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Engine Overheating Frustration

Discussion in 'Early CJ5 and CJ6 Tech' started by lindafrew, Jul 24, 2005.

  1. lindafrew

    lindafrew New Member

    We are restoring a 1968 Jeep CJ5 with its original Buick V6 engine. We cannot resolve an overheating problem, although we think we've tried everything. New hoses, radiator flush, new radiator cap and thermostat. Water pump is working fine and it has anti-freeze. We are at the point of removing the freeze cap to flush the engine, but can't find it!! Can someone help us locate that, or give other suggestions as to things we might try? It is odd that the car can idle forever and not overheat, but when we take it on the road, it overheats within a few blocks. Any advice would be appreciated.
     
    lindafrew, Jul 24, 2005
    #1
  2. Glenn

    Glenn Kinda grumpy old man Staff Member

    Just a radiator flush might not do the trick. Could be still clogged inside, I'd suggest taking it to a radiator shop and have them go through it.
     
    Glenn, Jul 24, 2005
    #2
  3. 67cj5

    67cj5 Member

    With all the info you gave me I can suggest 2 things. One is a clogged radiator, the other would be incorrect ignition timing. Little known fact the impropper ignition timing can cause alot of excess heat in a motor. Good luck
     
    67cj5, Jul 24, 2005
    #3
  4. Patrick

    Patrick Super Moderator Staff Member

    I agree with both. Check your timing, and have the radiator rodded.....
     
    Patrick, Jul 24, 2005
    #4
  5. lindafrew

    lindafrew New Member

    Thank you. We may resort to that. My spousal unit just removed a bolt in the engine and, as he probed inside, he found a lot of "gak". He found the freeze plug and is in the process of removing it to have a look-see. I appreciate your reply.
     
    lindafrew, Jul 24, 2005
    #5
  6. lindafrew

    lindafrew New Member

    To Patrick, Glenn and Chris. Any tips on removing freeze plugs? Anything we should know? Thanks for all your help. Linda
     
    lindafrew, Jul 24, 2005
    #6
  7. Patrick

    Patrick Super Moderator Staff Member

    Pound a screwdriver or punch into it towards the edge. Hopefully the plug will push in on one side, while the other side pushes out, and you can latch onto it with a pair of pliers........
     
    Patrick, Jul 24, 2005
    #7
  8. GeoB

    GeoB New Member

    Also, don't expect a std flush to be really effective. I hadda use a pressure washer to blow crud out. I did it on a SBC.

    Check total advance to make sure vacuum advance is workin'. Don't stop with just setting initial advance.

    Hey! This is my second post on here! :)

    GeoB
     
    GeoB, Jul 25, 2005
    #8
  9. 66cj5

    66cj5 Jeep with no name

    what pressure is the cap? is the water pump impeller turning the correct way? spark timing okay? front of rad blocked?
     
    66cj5, Jul 26, 2005
    #9