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Old 09-05-2017, 10:16 AM   #6
koliver's Avatar
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 3,251
Originally Posted by Sagdito View Post
I have a very small oil leak coming from my fresh water pump on one of my Cummins 6BTs, now how can this be, as I would have thought there is only cooling water anywhere near the pump. Its coming from the base of the pump where it bolts onto the block.
Any ideas

If you have oil leaking past the seal on your pump shaft, be aware that if the water pressure exceeds the pressure of the oil, water will be leaking past that seal into the sump, potentially causing a failure that will be much more serious than simply replacement of the seal.
This failure is not uncommon on engines with a gear driven raw water pump, as yours seems to be.
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