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volvo penta web site or forum??? HELP!
This comes a little late but I just saw the string.
I had a similar problem. I would never have found it if a problem had not developed with one of the sail drives.
Zebra muscles in the passages.
The raw water pick up for the Penta is through the sail drive casting. Passages are small and easily blocked.
I solved my problem with new through-hulls and proper sea strainers. FYI, my Volvos are raw rater cooled and must run cooler than units with heat exchangers.
One additional problem was instrument related rather than a real temperature issue. Thanks to lower cost of technology, infrared thermometers are within reach of the do it yourself mechanic. I got one at Sears for ~$50. That helped me see that overheating was not the issue. New sending units fixed the mis-indicating and false alarm.
Works great now.