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Is my engine toast?

Posted by Ces4rDSM, Jul 1, 2019

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  1. Ces4rDSM

    Ces4rDSM Proven Member

    102
    5
    Joined Feb 2, 2019
    watsonville, California
    The stud from my exhaust manifold to head got looser and looser as i tightened the nut to bolt on my exhaust manifold to head. It soon came off with aluminum in between the threads ? I can still insert stud to a certian point but it feels if i tighten again the same problem will occur or worse. Is my engine toast ? I put a lot of time and money into getting my only car back running.
     

    Street Build 121  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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  2. pat white

    pat white Proven Member

    76
    28
    Joined Jun 10, 2017
    West Bay, NL, Canada
    the head can be repaired with a helicoil ..it involves drilling out the hole ...rethreading with the tap from the helical kit and screwing in the helicoil to complete the repair ...you may have to take the manifold off...to answer ur question the engine is still good !!
     

    Street Build 201  1

    1991 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  3. Ces4rDSM

    Ces4rDSM Proven Member

    102
    5
    Joined Feb 2, 2019
    watsonville, California
    Ohh ok, is it a rigorous job to complete?
     

    Street Build 121  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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  4. dustyboner

    dustyboner DSM Wiseman

    952
    381
    Joined Mar 13, 2016
    abq, New Mexico
    you can fix it a bunch of different ways.
    you could
    -- helicoil it
    -- retap it for a larger bolt
    -- loctite thread repair epoxy

    i have even filled the stripped hole with jb weld and sprayed the bolt with this sh** and once it sets up its solid and can be unbolted easily
    upload_2019-7-1_13-0-45.jpeg
     
  5. steve

    steve DSM Wiseman

    12,719
    501
    Joined Feb 3, 2002
    St. Charles, Illinois

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  6. Boomdeeze

    Boomdeeze Proven Member

    1,619
    254
    Joined Jul 5, 2009
    Independence, Minnesota
    I've use the heli-coils in the head on several different applications and haven't had any issues. Those inserts look awesome though, I may have to try those next time.
     

    Street Build 3K  1

    1997 Mitsubishi Eclipse GSX
    10.793 @ 128.98 · 2G DSM
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  7. SasaniFab

    SasaniFab Freelancer

    2,095
    564
    Joined Dec 1, 2013
    danbury, Connecticut
    Buy a Time Sert kit on amazon , they are about 100 bucks. You can also get a Big Sert kit if you fail at the Time Sert. I suggest you also get a drill and tap guide to make sure your going in straight. They are very cheap and fool proof. A little quick tip, when your drilling the head measure the amount of aluminum you plan to drill into and wrap some tape around the drill bit so you know when you need to stop. I can’t count how many I’ve repaired and they are all still in working order .
     

    Street Build 3K  20

    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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  8. curt-s

    curt-s Proven Member

    711
    186
    Joined Dec 21, 2008
    Winterville, MB, Canada
    Definitely second the tape for depth indicator.
    I have always used helicoils, even have one of the stud holes repaired with one myself many years ago and is still as strong today as it was then. Did it freehand, just have to be careful the hole you drill is as straight as you can possibly make it. Try to use a lightweight drill so it doesnt sag but when you start chomping aluminum it will kick. Maybe do a test run on something else first to get a feel for it?
     

    2K  1

    1991 Eagle Talon TSi
    fwd · manual · 1G DSM
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  9. AllanL

    AllanL Proven Member

    267
    21
    Joined Apr 24, 2008
    LV, Nevada
    +1 on the test run...
     
  10. Ces4rDSM

    Ces4rDSM Proven Member

    102
    5
    Joined Feb 2, 2019
    watsonville, California
    Thank you all very much yall are awesome. I decided to go heli coil, if It is super temporary with heli coils I will go with another option. O boy ive been trying to get this dsm running but just problems after problems after I decided to do the hg replacement myself.
     

    Street Build 121  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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  11. pauleyman

    pauleyman DSM Wiseman

    5,085
    961
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    I've done a bunch of these with heli coil. In my opinion a heli coil is not a temporary solution
     

    Street Build 2K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  12. curt-s

    curt-s Proven Member

    711
    186
    Joined Dec 21, 2008
    Winterville, MB, Canada
    Agreed, I've had a helicoil stud in for 6 years or so and has been through a couple manifold removals. I just recently pulled the stud out to check the threads and condition, and it looks just as though I had just installed it. I did use the opportunity to remove some of the old shavings from the tap.. oops

    Don't get me wrong, I pucker a little every time I tighten that one, but it always comes back asking for more torque. I just don't give it any more than it needs.
     

    2K  1

    1991 Eagle Talon TSi
    fwd · manual · 1G DSM
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