K 1500 Truck 4WD V8-5.7L VIN R (1997)
Crankshaft: Testing and Inspection
End Play
1. Firmly thrust the end of the crankshaft first rearward then forward. This will line up the rear crankshaft bearing and the crankshaft thrust surfaces.
2. With the crankshaft pushed forward, insert a feeler gauge between the crankshaft and the bearing surface and measure the clearance.
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End play ........................................................................................................................................................... 0.05-0.20 mm (0.002-0.008 inch)
3. If the correct end play cannot be obtained, verify that the correct size crankshaft bearing has been installed. Production engines may have rear
crankshaft bearing that are 0.2032 mm (0.008 inch) wider across the thrust faces than standard. The crankshaft on these engines can be identified
by .008 stamped on the rear-counterweight.
4. Inspect the crankshaft for binding. Turn the crankshaft to check for binding. If the crankshaft does not turn freely, loosen the crankshaft bearing
bolts, one cap at a time, until the tight bearing is located. Burrs on the bearing cap, foreign matter between the bearing and the block or the bearing
cap, or a faulty bearing could cause a lack of clearance at the bearing.
