Head leaks

[Robert Sanchez]

I need some advice for a 930 !!!!!!!!!!!!!!!!!!
It looks like I have oil leaks between the camshaft housings and the heads. I am thinking on pulling the engine out to correct this problem. The car has about 20,000 Kms. and was stored for 10 years. Is their any other seals, parts or gaskets to be changed now that the engine is out? What other type of work should be done at this time?

Thanks for any input....

[Porsche_monkey]

Done a compression test?

Got 'the book'?

[smestas]

Id open up the valve covers to see if the source of the leak isnt comming from the rocker arms.

[Wayne 962]

Get a copy of the Engine Rebuild Book: http://www.101projects.com - too much info to list here...

-Wayne

[Robert Sanchez]

The compresion is OK on all 6 and the leak is not coming from the valve cover. I do have a copy of the Wayne´s engine rebuild book and I plan to use it in my project.
I just wanted some educated guess on what should I change now that the engine will be down to prevent leaks or things going bad in the near future.

[afterburn 549]

I do supose you mean oil leak between the head and the rocker boxes??? if so that would not equal a compete tear dwn......to my knowledge there is not a gasket there (unless a 930 is diff from n.a.) I think the big deal is to positivly id it so you do not do a bunch of extra stuff.

[Jeff Alton]

There is no gasket between the heads and the cam housing, just some loctite sealer. Simon was not refering to the actual valve cover. He was refering to the rocker shaft itself. They can and do leak where they seal into the cam housing. It is a shaft that has a pressure fit. When the bolt that goes through this shaft is tightened upon installation, it expands the ends of the shaft to seal it the camshaft housing. This is a fairly common leak and there are now rubber seals to help solve this problem. If this is where your engine is leaking, It can be repaired with the motor in the car.

Cheers, Jeff

[smestas]

Originally posted by catca
Simon was not refering to the actual valve cover. He was refering to the rocker shaft itself.

Yup! That is what I was refering to. If the shafts leak from there it can give the apearance that the cylinder to head surface is leaking oil.

[Robert Sanchez]

Thanks to Simmon and Jeff and the others for your input. I checked again and I can see a small oil leak coming from the rear side of the camshafts. Their is an o-ring seal and a gasket that I need to replace. After runing the car for 10 minutes I see small drops forming in the joint between the head and the camhousing. Yes I looked it up and it does not use a gasket. It uses 574 loctite.
Do you all think that correcting the camshaft leak by changing the gasket and the seal on the rear side without removing the engine should do the trick?

[Jeff Alton]

Robert, are you referring to the o-ring and gasket for the camshaft thrust plate? The one yu get at throught the timing chain box? If that is the one it may help.

If you have a digital camera, snap a pic and post it and let us see the leak.

Cheers, Jeff

[David]

Is it actually leaking on the ground? Not just a drop a week but a couple of drops a day? If not, you could do a compression check and leakdown to check the engine condition and put the car on jack stands and power wash the bottom of the engine. Then you'll have a good idea where the leak's coming from and you'll be able to drive the car awhile in the meantime.

[Robert Sanchez]

Yes Jeff, that the o-ring and the gasket.
It leaks a couple of drops after I use the car and I can see some smoke from the oil burning then I start the car and after a few minutes reaches operating temps. Let me try to get a couple of pics tonight and maybe post them tomorrow.

[Robert Sanchez]

Ok, here are the pics:

this is the patient

these are the symptoms

[David]

That engine looks brand new compared to what my engine looked like when I pulled it. I would do a compression and maybe leak down test, if they're good I wouldn't worry about it, JMHO.

[john walker's workshop]

the drip in the second pic is typically from the thrust plate. the gasket probably got damaged on assembly.

[Porsche_monkey]

Originally posted by 125shifter
That engine looks brand new compared to what my engine looked like when I pulled it. I would do a compression and maybe leak down test, if they're good I wouldn't worry about it, JMHO.

Ditto.