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Thread: sealant on headgasket?

  1. #1

    sealant on headgasket?

    Is it good or bad to use copper spray sealant on your headgasket?
    Thanks,
    Frank

  2. #2
    turbo addict
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    Re: sealant on headgasket?

    It's not a recommended procedure from the manufacturer, but I wouldn't be surprised to hear some people say it's a great thing to make up for small variences in gasket surfaces.

  3. #3

    Re: sealant on headgasket?

    Would using it cause a problem?

  4. #4
    two point two much fun Turbo Mopar Staff Turbodave's Avatar
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    Re: sealant on headgasket?

    I've used it many times on the MP gaskets and have had no issues, I like to think it helps get a good seal and transfer heat across the gasket.
    Dave Tekampe
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  5. #5

    Re: sealant on headgasket?

    Thanks. I guess I'll use it then.

  6. #6
    turbo addict
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    Re: sealant on headgasket?

    Quote Originally Posted by Turbodave View Post
    I've used it many times on the MP gaskets and have had no issues, I like to think it helps get a good seal and transfer heat across the gasket.
    Do you run any non-coated gaskets in your cars?

  7. #7
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: sealant on headgasket?

    I run it if its an older engine but if both surfaces are fresh, then I don't bother. It won't hurt so if your a bit worried about seal, just use it.
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  8. #8
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: sealant on headgasket?

    Head Gasket in a can!


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  9. #9
    Supporting Member II Turbo Mopar Contributor
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    Re: sealant on headgasket?

    I use the Mopar gasket spray intended for thier MLS headgaskets on the headgaskets I install. I've never had one leak using that stuff.

  10. #10
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: sealant on headgasket?

    I sprayed some on two used (not for long) MP headgaskets, both held 18psi without problems. About to copper spray and reuse another one, in fact..

    Dont push the red button.You hear me?

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  11. #11
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: sealant on headgasket?

    Quote Originally Posted by 86Shelby View Post
    I use the Mopar gasket spray intended for thier MLS headgaskets on the headgaskets I install. I've never had one leak using that stuff.
    Got a part number?
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Turbo Diesel.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

    TIII adapter plates for a dizzy.Link to info.

    Log/tube headers, welding, manifolds, U name it! Link to info.

  12. #12
    Supporting Member II Turbo Mopar Contributor
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    Re: sealant on headgasket?

    Going by the description I found online this should be it. I'm not close enough to the garage to be able to double check.

    4318035AA

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  13. #13
    turbo addict
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    Re: sealant on headgasket?

    HYLOMAR! It fills all the little imperfections in the head and block. It also works great on paper gaskets because they wont stick and you can re use them
    Ian Adams

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  14. #14
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
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    Re: sealant on headgasket?

    Used copper spray on a 100k mile set of headgaskets that sat in a shed for 3 years. Got them to seal after warming up the engine (and not retorquing anything). Only problem was 1 coolant passage that leaked until it warmed up.

    Hylomar is good stuff but its very expensive. Use it for solid copper headgaskets. Thats how you get copper headgaskets to seal longterm. Copper is the only time I would use it but its probably better for doing stupid stuff like paper gaskets that have serious mileage on them. More expensive then the headgasket being replaced so it would not make sense to actually do it.

    I am going to reuse a set of paper gaskets next month, but they were new Felpro as of last year. Swapping heads between cars.
    Then the motor that had those gaskets gets a new set someday when I put it back together. I use it on new gaskets, paper and MLS. Mostly because I would rather spray then remove material from my cylinder head (weak deck). The real reason is money, the other things are justifications
    Brent
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  15. #15
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: sealant on headgasket?

    Quote Originally Posted by 86Shelby View Post
    I use the Mopar gasket spray intended for thier MLS headgaskets on the headgaskets I install. I've never had one leak using that stuff.
    Good point on using the Mopar stuff on the Mopar MLS gaskets

    As a side note, Cometics does NOT recomend spraying their MLS headgaskets with anything as they are already Viton™ coated already... I didnt ask them if they need to be sprayed if re-used tho?

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  16. #16
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
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    Re: sealant on headgasket?

    Cometics are terrible headgaskets anyways. They somehow manage to make a worse MLS then OEM MLS.
    Brent
    GREAT DEPRESSION RACING
    1992 Duster 3.0 - 11.5@125 22psi $90 Stock 3.0 Junk Motor - 516whp 519wtq 20psi 91 oct built 3.0 stock n/a computer
    Currently Megasquirt II/Extra. Stock 10:1 3.0 naturally aspirated
    1994 Spirit 3.0 - 13.85@108.8 10 psi - Daily Holset He341
    1994 Spirit 3.0 A670 - Wife's
    1981 Starlet KP61 Parts
    1983 Starlet KP61 Parked

  17. #17
    turbo addict
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    Re: sealant on headgasket?

    Installed 4 MP headgasket dry into different cars, never had a problem with leaking.

  18. #18
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: sealant on headgasket?

    Quote Originally Posted by Ondonti View Post
    Cometics are terrible headgaskets anyways. They somehow manage to make a worse MLS then OEM MLS.
    I have had great luck with them on both the 2.2L and 2.4L

    What problems have you had on yoru car with them? Why do you think they are terrible?

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  19. #19
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: sealant on headgasket?

    Quote Originally Posted by BadAssPerformance View Post
    I have had great luck with them on both the 2.2L and 2.4L

    What problems have you had on yoru car with them? Why do you think they are terrible?
    I had a used one not seal under boost, coated it too,
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Turbo Diesel.

    Aurora ignition wires for sale. Link to info

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    TIII adapter plates for a dizzy.Link to info.

    Log/tube headers, welding, manifolds, U name it! Link to info.

  20. #20
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: sealant on headgasket?

    All bets are off on any "used" gasket

    But now I'm curious, did you coat it between the layers?

    JT
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    JOIN SDAC and your local Chapter TODAY! - SUPPORT the CLUB that supports YOUR HOBBY!
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