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Results 1 to 6 of 6
  1. #1
    Join Date
    May 2007
    Titusville , FL, United States

    Default "The motor I just bought rebui

    "The motor I just bought rebuilt from a veteran mechanic (72 yrs old) that has been working on them for 20yrs he says and has had an answer for avery question I have ever asked. So my problem is I keep blowing out freeze plugs one at a time as I start to throttle up and get up on plain. The motor will sit and idle for as long as 15-20 minutes and idle in gear with out blowing a freeze plug for as long as I can stand waiting probably ... 10 minutes. Then I throttle up and within 2-3 minutes a freeze plug will blow. I have replaced 1 only, factory. I replaced it with an aftermarket and that one held on the second run another factory one blew. First it was the one behind the oil pressure gauge on the left side. The next one to blow was the third one on the same side.
    I need some ideas of what may be causing it to happen. We have alredy checked the flow in the heat exchanger and while it is sitting and idleing the water is circulating through the motor as needed as far as I can tell.
    What am I missing?
    My mechanic is building me another and wants to swap it out, but it runs so sweet at idle, smoothe as can be. There is a reason it is happening.
    The hoses are lined with wire and not callapsing, it has a new raw water pump and circulating pump. There are no leaks anywhere. Temp. stays stable at idle for up to 15-20minutes of sitting still out of the water.
    Any new ideas will help thank you."

  2. #2
    Join Date
    Feb 2006
    Ladysmith, BC, Canada

    Default "Several possibilities that co

    "Several possibilities that come to my mind:

    1) The plugs are of the incorrect size;

    2) The plugs are wrongly installed;

    3) The block is worn in way of the freeze plugs;

    4) A leaky head gasket. However, regarding this last point, I cannot see the pressure building-up in the engine block cooling spaces to the point of blowing the freeze plugs, as the expansion tank cap would (should) relieve the excess pressure."

  3. #3
    Join Date
    Sep 2003
    New Tripoli, PA, USA!

    Default "Has he tried to epoxy the plu

    "Has he tried to epoxy the plug in? Also, on a Caddy motor I rebuilt, I had to sheet metal screw a lug in that wanted to blow out. Easy to do, and permanent.


  4. #4
    Join Date
    Apr 2007
    Buzzards Bay, Ma, USA

    Default A related question; What is th

    A related question; What is the proper way to install a freeze plug? I have not had good luck in the past and have never really understood how to get it right.


  5. #5
    Join Date
    May 2007
    Titusville , FL, United States

    Default "I believe the best way is to

    "I believe the best way is to use some marinetex, it's an epoxy, in the recess of the motor then place the plug in and hit it directly in the center or as close to it as possible, directly in the center enough to flare the sides out. The instrument you use to dimple the plug should be flat about half the size of the plug. You just want it to expand into the recess."

  6. #6
    Join Date
    May 2007
    Titusville , FL, United States

    Default Something along those lines.

    Something along those lines.

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