Chevrolet Silverado / GMC Sierra. Manual — part 141

1. Install the new piston pin and connecting rod assembly.

1. Lubricate the piston pin bores with clean engine oil.

2. Use a torch and apply MILD heat to the piston pin end of the connecting rod.

3. Use the J 24086-C in order to press the new piston pin into the piston and connecting

rod assembly. See Special Tools.

4. Inspect for the proper installation of the piston and piston pin.

The piston must move freely on the new piston pin with no binding or interference.

NOTE:

Applying excessive heat to the connecting rod may damage or
distort the rod. Rod temperature SHOULD NOT exceed 315°C
(600°F). At this temperature the end of the connect ing rod will
turn a straw color upon visual inspection.

NOTE:

After the J 24086-C installer hub bottoms on the support
assembly, DO NOT exceed 35,000 kPa (5,000 psi) or the tool
may be damaged.

IMPORTANT: When assembling the piston and connecting rod, the mark on

the top of the piston must point to the front of the engine
block. The left bank connecting rods should have the flange
face toward the front of the engine block. The right bank
connecting rods should have the flange face toward the rear
of the engine block.
The new piston pin has an interference fit into the connecting
rod and is full floating in the piston.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 474: Removing/Installing Piston Rings
Courtesy of GENERAL MOTORS CORP.

2. Install the piston rings onto the piston.

1. Install the oil control piston ring spacer.

2. Install the lower oil control piston ring.

NOTE:

Use a piston ring expander to install the piston rings. The rings
may be damaged if expanded more than necessary.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

3. Install the upper oil control piston ring.

4. Install the lower compression piston ring.

The mark on the side of the piston ring should face the top of the piston.

5. Install the upper compression piston ring.

The mark on the side of the piston ring should face the top of the piston.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado