C 1500 Truck 2WD V8-6.5L DSL Turbo VIN S (1997)
Important:
The upper crankshaft bearing inserts must have holes for the piston oil spray nozzles, or damage to the engine could result. The L57 engines were
designed to operate with the piston oil spray nozzles in cylinders 1, 2 and 3 blocked off. The L57 engines were assembled with single-hole crankshaft
bearing inserts in positions 1 and 2, with three-hole upper crankshaft bearing inserts in positions 3 and 4, and with a two-hole upper crankshaft
bearing insert in position 5. Replace the upper crankshaft bearing inserts with the same type as originally installed.
1.
Install the upper crankshaft bearing inserts to the block.
2.
Install the lower crankshaft bearing inserts to the crankshaft bearing caps.
3.
Apply engine oil to the crankshaft bearing inner surfaces (See Figure 3).
4.
Install the crankshaft (See Figure 4).
5.
Apply a 1/8 inch bead of gasket maker, GM P/N 1052942, or equivalent, on each side of the rear crankshaft bearing cap area (See Figure 5).
Important:
Crankshaft bearing cap bolt sizes are as follows:
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All inner crankshaft bearing cap bolts on crankshaft bearing 1, 2, 3, 4 and 5 are 12 mm (101 mm long) bolts.
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All outer crankshaft bearing cap bolts on crankshaft bearing caps 1 and 5 are 12 mm (68 mm long) bolts.
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All outer crankshaft bearing cap bolts on crankshaft bearing caps 2, 3 and 4 are 10 mm (68 mm long) bolts (See Figure 6).
Notice:
The crankshaft bearing caps are to be tapped into place with a brass or leather mallet before the attaching bolts are installed. Do not use the
attaching bolts to pull the crankshaft bearing caps in to their seats, as this may damage the bearing cap and/or block.
6.
Install the number 1, 2, 4 and 5 crankshaft bearing caps and bearings by tapping into place with a brass or leather mallet.
7.
Apply engine oil to the crankshaft bearing cap bolt threads.
8.
Install the crankshaft bearing cap inner 12 mm bolts.
Tighten
Tighten the inner 12 mm bolts to 75 N.m (55 lb ft).
9.
Install the number 3 crankshaft bearing cap and bearing (thrust bearing) by tapping into place with a brass or leather mallet.
10.
Install the crankshaft bearing cap inner 12 mm bolts.
Tighten
Tighten the inner 12 mm bolts to 14 N.m (10 lb ft).
11.
Tap the end of the crankshaft first rearward then forward with a lead hammer to line up the crankshaft bearing and crankshaft thrust surfaces.
Tighten
Tighten the inner 12 mm bolts to 75 N.m (55 lb ft).
12.
Measure the crankshaft end play with the crankshaft forced forward. Measure at the front end of the number 3 crankshaft bearing with a feeler
gauge. The proper clearance is 0.10 - 0.25 mm (0.004-0.010 in.).
13.
Tighten all crankshaft bearing cap bolts in the following sequence:
Tighten
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Retighten the inner 12 mm bolts to 75 N.m (55 lb ft).
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Tighten the inner 12 mm bolts an additional 90 degrees.
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Tighten the outer 12 mm bolts (crankshaft bearing caps 1 and 5) to 65 N.m (48 lb ft).
