502 cooling
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Join Date: Apr 2014
Location: Cape Coral, Fl.
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502 cooling
Not the usual culprits this time on my 1999 Checkmate 28ft with a single 502MPI. Replaced the raw water pump, thermostat and engine circulating pump, Not a quick overheat. It takes a while to creep up to 165 as thats the thermostat setting. It just continues its slow move past 180 and when it gets to 210 before I shut it down and let it return to idle. Within seconds it returns back to the 165 normal temp. I start this slow 5-10 minute process over again each time. Its like its not getting quite enough cooling volume as it gets to a working load at 3000 to 4000 rpm. I know its vague but all help is appreciated.
Thanks
Scott
Thanks
Scott
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SB (11-25-2020)
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When the line coming from the drive to the transom plate becomes restricted. The salt causes the hose to swell and gets closed off. The new transom assemblies have a different design. This can also be retrofitted. To verify, need to remove the fitting that the water pump hoses is connected to at the transom
Can look like this
This is the fix
https://forums.iboats.com/threads/br...is-fix.680176/
Can look like this
This is the fix
https://forums.iboats.com/threads/br...is-fix.680176/
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brett fiddes (11-27-2020)
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I had similar symptoms, turns out it was scale in the water jackets And exchangers acting as an insulator. just didn’t quite get enough heat transfer to keep cool. Cooled right back down at idle.
suggestions above are good ideas also
suggestions above are good ideas also