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superduke forum • View topic - Oil leak under water pump housing

Oil leak under water pump housing

problems . solutions . product reviews . tips
druu
Minimoto racer
 
Posts: 17
Joined: Wed Jan 01, 2014 6:07 am
Location: Perth, Australia

Oil leak under water pump housing

Postby druu » Wed May 30, 2018 12:56 am

I've had this a few times, oil will develop under the water pump housing. When this happened last time I replaced the water pump gasket and it came good (!) but there was no sign of oil in the water. Has anyone had this happen? I feel like it might be coming out of one of the bolt holes?

I'm going to order another water pump gasket, but any idea why this would be happening? Any help appreciated, thanks.

druu
Minimoto racer
 
Posts: 17
Joined: Wed Jan 01, 2014 6:07 am
Location: Perth, Australia

Re: Oil leak under water pump housing

Postby druu » Mon Jun 04, 2018 3:32 am

Nobody?

User avatar
RichUK
Two wheeled terror
 
Posts: 340
Joined: Sun Oct 23, 2016 5:46 pm
Location: England

Re: Oil leak under water pump housing

Postby RichUK » Mon Jun 04, 2018 8:41 am

Which bike is this on?

I'm struggling to imagine how oil could make it's way out through the water pump as the pump is integral to the engine casing.
If it really is coming from there then the bolt hole would be a more likely candidate.
When you pull the bolts to change the gasket the bolt will show you if it has been allowing oil to pass. If it's dry then it isn't the problem, but as the oil isn't pressurized I'd be surprised if oil will make it's way passed the threads once tightened, which leads me to believe that your oil leak is coming from higher up the engine.

Before dong any of this I'd super clean and dry the engine, blow it with chalk dust, run the engine and watch it with a bright torch. The oil track should reveal itself.
If nothing shows then go for a ride and then inspect again.

druu
Minimoto racer
 
Posts: 17
Joined: Wed Jan 01, 2014 6:07 am
Location: Perth, Australia

Re: Oil leak under water pump housing

Postby druu » Mon Jun 04, 2018 9:24 pm


User avatar
RichUK
Two wheeled terror
 
Posts: 340
Joined: Sun Oct 23, 2016 5:46 pm
Location: England

Re: Oil leak under water pump housing

Postby RichUK » Mon Jun 04, 2018 10:04 pm

If yours is anything like mine then oil leaks around the engine just seem to come & go.
Last one was from the RHS of the rear cylinder cam cover, leaked when first brought out of winter storage, just for 2 rides and then stopped.
I tend not to worry too much about things like that now.

druu
Minimoto racer
 
Posts: 17
Joined: Wed Jan 01, 2014 6:07 am
Location: Perth, Australia

Re: Oil leak under water pump housing

Postby druu » Tue Jun 05, 2018 10:32 pm


User avatar
RichUK
Two wheeled terror
 
Posts: 340
Joined: Sun Oct 23, 2016 5:46 pm
Location: England

Re: Oil leak under water pump housing

Postby RichUK » Wed Jun 06, 2018 8:06 am

Pull the bolts to inspect them one at a time, that way you don't have to break the gasket/drain the system.

If you find the bolt that is allowing oil past then de-grease as best you can and use some mild thread lock on that bolt, or even silicone sealant.

druu
Minimoto racer
 
Posts: 17
Joined: Wed Jan 01, 2014 6:07 am
Location: Perth, Australia

Re: Oil leak under water pump housing

Postby druu » Fri Sep 27, 2019 10:15 pm

Just an update on more findings.

I got around to an oil change and decided to get a new RHS engine case gasket and replaced it. Oil pump gasket was also done and seated nicely. Still, the oil leak is there!

I’ve confirmed that it’s coming from the lower-left bolt on the water pump housing, an ungasketed area between the housing and the engine case. This part uses a dowel guide to locate the water pump housing. It’s as though oil is blowing through the crankcase, into this hole and forcing oil out from this spot!

What would cause excessive crankcase oil pressure? Perhaps I have a blocked breather or something?

Any advice welcome.


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