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12-06-2017, 05:50 PM #1Junior Member
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Expert advice neededand components,
New to your forum and in bad need of some advice.
Have 1996 ProMax 225 ,OG367957, it was a performer until I had the water pump impeller replaced and they installed with the incorrect placement of the two gaskets I.E. top gasket placed under the impeller plate and vise verse.
I launched for a test run and immediately hit the temperature warning alarm, back on the trailer dropped the lower housing and discovered their gasket error.
Replaced with proper gasket relaunched but the excessive engine temperature was still there across the complete rpm range.
Put the motor in the hands of a certified Merc mechanic who replaced the entire water pump,stats,poppet assembly, flushed the block, compression test, reset throttle sensor, and gave thumbs.
launched again with no improvement,runs @ 180 to 200 with stats @ 150 lake water 70
what possible damage was done to the power head components as a result from the first over heating event?
In advance
Dundee
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12-06-2017, 07:55 PM #25000 RPM
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Scuffed cylinders,creating drag and heat, pull the headed and look before major damage happens if not already done. Good luck
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12-06-2017, 08:29 PM #35000 RPM
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That sucks man, what did your water pressure look like bfore you took off?
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12-06-2017, 09:00 PM #4
Check it with a temp gun before you get all excited.
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12-07-2017, 09:12 AM #5Junior Member
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Thanks for your reply. I'll give that a try is there any thing that could cause the exhaust diverted plate to fail or crack or is it pretty temperature safe?
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12-07-2017, 09:14 AM #6Junior Member
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I'll buy a Gun and give it a try. Thanks
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12-07-2017, 09:16 AM #7Junior Member
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Running Water pressure about 20 pounds at idle about 4 pounds @700 rpm.
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12-07-2017, 09:21 AM #8Junior Member
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Papa pete would I see a compression difference from a scuffed cylinder?
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12-07-2017, 09:33 AM #9
I'd think if ya had enough cylinder damage to be giving you a temp problem you'd definitely see it on compression. Your pressures sound good. I'm with captain and I would check head temp next to verify you don't just have a sending unit out of wack. Check both heads.
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12-07-2017, 09:38 AM #10
Your original impeller didn't come apart did it? If so, possible a piece lodged somewhere restricting flow to head sender is on?
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12-07-2017, 09:44 AM #11Junior Member
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Impeller was ok however there were small pieces from the gasket found stuck in the poppet but no other gasket particles were found. I'll get a gun and check the block at several locations for any clues.
thanks for time.
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12-07-2017, 10:17 AM #12
Might also be a piece of gasket at the top of water tube were it goes to exhaust plate. Which direction did tech flush block? I would pull the lower and back flush and see if anything comes out.
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Dave Strong, rock liked this post
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12-07-2017, 10:50 AM #135000 RPM
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Should show on compression check, but sometime No! Had one scuffed and dragging so bad it wouldn't hardly idle that cylinder had 150 and the rest 140 so use a boroscope or pull heads
Last edited by pappa pete; 12-07-2017 at 12:57 PM.
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12-07-2017, 02:32 PM #14Junior Member
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12-07-2017, 03:03 PM #15Junior Member
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Would I find any changes from one spark to another if one cylinder was scuffed?
thank in advance
.
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