yf 938 carb - s sa sb sc sd, which is it

read 3b page, but how do you know which carb
you actually have installed - is it stamped or a tag ?

CARTER YF IDENTIFICATION

Specific YF numberical identification is stamped sideways upon a thin reinforcing web at side of the fuel well body.

Upon external obsevation of the Carter model YF you will note that it can be roughly divided into 3 sections.
1) The bottom cast iron (generally) section is termed the throttle body or the body flange.
This consists of the throttle bore and the throttle vavle.
This section mainly controls the air velocity and manifold vacuum.
2) The middle section is termed the fuel well body and mainly controls the fuel metering.
3) The upper section of the YF is termed the air horn assembly which mainly provides the air intake and fuel inlet.
It also provides choke function.

thanks oldtime - a little varsol scrub and i see 938 SD stamp

a ) should a '57 have originally had the SD - i think it was the last revision model ?
b ) would a old carter SD rebuild kit most likely be correct/best bet for rebuild ?




edit : this one

Randy,
is that your OEM Carter Kit ?
That's an exceptionally nice kit.
You really ought to document all the parts in the kit.

In fact I'll buy it off you and send you a Jeep NOS kit if you don't need all the parts from the OEM Carter kit.

Besides minor metering changes the SC and SD use a pump discharge check needle
as opposed to the S and SA check ball and weight.

the kit is avail from the turkey nos carb vendor as a buy now,
he's got alot of them - picking one up.

figure i will need it - the PO set my idle high (1000rpm on analyzer)
and i am not going to fiddle with it just yet , i ran some
really strong cleaner thru and smoothed out the idle for now

edit: oldtime if you want to see it first hand i can forward it too you
to have a look - will let you know once it arrives

Randy,
Thanks for the info.
I had not seen them.
I'll likely buy a kit for myself.

According to my limited collection of old Carter documents :
The 938 ..S begins 1953
The 938 SA begins 1954
The 938 SC begins xxxx
The 938 SD begins late 1959

looks like someone swapped the SD onto mine then

they ship fast from turkey - rec'd it already
its kit # 5145X and the instructions are © 1983

it lists willys 4cyl 1950 to 1967 and a few adj settings

is there something in particular i should be looking for ?

Randy,
I never found the Carter OEM YF kits on eBay.
You have a link ?

Perhaps the original carburetor was changed out.

try item # 110569237045

i will have a closer look at it tonight

i can lay them out a post a pic

and/or

measure anything of interest ...

curious how well it might work before
i open my carb up ...

Randy,

Did you ever try this zip kit? I bought one too and was wondering if yours worked out for you or not.

I have a spare 938 SD that I took apart yesterday with intentions of doing a full rebuild. The first thing the manual says to put back in is the throttle shaft seal and retainer. I didn't see either in the kit. Of course, there didn't appear to be either when I was taking the carb apart, either....

This rebuild might be a bit more complicated than I expected I will probably have to start a separate thread so I can start asking questions and get this rebuild done correctly.

Here are a few pics of the kit, in case you're still interested, Ken:

Carter skipped the "SB" model and went from "SA" to "SC" directly. I suppose they skipped "SB" for obvious reasons....

That's right .....Ha Ha Ha !

Those kits look really good !

The YF carb on my 64 CJ3B has the number 3200S stamped into the web. Is this carburetor correct to my jeep, or is it a transplant? Also would a rebuild kit for a YF 934 SD be compatable?

Carter YF 3200 S is listed for Kaiser fleetvan with F-134 Hurricane.
The repair kit should be identicle with the 938 models.

Is this YF 3200 S a vented carburretor ?
Is there a vent hose that runs from the top of the carburetor to tha oil bath air filter ?

See: http://z4.invisionfree.com/CJ3B_Bulletin_B...=0#entry2570864

No, there is no bowl vent. Perhaps the top was replaced with an older type.