Auto Service Professional

DEC 2018

Magazine for the auto service professional

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14 A S P D e c e m b e r 2 018 T e c h s H e l p i n g T e c h s T Compiled by Mike Mavrigian It's all about information. The more we know, the better job we can do. No one is an expert on everything. That's where infor- mation sharing becomes so critical. Every tech has faced a problem wherein the rem- edy isn't easily found in a repair manual. When a specific problem is faced and a technician discovers a fix, sharing that in- formation with others helps those who may be faced with the same challenge. We're in this together, so let's help each other out. LS THRUST BEARING A customer recently had an LS2 engine rebuilt. He ran it for a few hundred miles. During the first oil change, he noticed copper "dust" in the drained oil. To make a long story short, during the teardown we saw that the thrust bearing (lo- cated at the center, number 3 main cap) was bad- ly worn, just on the thrust faces. We determined this was due to improper installation. When installing new main bearings in an LS engine, initially tighten the main caps to only about 10 .-lbs., then use a brass hammer and knock the cranksha forwards and rearwards several times. is helps to "square" the thrust bearing surfaces to the main cap and main web. Tighten further to about 40 .-lbs. and knock the crank back and forth again, and check for ease of crank rotation. Once the main caps have been fully tight- ened (using torque plus angle if using OE bolts) 8 th annual 'Tips Before installing the crankshaft, be sure to apply assembly lubricant to the front and rear thrust faces of the number 3 main bearings.

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