Chevrolet Silverado / GMC Sierra. Manual — part 190

2. Install the J 8037 onto the piston and compress the piston rings. See Special Tools.

Fig. 635: View Of Piston
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: When assembled, the following reference marks must be

addressed; the reference mark on top of the piston (1) must
face the front of the engine block. The dimple on the
connecting rod (2) must face the front of the engine block on
cylinders 2, 4, and 6, and towards the rear of the engine
block on cylinders 1, 3, and 5. Wrap a clean, lint free towel
around the connecting rod ends when installing the piston
into the cylinder so as not to damage the crankshaft journals

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

3. Check reference marks prior to installation into the block.

Fig. 636: View Of Connecting Rod & Piston Assembly
Courtesy of GENERAL MOTORS CORP.

or cylinder bore.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

4. Install the piston and connecting rod assembly, and the J 8037 into the proper cylinder bore.

See Special Tools.

Fig. 637: Installing Piston & Connecting Rod Assembly Into Engine
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

5. Use the J 8037 and lightly tap the top of the piston with a wooden hammer handle. See

Special Tools.

Hold the J 8037 firmly against the engine block until all of the piston rings have entered the
cylinder bore. See Special Tools.

IMPORTANT: The connecting rods and rod bearing caps are NOT

interchangeable. Reference the match marks on the
connecting rods and the connecting rod bearing caps made
in the removal procedure to ensure that they are assembled
in their original position and direction, with the connecting
rod/rod bearing cap mating surfaces properly oriented and
aligned.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado