Piston Pins and Connecting Rods Inspection

"The content of this article/image reflects the changes identified in TSB - TS 29 08130."


Piston Pins and Connecting Rods Inspection

Reference: Piston, Piston Ring and Connecting Rod Disassembly and Reassembly:N32A

Piston Pin

Visual inspection
Check piston pin, connecting rod small end bore and piston bore for wear or damage, paying particular attention to condition of small end bore bush. If pin, connecting rod small end bore or piston bore is badly worn or damaged, replace pin, connecting rod and/or piston.

Piston pin clearance
Check piston pin clearance in small end and piston. Replace connecting rod and/or piston if its small end is badly worn or damaged or if measured clearance exceeds limit.
Piston pin clearance in connecting rod small end
Standard: 0.007 - 0.024 mm (0.0003 - 0.0009 in.)
Limit: 0.034 mm (0.00013 in.)
Piston pin clearance in piston
Standard: 0.004 - 0.012 mm (0.00016 - 0.00047 in.)
Limit: 0.017 mm (0.0007 in.)
Small-end bore
24.007 - 24.021 mm (0.9452 - 0.9457 in.)
Piston pin diameter
23.997 - 24.0000 mm (0.9448 - 0.9449 in.)
Piston bore
24.004 - 24.009 mm (0.94503 - 0.94523 in.)






Connecting Rod

Big-end side clearance
Check big-end of connecting rod for side clearance with connecting rod fitted and connected to its crank pin in the normal manner. If measured clearance is found to exceed its limit, replace connecting rod.
Big-end side clearance
Standard: 0.095 - 0.355 mm (0.0037 - 0.0140 in.)
Limit: 0.42 mm (0.0165 in.)






Connecting rod alignment
Mount connecting rod on aligner to check it for bow and twist. If measured value exceeds the limit, replace it.
Connecting rod alignment
Limit on bow: 0.05 mm (0.0020 in.)
Limit on twist: 0.10 mm (0.0039 in.)