Service Data and Specifications (S.D.S.) — Inspection and Adjustment (Cont'd): Piston, Piston Ring and Piston Pin
EM-50spec tableInspection and Adjustment (Cont'd)
PISTON, PISTON RING AND PISTON PIN
Piston
Piston Skirt Diameter (A) — Unit: mm (in)
| Parameter | Sub-Category | Grade | Value mm (in) |
|---|---|---|---|
| Piston skirt diameter (A) | Service (Standard) | Grade No. 1 | 82.975 - 82.985 (3.2667 - 3.2671) |
| Piston skirt diameter (A) | Service (Standard) | Grade No. 2 | 82.985 - 82.995 (3.2671 - 3.2675) |
| Piston skirt diameter (A) | Service (Standard) | Grade No. 3 | 82.995 - 83.005 (3.2675 - 3.2679) |
| Piston skirt diameter (A) | Service (Standard) | Grade No. 4 | 83.005 - 83.015 (3.2679 - 3.2683) |
| Piston skirt diameter (A) | Service (Standard) | Grade No. 5 | 83.015 - 83.025 (3.2683 - 3.2687) |
| Piston skirt diameter (A) | Service (Oversize) | 0.5 (0.020) | 83.475 - 83.525 (3.2864 - 3.2884) |
| Piston skirt diameter (A) | Service (Oversize) | 1.0 (0.039) | 83.975 - 84.025 (3.3061 - 3.3081) |
| Dimension (a) | Approximately 14 (0.55) | ||
| Piston pin hole diameter (d) | 19.987 - 19.999 (0.7869 - 0.7874) | ||
| Piston-to-cylinder bore clearance | 0.015 - 0.035 (0.0006 - 0.0014) |
Piston skirt diameter (A)
Sub-CategoryService (Standard)
GradeGrade No. 1
Value mm (in)82.975 - 82.985 (3.2667 - 3.2671)
Piston skirt diameter (A)
Sub-CategoryService (Standard)
GradeGrade No. 2
Value mm (in)82.985 - 82.995 (3.2671 - 3.2675)
Piston skirt diameter (A)
Sub-CategoryService (Standard)
GradeGrade No. 3
Value mm (in)82.995 - 83.005 (3.2675 - 3.2679)
Piston skirt diameter (A)
Sub-CategoryService (Standard)
GradeGrade No. 4
Value mm (in)83.005 - 83.015 (3.2679 - 3.2683)
Piston skirt diameter (A)
Sub-CategoryService (Standard)
GradeGrade No. 5
Value mm (in)83.015 - 83.025 (3.2683 - 3.2687)
Piston skirt diameter (A)
Sub-CategoryService (Oversize)
Grade0.5 (0.020)
Value mm (in)83.475 - 83.525 (3.2864 - 3.2884)
Piston skirt diameter (A)
Sub-CategoryService (Oversize)
Grade1.0 (0.039)
Value mm (in)83.975 - 84.025 (3.3061 - 3.3081)
Dimension (a)
Sub-Category
Grade
Value mm (in)Approximately 14 (0.55)
Piston pin hole diameter (d)
Sub-Category
Grade
Value mm (in)19.987 - 19.999 (0.7869 - 0.7874)
Piston-to-cylinder bore clearance
Sub-Category
Grade
Value mm (in)0.015 - 0.035 (0.0006 - 0.0014)
Piston pin
| Specification | Value |
|---|---|
| Piston pin outer diameter(0.7870 - 0.7874) | 19.989 - 20.001mm (in) |
| Interference fit of piston pin to piston pin hole clearance(0 - 0.0002) | 0 - 0.004mm (in) |
| Piston pin to connecting rod bearing clearance(0.0002 - 0.0007) | 0.005 - 0.017mm (in) |
Piston pin outer diameter(0.7870 - 0.7874)
19.989 - 20.001mm (in)
Interference fit of piston pin to piston pin hole clearance(0 - 0.0002)
0 - 0.004mm (in)
Piston pin to connecting rod bearing clearance(0.0002 - 0.0007)
0.005 - 0.017mm (in)
Piston ring
Piston Ring — Unit: mm (in)
| Measurement | Ring | Standard | Limit |
|---|---|---|---|
| Side clearance | Top | 0.040 - 0.073 (0.0016 - 0.0029) | 0.1 (0.004) |
| Side clearance | 2nd | 0.030 - 0.063 (0.0012 - 0.0025) | 0.1 (0.004) |
| End gap | Top | 0.25 - 0.42 (0.0098 - 0.0165) | 1.0 (0.039) |
| End gap | 2nd | 0.38 - 0.64 (0.0150 - 0.0252) | 1.0 (0.039) |
| End gap | Oil (rail ring) | 0.20 - 0.76 (0.0079 - 0.0299) | 1.0 (0.039) |
Side clearance
RingTop
Standard0.040 - 0.073 (0.0016 - 0.0029)
Limit0.1 (0.004)
Side clearance
Ring2nd
Standard0.030 - 0.063 (0.0012 - 0.0025)
Limit0.1 (0.004)
End gap
RingTop
Standard0.25 - 0.42 (0.0098 - 0.0165)
Limit1.0 (0.039)
End gap
Ring2nd
Standard0.38 - 0.64 (0.0150 - 0.0252)
Limit1.0 (0.039)
End gap
RingOil (rail ring)
Standard0.20 - 0.76 (0.0079 - 0.0299)
Limit1.0 (0.039)