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Rebuilt CJ Running Hot at 65mph or higher

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by mherman2, Apr 11, 2008.

  1. Apr 11, 2008 #1
    mherman2

    mherman2 Well-Known Member

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    Hey there,

    I am gently breaking in the rebuilt motor on my KR convert. The temp guage stays in the center when running at 60 mph or below but it I get it to 65 mph or above, it pegs to almost 3/4 to "H".

    My guess is this is a weak fan clutch. Before I take it out and have it rebuilt, any other stuff to check for based on this feedback?

    Mike
     
    mherman2, Apr 11, 2008
    mherman2, Apr 11, 2008
    #1
  2. Apr 12, 2008 #2
    steveshelbymustang

    steveshelbymustang Well-Known Member

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    You may want to give your radiator a look. If it is original it may need a good cleaning, or if its been fixed before some of the core could be sealed off cutting off capacity. Just a thought!
     
    steveshelbymustang, Apr 12, 2008
    steveshelbymustang, Apr 12, 2008
    #2
  3. Apr 13, 2008 #3
    SFM6S2015

    SFM6S2015 Well-Known Member

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    I think the fan clutch would cause it to over heat a low engine speeds not at 65. By the time you get to 65 the air coming throught the grill will far excede the air a fan will pull. I would check the radiator and the advance curve on your dist. I had a FE that would overheat a high engine speed. Found that the vacume advance was shot. After replacing it the engine ran much cooler.

    Larry
     
    SFM6S2015, Apr 13, 2008
    SFM6S2015, Apr 13, 2008
    #3

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