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redoing half moons on DOHC EJ25 head


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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.

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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.

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