420C Carburetor

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420C-Mike
40C crawler
40C crawler
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Location: Milwaukee

420C Carburetor

Post by 420C-Mike » Fri Nov 10, 2017 7:26 pm

I have a 1956 420 crawler. The parts info I found indicates it should have Marvel Schreiber carburetor model TSX641. The unit installed on my crawler is a TSX245 which I believe was used on the earlier MC machines. Is there a a difference? Does the TSX245 cause performance or other issues when used on the 420C? I was planning to do a rebuild and discovered the discrepency

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Stan Disbrow
350 crawler
350 crawler
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Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Re: 420C Carburetor

Post by Stan Disbrow » Sat Nov 11, 2017 5:12 am

Hi,

The M carb is smaller than the 420 carb because the engine is smaller in the M. It will work up to almost full power at which point it will be a bit restrictive. Just how much, I am unsure of but the difference is 18 HP for the M and 32 HP for the 420. Given the other differences, I would hazard a guess that the 420 would drop to 26 or so HP with the M carb. This, of course, presuming the 420 engine is not worn. ;)

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

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

420C-Mike
40C crawler
40C crawler
Posts: 17
Joined: Mon Apr 27, 2015 5:59 pm
Location: Milwaukee

Re: 420C Carburetor

Post by 420C-Mike » Sun Nov 12, 2017 8:02 am

Thanks Stan
It is amazing the versatility of these machines and the 'substitutions" I find in my "project to rebuilt this 420C machine. Let's see: MC Carburetor, 40C crawler links- will see what I find next!

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Stan Disbrow
350 crawler
350 crawler
Posts: 2560
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Re: 420C Carburetor

Post by Stan Disbrow » Sun Nov 12, 2017 10:45 am

Hi,

Well, they are what I like to say is 'the same thing only different'. ;)

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

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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Lavoy
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Re: 420C Carburetor

Post by Lavoy » Mon Nov 13, 2017 2:19 pm

M carb will really whack the power, I would get a 420 carb, rebuild it, and then you will be better shape.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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Stan Disbrow
350 crawler
350 crawler
Posts: 2560
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Re: 420C Carburetor

Post by Stan Disbrow » Mon Nov 13, 2017 2:47 pm

Hi,

I have it! Run the M carb on the 420 only on the Superspeedways! Yup. The exact same as a Restrictor Plate..... :P

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

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

420C-Mike
40C crawler
40C crawler
Posts: 17
Joined: Mon Apr 27, 2015 5:59 pm
Location: Milwaukee

Re: 420C Carburetor

Post by 420C-Mike » Mon Nov 13, 2017 3:57 pm

probably will eventually get a 420 carb (lots of other items to repair first).. TSX245 used on 40C as well as M so it is closer to my early 420 which seems to be a modified 40C :D

fundytides
440 crawler
440 crawler
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Location: Saint John, NB, Canada

Re: 420C Carburetor

Post by fundytides » Mon Nov 13, 2017 4:46 pm

According to a chart that I have, TSX245 was used on the 320 and the 420 calls for a TSX641. Since the 420 has a larger displacement and more power any of the earlier carbs would probably limit it's power.
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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