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.
1983 Chevrolet Step Van P20, 4.8 T, Automatic, 475/M40FACTORY OEM SERVICE PROCEDURE
Installation (Van)
- Install injection pump gasket. Position cylinder No. 1 at TDC by lining up crankshaft pulley mark with indicator. Align locating pin on injection pump hub with slot in injection pump driven gear. At the same time, align injection pump timing marks. See Figure.
- Attach injection pump to front cover. Alignment marks made during removal must be aligned. Tighten nuts. Attach pump to drive gear and tighten bolts.
- To complete installation, reverse removal procedure. Check timing and perform on-vehicle adjustments, if required.
Factory Service Tools
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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.
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