Connecting Rod and Bearings
- NOTE:
- The powdered metal connecting rod and cap are machined for proper clearances. The connecting rod and cap must be used as an assembly with no repair or modifications to either mating surface. Do not attempt to repair the rod or cap. If service is required, replace the rod and cap as an assembly.
- Do not attempt to repair the bolt hole threads of the connecting rod.
Clean the connecting rod (105) and cap (103) in solvent.
- Dry the components with compressed air.
Inspect the connecting rod for the following conditions:
- Twisting (1)
- Proper fit of the connecting rod and cap mating surfaces (2)
- Nicks or gouges in the bearing bore (3)
- Damage to the bearing locating slots (4)
Measure the connecting rod bearing bore for an out-of-round condition. Refer to Engine Mechanical Specifications (LV1) .
To determine piston pin-to-connecting rod bore clearance, use a micrometer and measure the piston pin OD.
To determine the piston pin-to-connecting rod bore clearance, use a micrometer and measure the connecting rod pin bore (1) ID.
- Subtract the piston pin OD measurement from the connecting rod pin bore ID measurement to determine pin-to-bore clearance. Refer to Engine Mechanical Specifications (LV1) .
Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves indicate fatigue.
Inspect the connecting rod bearings for excessive scoring or discoloration.
- Inspect the connecting rod bearings for dirt or debris imbedded into the bearing material.
Inspect the connecting rod bearings for improper seating indicated by bright, polished sections of the bearing surface.
- Measure the connecting rod bearings for excessive connecting rod bearing-to-crankshaft journal clearance. Refer to Crankshaft and Bearing Cleaning and Inspection .
Refer to Safety Glasses Warning .