Engine Compression
- Remove electrical wire from fuel shut-off solenoid on injection pump. Insulate wire end and remove injection pipes. Disconnect fuel return hoses. Remove injectors with removal tool (US 2775 or equivalent).
- Remove heat shields from injectors and place in cylinder being tested. Install test gauge adapter (VW 1323/2) and test gauge (VW 1323) to injector hole, operate starter and read compression. Install new injector heat shields when reinstalling injectors.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Ratio | 23.0:1 | |
| Compression Pressure | ||
| Normal | 493 psi (34.6 kg/cm2 ) | |
| Minimum | 406 psi (28.5 kg/cm2 ) | |
| Maximum Variation | 73 psi (5.1 kg/cm2 ) | |