99 STS head gasket repair [ in car]
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Northstar Engines and System Technical Discussion Discussion, 99 STS head gasket repair [ in car] in Cadillac Engine Technical Discussion; Hello to all, I have been a member here for a while but until now I've been hiding in the ...
  1. #1
    lembo's Avatar
    lembo is offline Cadillac Owners Member
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    99 STS head gasket repair [ in car]

    Hello to all, I have been a member here for a while but until now I've been hiding in the shadows and getting great advice for you all. A big thank you to all of you.

    I have a time sert question that I hope has a good answer. I have removed the heads on my 99 STS and plan on doing time serts. I remember reading somewhere on here that I could use the TIME-SERT J-42385-2000 kit on the 99. I'm aware the kit is for newer 2000 and up but thought it was only because of the newer models having deeper holes in one bank. Has anyone used this kit on older engines.

    Thanx in advance. I'll post some pics here and keep you posted

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    lembo's Avatar
    lembo is offline Cadillac Owners Member
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140510_184540_265.jpg

    Not bad at this point. Pretty straight forward once the radiator was out of the way. Make sure you use a pulley puller for the water pump pulley. I tried to apply presure and tap it with a hammer and broke the tip off the camshaft. That was an extra $100 on ebay

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    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_121250_562.jpg

    All the head bolts were tight and made a nice "crack" sound when they gave. These are the intake side bolts. No aluminum in the threads but lots of junk.

  5. #4
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_121501_761.jpg

    Same for the exhaust side.

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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_122512_141.jpg

    Lots of carbon on the piston crowns. I think it was due to babying her so she wouldn't over heat.

  7. #6
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_122924_089.jpg

    With the gasket off you can see a lot of buildup in the top of the water jacket. May be due to bottle of miracles used by the previous owner.

  8. #7
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_163008_351.jpg

    Rear head bolts felt tight coming out but looked worse than the fronts. The 5th one from the front is so bad you can barely make out the threads on it.

  9. #8
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    Re: 99 STS head gasket repair [ in car]

    IMG_20140511_201810_659.jpg

    Rear head valves had lots of build up. Black and white

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    Re: 99 STS head gasket repair [ in car]

    IMG_20140512_121911_100.jpg

    Looks like I was leaking coolant at the top corner of #7

  11. #10
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    Re: 99 STS head gasket repair [ in car]

    Very cool! I am sure this will end up being moved to an engine form or something, but I am glad you started it here or I would have never seen it.


  12. #11
    Ranger's Avatar
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    Re: 99 STS head gasket repair [ in car]

    Quote Originally Posted by lembo View Post
    Make sure you use a pulley puller for the water pump pulley. I tried to apply presure and tap it with a hammer and broke the tip off the camshaft. That was an extra $100 on ebay
    Too bad you didn't ask first. We'd have warned you about that.

    I understand that doing it in the car is the hard way. Have you gotten that rear head off yet?

  13. #12
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    Re: 99 STS head gasket repair [ in car]

    Rear head is off. I left the exhaust manifold on it. I have no choice for in car. I'm doing it in a gravel drive way. Any word on the time sert conversion [using the 2000 kit on a 99 engine] I want to start drilling and tapping today. Looks like I just leave the extra stop collar on for all the holes.

  14. #13
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS head gasket repair [ in car]

    Cover EVERY hole, cylinder and passage with duct tape, except for the hole being currently repaired. Long process, but aluminum chips will go everywhere. An air compressor and hand gun are handy ...........

  15. #14
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    Re: 99 STS head gasket repair [ in car]

    I think the only difference between the 2000 and the '99 Timesert kit is the thread pitch. You want the coarser thread anyway.

  16. #15
    lembo's Avatar
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    Re: 99 STS head gasket repair [ in car]

    Thanx Ranger. All covered up and using air gun with long thin tube that reaches the bottom of the hole. I just did 4 and came in for a beer. I'm getting nice curly aluminum off the drill bit and the threads are cutting nice. No powder. Had to buy a right angle drill with a 1/2" chuck this morning.

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