Aluminum Heads leaking - Team Camaro Tech
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post #1 of 5 (permalink) Old Aug 5th, 02, 12:56 PM Thread Starter
 
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Location: Daly City, Ca.
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I have AFR Aluminum Heads on a 68 small block stroked engine built by a professional engine shop. The engine only has 3000 miles on it and suddenly it seems that it is leaking a little oil and coolant over the number 7 cylinder. I took off the valve cover and did not see and coolant in there. As far as I can tell it is coming from the gasket right over the plug.
I was told that I would never have to re-torque the heads. Is this true? Should I torque them now to try to stop this?
What should I do differently for aluminum? Would a compression check tell me if the gasket has failed?

James K.
383 small block with AFR alum heads
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post #2 of 5 (permalink) Old Aug 5th, 02, 01:57 PM
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If you are sure that it's coming from within, and not blowing back from the dipstick or dripping down from the valve cover, and especially check the oil galley plug that is on that side of the block usually half blocked by the head, you can try to retorque.

But, I have seen this before and since there is not oil pressure per se in the heads, the oil is working its way down from the drain when it passes over the head/block junction at the rear of the head. Sometimes retorquing will suffice to remedy, however, if you jerk the intake, clean the exit with brake cleaner really good so that high temperature silcone will stick, then that's the remedy.

Of course you could pull the head and replace the gasket. I have only seen this problem with the special print-o-seals from Felpro. Is this what you have?

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STEVE JACK
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post #3 of 5 (permalink) Old Aug 6th, 02, 11:36 AM Thread Starter
 
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It has been awhile so I don't remember the type of gaskets we used. But it is not all oil leaking. I am seeing definite coolant as it gather around the last lower bolt on the heads. The oil just seems to be seeping from somewhere close by. I will retorque to spec and if that doesn't work try the manifold gasket. However, I know coolant would but would oil leak if the manifold gasket was failing? Thanks James

<BLOCKQUOTE>quote:</font><HR>Originally posted by HOTRODSRJ:
If you are sure that it's coming from within, and not blowing back from the dipstick or dripping down from the valve cover, and especially check the oil galley plug that is on that side of the block usually half blocked by the head, you can try to retorque.

But, I have seen this before and since there is not oil pressure per se in the heads, the oil is working its way down from the drain when it passes over the head/block junction at the rear of the head. Sometimes retorquing will suffice to remedy, however, if you jerk the intake, clean the exit with brake cleaner really good so that high temperature silcone will stick, then that's the remedy.

Of course you could pull the head and replace the gasket. I have only seen this problem with the special print-o-seals from Felpro. Is this what you have?

<HR></BLOCKQUOTE>

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post #4 of 5 (permalink) Old Aug 6th, 02, 01:01 PM
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Before you can fix it, first you need to find out where the fluid is coming from. Clean the area well with a rag, then sprinkle some talc or baby powder around the leak area; it will become obvious in short order exactly where it's coming from, then you'll know what you're dealing with.

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post #5 of 5 (permalink) Old Aug 6th, 02, 03:31 PM
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John Z....what a brilliant idea with the powder! I will use it.

The manifold gasket will leak both at the very rear, but not over the number 7 cylinder unless it's coming down the back of the head near the firewall and sneaking around the corner. John's suggestion is paramount in determining where the leak is coming from.

My bet is that the head gasket is in need of retorqing. It may work, then again may not. These things are fluky about these things and if it's caused by a surface imperfection you may have to pull the engine depending on what the imperfection it. Hopefully it's only a loosy goosy gasket.

------------------
STEVE JACK
ConceptOne Pulleys and Brackets
Northern/Southern Rodder Magazine's "Jack'Stands" author and creator
Techical forum/links at www.inccn.net/techforum.htm
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