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Guest Message by DevFuse
 

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Valve cover gasket & plug & bolt seals sealants


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4 replies to this topic

#1 98sub2500leg

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Posted 05 June 2009 - 05:35 PM

Does anyone have a recommendation for sealants on these?

#2 johnceggleston

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Posted 05 June 2009 - 06:33 PM

Does anyone have a recommendation for sealants on these?


i didn't use any sealant on my 2.2, just new gaskets that came with my timing belt kit, on ebay.

Edited by johnceggleston, 05 June 2009 - 09:58 PM.


#3 EVOthis

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Posted 05 June 2009 - 07:02 PM

all depends which VC gaskets your talking about if its the DOHC early EJ25 I use a tab of gasket sealer on the half moons on the back of the head and where the valve cover meets the cam towers right behind the t-belt cover...besides those I personally havent ever used any sealant on any other Subaru valve cover gaskets Ive done and Ive never had a problem...

#4 davebugs

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Posted 05 June 2009 - 07:55 PM

I never add anything to them on 2.2's.

Someone eluded to where the little black pieces (IIR) on the DOHC heads that typically already have some ultra-grey (or similar) on them.

It's been a while but I don't think I did any sealant around them (but my memory isn't so good).

#5 98sub2500leg

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Posted 05 June 2009 - 11:47 PM

I never add anything to them on 2.2's.

Someone eluded to where the little black pieces (IIR) on the DOHC heads that typically already have some ultra-grey (or similar) on them.

It's been a while but I don't think I did any sealant around them (but my memory isn't so good).


Sorry I didn't re-post on this earlier. On the half moon seals I used high temp ultragrey since that is similar to what the factory used. I noticed they over globbed a lot of their RTV on during assembly and had a lot of squeeze out in both internal & external areas. I never noticed a problem as far as any broken off or stuck pieces in any oil ports. I take Dave's approach, squeeze it on & thin it by hand. After application and in areas where I still have internal access I clean up any residual squeeze out. I was hesitant to touch those 1/2 moon plugs, because the RTV seals around them still looked, but since I already bought new ones I decided to change them and glad I did. They looked sealed but pulled right out. Usually with RTV you can tell how good the seal still is when pulling off the part and what type of RTV was used. These pulled right out and I believe the RTV was delaminated after the machine shop cleaning of the heads. They never did leak.

There was more than average weeping of most seals & O rings. I decided to change all of them so far since the engine has over 100k miles on it. Most would probably consider this overkill. Still haven't touched the rear main. I am fairly confident this should make it to at least 200k miles or more, especially since the material is Viton, although it may leak after I put it back together, who knows(it's like going to Vegas). If I do decide to do it, I have it done at the dealer. they have a tool to properly remove it and reseat the new one. The tool seats it to make sure it is concentric and eccentric to surrounding surfaces.




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