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  1. #1
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    Uneven Cyl. Head Temps

    I thought changing out the thermostat would take care of this issue, but not so much.

    Port side cylinders run A LOT hotter (148-153 deg) than the STBD side (108-113 deg). Ive got good spark on all cylinders, and water flow seems normal. I did remove the water control valve and "upgraded"the thermostats last fall (late Nov.), but the water temperature was so cold, my temps never got above 110 deg - hard to tell if everything was working as it should.

    Since then I have installed a temperature gauge, and discovered this issue testing it out. This time I had the motor on the muffs - not in the lake, but would it make that much difference?

    Guys I hate to keep asking really dumb questions but you're all Ive got!

    Engine: 1990 Johnson GT200 VJ200SLESE


  2. #2
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    Mine runs about 110-130 on the hose during summer. Comes up to 140-145 when running. You are hot on the port side. Pull the thermostats and check them. If they're still good run the hose down that port side through the stat opening and check the flow coming out the lower. With the stats out start motor on the hose BRIEFLY and check the flow. You may have an obstruction. Worst case is pull the head and check.

  3. #3
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    Quote Originally Posted by frederick55 View Post
    You may have an obstruction. Worst case is pull the head and check.
    That would really suck because I JUST did that to change out the powerhead gasket.

  4. #4
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    I'm not talking about pulling the powerhead, just the cylinder head on the port side. Quite easy. Did you use a sealant when you changed the powerhead gasket? Fine if you did unless excess sealant managed to block waterflow somewhere.
    Last edited by frederick55; 06-08-2014 at 06:57 PM.

  5. #5
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    Had a chance to take it to the water yesterday and thought it might change something, but not really. Still runs hot at idle (150's), but cools down to 120's when running down river. At what temperature should I start to get worried, or should I already be worried? What should be the limit when at idle?

    Quote Originally Posted by frederick55 View Post
    Did you use a sealant when you changed the powerhead gasket? Fine if you did unless excess sealant managed to block waterflow somewhere.
    From what I read in the service manual, it said not to use sealant on that gasket, so Im trying to think what else it could possibly be. I dont remember dropping anything large enough to cause an obstruction down into the midsection while the powerhead was off.

    Thanks for the advice, frederick. Since replacing the t-stat didnt help, Ill take that t-stat out and see how the flow is.

  6. #6
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    Sounds like you may have a bad thermostat if it cools down once your up and running the pressure relief is opening up and flowing like it should. Try swapping the thermostats port to starboard and see if the hot bank follows it.

  7. #7
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    Normally if it's getting hot because of lack of water volume it starts on the starboard side because that's the high bank and is water starved first.

  8. #8
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    Quote Originally Posted by wanagofass View Post
    sounds like you may have a bad thermostat if it cools down once your up and running the pressure relief is opening up and flowing like it should. Try swapping the thermostats port to starboard and see if the hot bank follows it.
    yup.thats what i'd do.

  9. #9
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    Instead of swapping, I replaced with a brand new one. Didn't help.

    I have an extra cylinder head gasket so I'll try pulling off the head and taking a look.

    Anyone know what the "limit" should be temperature-wise? Am I over/under/right at it?

  10. #10
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    What if the one you replaced it with has the same problem? Swap the port and starboard thermostats and see if the hot bank follows it.

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