EMA - 66 ENGINE MECHANICAL SYSTEM
4. Inspect the piston r ing side clearance.
Using a feeler gauge, measure the clearancebetween
new piston ring and the wall of the ring groove.
Piston ring side clearance
Standard
No.1 : 0.03 ~ 0.07mm(0.0012 ~ 0.0027in)
No.2 : 0.03 ~ 0.07mm(0.0012 ~ 0.0027in)
Oil ring : 0.06 ~ 0.15mm(0.0024 ~ 0.0059in)
Limit
No.1 : 0.1mm(0.004in)
No.2 : 0.1mm(0.004in)
Oil ring : 0.2mm(0.008in)
ECKD001G
If the clearance is greater than maximum, replace the
piston.
5. Inspect piston ring end gap.
To measure the piston ring end gap, insert a piston
ring into the cylinder bore. Position the r ing at right
angles to the cylinder wall by gently pressing it down
with a piston. Measure the gap with a feeler gauge. If
the gap exceeds the service limit, replace the piston
ring. If th e g ap is to o large, recheck the cylinder bore
diameter against the wear limits. If the bore is over
the service limit, the cylinder block must be replaced.
Piston ring end gap
Standard
No.1 : 0.17 ~ 0.32mm(0.0067 ~ 0.0126in)
No.2 : 0.32 ~ 0.47m(0.0126 ~ 0.0185in)
Oil ring : 0.20 ~ 0.70mm(0.0079 ~ 0.0275in)
Limit
No.1 : 0.6mm(0.0236in)
No.2 : 0.7mm(0.0275in)
Oil ring : 0.8mm(0.0315in.)
ECKD001K
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