Help me please,
I have twin 240hp turbo Perkins (1986, 3,600hrs).  One engine will over heat
at rpms over 1,800-the faster, the higher the temp goes.  Both the fresh water
and sea water sides have been checked and cleaned (with solutions), with
little affect.  (I have inspected the tube side of the heat exchangers-appears
OK, but I haven't removed them for shell side cleaning).
Any ideas???
Could this be a mechanical problem that is just causing too much heat for the
cooling system to handle??

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Place your hand on the exhaust elbow or better yet use a heat gun if
available. If the exhaust elbow is hotter on one engine then the other it is
a good possibility that the hotter one is clogged. Salt water remaining in
the exhaust elbow after shut down is boiled away by the remaining heat until
engine cool down. Therefore you end up with crystallized salt in the small
holes inside the exhaust elbow where the engine cooling water merges with
the hot engine exhaust on it's way to the muffler and eventually exits the
stern. If you find salt build up inside the exhaust elbow it can be boiled
out using Muratic Acid. Be careful using this product and follow all
directions to the letter, it is nasty stuff, do not inhale.

DECOY
Grand Banks 42-892