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OFFICIAL YANMAR WEBSITES
Yanmar Pleasure Boat Marine Engine Help
Overview - Engine Operating Guidelines
If you forget to turn on the raw water supply before starting the engine,
put the engine key on the sea cock every time you turn it off.
When increasing engine rpm take about 10 seconds to move the throttle
lever between low load and full load.
For prolonged running, a pleasure boat engine a good
operating speed is around 85% of maximum continuous rated RPM
(see the engine data plate)
Operating for extended periods below 80% rpm may increase
longevity but the cylinder bores could glaze causing an increase in
oil consumption and blue smoke especially when new. If
you're operating these engines COMMERCIALLY,
different rules apply. For engines without a tacho, run it where it
sings best. If the ship is shaking and growling, alter the RPM. If
the engine VIBRATES unpleasantly
at a particular rpm, don't operate it in that rpm band or it will eventually
break! Yanmar TACHOMETERS usually read about
100rpm too high at maximum rpm so don't
be pedantic about lining up the needle exactly. The latest Yanmar
panels combined with combined tacho & LCD digital hour meter as
fitted to some GM series and all YM and JH4 engines that have a VDO
electronic taho that operates from the flywheel sensor
on GM series and from aletrnator pulse on other models.
I once had a complaint from a customer that his engine used too much oil.(3GM30C) The boat had been shipped to the Kenwood Cup in Hawaii and sailed back to New Zealand afterward. I found out by chance ( yes, that overheard conversation in a bar ) that the boys had been becalmed and motored home from the Fiji Islands with their foot literally hard down on the go lever for 1200 Nm! I gently explained to the owner that if he lined up his Porsche at the end of the motorway, selected low and put his foot hard down, how far did he think he'd go before the engine died, 1200 Nm? We refilled the oil pan and the engine didn't require any further servicing. I'm still impressed!
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