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Northstar Engines and System Technical Discussion Discussion, 99 STS head gasket repair [ in car] in Cadillac Engine Technical Discussion; scaled_image (1).jpg Even with cradle lowered there was not enough room for drill. I dropped the mount and lowered engine ...
  1. #31
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    scaled_image (1).jpg

    Even with cradle lowered there was not enough room for drill. I dropped the mount and lowered engine with floor jack to gain the room needed. Doing this job "in car" is no short cut. It is more work than dropping engine and cradle out the bottom. Something is always in the way
    RippyPartsDept likes this.

  2. #32
    Submariner409's Avatar
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    Re: 99 STS head gasket repair [ in car]

    True bummer ! That 'Sert simply pulled apart. CAREFUL work with an EZ-Out is in order. Jam the remaining TimeSert threads and you have real problems.

    Are those the original TimeSert or the later BigSert ?

    Just as an aside, I (maybe others) wish that you had used Norm's NS300L inserts ................ but, the die is cast.

    www.huhnsolutions.com

  3. #33
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    Re: 99 STS head gasket repair [ in car]

    scaled_image (2).jpg

    With this much room I probably could have done studs instead of time serts.

  4. #34
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    Quote Originally Posted by Submariner409 View Post
    True bummer ! That 'Sert simply pulled apart. CAREFUL work with an EZ-Out is in order. Jam the remaining TimeSert threads and you have real problems.

    Are those the original TimeSert or the later BigSert ?

    Just as an aside, I (maybe others) wish that you had used Norm's NS300L inserts ................ but, the die is cast.

    www.huhnsolutions.com
    These are TimeSert. I can still go to BigSert if necessary. I got a good deal on this kit used on Ebay. I plan to resell it when finished. A bit bummed that I'll have to wait for new serts to come in the mail. Not sure if there is a walk in supplier here in North Jersey. I might consider leaving it and seeing if it torques. It's on the front bank so it would be easy to get back to it if it fails. 75% is still in there and I feel it would do more damage to block threads if I got it out.

  5. #35
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    The original times serts were known to fail, sometimes while torquing the head bolts upon reassembly. Yours failed while threading it into the block, AND YOU STILL WANT TO TRUST THEM?!?!

    The hard part is done, and you need to order new serts now anyway. Just use the better serts or stud it now. Why waste all that labor?

  6. #36
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    Are you suggesting that I remove the 1 bad sert and the 19 good ones? Sounds like that would ruin all the new threads due to the locktite and the bottom threads of the sert being pressed in the block on assembly. Is the tap for studs that much larger that I can retool good threads into the block?

  7. #37
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    You can drill and tap for studs even after using the original Time-serts.

  8. #38
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    Re: 99 STS head gasket repair [ in car]

    Quote Originally Posted by lembo View Post
    Even with cradle lowered there was not enough room for drill. I dropped the mount and lowered engine with floor jack to gain the room needed. Doing this job "in car" is no short cut. It is more work than dropping engine and cradle out the bottom. Something is always in the way
    That's what I've always heard and why I never recommend doing it in car.
    RippyPartsDept likes this.

  9. #39
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    Re: 99 STS head gasket repair [ in car]

    Any tricks or procedure links for installing the overhead cams? Just wanna get it right the first time. I had it all at TDC when I took it apart.

  10. #40
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    Re: 99 STS head gasket repair [ in car]

    Use this diagram for timing.

    Dribble or paint cam breakin lube onto all 32 cam lobes and cam followers.

    Pin the chain tensioners fully retracted, then pull the pins when it's all together. Fill the oil pump with 50 weight oil. Use a full 8 quarts of 10W-30 HD (truck/marine) to fill the sump.

  11. #41
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    Re: 99 STS head gasket repair [ in car]

    That's great info but I was hoping there was a trick to do it from above without removing front cover. I doubt those tensioners will play nice. My day job will put this project on hold for a few days anyway. Thanks again Submariner.

  12. #42
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    Re: 99 STS head gasket repair [ in car]

    Sounds crazy,
    .
    Throw it in reverse now and stud it.

    That is the very reason since studs have hit the scene I wouldn't even think of looking at inserts on this type of job.

    Good luck.

  13. #43
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    Re: 99 STS head gasket repair [ in car]

    Maybe ............ IF you used the GM trick of wire-tying the cam chains they haven't slipped time and the tensioners have not automatically ratcheted out all the way.

    The tensioner and guide slippers are nylon and they wear over time, so should be replaced.

    I incorrectly assumed that you had opened the front (timing) cover to do chain/tensioner work.

  14. #44
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    Re: 99 STS head gasket repair [ in car]

    The front tensioner moves freely. Sound of oil swishing when depressed. I think the rear one is ratcheted out.

    Also new "used" camshaft has a broken timing gear so I need to swap it with the old one. Suggestions on cracking the ?20mm? nut are welcome. [On head, Off head, impact]

  15. #45
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    scaled_image (22).jpg

    On the top left is the famous hollow bolt. As you see it is twice the length of what sticks out. Just an FYI for those trying to clear it.

    On the right you see I'm replacing the pipe connector to the heater core with a standard fitting from Home Depot. I don't trust the original and it looks like it was leaking at some point.

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