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Old 31-03-2010, 06:39   #1
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Water in Gearbox !

I was changing out the oil in my Yanmar 2GM gearbox and was horrified to see about twice the proper quantity, and a murky light brown colour. We had an incident a few months ago where the poor old tub shipped quite a bit of water while we were away, and I reckon it's found its way into the transmission - I guess there is a breather on it somewhere. I can't think of any other way it could have got in there.

I put in new oil, and plan to renew it a few times over the next month or so. Is there anything else I can do to minimise the corrosion? I was thinking of doing a longish run so that it warms right up, and leaving the dipstick for a while out so that any residual water can evaporate out.

Any ideas gratefully received!

lockie
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Old 31-03-2010, 08:04   #2
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lockie, if you have a transmission cooler, that may have failed, but the Yanmar usually does not have one. Yes you need to flush the transmission several times, but NOT under way. I would first flush with perhaps kerosene or diesel, drain and dry, add fluid, run it in gear enough to circulate the fluid, drain and continue adding fluid and draining until no signs of water. It may take several attempts. Then run it for a SHORT period of time and check the fluid for bubbles. If they are present you still have some water. WG
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Old 31-03-2010, 08:24   #3
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I got seawater in mine by way of the lower seal taking heavy splash from the packing gland on a very long leg.
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Old 31-03-2010, 11:13   #4
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And I lost fluid from my Yanmar transmission because the O-ring on the filler went away. That loss, I'm sure, can also allow water in.
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Old 31-03-2010, 15:18   #5
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Old 31-03-2010, 16:41   #6
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there is a vent drilled in the dipstick tube. This as well as a bad seal will let in water. Was the trans submerged?

If you can, I'd pull it and disassemble it for a through cleaning from the salt water.
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Old 01-04-2010, 00:13   #7
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The water got in a couple of months ago. Does anyone know of an anti-corrsion product that might help?
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Old 09-04-2010, 00:44   #8
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Update:

Flushed a few times with oil, then with kerosene, then filled with 10/40W oil, seems to be doing well.
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