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  #1  
Old 25th July 2010
groovemeisterus's Avatar
groovemeisterus groovemeisterus is offline
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Question Oil Leak from Exhaust port?

Any one have any ideas why oil would leak from the exhaust port?
This is from the front header. My heads were ported by branch,
and I am running bob woods 0.590" prowler cams.

Should I have used roller rockers? Could this be the valve stem wear?
I checked and it is not the head gasket leaking.

This is a picture of the head bolt with oil ready to drip.



Thanks for any ideas, getting ready for sturgis and need to get taken care of.

It looks worse, but I cleaned it, checked the exhaust gasket, and replaced, then
it started to leak again but not as bad.

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  #2  
Old 25th July 2010
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Ported into an oil passage? How does it run? If it runs ok I'd guess the nicked apassage while porting. If it runs like crap, rings?
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  #3  
Old 25th July 2010
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groovemeisterus groovemeisterus is offline
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Heads have been ported for over 2 years and the problem just started showing
up last week. Wear and tear maybe from riding it hard? Still runs like a champ though.

Could valve guides or valve guide seals be considered? I looked into the
plug holes with a light and the piston tops don't seem to be black or all
carbon built up, but spark plugs seem way to black.

Thanks for the feedback.

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  #4  
Old 27th July 2010
laneappliance laneappliance is offline
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is the pipe full of oil as well? i would think valve seals. but that would not make combustion chamber look rich so back to rings. you can do a compression check for that. does bike smoke it could also be intake side valve seals but those will smoke alot.
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Old 27th July 2010
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Could there be a crack in the stud hole that is allowing oil to seep out?
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Old 27th July 2010
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Quote:
Originally Posted by laneappliance View Post
is the pipe full of oil as well? i would think valve seals. but that would not make combustion chamber look rich so back to rings. you can do a compression check for that. does bike smoke it could also be intake side valve seals but those will smoke alot.
I didn't notice any oil in the pipe, but I could take a closer look.
When looking in the exhaust port is was a grayish color but dry and not oily.

Bike does smoke some on startup but does go away after warmed up.

I will try a compression check.

Thanks for your feedback!

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  #7  
Old 27th July 2010
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Quote:
Originally Posted by Spadesluck View Post
Could there be a crack in the stud hole that is allowing oil to seep out?
the stud hole as in the stud used to bolt the exhaust to the head?

Thanks for your feedback!

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  #8  
Old 28th July 2010
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Quote:
Originally Posted by groovemeisterus View Post
the stud hole as in the stud used to bolt the exhaust to the head?

Thanks for your feedback!

Yes, I do not know if it is possible but it is something to look at. Are you sure its not dripping down from the rocker covers? Another possibility could be the head gasket itself is leaking right there.
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Old 28th July 2010
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Back up the picture. I think the source may be elsewhere.
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Old 28th July 2010
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I suppose a bad exhaust valve seal could set the conditions for having oil in the port, but I still don't see how it would leak out onto the stud instead of going down the pipe unless you had an exhaust leak too. I would look to the rocker box personally.
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