Chevrolet Silverado / GMC Sierra. Service manual — part 187

Fig. 625: Measuring Crankshaft End Play
Courtesy of GENERAL MOTORS CORP.

12. Measure the crankshaft end play.

1. Firmly thrust the crankshaft rearward, and then forward.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

This will align the crankshaft rear bearing thrust surfaces.

2. With the crankshaft pushed forward, insert a feeler gage between the crankshaft and

the crankshaft rear bearing thrust surface to measure the clearance.

Specification: Crankshaft end play 0.05-0.20 mm (0.002-0.008 in)

13. Rotate the crankshaft in order to check for binding.

A bent crankshaft or lack of proper crankshaft bearing clearance may cause binding.

14. If the crankshaft does not turn freely, loosen the crankshaft bearing cap bolts on 1 crankshaft

bearing cap at a time in order to determine the location of the binding.

A lack of proper crankshaft bearing clearance may be caused by the following:

Burrs on the crankshaft bearing cap

Foreign material between the crankshaft bearing and the engine block

Foreign material between the crankshaft bearing and the crankshaft bearing cap

Damaged crankshaft bearing

Improper size crankshaft bearing

CRANKSHAFT REAR OIL SEAL AND HOUSING INSTALLATION

Tools Required

J 35621-B Rear Main Seal Installer. See Special Tools.

Installation

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 626: Locating Crankshaft Rear Oil Seal Housing Retainer Stud
Courtesy of GENERAL MOTORS CORP.

1. Install the crankshaft rear oil seal housing retainer stud.

Tighten: Tighten the crankshaft rear oil seal housing retainer stud to 6 N.m (53 lb in).

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 627: Identifying Crankshaft Rear Oil Seal Housing Gasket
Courtesy of GENERAL MOTORS CORP.

2. Install the NEW crankshaft rear oil seal housing gasket.

IMPORTANT: Always use a NEW crankshaft rear oil seal housing gasket

when installing the crankshaft rear oil seal housing.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado