Isuzu C240 - Piston Ring

TCM SHoP MANUAL
PISTON RING
Z
Piston Ring Gap
Piston Ring Gap
H 1.
Insert the piston ring horizontally (in the position it
would assume if it were installed to the piston) into
the cylinder liner bore.
Use an inverted piston to push the piston ring into
the cylinder liner until it reaches either measuring
point © or the measuring point @. Cylinder liner
diameter is smallest at these two points.
Do not allow the piston ring to slant to one side or
the other. It must be perfectly horizontal.
Cylinder Liner Measuring Point ©: 10 mm (0.39 in)
Cylinder Liner Measuring Point @: * A point where
the liner dia-
meter is smallest.
Use a feeler gauge to measure the piston ring gap.
If the measured value exceeds the specified limit,
the piston ring must be replaced.
mm (in)
Limit
Standard
‘1st Compression
15
Ring Gap (0.0591)
0.4
0.2 - 0. 15
(0.0079 - 0.0158)
(0.0591)
2nd Compression
Ring Gap
0.2 - 0.4
(0.0079 - 0.0158)
1.5
(0.0591)
3rd Compression
Ring Gap*
0.1-0.3
OIF
Bing
ae
(0.0039
-
0.0118)
15
(0.0591)
4,
Where the Four Rings Type is used.
Visually inspect the piston rings.
If a piston ring groove is damaged or distorted, the
piston must be replaced.
“1+