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.

seep onto the thrust bearing face, pro-viding a film of lubrication. Some thrust ... This big-block Chevy rear main cap from an early-generation

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