distributor cap

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dtoots1
350 crawler
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distributor cap

Post by dtoots1 » Sun Sep 02, 2018 2:56 pm

hey guys,
i got tuneup parts for my jd440 from ma deere...go to put the dist cap on and she's off about 45 degrees before..from where my old one sets? what gives...made in china too !!! i put old one back on as not sure new will work. have enough trouble keeping her in shape. i don't have timing light to run that way. way old sets is about like pic in manual at about 1 o'clock new sets around 4 or 5 for first fire?????

Jim B
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Re: distributor cap

Post by Jim B » Mon Sep 03, 2018 6:36 am

Lavoy, or others, may have more insight into this.

What I found is there are two different caps, some designate as 6 or 12 volt. At times I used ignition parts from the local part store on my 430C (6 volt)and I ended up with the wrong cap, like you have, when someone skipped a line in the catalog. The 6 volt cap has a plug wire terminal each side of one clip and the 12 volt cap has both plug wire terminals on one side between two the clips, a 90 degree difference in the terminal locations in the two caps. The 1909008 cap in the JD parts catalog for the 430C crosses to one cap. The other cap, working backwards, I later found was a Delco # 1935038. I put a note in the book to avoid that again. I just ran the Delco numbers on the JD parts site. The 1909008 now crosses to JD part number R44443. The 1935038 still comes up as JD part number 1935038. So they do have two different distributor caps in the system.

Hope this helps you.
Last edited by Jim B on Mon Sep 03, 2018 11:41 am, edited 1 time in total.

dtoots1
350 crawler
350 crawler
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Joined: Fri Nov 30, 2012 8:54 am
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Re: distributor cap

Post by dtoots1 » Mon Sep 03, 2018 8:20 am

ok Jim B,
part i got is definitely 1935038 and is supposed to be for the 12 volt system, cause he specifically asked if it was.....so what it appears is that have to use the 6 volt cap? by the way this cap priced at 24.75. And can the distributer be turned 90 degrees and use the 12 volt cap? If not how do they use them?

And mine is 12 volt w/alternator and separate voltage regulator

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Lavoy
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Re: distributor cap

Post by Lavoy » Mon Sep 03, 2018 9:37 am

There is no such thing as a 6 or 12 volt cap, the only difference is the Waterloo built two cylinders use a different cap, and they just happen to be 12 volt. The terminals are 90 degrees out of "phase" so to speak, and if you use this cap, the engine will only hit on one cylinder. Deal with this frequently, and have for 20 plus years.
The part you have is wrong, I sell the correct one for $10. Any competent dealer parts guy would have looked up the part number and verified he was selling you the correct part.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

Jim B
350 crawler
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Re: distributor cap

Post by Jim B » Mon Sep 03, 2018 11:50 am

dtoots1,
Sounds like you should contact Lavoy for a cap.

Lavoy,
Thanks for the real reason for the two caps.

Jim

dtoots1
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Re: distributor cap

Post by dtoots1 » Mon Sep 03, 2018 4:28 pm

Lavoy, can you send it?

thanks
dtoots1

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Stan Disbrow
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Re: distributor cap

Post by Stan Disbrow » Tue Sep 04, 2018 4:44 am

Hi,

I find on any Old Iron, I have to carry the original part numbers from the PC with me. Better yet, carry the PC in with me. That way we have the original parts drawings to compare with what the computer crosses....

It is rare to find a parts guy these days that know what one of these things even looks like, much less the parts. Try and have one look up a 420 oil filter and see what they hand you. Most likely a tiny thing. See, JD used 420 for a garden tractor long after they used it on what we have. Gets even worse if you start talking 350.....must be 16 different things 350 from Deere. From a chain saw to a sickle bar to a manure spreader to an articulated dump truck. And, there is a crawler in amongst all those somewhere. (!)

And, there is no relationship between the battery voltage and a distributor cap. Coil, yes. Cap, no. There is at least 30,000 volts under a distributor cap. I am guessing the reference was really that between a Waterloo made tractor and a Dubuque made one where these caps were originally used. That would lead to confusion since so many Dubuque made vertical 2-cyls have been converted to 12v from 6v.

Stan
There's No Such Thing As A Cheap Crawler!

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Lavoy
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Re: distributor cap

Post by Lavoy » Tue Sep 04, 2018 8:33 am

I'll try and get it out this afternoon.
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Parts and restoration for antique and late model John Deere crawlers.
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