Mechanical Inspection: Compression
Warm engine to normal operating temperature before checking the compression. Check engine mechanical condition with a compression gauge, vacuum gauge, or engine analyzer. See engine analyzer manual for specific instructions. See COMPRESSION SPECIFICATIONS table.
WARNING:
DO NOT use ignition switch during compression tests. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system.
COMPRESSION SPECIFICATIONS
| Application | Specification |
|---|---|
| Normal Compression Pressure | 191 psi (13.4 kg/cm2 ) |
| Minimum Compression Pressure | 142 psi (10.0 kg/cm2 ) |
| Maximum Variation Between Cylinders | 14 psi (1.0 kg/cm2 ) |