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Thread: Thermostat Kit

  1. #1
    Hoganhero
    About a year ago I installed A Rex Marine thermostat kit on my 455. I have it plummed exactly as they instructed and it works well when cruising 160-190 deg. but idling around,ski,..etc gets way to hot 210+! I have to get on it to cool it down. Is this normal? If so its back to the cold block with hot pistons.

  2. #2
    HammerDown
    If ya look at the thermostat you'll see a smal hole drilled in the side....well just drill one or two more around the other side...try it with 1 more first and if needed add the extra.
    I had the same issue and the added hole cured the hot ideling proplem.

  3. #3
    jetblue
    I don't know the setup they sell, but using a 180 stat with 2 5/32" holes and an adjustable relief valve setup, set at 15 psi cruise speed, it's the Bone for Betty. My boat ran so cold, now its' 180 + - 5 degrees, go out and have fun type of setup. I believe it was Rivercrazy that turned me on to the setup. No valves to Dick with, just turn the key. Mcmaster/Carr has the relief for $34.

  4. #4
    Hoganhero
    Ok thanks. Will give the extra hole a try. Just not getting enough H20 in there at low rpms.

  5. #5
    HammerDown
    Originally posted by Hoganhero:
    Ok thanks. Will give the extra hole a try. Just not getting enough H20 in there at low rpms.
    One quick tip...after ya drill that hole, make sure ya de-burr it so the plunger won't stick!

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