Valve Body Assembly: Inspection
- Remove gasket from lower valve body. Note check ball, pin, spring and retainer location. Hold plate to lower valve body to ensure check balls do not fall out. Remove plate and gasket and note check ball, pin and retainer locations on upper valve bodies. Clean all parts in solvent. Dry with compressed air. Ensure all valve body passages are clear.
- Inspect valves for scoring or roughness. Ensure valves slide freely in bores. Inspect valve springs for damage, squareness and collapsed coils. Measure spring free length and outer diameter. Replace spring if not within specification. See appropriate VALVE BODY SPRING SPECIFICATIONS table. See Figure -Fig 4 .
LOWER VALVE BODY SPRING SPECIFICATIONS
| Spring No. | Diameter: In. (mm) | Free Length: In. (mm) |
|---|---|---|
| 1 | .677 (17.20) | 2.216 (56.29) |
| 2 | .394 (10.01) | 1.395 (35.42) |
| 3 | .394 (10.01) | 1.667 (42.34) |
| 4 | .445 (11.30) | 1.362 (34.59) |
| 5 | .517 (13.13) | 1.501 (38.13) |
| 6 | .437 (11.10) | 1.265 (32.13) |
FRONT UPPER VALVE BODY SPRING SPECIFICATIONS
| Spring No. | Diameter: In. (mm) | Free Length: In. (mm) |
|---|---|---|
| 1 | .686 (17.42) | 2.804 (71.22) |
| 2 | .338 (8.59) | .757 (19.23) |
| 3 | .429 (10.90) | 1.557 (39.55) |
| 4 | .270 (6.86) | .906 (23.01) |
REAR UPPER VALVE BODY SPRING SPECIFICATIONS
| Spring No. | Diameter: In. (mm) | Free Length: In. (mm) |
|---|---|---|
| 1-3 | .350 (8.90) | 1.148 (29.16) |
| 4 | .362 (9.19) | 1.478 (37.54) |