Milky gear oil

[Tommy c]

......is it all one part???
I'm wanting to get the propeller shaft oil seals out to replace with new.

[Matt]

Mmm. This is the problem - I know how my Johnson goes together - but it's different to your yammie. On the Johnson, because I could - I warmed the housing up enough to drop the bearing out and could then punch the oil seals out from behind...

[Tommy c]

Now it's cleaned up, it looks like it's all one part.
It's now soaking in wd40 to release the bearing from its race.
And looking from the outside in, there's definitely some corrosion around the seals.
Hopefully once I can get the bearing out and a pair of new seals fitted, the water ingress should be sorted, fingers crossed

[Matt]

WD won't help, I am sure. A bit of heat will be needed.

[Tommy c]

I put a bolt upside down through the outside of the prop shaft hole and got the bolt head between the seal and the bearing and it tapped out with ease, 4 taps actually.
On the outside of the housing cap are 2 holes, 1 each side opposite each other. A thin nail fit through and tapped the 2 seals out.
There's definitely signs of salt where the seals have been.
Just need to source a pair of seals now

[Matt]

Excellent.

[Tommy c]

Is there a particular way round for these seals to be fitted?
Thanks

[beamishken]

Originally Posted by Tommy c

Is there a particular way round for these seals to be fitted?

Thanks

Outer seal faces out to keep water out inner seal faces in to keep oil in, a good waterproof grease packed between them

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[Tommy c]

Originally Posted by beamishken

Outer seal faces out to keep water out inner seal faces in to keep oil in, a good waterproof grease packed between them

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Just found this diagram for the 5hp 5c, would you say they are both facing the same way

[Matt]

Good find, I was looking for a diagram for you earlier that showed you the orientation.

[Tommy c]

Would you agree they both face the same way looking at that diagram?
I youtubed a few videos and like Beamish Ken said they was showing 1 one way for the water and the 2nd the other way for the oil but then I saw a danger marine video and one he was doing after he checked they were both the same way

[Matt]

I'd follow the parts diagram/service manual for your motor - which does appear to explicitly show them both pointing the same way - although in the absence of that, i'd have mirrored what was in there already, and in the absence of that, I'd have done it as ken suggests, which is the other way.

[beamishken]

Here's a couple of pics of mercury bravo 3 drive seals which come assembled as a pair & you can see they are assembled as I suggested earlier one in & one out. Clearly mercury think thats how they should go maybe yamaha do things differently idk🤷*♂️ flip a coin 😉

[Matt]

Logically, I agree. But all the yammie 5hp gearbox parts diagrams do explicitly show it as per Tommy's pic - from 1984 up to 2002 at least. So, what does he do? Both options are wrong!

[beamishken]

Originally Posted by Matt

Logically, I agree. But all the yammie 5hp gearbox parts diagrams do explicitly show it as per Tommy's pic - from 1984 up to 2002 at least. So, what does he do? Both options are wrong!

I think the fact different manufacturers do things differently probably suggests its not that critical but I'd probably prefer to go with the same way they were installed from new, apologies for the misleading info.
I have done a couple of those boxes but dont remember which way they came out as it was a while ago now but I do a few merc drives & knew that was how they manufactured their seals.

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[Limecc]

Just to confuse

There's a pressure side (spring side) and non-pressure side (outer face)

Want to keep water out of oil or grease? Then spring side to water. Want to keep oil or grease in? Then spring side to the oil.

[beamishken]

Originally Posted by Limecc

Just to confuse



There's a pressure side (spring side) and non-pressure side (outer face)



Want to keep water out of oil or grease? Then spring side to water. Want to keep oil or grease in? Then spring side to the oil.

Nothing confusing in what you say which is exactly how I said the seals should go & how the mercury combination seals are that I posted pictures of are manufactured. However the page from the manual for this engine that was posted shows both seals with the springs in the same orientation, pointing towards keeping the oil side but not dealing with the water side.

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[Limecc]

Originally Posted by beamishken

Nothing confusing in what you say which is exactly how I said the seals should go & how the mercury combination seals are that I posted pictures of are manufactured. However the page from the manual for this engine that was posted shows both seals with the springs in the same orientation, pointing towards keeping the oil side but not dealing with the water side.

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So it's clear the Mercury drawing is incorrect.

[beamishken]

Originally Posted by Limecc

So it's clear the Mercury drawing is incorrect.

No idea if the drawing is wrong or not, its a Yamaha manual so perhaps Yamaha have a different idea to mercury about how seals should be installed

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[Tommy c]

I've fitted them now so I'll keep my eye on it after every use. It's only a tenner for the pair so if they don't work facing both the same, I'll get another pair and fit them opposite.
They are only single lip seals so if I fit the 2nd pair in the future would you put the lips facing together or lips away?

https://www.marineengine.com/parts/m...using-assembly
This is the site I got the parts diagram from

I've got all the water jacket to clean out now and replace the jacket gaskets and thermostat