Since November last year I have noticed problems if the engine is running for more than 15 min at 4800 rpm. It stops with the oil temparature alarm (beeeee), after it takes 2 min to engage the alarm.<br /> - I have cleared whater entry (works a bit better, actually 15 min).<br /> - I have not changed the Impeller.<br /> - Engine has almost 300 hours<br /> - Service done Nov. 2003<br /> - 1996-97 model<br /> - purge cooling system has not been done !<br /><br /><br />Thanks for Any help