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Northstar Engines and System Technical Discussion Discussion, Northstar overheating-Repair in Cadillac Engine Technical Discussion; Originally Posted by Ranger No. Running the A/C should have no effect on the temperature gauge. Mine never leaves 12:00 ...
  1. #31
    04GrandAmGT's Avatar
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    Re: Northstar overheating-Repair

    Quote Originally Posted by Ranger View Post
    No. Running the A/C should have no effect on the temperature gauge. Mine never leaves 12:00 A/C on or A/C off. 236 is too high. The fact that it goes down when you accelerate leads me to think that there is air in the system.
    possible HG failure again? could have been improper hg job done... you never know.


    Need parts for your Northstar Engine? www.northstarperformance.com

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  2. #32
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    Re: Northstar overheating-Repair

    Good point Evrett. Was the HG job done? Where all 20 bolt holes drilled, retapped and inserted or studded?
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    13944707125563.jpg

    Purge line...I disconnect hose from bolt (when engine over 12 oclock)and coolant flow with high pressure.After coolant pee..
    All 20 bolt holes was drilled.HG job done,all gasket seals,thermostat,piston ring...Not sure yet how good
    I didn't check yet nipple from surge tank,Maybe there is blocked.What I found,manifold intake take air.

  4. #34
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    NEVER open a cooling system when hot. The correct way to check the purge line is to disconnect it (when cold) from the surge tank nipple, not from the bolt/nipple near the water pump cover. Yes, you can also check the tank nipple for blockage.

    As Evrett,Ranger and I have asked, were the proper inserts or studs used? They didn't use Helicoils, did they?

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    Re: Northstar overheating-Repair

    Head Bolts are from CCC




    Head bolts are from CCC

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    Re: Northstar overheating-Repair

    OK, questions answered and it seems to have been done correctly.

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    Re: Northstar overheating-Repair

    where alignment dowels reinstalled, ccc doesnt have self aligning studs in the upper 4 corners, could have torqued head down not 100% straight would cause instant hg failure again. by the looks of the last picture there was no alignment dowels installed.

    PS - Drilling and tapping with no cylinder protection not recomended but should be fine because from the looks of it they had it completely apart and were ready to wash it, though by the looks of pic 18/23 looks like there are still alum shavings when they reinstalled the pistons, HOPEFULLY they cleaned those out because those could cause serious cylinder damage! but seems like the HG job was done correctly.


    Need parts for your Northstar Engine? www.northstarperformance.com

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  8. #38
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    Re: Northstar overheating-Repair

    Gino9-

    Never drill/tap an engine block freehand. There is a reason I sell a fixture plate with my kits, the slightest alignment issues shift the stresses in the block. Take it from someone who has experience, doesn't matter what kind of a threading tap you have- bottoming, taper, spiral flute, etc.... you will NEVER thread a hole completely straight without using a guide of some sort. Anyone who wants to argue this point; come to my shop and we will do some experimenting on this.

    I hope all goes well and that you can get that overheating issue sorted out.

    Wishing you the best.

    -Jake


    Need parts for your Northstar Engine? www.northstarperformance.com

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  9. #39
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    Re: Northstar overheating-Repair

    Quote Originally Posted by MoistCabbage View Post

    Before the HGs were repaired, did you use any stop leak products?
    Not me 'but previous owner.

    ----------

    Quote Originally Posted by 97EldoCoupe View Post
    Gino9-

    Never drill/tap an engine block freehand. There is a reason I sell a fixture plate with my kits, the slightest alignment issues shift the stresses in the block. Take it from someone who has experience, doesn't matter what kind of a threading tap you have- bottoming, taper, spiral flute, etc.... you will NEVER thread a hole completely straight without using a guide of some sort. Anyone who wants to argue this point; come to my shop and we will do some experimenting on this.

    I hope all goes well and that you can get that overheating issue sorted out.

    Wishing you the best.

    -Jake
    They used own alignment,so didn't drilled freehand.

    So..what next if job was made correctly?

    Radiator?
    I will go check block surge tank now

    I forgot,they give me 6 months warranty to check everything is ok.

  10. #40
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    Re: Northstar overheating-Repair

    get a cooling system flush done maybe rad has limited flow from stop leak style products.


    Need parts for your Northstar Engine? www.northstarperformance.com

    Evrett, Sales Executive of the SureGrip™ Cylinder Head Stud Kit

  11. #41
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    I think before about this but before HG failure was OK.I will do it....OMG
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  12. #42
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    Re: Northstar overheating-Repair

    Stop leak usually doesn't clog radiators first -

    this is where I have to agree with the usual "check purge line" idea, it is imperative to cooling system operation that the system be free of air.

    Have you done the exhaust gas test after the new build? I hope it is something minor. Nobody wants to do this job over-


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

  13. #43
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    Today I did exhaust gas test.....is ok.Blue colour....what now?
    I found the manifold intake(top right corner) take air and idle is rough.Looks like manifold intake gasket not in correct place or......

  14. #44
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    Re: Northstar overheating-Repair

    Here are your intake manifold "gaskets" - 8 formed silicone seals. If you can see any part of one you have problems.
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  15. #45
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    Re: Northstar overheating-Repair

    ccc studs come with spring loaded dowel pins ,did you use them on the top bank corners?

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