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Old 19 May 2012, 11:04   #1
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Gearbox leak??

I've drained the oil from the gearbox of my evinrude 150DI and it's come out emusified and black smells a fair bit too

I haven't a clue what was used in it at the last service, so got no idea what colour the original oil used was. It's been in there two years and about 50 hours of use.

Anyway, I'd like to pressure test the gearbox and can lay my hands on a manometer to do this. What sort of pressure can I pump in there to give it a good test? I thought 3-5psi?

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Old 19 May 2012, 12:29   #2
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5psi is the test pressure for erude gearboxes. Remove the prop & check for fishing line around the prop shaft & check the oil seal for leaks.
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Old 19 May 2012, 13:12   #3
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Not as bad as first thought. The discolouration isn't uniform and might well be some form of sludge. I've managed to mix the lighter stuff into the black and I've decanted a quantity into a jam jar to see if it settles.

Here's a photo as it was coming out the box.
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Old 19 May 2012, 14:34   #4
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Doesn't look that bad Andy. Which oil are you putting in? Evinrude gearbox oils are designed to emulsify & bind the water up in the oil rather than letting it settle out. IIRC the HPF pro can hold upto 20% water by volume & still offer full protection to the gearbox.
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Old 19 May 2012, 14:54   #5
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Its not an Evinrude oil but a Quicksilver Hi Performance gear oil which I was told by my local dealer is what he uses in all gearbox oil changes and is the same stuff as used in etecs and is red in colour and much thinner than came out the gearbox.
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Old 19 May 2012, 14:56   #6
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This stuff is good for finding if you have water in oil and fuel http://www.oilybits.com/water-remova.../prod_149.html
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Old 19 May 2012, 15:36   #7
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That's clever!
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