99 N* rebuilt and burning lots of oil
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Northstar Engines and System Technical Discussion Discussion, 99 N* rebuilt and burning lots of oil in Cadillac Engine Technical Discussion; I have went through with the time and money on my NS.The reason i rebuilt it is because of the ...
  1. #1
    NSDeville is offline Cadillac Owners Member
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    99 N* rebuilt and burning lots of oil

    I have went through with the time and money on my NS.The reason i rebuilt it is because of the head gaskets. i did the timesert kit. i started it today and it runs perfect but burns over 1/2 quart of oil in five mins. All 8 pistons are soaked and when i pull the plugs, fresh oil is on them. The amount of smoke out the tail pipes is so bad i cant even describe. everything is new.. rod bearings piston rings.. honed walls.. valve stem seals.. pvc valve.. and more.. im lost... my grand father left me this beautiful deville in show room condition when he died. he told me to never let go of it and fix it in memory of him... i will not stop at anything...

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    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 99 n* rebuilt and burning lotsss of oil

    Who installed the piston rings?

    Were the rings spaced according the manufactures specifications or the factory service manual?

    Usually, the northstar doesn't need a re-hone job because the factory cross-hatch marks are still visible after many thousands of miles.

    The northstar always seems to use a bit of oil, but you've got something abnormal going on.

    Were the valve stem seals the right ones and installed correctly?

    Did you modify or not replace something in the valve covers that fell out? Possibly a baffle?

    Since you had the motor rebuilt, you're going to have to mentally scruntize everything that was done.....

  4. #3
    04GrandAmGT's Avatar
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    Re: 99 n* rebuilt and burning lotsss of oil

    What brand name are the piston rings?

  5. #4
    amunderdog is offline Cadillac Owners Enthusiast
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    Re: 99 n* rebuilt and burning lotsss of oil

    I see this as your first post
    Hi
    You had it rebuilt or you rebuilt it?
    My 2 cents
    If you had it rebuilt - contact the rebuilder
    If you rebuilt it - Find a shop that speaks NorthStar and pay them to correct the motor about 3k.

  6. #5
    JoeTahoe is offline Cadillac Owners Fanatic
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    What rings were used and were they installed correctly. I have totally rebuilt 2 Northstars and used gm rings and oil usage is minimal

  7. #6
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    Re: 99 n* rebuilt and burning lotsss of oil

    You honed the cylinder walls? That may be your problem. That is NOT recommended. Might consider a compression test.

  8. #7
    Ranger's Avatar
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    Re: 99 n* rebuilt and burning lotsss of oil

    Quote Originally Posted by 98eldo32v View Post
    Usually, the northstar doesn't need a re-hone job because the factory cross-hatch marks are still visible after many thousands of miles.
    Here's one at 131K and anther at 170K.
    Attached Images

  9. #8
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    Re: 99 N* rebuilt and burning lots of oil

    If the #2 piston ring (second compression ring) is installed upside down it acts like an oil pump - those rings have a tapered face and MUST be installed with the dot side up - their proper name is "oil scraper ring".

    That's probably most of your oil problem right there.

  10. #9
    97EldoCoupe is offline Owner of Northstar Performance
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    Re: 99 N* rebuilt and burning lots of oil

    What did you do with the top end? What rings did you go with, what hone/coarseness of grit (eg. 240 grit), what pattern? Did you check the end gaps of the rings and adjust prior to install? This is all vital information in determining the cause of consumption. Was there any rusting/pitting/scoring in the cylinders? Any wear or out of roundness?

    Make very sure oil level is correct (goes without saying) and not overfull.

    We will try to help.

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    Re: 99 N* rebuilt and burning lots of oil

    Don't want to hijack this thread, but haven't seen you in a while Jake. Hope all is going well.

  12. #11
    NSDeville is offline Cadillac Owners Member
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    Re: 99 N* rebuilt and burning lots of oil

    ok i rebuilt the engine myself. i had my local machine shop clean my heads and block and deck everything to spec. i bought my rings from ebay using brand sealed power. i spaced the ring gaps accordingly. my gasket kit i bought had the wrong timing cover gasket in it... was for the wrong year. i knew something was wrong because the kit was labeled northstar 99-04? wasnt there differences? anyway im really leaning towards valve stem seals. i ran the car again today and had it running at 3000 rpm to see if it would clear or whatever. i only did this for less than 5 mins.. i shut it down and had a oil spill from my tail pipes about 3x5 foot big and i was down 2 quarts in my crank case... something is VERY wrong. i will do a compression test tomorrow and post. thanks everyone for the feed back.

  13. #12
    stoveguyy is online now Cadillac Owners Connoisseur
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    They did ur heads? Were cams installed when they went to shop? If they tore down heads, did they put valve stem seals back? Maybe they forgot? Sounds like u need to pull pistons and recheck rings? Than mic cyl diameter? Or check cyl wall surface texture.

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    Submariner409's Avatar
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    Re: 99 N* rebuilt and burning lots of oil

    I told you there is a chance the second compression rings are installed upside down. Can you absolutely verify they were installed dot up ???

    That is the ONLY way to pump that much oil out of the engine in such a hurry - valve stem seals would contribute, yes - but not that volume.

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    Re: 99 N* rebuilt and burning lots of oil

    Quote Originally Posted by NSDeville View Post
    i ran the car again today and had it running at 3000 rpm to see if it would clear or whatever. i only did this for less than 5 mins.. i shut it down and had a oil spill from my tail pipes about 3x5 foot big and i was down 2 quarts in my crank case... something is VERY wrong.
    Holy Exxon Valdez Batman! I'll say something is very wrong. That's not burning oil, that's hemorrhaging.
    97EldoCoupe and MoistCabbage like this.

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    Quote Originally Posted by Ranger
    Holy Exxon Valdez Batman!
    LOL!!!

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