Cummins/Onan 6GO — Water Pump Dismantling

Repair & overhaul

For the Cummins/Onan 6GO, from the Cummins/Onan operator's manual.

Applies to: Continental Red Seal Y91-273 or Y91-264 engine

Procedure

1. Remove the nut and lockwasher from the front of the water pump shaft and pull the pulley off the shaft with a suitable puller.
2. Remove the three nuts mounting the shaft support to the body and remove the support assembly.
3. To remove the impeller, remove the set screw and pull or press the impeller from the shaft.
4. To remove the shaft and bearings from the support, remove the set screw from the top of the support and press the assembly out through the front.
5. The seal will be found assembled in the impeller hub; take care as the carbon seal is fragile.
6. To reassemble, reverse the disassembly procedure; make sure the set screw lines up the impeller on the shaft and press the impeller on flush with the end of the shaft.
7. Pack the space between bearings with a good grade of water pump grease.

Source: Cummins/Onan operator'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.

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