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  1. #1
    motokawa's Avatar
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    msx150 overheating

    hi guys, I read a lot of post regarding overheating and still confuse.. my msx 150 has overheat light after 1 min and no flow on the prestone bowl. I removed the thermostat, still no flow , I removed the water pump and check for the plastic gear ..perfect condition.. what else should I check . overheating on the lake or with the hose on the parking .
    I disconnected the exhaust temp sensor , still overheat on the display .
    can be a blocked water heat exchanger? computer? the rpm is very low when overheat happen .

    thanks


  2. #2
    ripcuda's Avatar
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    So... when it says overtemp... and you pull the seat up... does it "feel" like the engine is getting excessively hot?

    So you have no coolant flow into the reservoir bottle? Only at idle or when you rev it too?

    How did you pull the waterpump? Did you remove the engine? I can't imagine getting to it in the hull. The plastic gear that fails with the waterpump isn't the waterpump impeller... it's the intermediate gear that drives the waterpump shaft. You can't see this by pulling the waterpump off. You have to disassemble the whole front covers of the engine to get down to all the gears to see it. Did you do this?

    If all that checks out... guess it could be a bad coolant temp sensor.

    Cheers!

  3. #3
    motokawa's Avatar
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  4. #4
    motokawa's Avatar
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    I did it with engine in the hull
    so no damaged to the plastic gear. And was no flow at all on the expension bowl

  5. #5
    ripcuda's Avatar
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    That's quite impressive that you tore down the whole front of the engine while still in the hull!

    With the intermediate gear in your pic... did you rotate the engine to turn over that gear and see all the teeth? When it breaks it's only a few teeth, not the whole gear (and those teeth could be facing down in your pic).

    It's been shown that you might not see the coolant whizzing into the reservior *at idle*... but it's got to be whizzing hard into the bottle above idle... the bottle is part of the coolant circuit... keeps the system full... gives it a place to burb to.

    So either you have some waterpump failure (and no circ)... or your coolant level is so low it's not flowing... or a major blockage somewhere.

    Cheers!

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