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  1. B

    3.0L overheating

    Thanks for the reply. Yep, salt water and fresh water run every time i pull it out as it sits on a pontoon with winch. I changed out the manifold 60 hours ago with the new one Merc recommended as it has larger water jacket clearance for salt operation. Thought about blockage but with the...
  2. B

    3.0L overheating

    I give up! LOL 2012 EFI low emission 3.0L Engine overheats and alarms on the water. Gauge shows about 10 mins past 12 O clock on the gauge. No temps shown just a semi circle from 9AM to 3PM so midday 12 is normal. New impeller December last year. I pulled the thermostat, dropped in boiling...
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