Perkins 415GM - How to Check the Impeller of the Raw Water Pump - 4.4 GM, 4.4 TGM, 4.4 TWGM & 4.4 TW2 GM

Chapter 4 N39453
Page 76
How to check the impeller of the raw water pump - 4.4GM, 4.4TGM, 4.4TWGM &
4.4TW2GM
1. Ensure that the seacock is closed.
2. Release the four setscrews which fasten the end plate of the raw water pump and remove the plate.
When the end plate of the raw water pump is removed, some raw water will ow from the pump.
3. Remove the rubber end cap (VV1) and then pull the impeller from the shaft.
4. Clean the contact surfaces of the pump body and the end plate.
5. Inspect the rubber impeller for excessive wear or for damage and renew it, if necessary. If pieces have
broken off the impeller blades, it is necessary to remove them from the system to avoid damage later.
6. Remove the outlet hose from the raw water pump. Remove any debris and check for broken pieces of
impeller blades.
7. Fit the outlet hose to the raw water pump and tighten the hose clips. Replenish the coolant circuit.
8. Apply Spheerol SX2 grease or liquid soap to the blades of the impeller and t the impeller into the housing
with the blades bent counter-clockwise (VV). Fit the rubber end cap.
9. Renew ‘O’ ring seal if necessary. Fit the end plate making sure that the ‘O’ ring remains seated in the
groove and tighten the end plate screws.
10. Open the seacock.