Cylinder Block - Inspection (Piston and Piston Pin Clearance / Piston Ring Side Clearance)
EM-239spec tableSpecifications given separately for CD17 and CD20 diesel engines.
Inspection
Piston and Piston Pin Clearance
- 1Measure outer diameter of piston pin and inner diameter of piston pin hole.
- 2Calculate piston to piston pin clearance.
| Specification | Value |
|---|---|
| Pin diameter (CD17)0.9446 - 0.9449 in | 23.994 - 24.000mm |
| Pin diameter (CD20)0.9840 - 0.9843 in | 24.994 - 25.000mm |
| Pin hole diameter (CD17)0.9445 - 0.9448 in | 23.991 - 23.999mm |
| Pin hole diameter (CD20)0.9839 - 0.9842 in | 24.991 - 24.999mm |
| Clearance-0.0002 to 0 in (Interference fit) | -0.004 to 0mm |
Pin diameter (CD17)0.9446 - 0.9449 in
23.994 - 24.000mm
Pin diameter (CD20)0.9840 - 0.9843 in
24.994 - 25.000mm
Pin hole diameter (CD17)0.9445 - 0.9448 in
23.991 - 23.999mm
Pin hole diameter (CD20)0.9839 - 0.9842 in
24.991 - 24.999mm
Clearance-0.0002 to 0 in (Interference fit)
-0.004 to 0mm
NOTE
Service parts are available as a set of piston and piston pin.
PISTON RING SIDE CLEARANCE
Side clearance:
Piston Ring Side Clearance - CD17 (Unit: mm (in))
Top ring
Standard0.020 - 0.060 (0.0008 - 0.0024)
Limit0.20 (0.0079)
2nd ring
Standard0.040 - 0.080 (0.0016 - 0.0031)
Limit0.15 (0.0059)
Oil ring
Standard0.030 - 0.070 (0.0012 - 0.0028)
Limit0.10 (0.0039)
Piston Ring Side Clearance - CD20 (Unit: mm (in))
Top ring
Standard0.060 - 0.095 (0.0024 - 0.0037)
Limit0.10 (0.0039)
2nd ring
Standard0.040 - 0.075 (0.0016 - 0.0030)
Limit0.10 (0.0039)
Oil ring
Standard0.030 - 0.070 (0.0012 - 0.0028)
Limit0.10 (0.0039)