Yukon 4WD V8-6.5L DSL Turbo VIN S (1997)
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
^
Retighten the inner 12 mm bolts to 75 N.m (55 lb ft).
^
Tighten the inner 12 mm bolts an additional 90 degrees.
^
Tighten the outer 12 mm bolts (crankshaft bearing caps 1 and 5) to 65 N.m (48 lb ft).
^
Retighten the outer 12 mm bolts (crankshaft bearing caps land 5) to 6.5 N.m (48 lb ft).
^
Tighten the outer 12 mm bolts an additional 90 degrees.
^
Tighten the outer 10 mm bolts (crankshaft bearing caps 2, 3 and 4) to 40 N.m (30 lb ft).
DO NOT tighten the outer 10 mm bolts (crankshaft bearing caps 2, 3 and 4) an additional 90 degrees.
Notice:
Burrs on the block or crankshaft bearing cap, foreign matter between the bearing insert and the block or crankshaft bearing cap, or a faulty
bearing insert, could result a lack of clearance, causing the crankshaft to bind.
14.
Inspect the crankshaft for binding by rotating the crankshaft. If the crankshaft does not turn freely, loosen the crankshaft bearing bolts, one pair at
a time, until the tight bearing is located.
Crankshaft & Bearings Installation (P Trucks, RPO L57)
Crankshaft and Bearings installation
(P Trucks, RPO L57)
There are five crankshaft bearings numbered 1 through 5, as viewed from the front of the engine. There is an arrow on each bearing cap that points
toward the front of the engine. the center crankshaft bearing, number three, is the thrust bearing.
The upper crankshaft bearing inserts all have an oil groove and a oil gallery hole from the block in the center of the groove. The upper crankshaft bearing
inserts also have additional holes in the groove at 10 o'clock and 2 o'clock to provide oil to the oil spray nozzles. The oil spray nozzles are mounted in
the crankshaft bearing bulkheads. The lower bearing inserts do not have an oil groove or holes. During initial assembly, the crankshaft bearings are
select-fitted to each of the five crankshaft bearing bores. The total diameter size range of crankshaft bearing bores 1 through 5 is 79.826 - 79.850 mm
(3.145 - 3.146 in.).
This range divides in to three sizes, represented by the size numbers 1, 2 or 3. The proper size number is then stamped on the pan rail at the
corresponding crankshaft bearing bulkhead. The crankshaft is color-marked in red/orange, blue, or white, near each crankshaft bearing journal.
Cross-referencing the size number on the pan rail with the color on the crankshaft indicates the proper bearing selection (See Figure 1).
Crankshaft Bearings are available in standard 0.013 mm (0.0005 in.) and 0.026 mm (0.0010 in.) undersized for select fitting, in order to attain proper
crankshaft bearing clearance.
Undersized refers to the crankshaft diameter. For service purposes, bearing size combinations provide the following clearances: (See Figure 2)
Crankshaft bearing numbers 1, 2, 3 and 4: 0.045 - 0.083 mm (0.0018 - 0.0033 in.).
Crankshaft bearing number 5: 0.055 - 0.093 mm (0.0022 - 0.00 in.).
