99 STS Project
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Northstar Engines and System Technical Discussion Discussion, 99 STS Project in Cadillac Engine Technical Discussion; [/IMG] Hopfully tomorrow nite i will have more pics...
  1. #1
    JoeTahoe is online now Cadillac Owners Fanatic
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    99 STS Project

    [/IMG] Hopfully tomorrow nite i will have more pics

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    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 99 STS Project

    Hey, I envy your garage! The lift and everything? Man, that's perfect. Sure wish I had something similar. I am about to drop the cradle off of my Seville, I am ready, tools are ready, but the space is not.

    Anyway, is it easier to keep the calipers intact or take it off and hang on the wheel well?

  4. #3
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    on the seville it is easier to leave them and unhook the master cylinder thanks for the comments on the garage.
    Joe

  5. #4
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    day two[/IMG]

  6. #5
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 99 STS Project

    I see we're going all the way in........

    How many miles are on that motor? You still have the cross hatch marks in the cylinder bores?!

  7. #6
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    130000miles and yes you can see the cross hatch, over all good shape still need to pull the cams and valves. The wierd thing is no threads came out with the head bolts, the 01 ESC I did had one bolt that pulled the threads this 99 looks like the antifreeze and the head gasket did not do well still had dex in it looked clean. This is getting gm rings and new rod, main bearings

  8. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS Project

    Nicely done.

    Sure blows up the high mileage "sludge" advertising, doesn't it !!!!!

    98eldo, There is no GM provision for honing or boring a used Northstar. You just stick new pistons and rings in the block as-is. Take a hard look at those two cylinder bores - that final crosshatch hone is NOT done by hand. The hones are computer-controlled. New pistons now have an anti-scuff skirt coating.

  9. #8
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    sub or any one with some input, I am gonna replace the TCC solinoid in the trans while it is apart and service the trans. The ?? is I use Allison TRANSYND full syn. ATF (castrol makes it) at work in all our Allisons. Do you think useing this at 130000 miles is a good thing or not worth the risk if there is any risk??

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS Project

    Quote Originally Posted by JoeTahoe View Post
    sub or any one with some input, I am gonna replace the TCC solinoid in the trans while it is apart and service the trans. The ?? is I use Allison TRANSYND full syn. ATF (castrol makes it) at work in all our Allisons. Do you think useing this at 130000 miles is a good thing or not worth the risk if there is any risk??
    If the fluid meets GM specs for either DEXRON-III or -VI, why not ??? I mean, I sure wouldn't use Kendall HYKEN 10W logsplitter hydraulic fluid, but LOTS of bottlers sell GM spec'd ATF products.

  11. #10
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    thanks sub this is the same atf that gm uses in there Duramax/Allison HD trucks. I have used it for 10yrs on my own rebuilds and at work on over the road coaches

  12. #11
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    well i got the heads apart and it is bad news needs both exhaust cams, 14 lifters and all exhaust valves. I will have pics up tomorrow. I really need to talk too Jake@Northstarperformance

  13. #12
    98eldo32v's Avatar
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    Re: 99 STS Project

    Sub and Joetahoe,

    Are you guys stating that there's no need to re-hone. I mean yes I can still see the cross-hatch marks but no re hone?!

    Joe, are you putting in standard size bearings? Are you getting the crank journals resized?

  14. #13
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS Project

    98, I have been through the 2002 Seville Helm/GM Seville Service Manual several times this morning - general maintenance and engine repair. It is silent on the need or method to hone the cylinders when replacing rings. It DOES state that any cylinder wear or deformity out of specs is cause for block replacement. It also states that you DO NOT turn the crank journals - if standard bearings will not fit to spec (Plastigage), replace the crank.

    There was another thread on Northstar cylinder honing a couple of years ago and I believe the consensus was, because the Northstar has an aggressive cylinder hone pattern and uses low-tension rings, there should be no need to do a "glaze break" dingle ball job. You could call CHRFAB and ask them if it's necessary in a stock engine. AJXTCMAN seems to have built dozens of Northstars - he'll know too.

    I'll cop out on this one and defer to Jake or one of the other high-volume Northstar repair members. The two Northstars that I was involved in repairing were not disassembled past the short block.

  15. #14
    JoeTahoe is online now Cadillac Owners Fanatic
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    Re: 99 STS Project

    does any one have Left and Right exhaust cams that they are willing to sell, Left #1647437 and Right #1647436 Thanks for any input, Joe

  16. #15
    98eldo32v's Avatar
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    Re: 99 STS Project

    WOW!!!

    I have the 98 FSM. I'm glad I do, but basically you're telling me pertaining to the crank that if standard size bearing DON'T fit, I'm done?! So, all these rebuilds that are going on, are they replacing the bearings with standard size bearings? No clean up of the journals at all?! WOW!!!

    Pertaining to the low tension rings, is that a possible source of the oil consumption at times on some engines?

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