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Thread: sealant on headgasket?

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  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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    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?

  6. #6

    Re: sealant on headgasket?

    Thanks. I guess I'll use it then.

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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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    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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    Supporting Member II Turbo Mopar Contributor Shadow's Avatar
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    Re: sealant on headgasket?

    Quote Originally Posted by BadAssPerformance View Post
    Head Gasket in a can!

    FTW! First year I had the Charger out with the 57 trim I blew the HG @ just over 25psi boost (never had a problem with the MP HG's up until then.)

    Now, granted, the deck was original and pretty rough looking to boot, which is what brought me to use the copper spray. The rest is history, in over 5 years I've only changed the HG once from a 40+PSI boost spike 3 years ago. I will never Not use it again!

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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.

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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?
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  12. #12
    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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  13. #13
    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?

  14. #14
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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.

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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 Function>Form 1990 shadow scrapped, too rusty:( 1991 Spirit R/T Scrapped, parts sold:( 1989 Turbo Caravan Daily beater with built-[I]ish [/I]​engine slowly evolving into weekend turbo beater.

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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 GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  17. #17
    turbo addict Turbo Mopar Contributor
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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 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  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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    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,
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  20. #20
    turbo addict Turbo Mopar Contributor
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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 used one the whole time I ran my built motor, and then ended up melting in on the dyno later on when I used it "for fun" on a test of using copper wire on an MLS gasket to make it work better. It did fail to seal which is why I took my built motor out and put a stock junkyard motor in to run 11's.

    But as far as good MLS gaskets go, Cometic does not have a good fire ring around the cylinder compared to many OEM mls gaskets. Been shown that the mitsubishi OEM MLS clamps much harder then the Cometic when doing pressure film testing. The Cometic just has an embossed ring around the cylinder which is a complete joke. It adds no actual thickness to the gasket there.

    Now, if you are looking for a fuze to make up for a bad tune, then sure, use a Cometic. If someone wants a fuse, use a crappy gasket IMO. I am now using Felpro composite gaskets because the 3.0 redesign gasket they did has a copper wire in the fire ring which clamps down and helps seal up when the deck tries to flex. It also puts up with changes a bit better.

    Want to see a good headgasket, see what cosworth makes.

    ---------- Post added at 07:41 AM ---------- Previous post was at 07:38 AM ----------

    At least this time I found what I was talking about.
    This link is just a repost of the original information.
    http://www.sfldrifters.com/forums/sh...ad.php?t=23323

    Just because you guys are cursed with poor headgasket offerings doesn't make the Cometic good. You pay too much for what you get.
    I would rather run a felpro on a 2.2 and learn to not detonate. People having so many headgasket issues turn into guys with engine problems when they seal things up.
    I know the only reason the stock motor broke a ringland 2 summers ago was because I put steel rings in the composite headgasket when the headgaskets couldn't hold all that awesome detonation (20+ pounds of boost on n/a timine, 8.9:1, and running out of fuel). Oh yeah, those things sealed up. Oh no!

    Look at the crap design of the cometic. It doesnt even seal at the edge of the bore so its promoting something to leak past eventually. Its like an O ring setup without the O ring.
    I am not really sure which motor this is from. Might be Evo 4g63. DSM guys are often running composite OEM headgaskets instead of MLS
    Last edited by Ondonti; 02-14-2011 at 10:01 AM.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

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