General Motors — Servicing Raw Water Pump Impeller
Maintenance
From a General Motors owner's manual covering: Carb 5.7L, MP 5.0L, MP 5.7L, MP 6.0L. Check it applies to your exact model before use.
Procedure
- The raw water pump impeller should be serviced every 50 hours, or once a year, whichever occurs first.
- Locations A are access holes to loosen the raw water pump housing attaching bolts.
- Remove and replace the impeller.
- Torque the raw water pump housing attaching bolts to 8.5-9 ft.lbs. (11.5-12 N-M) when re-installing the impeller.
Specs & values
- IMPELLER KIT #: RP061022 Amazon eBay $15.99 FridayParts $40.99
- Housing attaching bolts torque: 8.5-9 ft.lbs. (11.5-12 N-M)
Source: General Motors owner's 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.