[AJD] Unstyled B conundrum

[Leigh Darilek]

Mike,

Hello.  My name is Bo.  I live in Texas.  We had a similar problem on a John Deere B Styled 1939.  We found no indicator or timing marks between our governor and the governor drive gear.  We researched this problem and the only reference to timing the governor to the engine was the magneto drive coupler slots are supposed to be horizontal when number one is top dead center and impulse mark is lined up when indicator on side of transmission case.

My son and I are restoring our tractor as a FFA project to show in the San Antonio and Houston Rodeos in February and March.  We have really enjoyed working on the 1939 B and hope to rebuild a John Deere H next for next years shows.

I hope this information helps some.

Sincerely,

Bo



________________________________
From: Mike Scholl <buck69_hunter at hotmail.com>
To: Antique John Deere List <antique-johndeere at lists.antique-tractor.com>
Sent: Sunday, February 1, 2009 5:20:15 PM
Subject: [AJD] Unstyled B conundrum


I looking for an answer to a problem that started in 1945 or 1946.

Sometime in 1945 or 1946 my 1935 John Deere B was fitted with a modified short-lug coupler Wico X magneto, I'll assume to replace its 'problematic' F-M DRV2B.  As many of you are aware of, aside from the lug length, there is also a difference in the lag angle between short and long lug coupler.  

My Wico X has the 6274 short lug coupler, but the lugs have been lengthened nearly 3/8".  I don't know what was done if anything other than the lug lengthening.

In the 30+ years that I've had the tractor, it has always run well, but 2 years ago I decided to restore it so my grandson can drive it in parades and things like that.

Since the tractor will be compared to others of similar vintage, I decided that I'd try to get as close to the way it was when it left Waterloo as my pocket book would allow.  With that in mind, I bought a F-M DRV2B.  It is a good mag the throws a nice spark when I bench test it.  

Here's my problem... When I put it on the tractor I cannot adjust it to where the impulse trips anywhere near "LH IMPULSE".  It's still too cold here in Minnesota to work in an unheated garage and when it warms up I plan to pull the governor case to see if there are register marks on the cam and governor shaft that might show that I am off register.  I've explained my problem to an expert and been told that there is a fair chance that I'm looking in the right direction.

Here's my question... Is there anyone out there that has encountered a similar situation that can say "Yes, this was a common practice" or "No, a single gear tooth off would give you more than the difference in lag angle between the long and short lugs".

Any insight is appreciated!

Thanks in advance,
Mike
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