Head Gasket replacement

Despite what Cometic's Aust supplier told Pedro, I'm still not sure about putting Hylomar or anything else on the Cometic gaskets especially as Cometic's website warns against it.

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Why does Cometic recommend MLS gaskets to be installed dry?
Cometic Multi-Layer Steel (MLS) head gaskets go on dry because they are coated with a sealant. Each MLS head gasket is coated with a .001" thick Viton rubber that is bonded to the outer stainless steel layers. Adding an additional sealer can hinder the performance of an MLS head gasket.

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Originally Posted by p38arover

Despite what Cometic's Aust supplier told Pedro, I'm still not sure about putting Hylomar or anything else on the Cometic gaskets especially as Cometic's website warns against it.

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Ron

Sounds like it may be best to follow the manufacturers in instructions

Did you buy the rest of the bits like o-rings etc separately ?

I won't need injector seals since I put those GenIII injectors in recently, but I think stuff like valve stem seals will be required.

Steve

Steve, did you post up any tech info on the GenIII injector swap?:angel:

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Originally Posted by Pedro_The_Swift

Steve, did you post up any tech info on the GenIII injector swap?:angel:

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I did mate :cool:

http://www.aulro.com/afvb/p38a-range...-trumpets.html

Steve

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Originally Posted by TheTree

Ron
Did you buy the rest of the bits like o-rings etc separately ?

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I only bought studs, valley end seals, valley gasket, head gaskets, and exhaust gaskets. We fitted new coolant hoses in the difficult to access spots.

I didn't pull the injectors so I didn't need seals. I didn't touch heads apart from a skim, they'd been rebuilt with new guides, etc., when the engine was built 40,000km earlier.

I just spoke to Rupert Prior and he seems to think it is more likely to be a manifold gasket leak, so I am going to get the borescope camera out and have a good look around.

It may be less work than I thought, fingers crossed!

Steve

From what we could see today it looks more like it's the head gasket rather than the manifold gasket :(

Will look more closely next time we have it on the hoist

Steve

Steve,, for a MLS gasket to work,,

and you DO want it to work,,
The heads and block must be a mirror finish,, or around 50 Ra.

which is why I used Hylomar,,

I'm sure the Cometic website assumes all builds will be using NEW components.

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Originally Posted by Pedro_The_Swift

I used 40thou. wish I'd used 20 now,,

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You can use the 20s next month.

Yesterday I asked Bruce Davis if they used anything on Cometic gaskets. He said they didn't.