Transcription of THRUST BEARING FAILURE PREVENTION & ANALYSIS
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THRUST BEARING FAILURE PREVENTION & ANALYSIS
Crankshaft THRUST bearingsprovide a fore/aft gap-control for axial move-ment (or endplay) of thecrankshaft. These thrustbearings are located at aspecific main BEARING location, generallyat the center main or rear main, de-pending on engine design. A thrustbearing is either integrated with a spe-cific main BEARING assembly or indepen-dent of the main journal BEARING . If inte-grated, the THRUST BEARING area is presentin the form of flanges that extend fromthe front and rear of the main bearingshells. If independent, the half-moon-shaped THRUST bearings are inserted sep-arately into shallow reliefs on the frontand rear of the main BEARING saddle, andsometimes with the either case, the THRUST surfaces arelocated on each side of the designatedmain BEARING saddle and cap, intendedto maintain a specified fore/aft locationof the crankshaft, so that the crank does-n t walk too far forward or rearward.
The causes of a thrust bearing failure can be traced to a single problem or a combination of problems. Naturally, improper assembly—se- ... report, the most common example is the THM 400 used behind a big-block Chevy. General Motors claims …
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