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Thread: V8 exhaust manifold

  1. #1
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    Jun 2018
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    Melbourne
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    527

    V8 exhaust manifold

    Hey all,
    Ive been trying to fix a loose manifold gasket, on the downpipe section not on the engine. One of the nuts is shagged and its just not coming off and the stud has started to turn. I've been trying with vice grips but it's just not happening. I was thinking it's gonna be a pain to fix in the car so I'm gonna try and pull the whole lot at once. And while I'm at change all the exhaust gaskets.
    My main concern is getting it all out at once, the engine mounts look like their in the way and the track rod looks like it's gonna have to removed.
    Is it doable or do I have to separate the exhaust from the exhaust manifold?
    Cheers Jim

  2. #2
    DAMINK Guest
    A saying i often think of in these situations mate.
    The long way will end up being the short way.
    Take them off from the heads and your job is easy. Gives you room to move and install is much easier.
    pull out the stud and replace it and a new nut.
    Speak to Mario for some gaskets and what not and your done.
    I JUST THREW OUT SOME MANIFOLDS DAMN IT!!
    Like a week ago to the damn tip as they were taking up too much room.

  3. #3
    Join Date
    Jun 2018
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    Yes so far it's been verryyy long, I've spent about 3 hours with the vise grips turning it a lil at a time. But the nuts completely round now, I could barely get a grip with a socket to start with. Original plan was to replace the nut and tighten up the join but nah.
    So you reckon try and separate them in the engine bay still? I was gonna try and pull it all apart on the bench and put it back together in place
    Cheers

  4. #4
    DAMINK Guest
    If it was me i would separate and get it onto the bench.
    If that means cutting off a stud then i would with an angle grinder of dremmel or whatever. Easy out or whatever method suits you to get that stud out afterwards.
    Heat the crap out of it and remove the stud and nut together. Even if you have to weld a rod to the stud to use that to get it out.
    Then a new stud and badda bing badda boom.
    Last edited by DAMINK; 11th October 2018 at 07:05 PM. Reason: needed more info.

  5. #5
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    Quote Originally Posted by DAMINK View Post
    If it was me i would separate and get it onto the bench.
    If that means cutting off a stud then i would with an angle grinder of dremmel or whatever. Easy out or whatever method suits you to get that stud out afterwards.
    Heat the crap out of it and remove the stud and nut together. Even if you have to weld a rod to the stud to use that to get it out.
    Then a new stud and badda bing badda boom.
    I was thinking of cutting it, I can get to it with a dremel. As long as the nut closer to the engine dosnt do the same. Might try and clean the thread a bit better on it. Once the manifolds on the bench no worries, I can drill the stud out if I have to then. Sound like a Saturday when I don't have to to work the next day, just in case.
    Cheers Jim

  6. #6
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
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    11,344
    If the stud is turning it should screw out with the nut attached. I usually soak difficult looking exhaust nuts a few times over 1-2 days with CRC or similar, then get the tightest fitting socket on it.

  7. #7
    Join Date
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    Kilmore, VIC
    Posts
    468
    I've got one here where the stud just spins... Can happen.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 32" KL71s, 3deg front arms, D2 front shaft, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Watch this space...

  8. #8
    Join Date
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    Location
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    Well I guess it's good sign it turns so it won't be too hard to remove once the manifolds out of the engine bay. Is it worth cleaning up the inside with a die grinder while it's Out?
    And if the other bolts on the flange have the same fate is it possible to maneuver the whole exhaust out then I can remove them on the bench?

  9. #9
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    Apr 2009
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    Crafers West South Australia
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    Quote Originally Posted by LRJim View Post
    Well I guess it's good sign it turns so it won't be too hard to remove once the manifolds out of the engine bay. Is it worth cleaning up the inside with a die grinder while it's Out?
    And if the other bolts on the flange have the same fate is it possible to maneuver the whole exhaust out then I can remove them on the bench?
    You would have to cut the pipe underneath as it's a Y piece that goes up both sides. Nothing a bit of pipe sleeve and a mig welder can't fix. Only bother with die grinding if you find any obvious lumps, these manifolds are otherwise fine for their intended purpose.

  10. #10
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    Quote Originally Posted by bee utey View Post
    You would have to cut the pipe underneath as it's a Y piece that goes up both sides. Nothing a bit of pipe sleeve and a mig welder can't fix. Only bother with die grinding if you find any obvious lumps, these manifolds are otherwise fine for their intended purpose.
    Thanks for that, I didn't think I'd be able to maneuver both manifolds out and the Y pipe together. To much in the road, I'll see how I go hopfully there is some meat on the other nuts. I'll have a look in the pipe for lumps but otherwise I won't touch it.
    Cheers Jim

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