GL: engine over heating

[gdostal at juno.com]

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??

_____________________________________________________________
Click for free info on marketing degrees and make up to $150K/ year
http://thirdpartyoffers.juno.com/TGL2121/fc/Ioyw6i3l7sSSpALX8Zv84b8U5mTRVVeZc
ebt4sUXpGzw2prvuvfyyE/