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  1. #1
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    Mercury 200 overheating!!!

    Hi people I new to the site and after alittle help as I'm at a loss! I have a mercury 2.4 200hp and keeps overheating when anything past 4000rpm I have changed water pump,thermostats,head gaskets,poppet valve spring even changed the gearbox for a deep water pick up! My engine is std as dad as I no but I am running the offshore mid section with the new style cowling and help would be great as I'm lost as to what to do next. If you run the engine on tick over its fine as soon as you bring the revs up you can feel the temperature of the water coming of the tail getting hot quick!

  2. #2
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    Need your water pressure readings and actual temps. Without them, it's just guessing and throwing parts at it.
    Living in the Freedom provided by Bud Conner and his fellow warriors.
    R.I.P. my Heathen Brother






  3. #3
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    Quote Originally Posted by Phantom200 View Post
    I am running the offshore mid section with the new style cowling
    One piece adapter?

  4. #4
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    Quote Originally Posted by tlwjkw View Post
    One piece adapter?
    That would be with a big water tube?
    Last edited by Forkin' Crazy; 07-14-2013 at 05:56 PM.

  5. #5
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    Blockage or leak?

  6. #6
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    Quote Originally Posted by Forkin' Crazy View Post
    That would be with a big water tube?
    Depends on tha year............What I've seen stock stuff (T-stats, poppet, no diverters) don't seem ta work well with tha one piece.............
    Last edited by tlwjkw; 07-14-2013 at 07:48 PM.

  7. #7
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    Quote Originally Posted by tlwjkw View Post
    Depends on tha year............What I've seen stock stuff (T-stats, poppet, no diverters) don't seem ta work well with tha one piece.............
    My engine is a 86-88 so quite old has good compression all over 130psi when flat out I have the over 30spi water pressure so no the pumps working I'm thinking of making a plate same as the do on the xr2s on the poppet valve and dump the water outside the tray as I'm thinking I may have a problem with the way it dumps it through the offshore midsection?

  8. #8
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    Quote Originally Posted by tlwjkw View Post
    Depends on tha year.............
    This is referin' ta tha size tube tha one piece adapter plate uses........If your motor is still all chrome and ya gotta one piece adapter ya might oughta set tha whole coolin' system up just like a stock 260 nic motor n go from there..............

  9. #9
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    Quote Originally Posted by tlwjkw View Post
    This is referin' ta tha size tube tha one piece adapter plate uses........If your motor is still all chrome and ya gotta one piece adapter ya might oughta set tha whole coolin' system up just like a stock 260 nic motor n go from there..............
    Yes mines a 86-88 motor chrome boars std with the 20" offshore mid section and cle two gearbox

  10. #10
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    Hi guys any help would be great do you think I have a flow problem between the mid section and power head?

  11. #11
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    Remove the exhaust chest covers and check for blockage in water feed holes leading into block.
    Popey

  12. #12
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    Quote Originally Posted by tlwjkw View Post
    set tha whole coolin' system up just like a stock 260 nic motor n go from there..............
    This is what ya need ta do with a one piece adapter. If ya mix n match coolin' systems ya gonna be chasin' your tale tryin' ta run down problems.............
    Last edited by tlwjkw; 07-16-2013 at 08:05 AM.

  13. #13
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    Ok so we removed the power head replaced the gaskets and checked everything removed the poppet valve completely as its just dumping the water in the the sandwich plate and can't get out only through two tiny holes now there's a plate on the side of the poppet valve and domes the water out side the tray and a second on from the top of the head on the other side went out had good water flow but once again the alarm goes off with 10psi and both pipes pumping water??any help as what to do next??
    Last edited by Phantom200; 07-16-2013 at 04:00 PM.

  14. #14
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    The head were reading about 60-70 when the alarm was going off measured with a infa red

  15. #15
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    who said that 60 to 70 degree's is overheating ?
    that is normal running temp if you have thermostats fitted properly and working good.
    soundd like you have dodgy alarm sensor, as 70 is not overheating surely.
    the average car engine runs at 88deg C, my merc 60 ran at around 70 degC as well.
    my 3 cylinder evinrude runs between 60 and 70 deg C all the time as well.
    i am not 100% on the size of your engine but i wouldnt say its anywhere near over heating, just a dodgy sensor that needs replacing.
    what does the workshop manual say for temp on that engine ?

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