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  1. #1
    Z06 to Raped Ape
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    Lifted head or blown head gasket on new motor??

    I just finished getting my car back together with a freshly rebuilt motor. After taking it on its second ride for the break in period, I got on it to load the motor a bit and suddenly saw a huge white puff of smoke behind the car. I popped the hood when I got home and coolant had spewed all over the passenger side header. I checked the oil dipstick and it looks fine along with the coolant itself. I started it back up with the cap off the reservoir and no bubbles came up. I also don't hear any signs up a blown head gasket.

    What just happened with my new motor?? I don't understand and I'm extremely discouraged right now




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  2. #2
    SVT God cobracide's Avatar
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    To be absolutely sure.. Dump your oil and coolant and you should find out. Examine the oil for coolant and coolant for oil. It could be that the coolant cap popped some pressure and coolant.. vaporizing it on the engine causing the steam or white puff you saw. Also you can read your plugs. Check it out and report back.
    Last edited by cobracide; 04-15-2012 at 10:15 AM.

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  3. #3
    Just A GT 1QUICK10TH's Avatar
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    make sure your intercooler pump is working, if its not and you are using an aftermarket i/c tank it will create pressure and blow past the cap. one time i forgot to turn mine on and when i got on it coolant blew through the cap, through the hood vent, and onto the pass side of the windshield. since your problem is on the pass side and the radiator tank is on the driver side i dont see how you could get engine coolant on the pass header unless its coming directly from the head gasket which would be pretty obvious.

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  4. #4
    SVT God SlowSVT's Avatar
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    Nothing worse then a new engine giving you grief

    Did you check the head and deck for flatness at rebuild time? That or perhaps a head bolt assembly issue (improper torque or tightening sequence).

    What I would do is clean the side that got sprayed and run the engine and see if you can isolate where the coolant is coming from. Sounds like a head gasket issue though if it did that only when you were into boost.

    Side note: A "lifted head" is purely the domain of an engine boosted into the stratosphere running fuel. Somehow I don't think that's the case in a street car while breaking in a new engine.

  5. #5
    All men not created equal jrd699's Avatar
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    Quote Originally Posted by cobracide View Post
    To be absolutely sure.. Dump your oil and coolant and you should find out. Examine the oil for coolant and coolant for oil. It could be that the coolant cap popped some pressure and coolant.. vaporizing it on the engine causing the steam or white puff you saw. Also you can read your plugs. Check it out and report back.
    This

  6. #6
    The Chuppacabra
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    How much boost are you running? What type of head bolts or studs do you have. If your breaking it in and on low boost i doubt the bolts would have stretched enough you make you think you blew a gasket. But hey i guess i could be wrong.
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  7. #7
    Crazy SVT Poster sisky wolf's Avatar
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    Quote Originally Posted by STERLING351 View Post
    How much boost are you running? What type of head bolts or studs do you have. If your breaking it in and on low boost i doubt the bolts would have stretched enough you make you think you blew a gasket. But hey i guess i could be wrong.
    Puff of white smoke...sounds like cracked or broken oil ring...I went thru 4 motors in 3 years

  8. #8
    SVT God SlowSVT's Avatar
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    Quote Originally Posted by sisky wolf View Post
    Puff of white smoke...sounds like cracked or broken oil ring...I went thru 4 motors in 3 years
    That wouldn't account for coolant spewing out the passenger side head.

  9. #9
    Z06 to Raped Ape
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    Here are the spark plugs from the passengers side, all dry:



    Checked both the radiator and IC tank caps and they were tight. Both are also stock. I don't believe it was coming from here because there was no coolant in the front or top of the motor, only down by the headers and along side the inner wall. It definitely looks like it sprayed hard and only happened when I got into some boost, I think it was about 7 lbs if I recall correctly. I see no leak while the car is just idling or not under boost.

    The motor was rebuilt by John with Modular Performance. ARP head studs were used with Felpro MLS head gaskets. I'll be reaching out to him soon but wanted to confirm the problem before going down that path.

  10. #10
    Crazy SVT Poster sisky wolf's Avatar
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    Quote Originally Posted by SlowSVT View Post
    That wouldn't account for coolant spewing out the passenger side head.
    Your right..missed that..

  11. #11
    Z06 to Raped Ape
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    also, I'll be changing the oil/coolant this week so we'll see how it looks. If both of these fluids look fine, what could that mean?

