Do some cold weather
starting with my 31 y.o. 3 GM raw water
cooled as I sail March thru Dec. here in New York
on Long Island sound
...and Jan. and Feb. on several friends boats.
As stated heated air in intake great, have used battery
booster with inverter
as no shore power
available. Also have used my portable catalytic propane
heater in engine
compartment to heat up prior to starting.
15-20 seconds with decompression levers off to circulate oil
for better compression
and for health
Start with 3/4 throttle then throttle down when she starts(Yanmar recommends for GM
Very important, really need batteries to crank big time, I keep topped off with solar
panel. Not always the case in cold weather
Also, here in the states, refineries go to winter blend diesel
in the fall, but most of us sailors have diesel
from the summer in our tanks
...I add as much as 20-25% keresone
to my diesel for cold weather as this is what the refineries are doing. Motor starts/runs
happy when cold. If hesitant to do, just ask your local gas station if they went to winter
blend deliveries yet and buy some.
If you decide to flush with Rydlyme heat up motor to operating temp to open thermastat, I always change my impeller afterwards...realize you have to install new now. Also thinking must neutralize rust after flush with baking powder bath. have to check notes or should be in Mainesails instructions.
Have been using above practices for 31 years since boat new, on average 9-10 months
a year with no major repair/replacement and usually running her hard.