Results 1 to 8 of 8

Thread: Stripped Engine Case Hole

  1. #1
    Member
    Join Date
    Jun 2015
    Location
    Connecticut
    Posts
    51

    Stripped Engine Case Hole

    Hi Folks,

    I am in a bit of a pickle. I have stripped an M10 engine case hole, one of the four that attach the transmission to the engine. I ordered a Timesert thread repair kit and went about installing the insert, badly as it turns out, since it does not hold under torque (35FT/LB) and has started pulling out.

    What to do now? Try an oversize hole for a 12mm timesert or go with a helicoil if it goes in the existing hole which was drilled out to 13/32.

    I had to remove the engine stand bracket to access the hole and found I had to remove the flywheel as well to get a drill close so the logistics of this thing are hell.

    Thanks,

    J P
    J P
    69 911T 2.4L w' 2.2S/E cams/Webers

  2. #2
    You should be able to install an 12 X 1.50 insert, into which you install a 10 X 1.50 insert to get back to original size.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  3. #3
    Banned
    Join Date
    Nov 2004
    Location
    Scottsdale, AZ
    Posts
    9,752
    Mag is so soft it's imperative that you don't allow the bit to wander. Heli-Coil is next. After that it's onto the big, ugly head stud insert available for VW cases.

    If you have an old trans case lying around use it as a pilot guide. Good luck.
    Last edited by Chuck Miller; 03-11-2019 at 04:16 AM.

  4. #4
    A helicoil uses the same STI tap size as a standard Timesert. The nominal drill size is 10.3mm.

    If there is sufficient material I would try an E-Z Lok insert which uses a coarse 9/16-12 thread and has a tap hole size of 31/64"

    https://www.ezlok.com/ezlok-insert-650-10

    The coarse thread of the insert will be helpful into a soft material.

  5. #5
    Member
    Join Date
    Jun 2015
    Location
    Connecticut
    Posts
    51
    Thanks for the ideas. I am going to try using the 14mmOD/10mmID case savers found on this site https://www2.cip1.com/SearchResults....rch=case+saver. They have a 2.0mm coarse outside thread to bite into the magnesium and the 25mm length should give max strength.

    I will use the half moon engine bracket holding the transmission now as a guide for drilling. Only difficulty I foresee is driving the insert into the hole because the lip of the case interferes with a lock nut on a threaded bolt approach.
    J P
    69 911T 2.4L w' 2.2S/E cams/Webers

  6. #6
    Senior Member
    Join Date
    Oct 2010
    Location
    South Carolina
    Posts
    159
    TIG welder, magnesium filler rod and a preheat oven. Might want to look for someone that knows what they're doing and be sure to weld in safe place if you go that route.

  7. #7
    Restoration newbie.
    Join Date
    Jun 2007
    Location
    San Francisco
    Posts
    1,484
    Big-sert https://www.threadkits.com/big-sert/...-series/50153/

    If it were me I'd be inclined get some steel plate to make a fixture and get a mag-drill onto the case. I'm just and amateur and I'm sure the pros who have already chimed in just hand drill it.

    andy
    67S in pieces
    EarlyS: 1358
    [SIGPIC][/SIGPIC]

  8. #8
    Member
    Join Date
    Jun 2015
    Location
    Connecticut
    Posts
    51
    Update

    It took a while to gather up the parts but this time it worked. I needed a 12mm drill and 14-2.0 tap size but key was getting a proper tap wrench. Gearwrench makes a nice set with a ratcheting wrench but trust them to make you buy a bigger handle for the larger tap. I used a builders square as a guide to line up the whole. The 10mm driver from the time sert kit worked well for the insert. Insert is holding 35 FT/LB without slippage. Hole under repair is on the left.

    Name:  P1050189.jpg
Views: 186
Size:  101.8 KBName:  P1050191.jpg
Views: 160
Size:  125.1 KB

    Had not heard about a mag-drill before. It would have been difficult adapting a fixture in this instance.
    J P
    69 911T 2.4L w' 2.2S/E cams/Webers

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.