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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  • 2 Post By Close Quarters
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Old 03-22-2014
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Slow speed while motoring

Hello!

1st time going out this season and I have very low speed in forward. Reverse is fine. In fact I go faster in reverse than forward. Over the winter, I would run the engine 30 minutes a week. 10 in neutral. 10 in forward. 10 in reverse. A month ago I started noticing I could only get 2200 RPM's in forward but I never go any higher than that but I still thought it strange. Certainly could achieve higher in rev and neutral.

My boat is a Pearson 323 with a rather new universal M-25XPB with 240 hours and the ZF 15 MIV transmission. My bilge is generally clear but today noticed it had a brownish orange discoloration with a slight foam on top. Not much actually more like a slight skim.

Kinda new to this so not real sure where to start. Hoping it's something simple but probably not knowing my luck.

Any suggestions, tips or hints would be greatly appreciated!

Cheers!

Bob
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Old 03-22-2014
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Re: Slow speed while motoring

Pretty hard to say much without more information......Dale
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Old 03-22-2014
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Re: Slow speed while motoring

can you check the fluid in your transmission? Regular oil in water turns whitish.. but transmission fluid keeps a reddish to pinkish colour like this.

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Old 03-23-2014
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Re: Slow speed while motoring

Are you running the engine in your slip or underway? if the former, I would expect lower RPMs. If the latter, what speed are you making in forward? Sounds like there was a recent change. Could just be an issue with the throttle cable.

As to the stuff in you bilge, could be a number of things. Certainly check the oil levels in the engine and transmission.
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Old 03-24-2014
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Re: Slow speed while motoring

Hey,

Has the prop and bottom been cleaned recently? A typical result of a dirty prop and bottom is slow motoring performance.

Can you at least verify that prop is clean?

Good luck,
Barry
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Old 03-31-2014
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And the winner is. . .

Barnacles! ! !

Diver did the trick and everything is running well! Thanks for all the help!

Bob
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Old 04-01-2014
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Re: Slow speed while motoring

Check your prop pitch.
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Old 04-01-2014
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Re: Slow speed while motoring

It sounds like you've identified the problem, but I'd like to throw out one more thing that completely surprised me. I'd never been able to get full RPM out of my engine since I bought the boat last year. Thought it was an engine issue because the prop is original and the bottom is clean. The throttle cable broke a couple of weeks ago and when hooking it back up to the throttle handle, it had been installed wrong some time before, which meant that the idle position was OK, but it couldn't reach the upper limits. Obviously, a bad PO fix. The engine runs great, hits max RMP, and is burning off some white smoke these days....
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