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Crankshaft And Main Bearings

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Crankshaft is a rolled fillet type. DO NOT machine crankshaft. Main bearings are select fit to bearing bores in block.
  1. Mark main bearing caps in relation to cylinder block. Measure main bearing journal diameter, out-of-round and taper. Determine main bearing oil clearance.
  2. The cylinder block grade is indicated on right lower portion of cylinder block. The crankshaft journal grade is indicated on No. 1 crankshaft counterweight. Match cylinder block grade and crankshaft journal grade. From the Crankshaft Bearing Grade chart, determine which bearing grade (color code) is required. Verify crankshaft bearing clearance using Plastigage™ method.
  3. If measurement is not within specification, replace main bearings. DO NOT machine crankshaft. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS.
  4. Apply a thin film of RTV to crankshaft seal area of rear main bearing cap. Lightly oil cap bolt threads. Tap rear main bearing cap into place with brass or leather mallet. Install cap bolts, and tighten slightly. Align thrust bearing surfaces and measure crankshaft end play. See THRUST BEARING .
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