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I have a Perkins engine on My Beneteau first 38 and when the engine is out of gear I get 3800 plus RPMs but when I shift into gear I am lucky to get 2200 RPM. I have A max Prop. Could use some advice. Thanks in advance.
 

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Wandering Aimlessly
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Check and make sure the prop is clean first. Then go from there.
 

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hi ,
I have the same problem with a perkins m20 18hp on my 1993 catalina 270
it revs up fine in neutral but wont go above 2800rpm under load , around 4knots through calm water , which is well below hull speed , the engine is rated 18hp at 3600rpm
two diesel mechanics have been unable to diagnose it , fuel lines filters injectors , hull and prop all good , has anyone any ideas ???
 

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I have a Perkins engine on My Beneteau first 38 and when the engine is out of gear I get 3800 plus RPMs but when I shift into gear I am lucky to get 2200 RPM. I have A max Prop. Could use some advice. Thanks in advance.
john232, is this problem new and it just happen or you've been having it this way ever since ?
 

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It really is imposible to trouble shoot problems without answers to questions so I will just throw out the most simple thing I can think of. :eek:

Cheepest and easiest to fix.:)

Throttle is not opening all the way.:eek:
 

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John, are you out there?

It's been almost a year now, have you fixed your boat?

Hum, maybe he sunked it for the insurance.

I hate one sided trouble shooting.

I have a Perkins engine on My Beneteau first 38 and when the engine is out of gear I get 3800 plus RPMs but when I shift into gear I am lucky to get 2200 RPM. I have A max Prop. Could use some advice. Thanks in advance.
 
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