Crankshaft Pin and Connecting Rod Bearings Inspection
Crank Pin and Connecting Rod Bearings InspectionReference: Piston, Piston Ring and Connecting Rod Disassembly and Reassembly:N32A
Crank Pin Diameter
Inspect crank pin for uneven wear or damage. Measure crank pin for out-of-roundness or taper using micrometer. If crank pin is damaged or out-of round or taper is out of limit, replace crankshaft.
Crank pin diameter
Standard: 55.992 - 56.008 mm (2.2044 - 2.2050 in.)
Crank pin taper (a, b) and out-of-round (A - B)
Limit: 0.01 mm (0.0004 in.)
Connecting Rod Bearing Visual Inspection
Inspect bearing shells for signs of fusion, pitting, burn or flaking and observe contact pattern.
Defective bearing shells must be replaced.
Connecting Rod Bearing Clearance
1) Clean bearing and crank pin.
2) Place a piece of gauging plastic (1) to full width of crank pin as contacted by bearing (parallel to crankshaft), avoiding oil hole.
3) Install new connecting rod bearing and its cap.
4) After three minutes, remove cap and using scale (2) on gauging plastic envelope, measure gauging plastic (1) width at the widest point (clearance).
Connecting rod bearing clearance
Standard: 0.027 - 0.081 mm (0.0011 - 0.0032 in.)
Limit: 0.081 mm (0.0032 in.)
5) If clearance is out of specification, measure crank pin diameter referring to Crank Pin and Connecting Rod Bearings Inspection:N32A.
If crank pin diameter is out of specification, replace crankshaft.
If crank pin diameter is within specification, replace connecting rod.