savvybt

I searched the forums and couldn't find anything like this. I have oil leaking from the intake manifold. It is from the bottom rear of the manifold where one of the varioram vacuum units attaches.

http://www.flickr.com/photos/30439538@N03/

It appears that oil is getting into the manifold and then leaking out from the lowest point? How would oil get into the location? My oil consumption has gone up recently so I presume it is being pulled into the engine and burning as there are only a couple of drops on the garage floor. Any ideas where the oil could be coming from? Hopefully this is something that can be repaired without having to pull out the varioram components.

Thanks

NP993

Fascinating! I have the exact same problem, and thought I must be the only one. Very curious to know what's happening here...

guards red

Most engines will have some oil in the inlet, this will vary on how full you keep the oil tank, over filling will result in more. Never seen one completely without oil.

The actuator you have photographed if for the resonance flap. The flap is a butterfly valve in the manifold and is suspended in place via a rod that passes through a seal and onto a cranked arm which in turn is moved by the vacuum operated actuator. This system is at the lowest part of the manifold (other than the runners) and oil collects around this part. If the seal that the rod passes through is leaking oil linning the inside of the manifold will escape.

It looks to be just "wetting" the actuator mount, I'd just clean it and see how long it takes to get gunked up again. At worst it will be a minor air leak into the manifold bypassing the throttle but nothing to get too worried about. Changing the seal is a manifold out job and probably not worth the effort at this stage.

Just a humble opinion of course.

GR

savvybt

Thanks that makes sense. I cleaned it off and will see how it looks after 6 track days I have coming up. That should be a good test.

Akerlie

Found i have the same issue when i removed my alternator for an overhaul.
Thank you for a calming answer GR

vanHunks

I have the same condition and as the engine is out will have a look at replacing the seal.

mschafer71

Oil Leak - base of intake manifold...? - Rennlist Discussion Forums

https://rennlist.com/forums/993-foru...-manifold.html

mschafer71

Oil Leak - base of intake manifold...? - Rennlist Discussion Forums

https://rennlist.com/forums/993-foru...-manifold.html

mschafer71

https://rennlist.com/forums/attachme...1&d=1449557996

#25

pp000830

When I replaced the actuator it was dusty with oil coating to it. Seems to me that after 18 years or so the amount of oil weeping is negligable and a quick shot of electric motor cleaner should hose it off and its good to go for another 10 year or so. May be time to replace the actuator anyway.

axl911

Contrary to popular belief, the manifold IS usually coated with oil. This is because oil vapors are sucked into the manifold from the engine and oil tank. The manifold will be coated with oil.

What you have there is simply oil pooling at the lowest point and leaking out of an old gasket. Change the gasket. Don't bother cleaning inside the manifold.

pp000830

[QUOTE=axl911;Change the gasket. Don't bother cleaning inside the manifold.[/QUOTE]

Seems this is not so easily done as just replacing the actuator without removing the manifold was time consuming.
Andy