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Cadillac Seville / Cadillac Eldorado Forum Discussion, Head gasket question in Past Cadillac Vehicle Discussion; Originally Posted by JimD More to the point, it is the threaded bolt holes in the block that require attention. ...
  1. #16
    geegeeburr is offline Cadillac Owners Member
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    Re: Head gasket question

    Quote Originally Posted by JimD View Post
    More to the point, it is the threaded bolt holes in the block that require attention. GM/Cadillac (Northstar) Service Manuals recommend the head bolts NOT be reused AND the block threads be "refreshed" (my terminology) with TimeSerts: No matter why the head bolts are removed!

    O. M. G.
    Not sure why, but because of the way you said this, I just suddenly got the whole, clear, picture. I was thinking of the head gaskets and the bolts as two totally separate entities, not fully appreciating that in order to change the head gaskets, you would have to take out the bolts! And then Ranger's comment about not wanting to do this job twice made sense, because of course you would go ahead and fix a known defect with the bolts while you were already right there. Gah! The light bulb goes on.

  2. #17
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The bolts aren't the problem, it's the threads in the head bolt HOLES on the block.

  3. #18
    geegeeburr is offline Cadillac Owners Member
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    Re: Head gasket question

    Sorry, yes, you guys have said that. I'm using "bolts" interchangeably, and inaccurately, with "bolt holes." Still, like Jim said, once the bolts are removed, of course you're going to fix the holes, because you're already there, and there would be no sense in not fixing them if they're just going to fail down the road. It was just the realization of why one would automatically do the bolt holes if already doing the gaskets.

    For that matter, I don't know for a fact that the engine has never been timeserted/normserted/fixed in some way. There were well over 150K miles on it by the time my pop picked up the car. Even if the bolt hole issue was fixed, you could still blow a gasket from bad overheating, couldn't you? Like if you had a cracked radiator? Or is that where the "camel" function comes into play, and keeps you from blowing the gasket?

    Wow, if you are in MA, you must really be a night owl, MC.

    ETA: Just to make sure, you DO have to take out the bolts in order to change the head gasket, right?

  4. #19
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's pretty unlikely that an overheat will damage the gaskets. Camel mode protects a number if parts from heat damage.

    The bolts in question hold the heads to the block, and the gaskets are in between (and the bolts pass through the gaskets as well), so yes, all of the bolts have to be removed to replace the gaskets.

    Yes I'm in MA., and yes I'm a night owl most of the time. Insomnia will do that . Been up since ~9:00 yesterday morning, trying to "get tired" now. More Australian members have to join so I have something to keep me busy, lol.

  5. #20
    stoveguyy is offline Cadillac Owners Connoisseur
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    Geegee, describe your work setup? Do you have a garage? Live in an apartment? Where do u park? On the street? Do you have a GOOD tool set? Floor jack, jack stands, engine hoist, power tools, torque wrench, and tons of patience?

  6. #21
    Ranger's Avatar
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    Re: Head gasket question

    Geegee, maybe this will help. There are 10 head bolts (not shown) on each side holding the heads (#224 & #248) to the block (#101). As mentioned, the HG's (#233 & #235) are sandwiched and clamped between the two.


  7. #22
    Submariner409's Avatar
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    Re: Head gasket question

    .......... and the complete repair from start to finish, is intense, dedicated work - not for the faint of heart.

  8. #23
    geegeeburr is offline Cadillac Owners Member
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    Re: Head gasket question

    Morning guys.

    TY for the answers. Stoveguyy, We have a tiny garage, which is used as a small woodworking shop, basically. Can't park in there. Live in a house, park on the street or driveway, which is where we would do the work if we were foolish enough to try. Have a pretty good amount of tools- several ratchet sets, small compressor, hand tools, most power tools known to man. Do have a torque wrench, but unfortunately don't have an angle drill. Jacks and hoists- no. We only have a big jack that came with an old Dodge van we used to drive, and our neighbor has ramps we can borrow. A building contractor, a plumber, and an electrical engineer are neighbors, so sometimes if I don't have a tool, I can borrow from them.

    Ranger, thanks for the picture. You don't have to take each and every one of those parts apart, do you? And what is #201 called, please. I have been looking at pictures on the internet, and can figure out a lot of things from the pix, like for example, what the coils are, and what must be the cam shaft and such. But then there are others I can't figure out, like what the heck is a manifold.

    Truthfully, I'm about 90% sure that tackling this job would be insane. But since the next option after this really is miracle in a bottle (already purchased) it's nice to be sure we're not totally ruining something that we maybe could fix.

  9. #24
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    Re: Head gasket question

    Quote Originally Posted by geegeeburr View Post
    Truthfully, I'm about 90% sure that tackling this job would be insane.

    But since the next option after this really is miracle in a bottle (already purchased) it's nice to be sure we're not totally ruining something that we maybe could fix.
    DO NOT USE THAT STUFF
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  10. #25
    N*Caddy's Avatar
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    Re: Head gasket question

    That diagram is for a '94 and older engine. 201 is a plastic cover that goes over the spark plug wires. You don't have that in your car, the sparkplug wires are routed now on top of the intake manifold underneath the engine cover.
    Do not use the bottle thing!

  11. #26
    Ranger's Avatar
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    Re: Head gasket question

    Quote Originally Posted by geegeeburr View Post
    But then there are others I can't figure out, like what the heck is a manifold.
    Noun:
    A pipe or chamber branching into several openings.


    There are 2 manifolds, well actually 3. An intake manifold and 2 exhaust manifolds.



    The intake manifold is #546. Intake air is drawn in and fed to all 8 cylinders.

    The two exhaust manifolds (#517 & #532) bolt to each head and route the burnt exhaust gases from each of the 8 cylinders to the exhaust pipes.



    P.S.
    There will be a quiz later.

  12. #27
    98cadillac is offline Cadillac Owners Fanatic
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    Re: Head gasket question

    If I had another car, I would take my time and do the head/gasket bolt job on mine over a period of several weeks.

  13. #28
    geegeeburr is offline Cadillac Owners Member
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    Re: Head gasket question

    Quote Originally Posted by Ranger View Post

    P.S.
    There will be a quiz later.
    Haha, thanks, and I already studied for it earlier this afternoon. Found someone who drew an analogy between manifolds and lungs, saying that the intake manifold directs the air to the combustion chambers (inhale) and the exhaust manifolds function as the exhale. That description, I get. Then I found out the manifold cover is what I thought were the coils, and the coils don't look like coils at all, but more like squares. Sigh.

  14. #29
    Ranger's Avatar
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    Re: Head gasket question

    Yeah the coils on your car are not the old coils of yesteryear, but if you really want to get confused you should see the 2000+ engines with COP (Coil on plug) ignition. No visible coils or wires. Just an ignition "cassette" inset into each cam cover.

  15. #30
    geegeeburr is offline Cadillac Owners Member
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    Re: Head gasket question

    Quote Originally Posted by Ranger View Post
    if you really want to get confused you should see the 2000+ engines with COP (Coil on plug) ignition. No visible coils or wires. Just an ignition "cassette" inset into each cam cover.
    .....because I'm currently not confused enough....

    ----------

    Quote Originally Posted by 98cadillac View Post
    If I had another car, I would take my time and do the head/gasket bolt job on mine over a period of several weeks.
    I'd be tempted to at least try that, too.

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