Proper Cold Weather Starting

[normde2001]

Norm.....any chance you could post that page. I sure would like to see it.

Nope, it's 750 miles away.

 

[normde2001]

Why full throttle and then pull it back 1/2 way? And do not run a Cold Engine at full throttle? That's what your be doing, Starting and Running it at "Full Throttle" Kind of hard to Turn the key and hold the Throttle Lever. So IMHO. that's must be a Translation error.

That's an OEM manual. Yanmar no doubt has bi-lingual tech writers. You, (I,) can easily throttle back before it reaches full rpm's.

 

[careyo63]

Say the engine is cold and throttle sticks wide open from being Cold,Frozen,Dirty. What are you going to do. Turn the key off

 

[normde2001]

Say the engine is cold and throttle sticks wide open from being Cold,Frozen,Dirty. What are you going to do. Turn the key off

Ask the Yanmar engineer that wrote the manual.:confused3:

 

[careyo63]

Ask the Yanmar engineer that wrote the manual.:confused3:

BS. It was wrote 40 yrs. ago and not going to happen. It says Do Not RUN COLD WIDE OPEN. Not do not Start @ Half Throttle. If it starts And your moving it that Quick what's the difference? There's Not One!!!

 

[normde2001]

BS. It was wrote 40 yrs. ago and not going to happen. It says Do Not RUN COLD WIDE OPEN. Not do not Start @ Half Throttle. If it starts And your moving it that Quick what's the difference? There's Not One!!!

All I know is I ALWAYS start with throttle wide open and NEVER, EVER run the engine wide open. Don't even know what top rpm is.

 

[careyo63]

Starting It full throttle and not running it that way. So your saying You start it with your Left Hand Turning the Key and your Right hand on the Throttle. How do you use the Decompression? With that little finger between your legs???

 

[California]

In my experience on the YM240, 1/3 throttle is all it needs on a cold-weather start. I used full throttle in the beginning as the Operator Manual recommends. The only difference that makes is a huge cloud of black smoke in the moment before I can yank the throttle back to 20%. Starting at lesser throttle makes minimal smoke.

But even using a 100% throttle start, there's time to pull the throttle back before it revs to maximum so I don't think this stresses it the way an automobile engine would go to peak rpm instantly.

Also - the manual says warm up at 1500 rpm. That sounds fast, like its hard on a cold engine. Just above cold-engine diesel clank, maybe 1200 rpm, sounds like less stress.

Last week I started the YM240 with the barn still below 40 degrees after it hadn't been started for weeks. First time in several years it didn't catch instantly. I think the battery was down to about 12.3 volts and I didn't run the Thermostart for the full 15 seconds that I should have. Second attempt after running the Thermostart until I heard the vapor burst into flame, started normally. (I always begin a first start of the day by spinning it with compression released to get oil pressure up, and on every start release compression while the starter turns the engine the first couple of revolutions).

I would have put the 2/10/50 charger on it, let it charge for a couple of minutes, and cranked with the charger set on 50 amp assist to make it spin faster, if that had been needed. Before I replaced the starter and injectors five years ago I sometimes had to do that in cold weather.


The more modern 3-cylinder YM186D starts easily like a car. I use the same procedures but they aren't really needed.

 

[normde2001]

Starting It full throttle and not running it that way. So your saying You start it with your Left Hand Turning the Key and your Right hand on the Throttle. How do you use the Decompression? With that little finger between your legs???

You do it your way, carey, I'll do it mine.

 

[Neat 1500]

I decompress, crank till oil gauge starts moving then release decomp and step on the throttle to get fuel to fire up and then adjust hand throttle to suit. I usually sit it about 1000-1100 rpm as it clanks way less at those revs.