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Thread: Good ole 86 Van Overheating Problems [seeking advice]

  1. #21
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    Re: Good ole 86 Van Overheating Problems [seeking advice]

    After 8000 miles after rebuild I lost coolant. Adding about .5 quarts per month. Did all the tests stated and found when pressure tested it would hold 15lbs for 15 minutes, then down to 13 by 30 minutes.

    Then I did the head compression tests. Got the tool that Tim recommended. Two squeezes of the bulb and it went from blue to green. So it looks like I have a cylinder leak somewhere. No water leaks anywhere. Every time I fill with coolant it blows it all into the recovery jug but does not suck back in. Now over heating. It never did this. It was always on the very cool side.

    So looks like the head has to come off. When I do that is there anything I should do to the head while replacing the head gasket?

    Thanks

    MT

  2. #22
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    Re: Good ole 86 Van Overheating Problems [seeking advice]

    Quote Originally Posted by MyToy View Post
    After 8000 miles after rebuild I lost coolant. Adding about .5 quarts per month. Did all the tests stated and found when pressure tested it would hold 15lbs for 15 minutes, then down to 13 by 30 minutes.

    Then I did the head compression tests. Got the tool that Tim recommended. Two squeezes of the bulb and it went from blue to green. So it looks like I have a cylinder leak somewhere. No water leaks anywhere. Every time I fill with coolant it blows it all into the recovery jug but does not suck back in. Now over heating. It never did this. It was always on the very cool side.

    So looks like the head has to come off. When I do that is there anything I should do to the head while replacing the head gasket?

    Thanks

    MT
    Hi, MyToy

    Replacing head gasket takes ton of time and works, so if your problem is not too serious , you can take the simple way like this.
    How is not "so serious"? It is when:
    1. The engine still run when you stop it when you found the temp become too high
    2. The lub oil in tank still not become milky color
    3. The bubble in the refill cap off hole does not crazy boiling (like exploding) while you start the engine and it run with a cap off
    If it really is, then you can do simple way like this: just tighten the bolts and keep the head.
    1. Remove the upper half of intake maifold,
    2. Remove the hose and the engine cap - then you can see all the valves and 10 bolts
    3. Tighten the 10 bolts with a torque wrench at right torque set (88N/m)
    4. Re-assemble every thing - refill cooling water
    5. Start the engine and check if the water inside the cap-hole surface smoothly without any bubble.
    6. Make a test run around to check if it's OK
    This can save time, but with a risk that the problem still there, then you should carefull check the temp gauge while driving.
    If it does not work, then you have to replace the head gasket with a new one.

    Good luck.

    NDS

  3. #23
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    Re: Good ole 86 Van Overheating Problems [seeking advice]

    Thanks NDS

    The guy that did the engine removal and install was informed a month after it was done that I was putting in water every month. So he knew. So I went back to him and he said that he would check it again and pull the head to see where the problem was. He did mention the idea on the head bolts, but in a not so good way. He told me that if it did fix the issue it would be short lived. He advised I get rid of the van. That is not what I wanted to hear now that I have sunk so much into her. The machine shop was the problem but he said that now it has been so long they would never help.
    So I have a choice. Tighten them and never go back or have him do the work and I pick up the head costs and still never go back

    So I need to find a good shop that can test the head and do what ever it is they do when a gasket is replaced. I am in Florida and heard that there was a shop in Sanford that has done these. Just don't know who that is.
    Anybody out there know please give a screen. Or if anyone knows of a shop that is good for the 4Y please chime in.

    MT

  4. #24
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    Re: Good ole 86 Van Overheating Problems [seeking advice]

    Here lies your biggest problem: You are in Florida! Sorry, and welcome to the club.
    LG.
    "perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." A. de St Exupery.

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