Connecting Rod: Testing and Inspection
CONNECTING ROD INSPECTION1. Install the connecting rod cap. (See CYLINDER BLOCK ASSEMBLY (I).)
2. Measure the side clearance at the large end of the connecting rod using a feeler gauge.
- If it exceeds the maximum specification, replace the connecting rod or the crankshaft.
Side clearance at the large end of the connecting rod
Standard 0.110-0.292 mm {0.0044-0.0114 in}
Maximum 0.435 mm {0.0171 in}
3. Measure the oil clearance at the large end of the connecting rod using a plastigauge.
- If it exceeds the maximum specification, replace the bearing or grind the crank pin, and use oversize bearings so that the specified clearance is obtained.
Note: Cut the plastigauge as wide as the connecting rod bearing width, place it parallel to the crankshaft, keeping away from the oil hole.
Bearing oil clearance at the large end of connecting rod
Standard 0.016-0.037 mm {0.0007-0.0014 in}
Maximum 0.10 mm {0.0039 in}
Connecting rod bearing thickness (Center thickness)
STD: 1.509-1.524 mm {0.0594-0.0599 in}
OS 0.25: 1.629-1.637 mm {0.0642-0.0644 in}
OS 0.50: 1.729-1.737 mm {0.0681-0.0683 in}
4. Measure the inner diameter at the small end of the connecting rod using a caliper gauge.
Standard connecting rod small end inner diameter 18.943-18.961 mm {0.74579-0.74649 in}
5. Calculate the clearance between the connecting rod small end inner diameter and the piston pin outer diameter.
- If not within the specification, replace the connecting rod or the piston pin.
Standard clearance between connecting rod small end and piston pin -0.037- -0.013 mm {-0.0014- -0.0006 in}
6. Inspect the connecting rod for bending and distortion using a connecting rod aligner.
- If it exceeds the maximum specification, replace the connecting rod.
Connecting rod maximum bending 0.050 mm {0.0020 in} [Per 50 mm {2.0 in}]
Connecting rod maximum distortion 0.075 mm {0.0030 in} [Per 50 mm {2.0 in}]
Connecting rod center-to-center distance 140.60-140.70 mm {5.536-5.539 in}