Chevrolet Silverado / GMC Sierra. Service manual — part 191

Fig. 638: View Of Bearing, Bearing Cap & Bolts
Courtesy of GENERAL MOTORS CORP.

6. Install the connecting rod bearing, cap, and bolts.

Tighten:

1. Tighten the bolts evenly on the first pass to 20 N.m (15 lb ft).

2. Use the J 45059 in order to tighten the bolts on the final pass an additional 100

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

degrees. See Special Tools.

Fig. 639: Measuring Connecting Side Clearance
Courtesy of GENERAL MOTORS CORP.

7. After the piston and connecting rod assemblies have been installed, lightly tap each

connecting rod assembly, parallel to the crankpin, in order to ensure that the connecting
rods have side clearance.

8. Use a feeler gage or a dial indicator to measure the connecting rod side clearance between

the connecting rod caps. The connecting rod side clearance should be 0.15-0.44 mm (0.006-
0.017 in).

CAMSHAFT INSTALLATION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 640: View Of Engine Camshaft Front Bolts
Courtesy of GENERAL MOTORS CORP.

1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, or engine

oil supplement GM P/N 1052367 (Canadian P/N 992367) or equivalent, to the following
components:

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

The engine camshaft lobes

The camshaft bearing journals

The camshaft bearings

The distributor drive gear

2. Install three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.

3. Use the bolts as a handle in order to install the engine camshaft.

4. Remove the 3 bolts from the front of the engine camshaft.

NOTE:

All camshaft journals are the same diameter, so care must be
used in removing or installing the camshaft to avoid damage to
the camshaft bearings.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado