Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1983SPORTVAN G10, 5.7 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 6.2L V8 DIESEL VIN [J]ENGINE MECHANICALENGINE COMPRESSION
1983 Chevrolet Sportvan G10, 5.7 L
Engine Compression
1983 Chevrolet Sportvan G10, 5.7 LSECTION Engine Compression
NOTE:
Prior to checking compression, be sure battery is fully charged to avoid battery run down. When turning engine over during test, 6 "puffs" per cylinder should be used to obtain reading.
- Remove air cleaner and install screen cover over air crossover. Disconnect electrical wire from fuel injection pump solenoid terminal.
- Disconnect glow plug wiring and remove all glow plugs. Use compression gauge (J-26999) to test individual cylinders.
CAUTION:
DO NOT
add oil to cylinders during compression check as extensive engine damage will result.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | 21.5:1 | ||
| Compression Pressure (Min.) | 275 psi (19 kg/cm) | ||
| Max. Pressure Variation | (1) | ||
|
|||
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.