Replacing Main Bearings in a 1997 K 1500 Suburban 4WD V8-57L VIN R
a. Firmly thrust the crankshaft first rearward then forward. This movement will line up the rear crankshaft bearing and the crankshaft thrust
surfaces.
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Tighten the rear crankshaft bearing cap bolts to 100 Nm (74 ft. lbs.).
b. With the crankshaft wedged forward, measure at the front end of the rear crankshaft bearing with a feeler gauge. The proper clearance is
0.05-0.02 mm (0.002-0.008 inch).
c. If the correct end play cannot be obtained, ensure the correct size rear crankshaft bearing has been installed. Production engines may have rear
crankshaft bearings that are 0.2032 mm (0.008 inch) wider across the thrust faces than standard, as explained previously.
8. Inspect the crankshaft binding), complete the-following steps:
a. Try turning the crankshaft in order to check for binding.
b. If the crankshaft does not turn freely, loosen the crankshaft bearing cap bolts on one cap at a time until the tight bearing is located.
9. A lack of clearance at the bearing may be caused by the following conditions:
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Burrs on the bearing cap
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Foreign matter between the bearing and the block
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Foreign matter between the bearing and the bearing cap
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A bent crankshaft
