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Over heating issue help... It just won't stay cool!

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    #1

    Over heating issue help... It just won't stay cool!

    Hey guys, so i have an 86 325e that i recently did a 325i conversion:
    (89i wiring harness, pistons, cylinder head, icv, i crank wheel, cps, i water pump pulley wheel, injectors, MAF....the whole shibang!!!)

    I also changed out all of the gaskets, but before I decided to do the swap I was in the process of changing my head gasket as preventative maintenance and the head gasket I used was ordered for an e but I was told that the 325e and the 325i share the same head gasket after deciding to do the swap so I didn't order a 325i specific head gasket.

    So after completing the swap I got the car running, turned over the first time and is idling perfectly. But now it over heats and builds up a hell of a lot of pressure in the hoses. I have the stock 325e cooling system on the car because my buddy did the same swap and hasn't had any issues. The car isn't leaking coolant anywhere, no coolant in the oil, or vice versa, and I've bled and bled and bled and no matter what it over heats.

    No here's the odd thing, it only over heats while being driven. While idling it's fine... I'm so stumped and I really really wanna drive the car after the swap!!! So please if you had this issue or have any ideas, please please please don't hesitate to comment!!! Even the stupidest dea is something I'll try at this point.

    Cooling system parts I've replaced:
    -thermostat ( I've even tried running no thermostat and I get the same result)
    -water pump replaced 5 months ago
    -hoses replaced 5 months ago

    Thanks guys!!!!!
    Tags: None
    #2
    Did you have the head surfaced? In my experience a used head always has some warp and needs to be surfaced.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      You have a very small leak in your HG. Driving the engine would increase the pressure; thus, introducing more air into your coolant system. Did you torque down your bolts correctly? I am afraid that you will have to take the head out again and have it re-surfaced.

      Comment

        #4
        Originally posted by dnguyen1963 View Post
        You have a very small leak in your HG. Driving the engine would increase the pressure; thus, introducing more air into your coolant system. Did you torque down your bolts correctly? I am afraid that you will have to take the head out again and have it re-surfaced.
        Took the head off last night and took a straight edge too it and it looked good, than and super tightened the head bolts starting from the middle and working my way out. Than took it for a test drive and no more overheating! Thanks for the info guys!!! I love rev more and more!!!

        Comment

          #5
          "Super-tightened"? Did you tighten with a torque wrench?

          Comment

            #6
            Originally posted by Alpine 7even View Post
            Took the head off last night and took a straight edge too it and it looked good, than and super tightened the head bolts starting from the middle and working my way out. Than took it for a test drive and no more overheating! Thanks for the info guys!!! I love rev more and more!!!
            If over tightening the head bolts worked, it sounds like the head is warped. Whether your fix will last is an open question.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

            Comment

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