Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
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 | ||
|---|---|---|---|
| Compression Ratio | |||
| Cressida | 9.2:1 | ||
| Land Cruiser | 8.1:1 | ||
| Supra | |||
| Non-Turbo | 9.2:1 | ||
| Turbo | 8.4:1 | ||
| Normal Compression Pressure | |||
| Cressida | 156 psi (10.9 kg/cm2 ) | ||
| Land Cruiser | 149 psi (10.5 kg/cm2 ) | ||
| Supra | |||
| Non-Turbo | 156 psi (10.9 kg/cm2 ) | ||
| Turbo | 142 psi (10.0 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| Cressida & Supra | 128 psi (9.0 kg/cm2 ) | ||
| Land Cruiser | 114 psi (8.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| Cressida & Supra | 14 psi (1.0 kg/cm2 ) | ||
| Land Cruiser | 7 psi (.5 kg/cm2 ) | ||