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Old 26-10-2009, 09:45   #16
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Location: West Coast, BC , Canada
Boat: Cascade
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from my Yanmar operation manual

Find your 75-85% mark but....

(3) Are there abnormal vibrations or
Do not operate at speeds which produce
violent vibrations. Depending on the hull
structure, engine and hull resonance may
suddenly become great at a certain
engine speed range, causing heavy


When operating the engine at low
speed for long periods of time,
race the engine once every 2

Note: Racing the Engine
With the clutch in NEUTRAL,
accelerate from the low speed
position to the high speed position
and repeat this process about 5
times. This is done to clean out
carbon from the cylinders and the
fuel injection valve.
Neglecting to race the engine will
result in poor exhaust colour and

reduce engine performance.


Go outside and PLAY!
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Old 26-10-2009, 17:21   #17
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Thanks everyone. This has been helpful. I have found over the last 2 years of owning this boat that the "sweet spot" is around 2800 rpm's. She seems to like this. I just wanted to confirm that I was doing the right thing. Thanks again.

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Old 26-10-2009, 17:32   #18
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not all yanmars are the same

My 4JH3-TE has a continuous output level of 3,700 RPMS. The 4JH4-TE that replaced it a year later has a continuous output level of 3,100 RPMS.

Best cruising strategy for keeping Yanmars happy is to find the continuous output level in your owners manual and run at 80% of it.
cruising is entirely about showing up--in boat shoes.
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Old 26-10-2009, 19:16   #19
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Originally Posted by neilpride View Post
1200 rpms for charging bateries in a yanmar sounds to me wear and tear in the long term, what about 1500 rpms??? Cheers.
It's not just a diesels rpms, it's the load. Most alternators just can't provide enough load by themselves. If they could the engines performance in gear would suffer.
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Old 26-10-2009, 20:03   #20
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We cruise at 2200 to 2500 rpm on our 3GM30F Yanmars. We have 4500 hours on each engine.

Dave -Sailing Vessel Exit Only
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