[AT] Super M hard to start

[szabelski at wildblue.net]

Should have also mentioned that heavy oil in cold weather will affect starting. I usually change the oil in my H to 10-30W for the winter.

Carl
----- Original Message -----
From: szabelski at wildblue.net
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Sent: Wed, 05 Feb 2020 23:15:54 -0500 (EST)
Subject: Re: [AT] Super M hard to start

I had a similar starting issue with my H, but I have never had the dieseling issue on shut down.

No issue starting in warm weather, but hard starting in cold. 

What I’ve found is that in cold weather, it’s better to start with the throttle set way low, so that you’re no pouring to much gas into a cold cylinder. With the throttle set way low, it usually starts right up after about two or three cranks. Once it starts, it sputters a couple of times when I pull the throttle back, but goes right to normal rpm. 

Cold weather affects how well the fuel vaporizes and you may just be flooding the engine of the throttle is open too much.

Are you sure you’re seeing actual dieseling? Sometimes my H will fire a couple of times after shut down, I believe that’s due to the engine still spinning a little and sucking in a little gas. Not sure that counts as dieseling (???).

I would still do the checks that have been mentioned by others if cutting back on the throttle doesn’t help.
 
Carl
----- Original Message -----
From: Dean Vinson <dean at vinsonfarm.net>
To: 'Antique Tractor Email Discussion Group' <at at lists.antique-tractor.com>
Sent: Wed, 05 Feb 2020 20:28:53 -0500 (EST)
Subject: [AT] Super M hard to start

My Super M is hard to start in cold weather.   It always does start,
eventually, but if the weather is cold it'll take maybe five or six or eight
attempts, with each one resulting in a few pops or a second or two of
running before it dies.   I always think I just need to find the right
amount of choke vs throttle, but I don't know whether I'm really finding it
or whether the engine just gets warmed up enough by the repeated attempts
that finally it settles down and is just plain ready to start.   In warm
weather it typically fires right up with no hesitation.

 

12 volt battery is well charged, and a few years ago I had the starter
rewound for 12 volts, so there's no shortage of cranking power and it turns
the engine over nice and fast (but not crazy fast like it used to with the
12V battery on the original 6-volt starter).    

 

It does have pretty high compression, resulting I assume from a rebuild
shortly before I bought the tractor ten years or so ago, and which helps it
put out about 55 hp on the dyno.  I can't remember the compression numbers
right now, but I remember checking compression after buying the tractor and
thinking "Wow, those are some high numbers, and all four cylinders are just
about dead-on equal."   When hot the engine typically diesels at shut-down
unless I let it sit and idle for several minutes, so I'm wondering if the
hard cold starting is related. 

 

Anybody have similar experiences or recommendations?   The other thing I was
wondering is if maybe the non sequitur is out of adjustment, but I can't
find the factory specs for it in the service manual.

 

Dean Vinson

Saint Paris, Ohio

 

 


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