lemon-mirror:
Home >> GMC >> 1985 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - Diesel >> Testing >> Engine Compression >> 6.2L

Engine Compression: 6.2L

  1. Remove air cleaner. Disconnect electrical wire from fuel injection pump solenoid terminal.
  2. Disconnect glow plug wiring, and remove all glow plugs. Use compression gauge (J-26999-10) to test individual cylinders.
COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio
2.2L 21.0:1
6.2L 21.3:1
Compression Pressure
2.2L
Standard 441 psi (31 kg/cm2 ) (1)
Minimum 398 psi (28 kg/cm2 ) (1)
6.2L 300 psi (21 kg/cm2 )
Max Pressure Variation - 6.2L 20%
(1) Measured at 200 RPM.