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Old 17-06-2016, 02:37   #16
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Re: Header Tank To Eliminate Saildrive Salt Water Intrusion

I read that viton seals are only needed for hotter temperatures and I cant see something that has so much water cooling it continuously will ever get to any significant heat. I used the stainless springs from the old seals on the new outer seals, but I guess O rings would also work well.
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Old 18-06-2016, 00:10   #17
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Re: Header Tank To Eliminate Saildrive Salt Water Intrusion

If one goes the header tank route should one consider reversing the seal to keep the oil in rather than the water out?


Years ago I considered getting rid of the cutlass bearing and prop shaft gland and replacing them with opposed tapered roller bearings in an oil filled stern tube with a header tank to keep the seals pressure activated. It was doable and I found a couple of boat owners who had done it successfully however I gave up the idea when they warned me that it did cause noise from transmitted vibration from the prop. Had I implemented it I would have set the seals to keep the oil in rather than water out.
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Old 25-06-2016, 10:20   #18
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Re: Header Tank To Eliminate Saildrive Salt Water Intrusion

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Originally Posted by Privilege View Post
Do these tanks have an overflow outlet? If they are completely sealed they might not work as suggested. The idea as I understand it is that as the oil cools and contracts it creates a vaccum which helps the sea water to enter. A hole drilled in the cap would alleviate the problem.

Good find though. I think I'll order two also.
The mini-moto fuel tank that I used has a cap vent. I pushed on a length of 8mm plastic pipe and used a tywrap to form a coil. That way the tank is always at atmospheric pressure. If the oil heats up it can expand into the tank but there is always a 1-2ft head of oil to ensure that no seawater comes into the gearbox.
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Old 25-06-2016, 11:51   #19
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Re: Header Tank To Eliminate Saildrive Salt Water Intrusion

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Originally Posted by tunnelvision View Post
I just ordered 2 of these to do my sail drives. Dorman - 603-001 - Universal
These worked perfectly with a small hole drilled in the cap. Now I can see at a glance if the oil level is correct.
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