Engine Compression
- Prior to checking compression, ensure batteries are fully charged. DO NOT add oil to cylinders. Adding oil may cause hydrostatic lock and extensive engine damage.
- Start and warm engine to normal operating temperature. Turn ignition off. Remove air cleaner and/or intake opening cover. Disconnect injection pump cut-off solenoid.
- Remove all glow plugs and insert a compression gauge in No. 1 cylinder glow plug hole. With ignition off, crank engine through at least 5 compression strokes. Note number of strokes required to obtain highest reading. Repeat check on each cylinder, cranking engine same number of compression strokes.
NOTE:
Maximum compression variation between cylinders is 25%.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| 7.3L | 20.7:1 | |