To use head gasket sealant or not
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  1. #1
    PWCToday Guru
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    To use head gasket sealant or not

    I have a few different opinions from different shop manuals. I will be using a fibre gasket and not a copper gasket. One manual says to use a high temperature silicone sealant and the other says to put it on dry. Is there any reason not to use a thin film of sealant on both sides of the gasket for added security?

    It's a js550 if that makes any difference with stock compression.

  2. #2
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    Silicone will seal water, but it will not seal gasoline. I use clear silicone on the waterjacket area only.
    Kat

  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    you do not need any gasket sealer. put it on dry. zig
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  4. #4
    PWCToday.com Is My Home Away From Home the WaTeRhAwK's Avatar
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    Usually on fiber gaskets the oil and gasoline mixture will kindof make a gummy substrate that will soak into the fiber gasket and make it seal off completely, same thing on intake manis, but on cylinder base gaskets and exhaust manis I always smear a film of threebond 1211 on both sides for an added seal for the break in procedure. you may want to use a feeler guage and check the tolerances of the head surfaces and the cylinder surfaces just make sure you're getting a clean mating between the two though. if you put in on a perfectly flat surface and it rocks back and forth you wil need to plane it flat doing the figure 8 motion on some 220 sand paper taped flat to a sheet of 1/4 inch glass.

    CCC


  5. #5
    PWCToday.com Is My Home Away From Home jpilot98's Avatar
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    i go with zig... ive never used a sealant and have never had problems.. i wouldnt use it... put it on dry
    93 550sx, 93 750sx, 07 zzr 600, 2 kids, 1 job, and one pi$$ed off wife... life is grand... im ready for some beers

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  6. #6
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    I will probably use no sealant for this rebuild based on the majority of comments. I didn't use it last time I rebuilt it. I noticed a little bit of seapage from the water jackets, but nothing that ever caused any problems. I just thought if I put some high temp. gasoline resistant sealant on there it might help out against it possibly happening again.

    I guess I'll just put it on dry like last time. Thanks for all the advice 8)

  7. #7
    The Shredder
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    Re: To use head gasket sealant or not

    What if you use gasket material and make your own gaskets . Sealant or no sealeant?

  8. #8

    Re: To use head gasket sealant or not

    Another vote for dry!

  9. #9
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    Re: To use head gasket sealant or not

    Mark another one for dry! But read this too.... After a few years racing and a few blown head gaskets on a 440 superstock that was bored to max, 1.50 over I switched to copper head gaskets with a carefully apllied thin film of copper sealant and I never had blown head gasket prob's again so Now I never use oem gaskets on the head any more. Keep in mind what gasket you need also, thickness .40 or .20, various reasons for thicknessof the gaskets depending on how much clearance from head milling or block milling and or compression you want plus more..... Try a copper head gasket and see!
    Last edited by Railin Rob; 08-04-2007 at 12:49 PM.

  10. #10
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    Re: To use head gasket sealant or not

    Hi guyz, im new here. Is there a special way 4 putting on a copper gasket? Coz i read sumwer u supposed to heat it at a certain temp, cant rememba wer thou. And wat bout expanding wen hot wont tht affect the pistons?

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