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235 straight 6 running hot....DRIVING ME NUTS!!

Discussion in 'The Hokey Ass Message Board' started by PossumJR., Sep 29, 2012.

  1. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    Ok heres the deal, I have a 235 straight 6 out of a 58' impala in my little A Model pickup. Runs great when idling or stop and go traffic but at steady highway speed(45-65) the tempature steady goes up. Heres what ive done to try to fix it. First, it has no thermostat so i thought maybe the water is moving too fast so we put a restrictor in the neck,didnt change a thing. Next we thought maybe we just dont have enough radiator. So we found a bigger one and put it in(holds about 2 1/2 gallons of water. That still didnt change anything. Thought maybe the belt on the water pump was slipping since it was a little old, so we replaced that also......no change. It has the max size electric fan that i can get on this radiator and the water pump seems to be working at full pace. Keep in mind it runs great while sitting at idle. It doesnt run hot until you hit a long stretch without bringing the rpms down. Any ideas because im stumped? its creeps up to about 220 or 230 on long runs(about 5 or 10 miles non stop)
     
  2. Modest
    Joined: Sep 22, 2012
    Posts: 7

    Modest
    Member
    from Loomis ca

    Retard your ignition a little and get an oil cooler if need be.
     
  3. carlisle1926
    Joined: May 19, 2010
    Posts: 536

    carlisle1926
    Member

    Vacuum advance might not be working. Keep in mind, that you should be able to watch the distributor rotate a few degrees as soon as the engine cranks. If it doesn't, you have a bad vacuum advance or the vacuum advance assembly is misaligned with the distributor or jambed up with filth and not allowing the distributor to rotate.

    Also, I had over tightened the valve lash on my 235 years ago to the point that they almost no clacking sound at all. I had the valve clearance to tight. Mine would run fine at idle, but as soon as I drove at speed, the engine would boil over.
    Of course the other possibility is a cracked head allowing hot gasses into the water jacket.
     
  4. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    use a thermostat
     

  5. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,953

    gas pumper
    Member

    The one in your avatar ?

    Take off the sheet metal grill and don't run the fan on the highway. See what happens.

    You have enough airflow at slow speed, but not enough at higher speeds when you shouldn't even need a fan. The ram air ought to keep it cool.

    retarded spsrk makes it run hot, as does way too advanced. Get the timing right and make sure the vac advance is working and the mechanical advance in the dist.
     
  6. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    ill look at this stuff. I have no way to put a thermostat in it because the way the water neck is made
     
  7. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    I have run it with the grill shell off and it still ran hot but i have not check the timing. Im going to do that this evening
     
  8. dirt t
    Joined: Mar 20, 2007
    Posts: 4,660

    dirt t
    ALLIANCE MEMBER
    from Kingman,AZ
    1. HAMB Old Farts' Club

    All of the above plus have a radiator shop test your coolant for exhaust gas.
     
  9. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    the fluid is moving to fast and does not stop / slow down in the rad..
    to get its turn at cooling off....
     
  10. boooooob
    Joined: Sep 14, 2012
    Posts: 38

    boooooob
    Member


    Which way is your electric fan (what is max size) mounted, in front or behind (blow or suck), how are you controlling the fan (what kind of thermo switch in fin or in radiator or block),,,,,is it coming on...... radiators usually don't work too good without some sort of shroud.
    Are you low on fluid all the time.....white smoke, leaks, contaminated oil??

    boooooob:)
     
  11. fnla39
    Joined: May 25, 2008
    Posts: 109

    fnla39
    Member

    Is this something new, or have you driven it for awhile and this started? What type of water neck are you running that you can't put a thermostat in?
    I had this problem and went as far as tearing engine down and replacing gaskets after boiling mine at least a dozen times only to discover it was a bad thermostat, which was bad out of the box. You can run a 6 in the winter without a thermostat but it's almost a necessity in summer months.
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 46,695

    squirrel
    Member

    Sure would help to know more about the vehicle. Can you post pics of the fan and radiator setup? how's the rearend gearing? what is the total ignition timing, and does it have vacuum advance? if so is the vacuum working?
     
  13. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    Sorry guys ive been out in my garage tinkering on it ill post some pics in just a few i did mess with the timing and i got it running a little better but did not fix the running hot issue
     
  14. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    To answer some of the questions i have my fan on a toggle switch it is working properly its mounting on the back side of the radiator so it pulls the air through
     
  15. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    Vacum advance is working. Rear gear is not a issue its got a pretty tall gear with a 5 speed behind it
     
  16. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    heres 1 pick more coming.............[​IMG]
     
  17. Bob W
    Joined: Sep 14, 2008
    Posts: 687

    Bob W
    Member
    from Here

    Water is cavatating (air bubbles) in the lower rad hose ? It's an old drag race trick (flex hose) as the air pumps easier than water, not so good on the street some times. The faster you go the worse it gets.
     
  18. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    Get it checked for a combustion gas leakage into the cooling system. Old Chevy 6s are almost as bad as flathead Fords for cracks.Chevys do heads for the cracking. 5/8s -3/4 restricker size if you must instead of a stat.
     
  19. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    run that picture a little to the left so we can see the chevys
    block housing where the thermostat usually goes
     
    Last edited: Sep 29, 2012
  20. 1964countrysedan
    Joined: Apr 14, 2011
    Posts: 1,131

    1964countrysedan
    Member
    from Texas

    Have you checked accuracy of temperature gauge?
     
  21. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    inquiring minds need to see more
     
    Last edited: Sep 29, 2012
  22. diamond jeff
    Joined: Sep 6, 2012
    Posts: 61

    diamond jeff
    Member
    from montana

    x2... or no bigger than a 5/8" hole in restrictor plate
     
  23. This was told to me by an other hamber:
    So a pirate goes to a bar with a boat steering wheel? Stuffed in the crotch area in his pants,so the bartenders asks:
    "why do you have a steering wheel stuffed in your pants?
    Pirate:--its driving me nuts!
     
  24. inthweedz
    Joined: Mar 29, 2011
    Posts: 398

    inthweedz
    Member

    Is your system pressurised?? If you are running a 13lb cap, ( 3 degrees boiling point raised for every 1 lb pressure) Meaning it can get up to 150 degrees before it boils, so your 120 - 130 degrees is ok ..
     
  25. what he said
     
  26. squirrel
    Joined: Sep 23, 2004
    Posts: 46,695

    squirrel
    Member

    The fan probably isn't blocking airflow too much at speed, there's plenty of room aruound it.

    I'll echo the question about if it's pressurizing the cooling system like a leaking head gasket.
     
  27. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    I have a gauge on the water pump and in dash there both reading the same so i suppose they are correct. It is not puking any water i think my next test is to check for air pockets that flex hose may be an issue.
     
  28. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    Heres a pick of the water neck....no way to get a thermostat in there.............


    [​IMG]
     
  29. PossumJR.
    Joined: Oct 26, 2009
    Posts: 423

    PossumJR.
    Member
    from Walls,MS

    i have a restrictor with a 3/4" hole
     
  30. squirrel
    Joined: Sep 23, 2004
    Posts: 46,695

    squirrel
    Member

    have you tried a 1" hole?

    also...did this problem just start or has it always been like this?
     

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