  12. #12
    Rookie SVT Poster Scotty B's Avatar
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    Can you do a compression test or leak down test?
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  13. #13
    Crazy SVT Poster big dad's Avatar
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    The first thing that popped into my mind was an AC line let go along the frame rail, that would explain the smoke and evidence on the right side header. Also it has a green dye and can look like antifreeze.

  14. #14
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    Get on it 1more time like you did before and see if it does it again.
    my old motor once did that had coolany out by the. IC cap.
    Goodluck man hope its all good.

  15. #15
    Crazy SVT Poster My96z's Avatar
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    Did it overheat? My signs of a blown headgasket were overheating. The combustion gasses were leaking into the coolant passages. To confirm the headgasket, I tried a block tester kit but that didnt work too good because the coolant resivoir is so far removed from the leak. I wasnt getting any bubbles from the resivoir either.

    I found mine by doing the coolant bleeding procedure on the cross over pipe. Once the motor heated up, I would get small bubbles during the bleeding process. I would also get lots of air (combustion gas)come out whenever I would run the car and barely crack the plug. If the cooling system was good, it would only be water coming out.

    Meanwhile the car would not smoke. After awhile, when I took it in to get fixed the car slowly started to smoke more and more.
    Last edited by My96z; 04-16-2012 at 12:08 AM.
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  16. #16
    Z06 to Raped Ape
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    Quote Originally Posted by big dad View Post
    The first thing that popped into my mind was an AC line let go along the frame rail, that would explain the smoke and evidence on the right side header. Also it has a green dye and can look like antifreeze.
    I think you might be on to something!! While I was cleaning it up last night I noticed that it was more of a neon green and the coolant is a darker green. I'll check things again today and will see... I'm really hoping this is it.

  17. #17
    I KNOW SAUL 03cobra#694's Avatar
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    As mentioned above, is your IC pump working?

  18. #18
    Z06 to Raped Ape
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    Quote Originally Posted by 03cobra#694 View Post
    As mentioned above, is your IC pump working?
    I can see the coolant swirling in the IC tank so I'm assuming it is. Still gotta change the oil and coolant to verify everything but I think this might have been an AC line that let go... I'm praying it is.

  19. #19
    I KNOW SAUL 03cobra#694's Avatar
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    Hope so too. AC not blowing cold and the compressor not turning on?

  20. #20
    Z06 to Raped Ape
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    Quote Originally Posted by 03cobra#694 View Post
    Hope so too. AC not blowing cold and the compressor not turning on?
    Just turned on the AC and it doesn't seem to be working... blowing hot air. I also noticed that one of the lines runs right up against the header. It's covered in some heat shield wrap but I'm wondering if it got to hot and burst that one time I got on it. I'll go get the system pressure tested.

  21. #21
    Rookie SVT Poster 04yfzkid's Avatar
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    Having a similar problem too. It's only happened twice over a 1 year period with the car being driven every so often on the weekends. Once was after a 30 minute drive and then got on it through 3rd and into the top of 4th. When we were done there was a mist of coolant on the windshield. This was a couple drives after new head gaskets. Second time it happened was the other day. Car was idling for a while, did a couple quick pulls and the same thing. A light mist on the windshield. Hoping it's not a head gasket. The IC pump seems to be working well and was brand new a year ago. I don't understand how it just randomly does it when the car gets driven the same every time it comes out (who can't have a high hp weekend car and not get on it lol).

    The blower is coming off as I type this and probably the whole motor too for head gaskets to be on the safe side. If we notice anything, I will keep you posted. Sounds like yours is just an A/C line which seems to be the better then expected.
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  22. #22
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    Quote Originally Posted by fbody83 View Post
    Just turned on the AC and it doesn't seem to be working... blowing hot air. I also noticed that one of the lines runs right up against the header. It's covered in some heat shield wrap but I'm wondering if it got to hot and burst that one time I got on it. I'll go get the system pressure tested.
    The metal AC line in my Fox rested up against the passenger side header and through time it melted a pinhole in it and the refridgerant leaked out. If your compressor isn't turning on your system is most likely low on 134..

  23. #23
    SVT God Blueline's Avatar
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    You know when you first posted this my first thought was a leak in the A/C system. The oil that is used in the system is green and can be mistaken for coolant. I bet thats what sprayed all over the side of the motor, good luck!

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