Hi,
Our old Yamaha 3.5AC's gearbox oil goes milky after 10 minutes running in the test tank. but only if the prop is turning (10 minutes in neutral results in no milkiness). We are therefore assuming that the water ingress is via the prop shaft (there is no other way in for the water that is rotation dependent). We have installed a new seal and bearing but milkiness continues. Is the culprit leakage, under vibration, around the outside of the seal or the slight wearing of the prop shaft counterface or something else?
If it is the shaft wear, is a speedi sleeve likely to be successful instead of a new shaft ?
We have pressure tested and all seals retain quite high pressure but then, our problem is ingress of water not egress.
Any advice gratefully received.
Bob
Our old Yamaha 3.5AC's gearbox oil goes milky after 10 minutes running in the test tank. but only if the prop is turning (10 minutes in neutral results in no milkiness). We are therefore assuming that the water ingress is via the prop shaft (there is no other way in for the water that is rotation dependent). We have installed a new seal and bearing but milkiness continues. Is the culprit leakage, under vibration, around the outside of the seal or the slight wearing of the prop shaft counterface or something else?
If it is the shaft wear, is a speedi sleeve likely to be successful instead of a new shaft ?
We have pressure tested and all seals retain quite high pressure but then, our problem is ingress of water not egress.
Any advice gratefully received.
Bob
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