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Old 14 January 2013, 11:11   #1
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Country: UK - England
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Lower Gearbox Oil

Hi
Anyone know how much oil in prop drive gearbox, is it over a litre. On a 75 hp mariner engine built about 2004, 2 stroke
Ideas on type would be helpful
Many thanks Stuart
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Old 14 January 2013, 11:31   #2
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About 9 oz (US) so roughly 0.25L. 80w-90 is a typical weight. Brand doesn't matter much, esp in these older engines. If you go to the store don't get the one use tubes. Get a slightly larger (liter?) and the pump to actually push it into the housing. And the gaskets for the bungs.
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Old 14 January 2013, 12:18   #3
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Could be wrong, Jack, but that seems a little short. I seem to recall (have to check to be sure) that my F115 takes about half a quart, so closer to a half liter (rather than your quarter liter.)

OK; Yam's manual says 25 US Oz, just shy of a quart. Don't know what length shaft that was for, but can't be that different, can it?

jky
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Old 14 January 2013, 13:20   #4
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Quote:
Originally Posted by jyasaki View Post
Could be wrong, Jack, but that seems a little short. I seem to recall (have to check to be sure) that my F115 takes about half a quart, so closer to a half liter (rather than your quarter liter.)

OK; Yam's manual says 25 US Oz, just shy of a quart. Don't know what length shaft that was for, but can't be that different, can it?

jky
I guessed that the OP's 70hp had a comparable sized gearbox to my F60. I didn't think they were making "big foot" (or whatever they are called) oversized gearboxes back then. And seems like most 50/60/70 hps have the same sized legs. 90/100/115hp legs seem to be the next size up. I buy gear oil by the quart and it seems to last about 3 changes, but I end up dripping alot in the process.

Ok edit I looked my Yam F60 up, 14 US oz = 0.4L
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Old 14 January 2013, 15:11   #5
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ok thanks for info

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Old 14 January 2013, 15:13   #6
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I cant remember the exact amount but i thought it was about 1ltr on those. I personally would use Quicksilver High Performance oil. Its better than the premium stuff and the same price.
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Old 14 January 2013, 16:33   #7
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Quote:
Originally Posted by captnjack View Post
80w-90 is a typical weight.
Are you just running regular automotive type gear oil? Which GL rating are you using?
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Old 14 January 2013, 19:54   #8
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Are you just running regular automotive type gear oil? Which GL rating are you using?
No, I just use the Yam stuff which is 75 or 80-90w. Mercury's and Johnson's are similar. I don't know the GL rating but I figure I so infrequently change it that worth the $1.50/quart more to use the "marine" brand stuff which just might have different additives or water dispersents specific to lower units.

Edit: Yam's is GL 4 and 5 according to the bottle:
http://www.yamaha-motor.com/yamalube...#productscroll
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