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Lower unit oil

I need to change the oil in my lower unit on a 40 hp yamaha outboard motor

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On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps

Posted on Jul 10, 2010

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