4.0 rebuild
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Northstar Engines and System Technical Discussion Discussion, 4.0 rebuild in Cadillac Engine Technical Discussion; so ive decided to just rebuild mine, the whole thing that started the rebuild was some metal and plastic in ...
  1. #1
    aurora guy is offline Cadillac Owners Member
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    4.0 rebuild

    so ive decided to just rebuild mine, the whole thing that started the rebuild was some metal and plastic in the pan. i tore in to it and found no real bad bearing damage, just some signs of overheating. crank and rods in great condition, just gunna have the crank machenied,new bearings and of course gaskets. it all torn apart now, heres a few pics
    pile of parts


    carbon !




    timing chains


    something i found odd, no cam bearings


    also a few questions for you gurus
    1. rod bolts, does anybody make good after market ones ? like arp
    2. you guys know of anywhere to buy bearings cheap, but good quality ?

    thanks

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  3. #2
    JoeTahoe is offline Cadillac Owners Fanatic
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    Re: 4.0 rebuild

    I used gm rod bolts. And Clevite Bearings from Rock Auto

  4. #3
    89falcon is offline Cadillac Owners Fanatic
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    Re: 4.0 rebuild

    Have you though about putting a 4.6 block in it?

    Be sure to get the rods journals checked for roundness before you put it back together....I here the deform....and if they aren't round, you'll be doing it all again soon!

  5. #4
    johnny kannapo's Avatar
    johnny kannapo is offline Cadillac Owners Connoisseur
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    Re: 4.0 rebuild

    What year model is your northstar?
    How many miles?
    It looks pretty good.

    Many here will be interested in following this thread.
    I kind of like how the 4.0L cylinders are so much heftier looking than a 4.6L.

  6. #5
    johnny kannapo's Avatar
    johnny kannapo is offline Cadillac Owners Connoisseur
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    Re: 4.0 rebuild

    Any professional crank/cam grinder will provide you with the proper spec. bearings.

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 4.0 rebuild

    Remember: the GM Factory Service manual says "Do not machine the crankshaft bearing journals".

  8. #7
    JoeTahoe is offline Cadillac Owners Fanatic
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    Re: 4.0 rebuild

    mine had 130000 miles and the crank was still in spec. also if you do rering I have read horror stories on non GM rings, smoking and useing tons of oil. I have rebuilt two Northstars a Eldo and my Sts and used GM rings with great success.

  9. #8
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: 4.0 rebuild

    You have to be careful with the clevite bearings. Great quality- but the thrust bearing sometimes need filing from the backside because of raised edges during the crimping process. I've found a couple that I would not use without a bit of very careful filing otherwise the bearing wouldn't have seated properly.

    From what I can see in the photos that is a 1995-1997.5 Aurora. I think you may be a customer of mine with the initials of T.C.? If so- that timing kit is definitely needed, that lower tensioner looks a bit worn. When you get the timing kit use the bolts that I sent along as the guides are the newer style (1997.5+).

    Looks like a great job so far, should be an awesome car again. The studs finally came in last night so orders are being filled and shipped. Again if I'm correct about who you are, the drilling and tapping kit has already shipped and is on the way so that you can get the block prepared.

    Great job and wish you the best with the build-up!

  10. #9
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    Re: 4.0 rebuild

    Is there anything one can do as far as normal maintainence do minimize the carbon on top of the pistons like the pic's above? I am aware of the W.O.T. procedure, but will one particular kind of gas or oil help to minimize this?

  11. #10
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 4.0 rebuild

    Carbon deposits are, unfortunately, a normal byproduct of petroleum combustion.

    Oil burners and city driven engines (cold combustion chambers) tend to develop excessive carbon deposits. Highway engines and those subjected to occasional "spirited driving" tend to stay much cleaner.

    If you're a tad paranoid, do some Google work on Chevron TECHRON. Used according to the directions it MIGHT help a bit. GM likes the Top Tier gasolines - Google that, too.

  12. #11
    postman2000's Avatar
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    Re: 4.0 rebuild

    Thanks for the tips Sub, I usually throw in a chevron techron every month or so.. Hopefully it helps some..

  13. #12
    stoveguyy is offline Cadillac Owners Connoisseur
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    Re: 4.0 rebuild

    can you include a closeup pic of the piston ring grooves if you can? before cleaning. would like to see if the story of carboned up ring grooves is true. oh, the cam does not have bearings. thats why oil changes are important.

  14. #13
    johnny kannapo's Avatar
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    Re: 4.0 rebuild

    The oil control ring assembly is the the ring that is the most problem. The top & second ring can only build up on the inside vertical groove wall and ring movement would keep these self clean for the most part but the combustion heat & oil presents causes it to bake on hard.

    The 3 piece oil control ring has many areas for carbon to collect. The ring gets stuck and the 2nd ring becomes overwhelmed with oil then up to the top ring.

  15. #14
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    auroradude is offline Cadillac Owners Fanatic
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    Re: 4.0 rebuild

    Why rebuild it? I just bought a brand new leftover Aurora V8 from the Shelby plant, in a crate that says shelby, inc on it. Everything is new top to bottom - can't wait to put it in my car. There is one left, I paid $2000 + shipping for mine, but the last one for sale is bid up to $2700 now plus $400 shipping.

  16. #15
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 4.0 rebuild

    =stoveguyy;2616318 oh,the cam does not have bearings.
    ????? All four cams have line bored bearings - lots of them.

    Pictures ???? Go look at the slew of shots taken by JoeTahoe in his engine rebuild thread. Same engine, only 0.6 litre larger. Plenty piston pics............

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