Piston Pins and Connecting Rods Inspection
Piston Pins and Connecting Rods InspectionPiston Pins
^ 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 or piston.
^ Piston pin clearance: Check piston pin clearance in small end. Replace connecting rod if its small end is badly worn or damaged or if measured clearance exceeds limit.
Piston pin clearance in small end
0.003 - 0.014 mm (0.0001 - 0.0005 in.)
Small-end bore
21.003 - 21.011 mm (0.8269 - 0.8272 in.)
Piston pin diameter
20.997 - 21.000 mm (0.82665 - 0.82677 in.)
Connecting Rods
^ Big-end side clearance:
Check big-end of connecting rod for side clearance, with 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: 0.25 - 0.35 mm (0.0099 - 0.0137 in.)
Limit: 0.45 mm (0.0177 in.)
^ Connecting rod alignment:
Mount connecting rod on aligner to check it for bow and twist. If limit is exceeded, replace it.
Connecting rod alignment
Limit on bow: 0.05 mm (0.0020 in.)
Limit on twist: 0.10 mm (0.0039 in.)