Connecting Rod Bearings Replacement (On-Vehicle)

CONNECTING ROD BEARINGS













Connecting rod bearings are the precision insert type and do not use shims for adjustment. Do not file connecting rods or rod caps. If clearances are found to be excessive, a new bearing will be required. Service bearings are available in standard size and 0.013 mm and 0.026 mm undersize for use with new and used standard size crankshafts.


Remove or Disconnect
1. Oil pan assembly.
- Oil Pan
2. Oil pump assembly.
- Oil Pump

Important: Place matchmarks or numbers on connecting rod assemblies (83) and connecting rod caps (81). Connecting rod caps (81) must be assembled to their original connecting rod assemblies (83).

3. Connecting rod nuts (80).
4. Connecting rod cap (81) and bearings (82).
^ Keep bearings (82) with their original connecting rod assembly (83) and cap (81) for reassembly.
^ Wipe oil from bearings (82) and crankpins.


Inspect
^ Bearings (82) for excessive wear or damage.


Measure
1. Crankpin for out-of-round and taper with a micrometer.
^ If not within specifications, replace or recondition crankshaft assembly.
^ If installing new bearings (82), determine new bearing size from the maximum crankpin diameter.

2. Bearing clearances, using gaging plastic.

A. Place piece of gaging plastic the full width of bearing (82), (parallel to crankshaft assembly) onto the crankpin.
^ Gaging plastic should be positioned in middle of bearing (82). Bearing (82) is thickest in center and bearing clearance must be measured at this location.

B. Jnstall connecting rod cap (81) with bearing (82) onto connecting rod assembly (83).

C. Install connecting rod nuts (80).
Tighten Connecting rod nuts (80), evenly, to 50 N.m (37 lb. ft.).

NOTICE: Do not turn the crankshaft assembly with the gaging plastic installed or the accuracy of the measurement will be affected.

D. Remove connecting rod nuts (80) and cap (81). Gaging plastic will be found adhering to either connecting rod cap (81) or crankshaft journal and is measured without removing it.

E. Measure gaging plastic at its widest, using scale provided with gaging plastic.
^ If clearance is greater than specified, select an undersize bearing (82) and remeasure clearance.
^ If clearance cannot be brought to specifications, regrind crankpin.
^ If crankpin is already at maximum undersize, replace crankshaft assembly (22).

F. Remove all gaging plastic material after measuring.


Install or Connect
1. Coat inside surface of bearings (82) with engine oil.
2. Connecting rod cap (81) and bearings (82).
3. Connecting rod nuts (80).
- Tighten Connecting rod nuts (80) evenly, to 50 N.m (37 lb. ft.).


Measure
^ Connecting rod side clearance.

A. When all connecting rod bearings (82) have been installed, tap each connecting rod assembly (83) lightly parallel to crankpin to make sure they have clearance.

B. Measure side clearance between connecting rod caps (81) using a feeler gage, or dial indicator.

C. Rod side clearance should be 0.18 to 0.44 mm (0.007 to 0.017 inch).

4. Oil pump assembly.
5. Oil pan assembly.