Important: Use compressed air to dry the connecting rod. DO NOT use shop towel
or rag to clean the rod cap and the rod mating surfaces.
- Use cleaning solvent to clean the connecting rod.
- Use cleaning solvent to clean the pistons if reusing the piston.
DO NOT wire brush the piston skirt or the ring groove area.
- Use cleaning solvent to clean the piston pins if reusing the piston
pins. New pistons contain new piston pins.
- Use a groove cleaner or broken ring to clean the piston ring groove.
- Inspect the connecting
rod for the following conditions:
| • | Inspect for twists. Replace if damage is evident. |
| • | Inspect for nicks. Replace if damage is evident. |
| • | Inspect for cracks. Replace if damage is evident. |
- Inspect the pistons for
the following conditions:
| • | Inspect for cracked skirts. |
| • | Inspect for cracked piston pin bosses. |
| • | Inspect for cracked ring groove lands. |
| • | Inspect for nicks that may cause binding. |
| • | Inspect for burrs that may cause binding. |
| • | Inspect for warped ring groove lands. |
| • | Inspect for worn ring groove lands. |
| • | Inspect for eroded areas on top of the piston. |
| • | Inspect for worn piston pin bores. |
| • | Replace the piston if any of the above is evident. |
- Measure the piston ring groove clearance.
- Replace the piston if the ring groove clearance is not within
the proper specification.
Specifications
The 1st and 2nd compression ring groove clearance specification is 0.02-0.04 mm
(0.0008-0.0015 in).
- Replace the piston if the ring groove clearance is not within
the proper specification.
Specifications
The oil control ring groove clearance specification is 0.01-0.02 mm
(0.0004-0.0012 in).
- Use a micrometer and an
inside micrometer to measure the piston pin bore-to-piston pin clearance.
The maximum clearance is 0.003-0.008 mm (0.0001-0.0003 in).
- Replace the piston and replace the pin if the pin bore-to-piston
pin clearance is beyond the proper specification.
- Measure the piston ring
end gap clearance in the bore. Perform only after the cylinder has been honed.
- Replace the piston rings if the end gap clearance is not within
the proper specification.
Specifications
The 1st and 2nd compression ring gap specification is 0.30-0.50 mm
(0.0118-0.0196 in).
- Replace the piston rings if the end gap clearance is not within
the proper specification.
Specifications
The oil control ring end gap specification is 0.40-1.40 mm
(0.0157-0.0551 in).
