ENGINE / TRANSMISSION
7. Measure connecting rod small end ID. Replace crankshaft
if connecting rod small end is out-of-round.
8. Measure piston ring to groove clearance by placing the ring
in the ring land and measuring with a thickness gauge.
Replace piston and rings if ring-to-groove clearance
exceeds service limit.
9. Place each piston ring inside cylinder using piston to push
ring squarely into place as shown.
Piston Ring Installed gap:
STD- 0.10~0.25mm.(.002~.008”)
Limit: 0.5mm.
NOTE: Measure at two points in the cylinder. A
difference in end gap indicates cylinder wear. The
cylinder should be measured for excessive taper
and out of round.
10. If the installed gap measurement exceeds the limit,
replace the rings.
NOTE: Always check piston ring installed gap after
re-boring a cylinder or when installing new rings. A
re-bored cylinder should always be scrubbed
thoroughly with hot soapy water, rinsed, and dried
completely. Wipe cylinder bore with an oil rag
immediately to remove residue and prevent rust.
Piston Ring Installation
NOTE: Apply clean engine oil to all ring surfaces
and ring lands. Always check piston ring installed
gap before rings are installed on piston. If the
piston has been in service, clean any accumulated
carbon from the ring grooves and oil control ring
holes.
1. Place oil control ring expander in oil ring groove with end
gap facing forward. The expander has no up or down. The
ends should butt squarely together and must not overlap.
2. Install oil ring top rail with end gap at least 30° from
the end of the expander.
3. Install bottom rail with gap at least 30°
the expander on the side opposite the top rail gap.
4. Install the second ring with the mark facing up. Position
the end gap toward the rear (intake) side of the piston.
5. Install the top ring with the chamfered edge facing up.
6. Check to make sure the rings rotate freely in the groove when
compressed by hand.
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