4. DISASSEMBLING AND SERVICING
d) Piston ring side clearance
Check with placing each ring into each-self groove. The piston
ring should be freely turned without loosening and sticking.
Then measure with inserting feeler into clearance of the ring and
upper and lower face.
e) Piston ring end gap
Flatly place the piston into the cylinder with pushing the
piston head to working position.
Measure the opening clearance with feeler, that clearance
not too big or not to small, too big can result in cylinder
sealing performance poor while too small can result in
piston expanded from heating and blocked in the cylinder,
PISTON RING
thus causing piston broken and “sticking”. If opening clearance is too small, file the opening
with fine flat file. Often check in the cylinder when filing until the proper clearance is got.
④Check connecting rod
If connecting rod bending, twisting or big end shaft bush and small end outer ring movement
or crack on one side, should be rejected and replaced with new one.
a) Check small end diameter
If out of the standard or exceed service limit, replace the connecting rod.
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