66. Piston, Connecting Rod, and Bearing Installation

Piston, Connecting Rod, and Bearing Installation
- Tools Required
- J5239 Connecting Rod Guide
- J8037 Piston Ring Compressor
- J36660-A Torque Angle Meter

Important: The piston and cylinder bore have been measured and the bore has been sized for the proper clearance. Install the piston and connecting rod assembly into the proper cylinder bore. The piston alignment mark MUST face the front of the engine block.

1. Lightly lubricate the following components with clean engine oil:
- The piston
- The piston rings
- The cylinder bore
- The bearing surfaces





2. Stagger the oil control ring end gaps a minimum of 90 degrees.
3. Stagger the compression ring end gaps a minimum of 25 mm (1.0 inch).
4. Install the J8037 onto the piston and compress the piston rings.

Important: The piston alignment mark MUST be facing the front of the engine block.





5. Install the J5239 on the connecting rod bolts.
6. Install the piston and connecting rod assembly into the proper cylinder bore.





7. Hold the piston ring compressor firmly against the engine block. Using a wooden hammer handle, lightly tap the top of the piston until all of the piston rings enter the cylinder bore.





8. Guide the connecting rod end onto the crankshaft journal.

Notice: Refer to Fastener Notice in Service Precautions.

9. Install the bearing, cap, and nuts.
9.1. Tighten the connecting rod bearing cap nuts a first pass to 20 Nm (15 ft. lbs.).
9.2. Tighten the connecting rod bearing cap nuts a second pass to 75 degrees using the J36660-A.





10. With the pistons and connecting rods installed, use a soft faced mallet and lightly tap each connecting rod assembly parallel to the crankpin to make sure that the rods have side clearance.
11. Measure the connecting rod side clearance using a feeler gauge or dial indicator. Connecting rod side clearance should be within 0.18 - 0.44 mm (0.007 - 0.017 inch).