Mechanical Inspection: Compression
Ensure battery is fully charged. Warm engine to normal operating temperature. Disconnect wire at ignition coil to prevent engine from starting. Check engine compression with all spark plugs removed and throttle wide open.
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | |||||
| Ram Pickup (8.0L) | 8.4:1 | ||||
| All Others | 9.1:1 | ||||
| Normal Compression Pressure | (1) | ||||
| Minimum Compression Pressure | |||||
| Dakota | |||||
| 2.5L | (1) | ||||
| 3.9L, 5.2L & 5.9L | 100 psi (690 kPa) | ||||
| Durango | 100 psi (690 kPa) | ||||
| Ram Pickup | 100 psi (690 kPa) | ||||
| Ram Van Ram Wagon | 100 psi (690 kPa) | ||||
| Maximum Variation Between Cylinders | (1) | ||||
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