HT4100 Exhaust Manifold Gaskets
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HT4100 4.1, 4.5, 4.9 Discussion, HT4100 Exhaust Manifold Gaskets in Cadillac Engine Technical Discussion; Can anyone advise me about exhaust manifold gaskets on the HT4100 engine. We are changing the head gasket on an ...
  1. #1
    bentleyboy is offline Cadillac Owners Member
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    Question HT4100 Exhaust Manifold Gaskets

    Can anyone advise me about exhaust manifold gaskets on the HT4100 engine.
    We are changing the head gasket on an 85 Seville, the exhaust manifolds are fitted as standard according to the workshop manual without gaskets but the gasket set includes them. Should we use them or not, any other tips and advice on this issue would be much appreciated as I am in the UK so can't ask my local garage!
    Regards,
    Geoff.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: HT4100 Exhaust Manifold Gaskets

    It has been decades since I've replaced the head gaskets on my '85 Eldo and can't remember, bit if there is gaskets on it when you remove the manifold, replace them. If there isn't, don't.

  4. #3
    drewsdeville is offline Cadillac Owners Master
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    Re: HT4100 Exhaust Manifold Gaskets

    Yes, like Ranger said, if there were none, DO NOT use them.

    I made this mistake on my first 4.X head gasket job. I used the gaskets and after some time, the gasket surfaces on the heads and manifolds pitted/corroded.

    THe head and manifold surfaces are machined very flat and are made to be used without gaskets. As long as the mating surfaces are in good shape, just bolt them on.

  5. #4
    steelybill is offline Cadillac Owners Enthusiast
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    Re: HT4100 Exhaust Manifold Gaskets

    It's typical for gasket sets to include exhaust gaskets, which most people don't use. And the pitting of the parting surfaces is a good reason not to.

  6. #5
    carnut is offline Cadillac Owners Master
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    Re: HT4100 Exhaust Manifold Gaskets

    Simply lay a straight edge on the manifold surface. Can you slip a .005 inch feeler gauge between the straight edge and the manifold. If you can, use the gaskets. If not, dont. They are in the sets because 25% of the time exhause manifolds warp once removed.

  7. #6
    bentleyboy is offline Cadillac Owners Member
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    Re: HT4100 Exhaust Manifold Gaskets

    Thank you all for your advice, the heads are fine so we will check the manifolds
    as suggested and hopefully we wont need to use them.

  8. #7
    83CADMAN's Avatar
    83CADMAN is offline Cadillac Owners Fanatic
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    Re: HT4100 Exhaust Manifold Gaskets

    I had to replace a cracked exhaust manifold on my 90 Seville 4.5. I located a replacement at my local u-pull yard and found no gasket upon removal of the donor manifold. My books are ambilivant concerning gasket or no gasket, refering to using a paste, but when I removed the one from my car I found a gasket. So I bought a new gasket and installed it.

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