gmc Workshop Repair Guides

GMC C 2500 Truck 2WD V8-379 62L Diesel Workshop Service and Repair Manuals

Valve Clearance > < Number 1 Cylinder Location
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Compression Check: Specifications

2068 kPa (300 psi).  
Perform compression test with engine at normal operating temperature, glow plugs removed and throttle wide open.

Valve Clearance > < Number 1 Cylinder Location