Generac — Oil Pan Removal and Installation

Repair & overhaul

From a Generac service manual covering: CAC478, CAC480, SQR480. Check it applies to your exact model before use.

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Procedure

1. Loosen the drain plug and drain oil.
2. Loosen eighteen M6×20 bolts.
3. Take out the sealing gasket of the oil pan.
4. Check that left and right reinforced plates are clipped on the back face of the oil pan flange.
5. Apply Loctite 598 and GY409 anaerobic sealant on the joint between oil pan flange, oil pump case and rear oil seal carrier.
6. Put the new rubber seal gasket on the cylinder block with both sides entering the grooves of the rear oil seal carrier and oil pump.
7. Install the oil pan with the two sides of the sealing gasket in the oil pan grooves.
8. Screw the bolts by hand (bolt with washer first).
9. Tighten bolts to 53 in-lbs in the sequence shown.
10. Replace the drain plug sealing gasket, screw in the drain plug by hand and tighten to 17 ft-lbs.

Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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