Northstar overheating-Repair
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Northstar Engines and System Technical Discussion Discussion, Northstar overheating-Repair in Cadillac Engine Technical Discussion; Hello My northstar on seville 2001 start overheating.....and burned oil..... Decision,,Yes I will keep car so have to be repair. ...
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    gino9's Avatar
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    Northstar overheating-Repair

    Hello
    My northstar on seville 2001 start overheating.....and burned oil.....
    Decision,,Yes I will keep car so have to be repair.
    I order head bolts repair kit and head gasket full set from CCC(thank you CCC)
    I left car in garage to repair and......
    One Head gasket burned,the heads overheat(bend) and need new pistons rings.
    Pls any advise on it??
    I Should surface on block engine or heads?(heads on ready done)
    What make pistons ring I should choose?
    Need new Thermostat...

    Engine done 71000 miles....

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    97EldoCoupe's Avatar
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    Re: Northstar overheating-Repair

    Hastings. Did you email us today? We received a pricing request
    -

    -Jake


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

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

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    Re: Northstar overheating-Repair

    Quote Originally Posted by gino9 View Post
    One Head gasket burned,the heads overheat(bend) and need new pistons rings.
    Are you SURE? That's pretty rare.
    97EldoCoupe likes this.

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    97EldoCoupe's Avatar
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    Re: Northstar overheating-Repair

    Ranger is right, warped heads are very rare to see with a Northstar. If the engine has been severely overheated, check the ring lands for cracks. Pre-ignition has been known to do some damage.


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

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

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    gino9's Avatar
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    Yes,I email to northstar perfomance

    And yes warped head.

    I seen some pistons ring on rockauto DNJ and SEALED POWER or from NP

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    FWIW, my engine parts were alright (except a chain tensioner) after being overheated up to 300 degrees. I checked the heads for warping and any other additional damages, but there were none. After the stud repair (and the tensioner of course), the car is running fine with no issues after 8 months and 10,000 miles.

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    gino9's Avatar
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    Hello
    When you do this job is ok to do grinding,polishing surface engine block?on side where gasket??

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    Re: Northstar overheating-Repair

    Do not surface the block or heads. Thorough cleaning with gasket remover only. DO NOT use any form of abrasive pad, sandpaper, or Scotchbrite. Any of those, and Scotchbrite in particular, is death to an engine.

    If you feel the need, have an engine repair shop check the heads for surface flatness. Any warpage is head replacement - you do not resurface these heads due to combustion chamber quench area restrictions.

    Contact 97EldoCoupe concerning block surface preparation. www.northstarperformance.com

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    Re: Northstar overheating-Repair

    Quote Originally Posted by submariner409 View Post
    scotchbrite in particular, is death to an engine.
    amen brother!

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    Re: Northstar overheating-Repair

    As per the GM Service Manual. They say it clearly. Use nothing with a sharp edge- a wooden or plastic gasket scraper is fine. Surface feel is important, surface appearance is not. You should not feel any gasket material left on the surfaces at all.

    Any corrosion spots can be smoothed out with a very, very fine grit sandpaper or surface conditioning disc, but any dust created by this process MUST be removed and not allowed to get into the cylinders or oil passages. If the surfaces is corroded; that corrosion is actually aluminum oxide, a very hard substance (think sandpaper).....you don't want those particals in your cylinders or oil system.

    Any low spots, score marks or scratches will create a potential leakpoint. Be especially careful when removing the alignment pins/collars.

    As Submariner409 and Ranger said; avoid scotchbrite at all costs.

    ----------

    Surface corrosion is sometimes present around cyl #1 because of water and salt (depending on where you live) being splashed up from the RF wheel. But usually not deep enough in to affect sealing of the head gasket.

    Heads can be resurfaced if need be, by VERY little. I believe the limit is .003". Blocks...if you resurface the block you need to run a thicker head gasket to make up for the difference because of what Submariner409 said: you mess with that quench area there will be problems. I suppose you could get away with a bit, but it will play with your C.R. and in that case use the 2004 pistons (GM upgrade). GM upgraded the pistons to reduce cold carbon knock...went from flat top pistons with no valve reliefs (2000-2003) to domed pistons to allow for more room for carbon to build up without slapping the head. Fortunately, the way most of us drive our Cadillacs, carbon won't get a chance to build up


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

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

  12. #11
    gino9's Avatar
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    Ok,tommorow big day..collect car from garage...
    Before collect car from garage what I should check?

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    gino9's Avatar
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    Hi
    When vehicle idling Is

    ForumRunner_20140301_142832.png

    When acclerate back to 90c
    Pls help

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    Re: Northstar overheating-Repair

    Read the sticky posts ^^^ just above this for information on the cooling fan operation, cooling system operation, and gauge indications.

    Your engine may simply have trapped air in the cooling system - proper coolant level, cold, is halfway up in the surge tank. Check the level and add some 50/50 coolant if necessary.

    Search for tips on how to test and clean the coolant purge line and bolt/nipple. Google "cadillac forums northstar coolant purge line cleaning" and/or go through the pages of Cadillac Tech Tips.

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    gino9's Avatar
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    Ok what I found upper radiator hose is not hot enough but when accelerate is very hot.Maybe water pump?

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    Re: Northstar overheating-Repair

    Why does everyone want to blame the poor WP all the time. IF THE WP SPINS, IT'S FINE. Sounds like you may have air in the system. Is the purge line clear?
    04GrandAmGT likes this.

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