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HT4100 4.1, 4.5, 4.9 Discussion, Stripped Head Bolt Threads in Cadillac Engine Technical Discussion; You can do it with the engine in the car. Check out http://jadz.com/2007/01/24/cadillac-...sket/#more-431...
  1. #16
    jadz's Avatar
    jadz is offline Cadillac Owners Fanatic
    Automobile(s): 1992 STS (4.9L, Black on Black)
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    Re: Stripped Head Bolt Threads

    You can do it with the engine in the car.

    Check out http://jadz.com/2007/01/24/cadillac-...sket/#more-431

  2. #17
    MrEldo97 is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    Thank you.

    There is plenty of room to get tools in there to install inserts and so on? What about studs? Enough room, perhaps, for studs? I ask because I'm seriously considering dumping my '97 Eldo for a '89 to '91 Eldo because my Northstar has been such a pain in the a**. As nice a motor as it is I'm sick of the bull s**t I've put up with from it.

  3. #18
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Stripped Head Bolt Threads

    The factory manual for my '85 shows all the inserts, tools etc for repairing the stripped threads. Looks like it would be a real project to do a major overhaul on one of these engines, specially if it need a bunch of the holes fixed.

  4. #19
    jadz's Avatar
    jadz is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    I purchased the official Cadillac engine took kit that had the helicoils and all the tools required to do it. It was probably the easiest part of doing the whole job....

  5. #20
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    Quote Originally Posted by jadz View Post
    I purchased the official Cadillac engine took kit that had the helicoils and all the tools required to do it. It was probably the easiest part of doing the whole job....
    I hope you meant Timeserts.

  6. #21
    MrEldo97 is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    I Timeserted a Northstar would a 4.9 be easier?

  7. #22
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    I think the 4.9 might be able to be done in the car.

  8. #23
    gmp428's Avatar
    gmp428 is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    Gents,
    I've had the pleasure of having to throw heli coils into a 4.9 while still in the car. All the threads i had to fix were thankfully on the side closer to the radiator. I dont think you'd be able to repair any on the opposite side with the limited room back there. Getting the propper tools to get the job done, was the hardest part of the install. If i can remember correctly you have to drill out the threads with a 31/64 drill bit, then tap the threads with the appropriate tap, then use the insert tool to insert the heli coils. it honestly took me about 2 weeks to find all these tools. drill bits had to be bought online, a 9in 31/64th is non existent in any local hardware store. the tap and the insert tool were bought online as well. the insert tool i bought was a 4 inch long platic t-handle looking thing. so i had to cut off the handle, and ghetto fabricate a way to make it longer so that it could reach the threads deep in the block. finding half inch long helicoils took an entire week of calling every fastener shop in the state, and i had to buy a bag of fifty. its been about a year and a half since ive done this but i would be more than willing to give any advice to anyone who has to knock this out. in my personal opinion; id do it to every head bolt, because they are all extremely weak. im pretty sure i still have the tap tool, and plenty of heli coils for anyone who is interested. if you guys have any questions about the process, email me at gmp428@yahoo.com. ill post on here later the exact tools and sizes needed once i check my FSM. GOOD LUCK!!!!!

  9. #24
    beveluv is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    I helicoiled 2 head bolt holes on the back side of my 4.9 while the engine was still in the car with no problem. Yes getting the drill bit and tap extension were a pain to find. Note the the bolt holes that had the problem were on the rear head, but it was two of the upper holes (two of the 3 that call for the highest torque. I dont think the lower holes can be done inside the car.

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