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Northstar Engines and System Technical Discussion Discussion, Sucessful Northstar head gasket repair in a bottle in Cadillac Engine Technical Discussion; yes but I feel as if the solution (k&w nanotechnology) wont clog or do damage. Question: are the cadillac northstar ...
  1. #181
    SpawnX is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    yes but I feel as if the solution (k&w nanotechnology) wont clog or do damage.

    Question: are the cadillac northstar 4.6l heads make from iron or aluminum?
    Do they need to be resurfaced rebuilt once removed?

  2. #182
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Regardless of whether or not it clogs anything, it simply won't work. Once the bolt hole threads fail, there's an ever widening, ever moving gap between the gasket sealing surfaces. You can't seal that. What makes you think this product is different/better than any of the other magic potions out there?

    The Northstar has an aluminum block and heads. Nothing has to be done to the heads.

  3. #183
    SpawnX is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    "The common problem on these cadillac engines is leaking head gaskets. This is due to corrosion of the bolt hole threads in the aluminum block. The head bolt threads pull out of the block and there is insufficient clamping force on the head gasket, allowing it to leak. This is of course more prevalent when driving as there will be more cylinder pressure pushing against the cylinder head. Sealants will not work to seal this type of leak because the combustion pressure will still lift the cylinder head and allow the combustion gases to force their way into the cooling system. The only real fix is to remove the cylinder heads and add steel threaded inserts to the engine block for the head bolts, then install new head gaskets.

    The engine does have to come out of the car to remove the cylinder heads for this repair."

    If my problem is not the bolts then the solution will work. If its the bolts then i will proceed.

  4. #184
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Just be aware that any "block seal" product you pour in will likely leave a very difficult to impossible to remove mess in the block and cooling system components. Trying this before the proper repair may cost you more in the long run.

  5. #185
    SpawnX is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    purge (vent) line is located under the beauty cover? Best way to unclog is to remove and stick a metal wire through the purge line?

  6. #186
    MoistCabbage's Avatar
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    The metal part if the line is under the cover. The part that usually clogs, however, is the hollow bolt/nipple on the water pump cover.

    Have you diagnosed the problem as HGs or not?

  7. #187
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Sucessful Northstar head gasket repair in a bottle

    SpawnX, Have you read the sticky posts and threads just above this thread ? - the ones on head gasket work, temp gauge function, fan function, and cooling system work.

    I'll bet that neither thermostat was faulty. Did you test them in a pan of water on the stove, using a thermometer to check the beginning and fully open temps - 188 and 206 ?

    Stop throwing parts at the problem, perform methodical diagnosis, and do a cylinder block exhaust gas test. Either "rent" the test set and fluid from a large parts store or use this -

    http://www.sjdiscounttools.com/lis75500.html

  8. #188
    Ranger's Avatar
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    Re: Sucessful Northstar head gasket repair in a bottle

    Quote Originally Posted by SpawnX View Post
    "The common problem on these cadillac engines is leaking head gaskets. This is due to corrosion of the bolt hole threads in the aluminum block. The head bolt threads pull out of the block and there is insufficient clamping force on the head gasket, allowing it to leak. This is of course more prevalent when driving as there will be more cylinder pressure pushing against the cylinder head. Sealants will not work to seal this type of leak because the combustion pressure will still lift the cylinder head and allow the combustion gases to force their way into the cooling system. The only real fix is to remove the cylinder heads and add steel threaded inserts to the engine block for the head bolts, then install new head gaskets.

    The engine does have to come out of the car to remove the cylinder heads for this repair."

    If my problem is not the bolts then the solution will work. If its the bolts then i will proceed.
    IF the HG's are leaking, the chances of it NOT being the threads are slim to none.

  9. #189
    mjbrome is offline Cadillac Owners Member
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    When you have the heads off DO NOT resurface! I was told by Tim Carroll himself over the phone when i bought my studs. (Owner opperator of Carroll Custom Cadillac.) There is not enough material there to do so, and the engine won't allow for any damage to happen. The engine shuts down cylinders (limp mode) that won't let it self destruct. He also said just to clean them up and put in the new valve stem seals. I went ahead and had them pressure tested too anyways but was fine. Kind of funny though beacause my heads were in the shop to do everything! I had to call the shop right away to tell them not to resurface. Luckily they hadn't got to them yet! Tim almost yelled at me. Was very stern on the subject. Coming from a guy that does it everyday I took the advice. Look him up on youtube also. Full instructions. *plug*

  10. #190
    ksmay71 is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    Just another update: I put ANOTHER can of crap in the coolant, the coolant-compatible stuff from K&W. Instructions include idling for 30 min. with heater on. Did so, and expected it to get hot. NO HEAT. I think I've clogged the heater core with the stuff.

    So glad I live in AZ.

    I don't recommend this stuff for ppl in cold climates.

    Also, I'm at 9800 miles since my first fix.

  11. #191
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: Sucessful Northstar head gasket repair in a bottle

    hmmm i wonder what post first mentioned that you'll clog heater/coolant passages with that stuff?

    ...

    figures... it was Jake in post #13
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  12. #192
    Ranger's Avatar
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    Re: Sucessful Northstar head gasket repair in a bottle

    Sometimes you just gotta learn the hard way.

  13. #193
    ksmay71 is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    Thanks guys. I'm just going to keep driving the car as long as I can, along with practicing my hand at paint and body work (I fixed some paint damage on the front and rear bumper and I'm going to beat out the dent that totaled the car, then I'll fill it and repaint it). For my own benefit, mostly. It's a car that deserves to look nice, no matter how many miles it has left in it. I'll post some before/after pictures in another thread.

  14. #194
    SpawnX is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    Update!:

    I have not used k&w nanotechnology yet.

    I cleaned the purge (vent) line. It was clogged on both sides sandy orange rusty looking. I used a drill and attached some steel wire and also guitar string. It unclogged the purge line connects to engine by throttle body. As i unclogged, water poured out from radiator. Had radiator drain screw removed due to freezing weather at night.

    Took if for a spin after letting car on for 30 minutes+, drove fine, temp consistently at 1/2 did not go freeway. But when I came home temperature almost hit 3/4 hispeed fans turned on and it went fast down to 1/2. I am not sure why it hit 3/4 so fast it was about 2-3mins in drive idle waiting for sister to move car. I need to do another test drive all water cycles in the cooling system perfect now.

  15. #195
    SpawnX is offline Cadillac Owners Member
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    Re: Sucessful Northstar head gasket repair in a bottle

    Took it for a test drive. Drove 18 miles no problem. Then Temperate hit 3/4 and would not go down.

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