5. Piston, Connecting Rod, and Bearing Cleaning and Inspection
Piston, Connecting Rod, and Bearing Cleaning and Inspection
Special Tools
* J 45059 Angle Meter
* KM-470-B Angular Torque Gage
Piston Inspection
1. Inspect the connecting rod for bending or twisting. If the connecting rod is bent or twisted, replace the connecting rod.
2. Inspect the connecting rod bearings.
3. Inspect the connecting rod lower end for wear.
4. Inspect the connecting rod upper end for scoring.
5. Inspect the crankshaft rod bearing journal for wear. Refer to Engine Mechanical Specifications (Service Limits & General Specifications).
6. Inspect the piston for scoring, cracks, and wear.
7. Inspect the piston for taper using a micrometer.
8. Inspect the piston for fit to the connecting rod.
9. Inspect the engine block deck surface for flatness using a straight edge and a feeler gauge. Refer to Engine Mechanical Specifications (Service Limits & General Specifications).
10. Inspect the bearing bore for concentricity and alignment using a bore gauge. Refer to Engine Mechanical Specifications (Service Limits & General Specifications). If the bearing bore is beyond specifications, replace the engine block.
11. Inspect the engine block cylinder bore for wear, runout, ridging and taper using a bore gauge. Refer to Engine Mechanical Specifications (Service Limits & General Specifications).
12. Inspect the engine block cylinder bore for glazing.
Connecting Rod Bearing Inspection
Warning: Refer to Battery Disconnect Warning (Battery Disconnect Warning).
1. Coat the connecting rod bearings with engine oil.
Note: Grease the connecting rod journals and lubricate the connecting rod bearings slightly so that the plastic gaging thread does not tear when the connecting rod bearing caps are removed.
2. Install the upper connecting rod bearings into the connecting rod journals.
3. Install the lower connecting rod bearings into the connecting rod bearing caps.
4. Measure all of the connecting rod bearing clearances using a commercially available plastic gaging (1), ductile plastic threads.
5. Cut the plastic gaging threads to the length of the bearing width. Lay them axially between the connecting rod journals and the connecting rod bearings.
6. Install the connecting rod bearing caps.
Caution: Refer to Fastener Caution (Fastener Caution).
7. Install the connecting rod bearing cap bolts.
Tighten the connecting rod bearing cap bolts to 25 Nm (18 lb ft).
8. Using the J 45059 or the KM-470-B (1), tighten the crankshaft cap bolts another 30 degrees plus 15 degrees.
9. Remove the connecting rod bearing caps.
10. Measure the width of the flattened plastic thread of the plastic gaging (1) using the scale printed on the plastic gaging package. Plastic gaging is available for different tolerance ranges.
11. Inspect the bearing clearance for permissible tolerance ranges. Refer to Engine Mechanical Specifications (Service Limits & General Specifications).