Engine 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.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | |||||
| Caravan | |||||
| 2.4L | 9.4:1 | ||||
| 3.0L | 8.9:1 | ||||
| 3.3L | 8.9:1 | ||||
| 3.8L | 9.6:1 | ||||
| Dakota & Durango | 9.1:1 | ||||
| Ram Pickup | |||||
| 3.9L, 5.2L & 5.9L (Gasoline) | 9.1:1 | ||||
| 5.9L (Diesel) | 17.5:1 | ||||
| 8.0L | 8.4:1 | ||||
| Ram Van & Ram Wagon | 9.1:1 | ||||
| Town & Country | |||||
| 3.3L | 8.9:1 | ||||
| 3.8L | 9.6:1 | ||||
| Voyager | |||||
| 2.4L | 9.4:1 | ||||
| 3.0L | 8.9:1 | ||||
| 3.3L | 8.9:1 | ||||
| Normal Compression Pressure | |||||
| Caravan | |||||
| 2.4L | 170-225 psi (11.9-15.7 kg/cm2 ) | ||||
| 3.0L | 178 psi (12.5 kg/cm2 ) | ||||
| 3.3L & 3.8L | (1) | ||||
| Dakota | |||||
| 2.5L | 120-150 psi (8.4-10.5 kg/cm2 ) | ||||
| 3.9L, 5.2L & 5.9L | (1) | ||||
| Durango | (1) | ||||
| Ram Pickup, Ram Van & Ram Wagon | (1) | ||||
| Town & Country | (1) | ||||
| Voyager | |||||
| 2.4L | 170-225 psi (11.9-15.7 kg/cm2 ) | ||||
| 3.0L | 178 psi (12.5 kg/cm2 ) | ||||
| 3.3L | (1) | ||||
| Minimum Compression Pressure | |||||
| Caravan, Town & Country, & Voyager | 100 psi (7.0 kg/cm2 ) | ||||
| Dakota | |||||
| 2.5L | (1) | ||||
| 3.9L, 5.2L & 5.9L | 100 psi (7.0 kg/cm2 ) | ||||
| Durango | 100 psi (7.0 kg/cm2 ) | ||||
| Ram Pickup | |||||
| 3.9L, 5.2L & 5.9L (Gasoline) & 8.0L | 100 psi (7.0 kg/cm2 ) | ||||
| 5.9L (Diesel) | (1) | ||||
| Ram Van & Ram Wagon | 100 psi (7.0 kg/cm2 ) | ||||
| Maximum Variation Between Cylinders | |||||
| Caravan, Town & Country, & Voyager | 25 Percent | ||||
| Dakota | |||||
| 2.5L | 30 psi (2.1 kg/cm2 ) | ||||
| 3.9L, 5.2L & 5.9L | (1) | ||||
| Durango, Ram Pickup, Ram Van & Ram Wagon | (1) | ||||
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