4.3l overheat at low rpms

DMarcel

Member
Jul 13, 2011
74
Long Island NY
Boat Info
2003 Sundancer 280
Engines
twin MCM4.3L MPI V6 220 HP
2003 280DA one engine overheating at low rpms after launching. High rpms everything runs fine. Both outdrives had impellers changed over winter. Changed thermostat and nothing changed.

Finally took it to marine mechanic. Turned out that when I installed one of the impellers the fins were not lined up and that caused the low rmp overheat.

I hope this helps another do it yourselfer.
 

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