Originally Posted by mikeg205
Impeller should be changed every 100 hours or annually... as MC puts it...Blockage of the transmission cooler or a faulty raw water impeller are too-frequent causes of overheating.
running it dry will cause vanes to where causing less water to be pumped into cooling jacket. Rubber against metal no water or lubricant...heat... Impeller - $35, Engine work/replace $3K - $10K, replacing impeller seasonally or every 100 which ever comes first and not worrying about it....pricelesss.
Funny thing is I notice my mastercraft manual (2010) says to change the impeller every 100hrs while the Indmar manual says to inspect every 100hrs and change every 2 years.