G 1500 1/2 Ton Van V8-5.7L VIN R (1997)
Crankshaft Main Bearing: Description and Operation
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The crankshaft is made of cast modular iron. The crankshaft is supported by five crankshaft bearings.
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The crankshaft bearings are retained by the crankshaft bearing caps, which are machined with the block for proper alignment and clearances.
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Light duty models have two bolts per cap. Heavy duty models have four bolts per cap on caps two, three, and four. The number five crankshaft
bearing at the rear of the engine is the end thrust bearing.
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The four connecting rod journals (two rods per journal) are spaced 90 degrees apart. The crankshaft position sensor reluctor ring is pushed onto
the front of the crankshaft.
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The crankshaft position sensor reluctor ring has four lugs used for crankshaft timing and it is constructed of powdered metal. The reluctor ring has
an interference fit onto the crankshaft and an internal keyway for correct positioning.
