Workshop Manual

ENGINE ASSEMBLY II 4–17
PISTON AND PISTON RING
Piston Ring and Piston Ring Groove Clearance
Use a feeler gauge to measure the clearance between
the piston ring and the piston ring groove.
Do this at several points around the piston.
If the clearance between the piston ring and the piston
ring groove exceeds the specified limit, the piston ring
must be replaced.
Piston Ring and Piston Ring Groove Clearance
mm (in)
Standard Limit
1st Compression
——
Ring
2nd Compression 0.070–0.110 0.15
Ring (0.0028–0.0043) (0.0059)
3rd Compression 0.050–0.090 0.15
Ring (0.0020–0.0035) (0.0059)
Oil Ring
0.030–0.070 0.15
(0.0012–0.0028) (0.0059)
82
Cylinder Liner Bore and Piston Clearance
(For service parts) mm (in)
Piston Selection
Select the same grade number as the one for the cylin-
der liner inside dia meter.
Note:
Cylinder liner piston kit clearances are preset. However,
the cylinder liner installation procedure may result in
slight decreases in cylinder liner bore clearances.
Piston Outside Diameter
Measure the piston outside diameter at the measuring
piston shown in the illustration.
Piston Grade (For service parts) mm (in)
AX CX
104.959–104.974 104.975–104.990
(4.1322–4.1328) (4.1329–4.1335)
Cylinder Liner Bore and 0.051–0.085
Piston Clearance (0.002–0.0033)
Grade of cylinder
Grade of piston Combination
inside diameter
AX AX OK
CX CX OK
AX CX NG
CX AX NG