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Old 06 January 2015, 11:02   #1
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Gearbox oil change

1970 Evinrude 6hp Fastwin. I am currently letting the oil out of the gearbox and wondered should I run some "detergent" oil around it first, before filling it again? Do you have any other methods of exchanging the oil?

Thanks Andy
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Old 06 January 2015, 12:57   #2
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It doesn't hold much oil. If what came out is bad, run it for a trip, then change it again. If it is still bad, do it all over again, until it comes out clean.
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Old 07 January 2015, 04:01   #3
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Is the gear oil milky white? If so it could be water ingression which needs to be sorted.If its a cream colour just re-fill the gear housing, and if it hasnt been changed for a long time it will smell bloody vile, and usually drains out coloured black.Only use marine gear oil, NOT automotive gear oil .
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Old 07 January 2015, 04:07   #4
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Thanks to you both. No water ingress and yes got some marine gearbox grease/oil.
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Old 07 January 2015, 06:00   #5
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uncle al, could you explain to me why not to use automotive oil?? Since I was thinking about doing this in the near future.
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Old 07 January 2015, 06:41   #6
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This is the oil I will be using
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Old 07 January 2015, 09:46   #7
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otilly the reason is, marine gear oil is formulated in such a way that it sticks to the g/h parts ,and if there is any water ingression then it is supposed to keep the water away from the g/h parts.Thats the theory anyway, Automotive oil doesnt do that.
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