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 MANUALSGMC1983PICKUP C1500, 6.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400COMPONENT DISASSEMBLY & REASSEMBLYOIL PUMPDISASSEMBLY
1983 GMC Pickup C1500, 6.2 C, Standard
Oil Pump: Disassembly
1983 GMC Pickup C1500, 6.2 C, StandardSECTION Disassembly
- Compress regulator boost valve bushing against pressure regulator spring. Carefully remove snap ring.CAUTION: Pressure regulator spring is very tightly compressed.
- Remove regulator boost valve bushing, valve and pressure regulator spring. Remove regulator valve, spring retainer, and spacer(s) (if present). Remove 5 pump cover attaching bolts noting different lengths and positions. Separate cover from body. Mark drive and driven gears for reassembly reference and remove from pump body. See Figure.
- Reassembly of pump gears in same position will ensure quietest operation. Remove retaining pin and bore plug from end of regulator bore. Remove 2 oil seal rings from cover. Remove pump-to-forward clutch housing thrust washer.
RENDER: 1.0x
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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.