefully file a 0.040-inch chamfer at the parting line. ���t�p�r�%0�kj�4=�+���Ʀ>N��|J�h]WfXz�q�ř�����b�ӸW��:G��2^@R�lz �P ����X/*��M�ۥ���OA�� L(� Here we describe them individually, so that you know when best to use them. It is based on geometry (and trigonometry), more specifically circle mathematics. The evaluation takes into account shifts in temperature, measurement direction and number of measuring points. At the point of installation of new machinery, there are many things you need to take care of to make sure it gets the right prerequisites to run smoothly for the extent of its life span. Automatics are often blamed for burnt thrust bearings due to converter ballooning (expansion of the converter), and this does occur, but there are other causes. 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. For a Ford with the thrust in the center, you will need three bearings – the thrust and both end main bearings. In those courses, you merely disassembled the engine and then reversed the procedure. The four measurement methods are 9-12-3, EasyTurn™, Multipoint and Continuous sweep.
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