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Over heating

"I have a 260 inboard and noti

"I have a 260 inboard and noticed the engine temp running above normal. The water pump impellor was replace at the beginning of the season and the manifolds and risors were replaced a few seasons ago.How can the heat exchanger be tested, I'm thinking that maybe its clogged being it's original since '86.Kevin"
 
"Remove it and take it to a ra

"Remove it and take it to a radiator shop for cleaning, pressure testing and repair."
 
"my 89' mercruiser 2.5l i/

"my 89' mercruiser 2.5l i/o overheated after i throttled it high in an attempt not to get stuck in shallow water when i felt the boat bottoming out. As soon as the siren went on i turned the engine off and waited for it to cool before restarting it. Traveled back to the ramp only 200ft away with no prob at a slow steady speed. Recently went back out and boat overheats when i throttle it up for speed, as long as im only idling or traveling slow the engine is ok. PLEASE HELP!"
 
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