I have a 3JH2E, so it is a somewhat different engine. Essentially, I have read
that operating at 85% of WOT will generally give you the best fuel/hp ratio,
and at our maximum continues rated output speed being 3400 x .85 = 2,890. In
reality, I tend to use 2,800, somewhat less yet if I am going to be cruising
for a while and I'm not concerned about speed. However, I'm talking 2,600 or
2,700 and not much below that given my understanding that diesels like to be
run at reasonably full power levels. You can look up your engine in the manual
and get those same specs. All this said, I am not an expert, just someone who
has done some reading, so you get what you pay for... :)
As for steam, if the engine is running below 180 degrees, overheating the
engine should not be a concern. However, the steam indicates poor raw water
flow, and given what you have already checked, I would certainly suspect the
mixing elbow.
Long before I thought about trying to add ventilation, I'd go through the raw
water circuit thoroughly. Bruce Whitmore
1994 C&C 37/40+ "Astralis"
(847) 404-5092 (mobile)
bwhitm...@sbcglobal.net
From: James Bibb via CnC-List <cnc-list@cnc-list.com>
To: Chuck S via CnC-List <cnc-list@cnc-list.com>
Cc: James Bibb <jamesb...@me.com>
Sent: Friday, September 14, 2018 3:50 PM
Subject: Stus-List Yanmar 3gm Ventilation
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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every one is greatly appreciated. If you want to support the list - use PayPal
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