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Old 05-08-2011, 04:57 PM   #1
Mappy
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Join Date: Nov 2010
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Intermittent RPM drop at consistant throttle position.

Hi All

My boat (twin perkins 4.236 diesels) has been developing a strange rpm drop on the starboard engine. It is slowly getting worse and happening more often.

Right now the rpm drop happens about every 20 - 40 seconds and lasts about 2 or 3 seconds. The starboard engine will just drop down about 150 rpm for 2 or 3 secs then recover to whatever it was running at and repeat this over and over.*Occasionaly the*drop will be up to 300 rpm but this*larger rpm drop is maybe 1 out of 15 times*of the usual 150 rpm drop.

It occurs at a variety of running rpm from 1200 to 1800.

Anybody got any ideas where to start?

Thanks

Roger

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