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1G Oil pan rail thread repair

Posted by SasaniFab, Jul 15, 2020

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  1. SasaniFab

    SasaniFab Freelancer

    2,384
    689
    Joined Dec 1, 2013
    danbury, Connecticut
    Hello boys , my buddy’s car came back for some work and I had the pleasure of repairing some striped threads on the timing cover rail and block. This is what I use to repair threads on anything I’m fixing.... In this case 6x1.0mm time sert kit , 5mm depth inserts and some lock tight , it’s really tight on the car so I used a tap wrench adaptor for a socket drive and used my Milwaukee ratchet. You could probably get away with using longer time serts in certain areas but the timing cover side under the belt is extremely shallow. 5mm is your best bet imo
     

    Attached Files:

    Street Build 4K  20

    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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    steve likes this.
  2. motomattx

    motomattx Proven Member

    2,950
    1,013
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Yup, that's the proper way.other than welding them shut and re-drilling and tapping them or replacement of the part, Helicoils are only for superficial parts that are not under any stress.
     

    Drag Race Build 4K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. Mello

    Mello Proven Member

    1,141
    325
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Good to know. At work we always are required to use helicoils with aluminum or high vibration in critical assemblies with our aerospace & flight vehicles jobs.
     
    ErikTande likes this.
  4. SasaniFab

    SasaniFab Freelancer

    2,384
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    Joined Dec 1, 2013
    danbury, Connecticut
    This argument has been going on for a long time , I’ve done quite a bit of research on the matter. With a helicoil The big advantage over a solid insert is the inherent flexibility of the insert provides a more balanced distribution of dynamic and static loads throughout the length of the thread engagement. They are also cheaper . Engineering decisions aren’t made on strength alone. I’d also imagine the helicoil kits most guys get at the parts store are not the same as the kits used At Boeing. For our application it’s really like comparing an apple to an apple. I own every metric kit available for time sert including Bigserts. I love them , I repaired spark plug holes, transmissions .... you name it. If you work on old cars , these are necessary
     

    Street Build 4K  20

    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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    1990TSIAWDTALON likes this.
  5. Buddy2

    Buddy2 Proven Member

    104
    24
    Joined Oct 7, 2013
    Helsinki, Europe
    Helicoils been working great on repairing fp turbo to manifold threads. No more thread pulling what so ever anymore. Also love them when working with aluminium threads that has failed from overtorquing
     

    348  9

    1992 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    153  0

    1992 Mitsubishi Eclipse GSX
    manual · 1G DSM

    633  8

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  6. motomattx

    motomattx Proven Member

    2,950
    1,013
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Good to know, however if this is some feeble attempt to discredit my knowledge your out of your league. Not only do I get to do some flying of aircraft, I also get to do some work on them, big fan actually some would tell you. So lets qualify your statement here, maybe you dont know why inserts are used in the Aerospace industry??? let me give some insight for those still tuning in: inserts are used in the Aerospace and aircraft industry to avoid galvanic corrosion, since airplanes are made to be maintained at a much higher rate than we would for on the ground vehicles for hopefully obvious reasons, we cant allow the fasteners to rust/corrode and do damage or break upon disassembly since they might be removed hundreds or thousands of times in their lives, we use inserts made of NOBLE metals to avoid that, now these are not like the junk aluminum springs that you purchase for $10 at your favorite parts stores that are made to hold non life threatening parts to your car such as a stripped oil drain plug, these are made of aerospace grade materials that are installed to stop corrosion, not to repair a damaged oblong set of threads in something (not that there aren't idiots out there that might use it for that on an airplane).

    This is a comparison of apples to oranges, this here is an automotive thread where the guests are using automotive grade parts to fix automobiles, we aren't using airplane parts on our cars and we aren't using airplane quality noble metal parts for corrosion resistance on our 4g63's here, to keep this in perspective we are using inserts to repair damaged holes that are no longer round or straight in most cases, and in these cases the Helicoil brand doesn't do the permanent job that a timesert does, I cant think of a single machine shop that has Helicoils on the property even, the large percentage will either weld the hole shut and retap it or tap it to an oversize thread or install a Timesert or Bigsert.

    I am currently working on a 4b11 for a few buddies, the engine came from a owner that installed Helicoils (unknown at the time of purchase) on the main studs, I went over with my measuring tools to take measurements and to show the guys the proper way to build/check an engine over to see what machining was needed...I got as far as trying to torque down the main caps so that I could take measurements with a bore gauge, I got as far as 20 ft lb when three of them would no longer get any tighter, guess what the issue was? Helicoils in three of the holes that pulled out of the block as I tried to tighten them, again: I couldn't even get 20 ft lbs out of them! these were even installed with locktight and still not even close, of course this guy was very happy to find out that he paid $3000 for this pile of junk that will now need Bigserts installed to repair it properly, as I said before save the Helicoils for home repairs, not something that needs to actually perform in a critical function.
     

    Drag Race Build 4K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  7. motomattx

    motomattx Proven Member

    2,950
    1,013
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Correct, but people cant be a man these days and be wrong, we have to justify why what we used is the goat! instead, we will argue everything, wrong or not we will find ways to prove that we only make the best decisions even when buying and using inferior junk.
     

    Drag Race Build 4K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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