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  1. #1
    Join Date
    Aug 2012
    Location
    Kennewick, WA
    Posts
    7

    Default Overheating even after the shop

    Hey all Just thought i would throw this at you guys and see where it goes. I have a 1991 Supra TS6M Comp and it has an overheating issue. Thus far I have changed the impellar, thermostat, and even taken it to the shop. The shop gave it back and said "it was just a slight clog in the transmission cooling intersection." They said they ran it and everything was fine. I took it out for the first time since they worked on it and suprise suprise 220 sitting at the dock. Didnt even get it off the trailer. IT also has power loss big time (wont even plain) when it starts to get too hot (190 +) Engine is 351W PCM with Holley Double and electric ignition. The exhaust mainfold on the right side has heat exchange from engine while the left does not. dont know what else to look for.

  2. #2
    Join Date
    Jul 2010
    Location
    N.W. Suburbs Chicago, IL
    Posts
    2,307

    Default

    Find the thread that Wotan started about an issue he had that sounds familiar. Have you tried running it on the hose in your driveway or where ever? If you are using a fake a lake, dump a hose from the fake a lake into a 5 gallon bucket and then dump your hose off the house into the bucket, that way you are supplying water but not under pressure. This way you can see up the impellor is able to create enough suction or not and if there is a possible leak in one of the hoses where you are sucking in air.
    '86 Comp TS6M - Reborn 2016
    Riding a HO Sports CX Ski

  3. #3
    Join Date
    Apr 2012
    Location
    Tacoma, Wa
    Posts
    861

    Default

    220 while idling at the dock is pretty extreme. Did you loose a impellor then the heating issue started? Happened to me unfilled I got all of the chuncks out of the pump grate (on its discharge side) and out of the hoses. They were tough to see unless you were looking for them.
    2003 Supra Launch 22SSV
    1986 Ski Natique 2001

  4. #4
    Join Date
    Apr 2012
    Location
    Tacoma, Wa
    Posts
    861

    Default

    An I would call the "shop" and tell them there a bunch of idiots.
    2003 Supra Launch 22SSV
    1986 Ski Natique 2001

  5. #5
    Join Date
    Sep 2004
    Location
    Hudson, WI
    Posts
    2,651

    Default

    I know for a fact that these engines can run without an impeller and just off of the hose pressure. My guess is that this is what the shop was doing. Look for my thread on my pump not priming and read through the whole thing. I can't tell you for sure that your pump needs to be rebuilt (and that's the last thing that I would try) but I did outline and exhaust every other possibility and tried to document it as well as I could.
    Former owner of a 1987 Supra Saltare. Current owner of a Malibu 23LSV.

  6. #6
    Join Date
    Sep 2004
    Location
    Hudson, WI
    Posts
    2,651

    Default

    Former owner of a 1987 Supra Saltare. Current owner of a Malibu 23LSV.

  7. #7
    Join Date
    May 2006
    Location
    Nashville
    Posts
    2,127

    Default

    Did they lake test it or fake-a-lake test it?

    If you paid, take it right back and tell them to fix it right this time, and show them how to truly test it like Wotan does above.

    There could be a number of things wrong. Also, what temp thermostat did they put in it? I've seen garage jockeys put an automotive t-stat in thinking it would be just fine, but once it finally opened up, the engine was too hot, and it was very difficult for it to cool down.

  8. #8
    Join Date
    Aug 2012
    Location
    Kennewick, WA
    Posts
    7

    Default

    Tried all of that guys. I did the fake a lake/hose and bucket still overheats at idle it overheats very slowly under pressure it overheats very quickly. I just replaced the impellar before it went into the shop. I am very upset with the shop since they are one of the major players hear in Tri-Cities. When i picked it up from the shop the guy looked me right in the eye and said "it ran great problem solved" and then i asked him "you tested it under running conditions" he said "yep runs like a champ" So i am going to making a phone call to them and if they don't make it right i will be sure that nobody ever uses them again.
    "None of this will matter when we're famous Rock Stars"

  9. #9
    Join Date
    Sep 2004
    Location
    Hudson, WI
    Posts
    2,651

    Default

    Something is def. up. When you hook it up with a hose (creating pressure through the system) -- does water come out the exhaust BEFORE you start the boat?

    If water is making its way through the system without relying on the water pump, it should not overheat. Concentrate on getting to this point, first. Rule out that there is any blockages anywhere in the system and that water is cooling your engine. Pull all hoses and flush them out. Pull the thermostat and remove it for now. We can walk you through how to troubleshoot this if you're willing to do the work. It's not complicated.

    It might be complicated when we get to how to fix it... but let's troubleshoot first.
    Former owner of a 1987 Supra Saltare. Current owner of a Malibu 23LSV.

  10. #10
    Join Date
    Sep 2009
    Location
    Western PA
    Posts
    491

    Default

    Possible the hoses were reversed on the water pump?
    2004 Supra Launch 22 SSV
    5.7L Indmar Assault
    "One More Hour"

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