CONNECTING ROD INSPECTION

Caution

• Do not use a caustic cleaning solution or damage to connecting rods can occur.

Note

• If the connecting rod large end is mechanically split or cracked to produce a unique parting face, a locking joint is produced. Parts are not interchangeable.

1. Mark and separate the parts and clean with solvent. Clean the oil passages.

Note

• The crankshaft connecting rod journals must be within specifications to check the connecting rod bearing journal clearance.

2. Remove the connecting rod bearing cap.

3. Position a piece of Plastigage across the bearing surface.

Note

• Do not turn the crankshaft during this step.

4. Install and tighten to specifications, then remove the connecting rod bearing cap.

5. Measure the Plastigage to get the connecting rod bearing journal clearance. The Plastigage should be smooth and flat. A changing width indicates a tapered or damaged connecting rod or connecting rod bearing.

• If out of specification, install new components as necessary.

Standard oil clearance

0.016-0.070 mm {0.0006299-0.0027559 in}

6. Measure the bore in two directions. The difference is the connecting rod bore out-of-round. Verify the out-of-round is within specification.

• If out of specification, install new components as necessary.

Standard journal diameter

46.89-46.91 mm {1.846059-1.850036 in}

7. Measure the inner diameter of the connecting rod bushing, if equipped. Verify the diameter is within specification.

• If out of specification, install new components as necessary.

Standard inner diameter

20.589-20.609 mm {0.810589-0.811376 in}

8. Measure the connecting rod bend on a suitable alignment fixture. Follow the instructions of the fixture manufacturer. Verify the bend measurement is within specification.

• If out of specification, install new components as necessary.

9. Measure the connecting rod twist on a suitable alignment fixture. Follow the instructions of the fixture manufacturer. Verify the measurement is within specification.

• If out of specification, install new components as necessary.

10. Measure the clearance between the connecting rod and the piston. Verify the measurement is within specification.

• If out of specification, install new components as necessary.