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.
1985 Chevrolet Step Van P20, 7.4 W, StandardFACTORY OEM SERVICE PROCEDURE
Bottom Cover Replacement
- Using hand or power tool, remove bottom cover by making shallow, close cut to bottom outside edge.
- Remove insulation and check inner shell for damage. If damage is found, entire converter must be replaced.
- If no damage is found, position new insulation into replacement cover. Apply Sealer (8998245) around edge of cover, using extra sealer at front and rear pipe openings.
- Install replacement cover on converter, and position retaining channel along edges. Complete the installation by attaching clamps (provided with replacement cover) to both ends of converter.
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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