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willysmjeeps.com :: View topic - YS 637s rebuild kits
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YS 637s rebuild kits

 
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davem201m38
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Joined: Jan 22, 2006
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Location: UK

PostPosted: Tue Jul 14, 2020 4:32 am    Post subject: YS 637s rebuild kits Reply with quote

Hi all,
I've been on the usual dealer web sites and I'm struggling to find an Ethanol proof rebuild kit for the M38 YS carb from a Military dealer, I just don't see one in the lists.
I have found one from a Carb parts dealer but I'd prefer to fgo with somebody known.

I'm in the UK so it will need to come from the US.

Ta, Dave.
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David Wigham
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G740
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Posts: 470

PostPosted: Tue Jul 14, 2020 5:06 am    Post subject: Reply with quote

Midwest Military has a good kit. Nothing is "proof", but resistant is the operative word. The kit is made from current material used with today's fuels.
John
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davem201m38
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PostPosted: Tue Jul 14, 2020 7:42 am    Post subject: Reply with quote

I couldnít find it on The site, where? I didnít see it under fuel.
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David Wigham
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davem201m38
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PostPosted: Wed Jul 15, 2020 4:32 am    Post subject: Reply with quote

Ah, found it, no picture, I see.
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David Wigham
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G740
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PostPosted: Wed Jul 15, 2020 5:38 am    Post subject: Reply with quote

Full overhaul kit. Everything needed to rebuild your housings.
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davem201m38
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PostPosted: Wed Jul 15, 2020 6:04 am    Post subject: Reply with quote

OK folks. I have 2 x 637s to rebuild. And have ordered the kits up from a Midwest.
Apart from the hic up of the spring being shown in the wrong position On Fig 60 of chapter 9 of the manual is there anything else I need to be aware of? Wes?...
Thank you,
Dave.
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David Wigham
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wesk
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PostPosted: Wed Jul 15, 2020 11:33 am    Post subject: Reply with quote

Mainly use the full panel of technical manuals available to you.

Disassembly should always be done on a clean work bench with good tracking (photographs etc) of the process and good inventory of parts. Tiny check balls have a tendency to vanish!
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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davem201m38
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PostPosted: Wed Jul 15, 2020 1:23 pm    Post subject: Reply with quote

Yes thanks Wes, Iíve got the manual and I remember from years ago your warning about that spring, I bought Midwest kits assuming quality, if they turn out to be the same as the kits I can get over here Iíll kick myself.
Cheers, Dave.
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David Wigham
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wesk
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PostPosted: Wed Jul 15, 2020 1:57 pm    Post subject: Reply with quote

Remember I said:

Quote:
Mainly use the full panel of technical manuals available to you.


For the M38 that would be TM 9-1826A, TM 9-8012, TM 9-804, TM 9-1804A, ORD 9 SNL G-740 and Carter YS637S Spec sheet.

John at Midwest and AJP sell the same kit as I recall. It is a covers both kit since it has the items for both the YS637S and the YS950S. Be carefull which parts you use. Also the thick manifold insulating gasket with built in diverter is not in that kit.

Be sure to take advantage of my M38 fuel system photo album:
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album83&op=modload&name=gallery&file=index&include=view_album.php


Midwest & AJP Kit.


Ron Fitzpatrick's kit.


This is the correct carb to manifold gasket for the M38.


Carter spec sheet pg 1


Carter spec sheet pg 2
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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davem201m38
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PostPosted: Wed Jul 15, 2020 2:06 pm    Post subject: Reply with quote

Thank you Wes. John doesnít actually show a picture on his website so I missed it at first. Weíll see how this goes.
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David Wigham
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wesk
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PostPosted: Wed Jul 15, 2020 3:12 pm    Post subject: Reply with quote

The photo I posted was of one of his kits I used in 2006.


This is AJP's ad for their kit which is the exact same kit used by Midwest.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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davem201m38
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PostPosted: Sat Jul 18, 2020 1:43 pm    Post subject: Reply with quote

OK, used Seal Tested kits from Midwest Miltary, seem good kits with everything you could need plus more, arrived in 2 days to the UK, excellent.
But 2 things, now I've rebuilt the first carb.

Nice thing is the springs are bagged with the diaphrams so there's less chance of getting them mixed up.

1. Does anybody know why the kit that seems 637s specific has 2 metering rods? Nothing to say that they are different in the packaging and the numbers on them are too faint to read.

2. The kit comes with a Bleed Tupe Inner as well as the Bleed Tube assembly.
No way could I figure out how to get the inner bleed tube out of the carb body so I left it. Removing it isn't metioned in the TM. So how does one extract the Bleed Tube?

Ta, Dave.
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David Wigham
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4x4M38
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PostPosted: Sat Jul 18, 2020 8:29 pm    Post subject: Reply with quote

Then and Now also sells rebuild kits, fyi.
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Brian
1950 M38
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http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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davem201m38
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PostPosted: Tue Jul 21, 2020 2:10 am    Post subject: Reply with quote

Hi Wes,
OK I've now rebuilt one of the carbs, pretty easy just follow the manual, mine was missing pages some so read the dismantling instrucions in reverse.

How ever there is a problem with Seal Tested kits, the kit seems excellent with the parts in it, more than you will need BUT....

In one kit, the first I opened there are 2 metering rods, though the pack says it's for 637s (the kit mentions no other carb) it also does the 950. The metering rods are very poorly etched / marked and the numbers are unreadable and both metering rods look identicle. The vendor told me that the 637s metering rod has slightly rounded corners. These are darn hard to see with the naked eye.

Looking in the second rebuild kit, one of the metering rods is unreadable, and luckily one can be read, 75-826S does seem to have slightly square shoulders so the unreadable metering rod is the one to use for the M38 carb.

I imaging if out of 2 complete kits there are 3 metering rods that have unreadable numbers other folks might have the same problems occasionally,
Cheers, Dave.
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David Wigham
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wesk
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PostPosted: Tue Jul 21, 2020 9:57 pm    Post subject: Reply with quote

The AJP & Midwest Mil kits are for both the 637S & the 950S so they use different metering rods. As I said earlier, take advantage of my M38 and M38A1 fuel system sub albums they have illustrations of the two metering rods with measurements.

The inner bleed tube is not threaded and it is not a press fit. It is a light interference fit and is easily removed by gripping gently wit a pliers and twist back and forth as you pull it out. You insert it by hand and the threaded outer tub retains it.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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