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Guest Message by DevFuse
 

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redoing half moons on DOHC EJ25 head


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6 replies to this topic

#1 bearbalu

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Posted 18 December 2004 - 02:25 PM

I am doing head gasket.

Does anyone know if I should redo the half moons that are on the back side (towards flywheel) of the head. If so what sealant should I use? Permatex Ultra grey okay. Subaru Service Manual doesn't mention it all all in Cyclinder Head service procedure.

#2 richierich

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Posted 18 December 2004 - 06:09 PM

yes, you should but you should put in new half moons, rather than trying to reseal those in. If you can't get them or don't want to do it, it is better to leave them alone, than take them out and reseal the oil ones. Grey High Temp Permatex will work.

Also put a dab of it where the camshaft seal housing and the valve cover gasket touch. (There should be little bit of it dried up there, so clean that off and then add somemore.

#3 99obw

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Posted 19 December 2004 - 07:55 AM

IIRC mine were in so tight that I couldn't easily get them out, so I left them alone. The sealant used at the factory seems really good. No leaks so far.

#4 bearbalu

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Posted 19 December 2004 - 01:52 PM

I do have new half moons...I will see if I can pull them out...if not I will leave them alone...

thanks

#5 richierich

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Posted 19 December 2004 - 09:43 PM

If they don't come out, put a little silicon over them before putting the valve cover back on.

#6 bearbalu

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Posted 02 January 2005 - 03:04 AM

I sprayed some permatex gasket remover and they pulled off real easy. Put in the new ones.

Does anyone know what function the half-moons serve? Why not just have metal there instead?

#7 99obw

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Posted 02 January 2005 - 08:19 AM

I think those are the result of line boring the heads for the cam journals.




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