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Old 11 February 2019, 05:21   #1
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Gearbox input shaft seal slight weep....Thoughts

We've been watching the gear box oil over the last three years. Last year there was a tea spoon of milky oil at the bottom plug...This year its two tea spoons of milky oil....so we decided to have the seals replaced. Mr fix it said the main leak was from the output(prop) shaft seal. He's replaced it and its fine.... There was a very slight leak from the input shaft seal which he's replaced but it still leaking very slightly from there....Thoughts? What are my options??? Nik
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Old 11 February 2019, 15:13   #2
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We've been watching the gear box oil over the last three years. Last year there was a tea spoon of milky oil at the bottom plug...This year its two tea spoons of milky oil....so we decided to have the seals replaced. Mr fix it said the main leak was from the output(prop) shaft seal. He's replaced it and its fine.... There was a very slight leak from the input shaft seal which he's replaced but it still leaking very slightly from there....Thoughts? What are my options??? Nik
leaking water in or oil out?
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Old 11 February 2019, 15:46   #3
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leaking water in...
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Old 11 February 2019, 15:53   #4
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I'm going to guess the shaft is worn. Might be possible to move the seal slightly or get one with a different profile so as the lip bears on a different bit of the shaft.
However, two teaspoonfuls of milky oil doesn't sound that bad and it might be easier just to schedule a couple of extra gearbox oil changes through the season to see how it's going.
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Old 11 February 2019, 16:06   #5
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theres a company called crs that does a thing called a shaft saver to repair worn seal journals I don't know if they do them in stainless but either way any engineering place should be able to rattle them of a lathe no probs
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Old 11 February 2019, 16:26   #6
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....There was a very slight leak from the input shaft seal which he's replaced but it still leaking very slightly from there....Thoughts? What are my options??? Nik
How do you know it's leaking from there?
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Old 11 February 2019, 16:32   #7
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Plug seals been changed plugs ok just saying
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Old 11 February 2019, 16:54   #8
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I think its to hold 15psi for 10 mins.It was pressure tested after assembly, I presume they used a bottle of soapy water spray.
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Old 11 February 2019, 17:25   #9
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I've just reviewed the parts diagram for my Tohatsu M60C. When I've replaced the impeller (every two years), and the gear oil annually there was a little emulsification. Nothing to worry about unecessarily, but more of a niggle as there's water ingress somewhere.

I've replaced the fibre drain and fill plug washers last year so I know they are good. Just ordered parts, including waterpump gaskets, and importantly the 'o' rings on the dog clutch and the 'o' ring under the water pump to the driveshaft bearing.

Not even looking at the prop shaft seals, as that's a different ball game to access.
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