Josh, Are the rpm numbers for a specific engine or for general reference? I 
have a 3HMF, 3-cylinder, normally
aspirated, diesel, engine, rated to produce 27 hp at 3200 RPM, so I run at 
2300-2400 rpms....am I doing this wrong? 



Thanks

 


Richard
s/v Bushmark4: 1985 C&C 37 CB; Ohio River, Mile 604; 


Richard N. Bush
2950 Breckenridge Lane, Suite Nine
Louisville, Kentucky 40220-1462 
502-584-7255

 

 

-----Original Message-----
From: Josh Muckley via CnC-List <cnc-list@cnc-list.com>
To: C&C List <cnc-list@cnc-list.com>
Cc: Josh Muckley <muckl...@gmail.com>
Sent: Fri, Sep 14, 2018 4:07 pm
Subject: Re: Stus-List Yanmar 3gm Ventilation



Engine at 180°F doesn't sound bad.  I believe the steam you see is just the 
effect of cooler surrounding air and water.  The measure of adequate cooling 
which I've heard is, being able to place your hand on the exhaust elbow.  It 
might be warm... Not hot.


Max continuous = 3200rpm
Max 1 hour = 3400
Max instantaneous = 3600


I try to run as high of a load as often as possible.  Greater than 80% load is 
recommended.  2600 is enough.  2800 is even better.  FYI most Yanmar tachs are 
inaccurate.  My tach is 200 rpm slow.


Josh Muckley 
S/V Sea Hawk 
1989 C&C 37+
Yanmar 3HM35F 
Solomons, MD 



On Fri, Sep 14, 2018, 3:50 PM James Bibb via CnC-List <cnc-list@cnc-list.com> 
wrote:

OK…engine seems to run warm/hot…temp is not above 180 but I’m not running at 
3,000 RPM, usually 2800.  …couple of questions….

Lot’s of steam out the exhaust which I believe is more do to the balance of 
coolant water in either muffler or the mixture elbow.  I sometimes remove the 
engine access panels on either side and I notice an easy 5-10 degree drop in 
temperature from the gauge.  

I’ve checked the coolant, impeller, heat exchanger for clear and the thermostat 
last year.  Haven’t checked past the coolant elbow or into the muffer.  

Does anybody have any experience and does anybody introduce a fan back-up 
cooling system into the engine compartment and if so how do they and where do 
they vent on a sailboat through the hull or deck? 

Does the steam indicate overheating or based on temperature am I running fine?  

Other question, what RPM do folks run their engine at for cruising speed?  




James Bibb
SV Darwin’s Folly
1991 C&C 34/36R
Juneau, Alaska



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