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Carb rebuild questions.


 
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kossuth
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Joined: 24 Dec 2007
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PostPosted: Sun Dec 01, 2019 11:24 am    Post subject: Carb rebuild questions. Reply to specific post Reply with quote

In summary I got fuel to the old girl last night after getting the wiring sufficiently done to allow me to get spark to it and rigging a fuel tank ontop the steering wheel in hopes of hearing her run again. Well, wasn t gonna happen right then and there. If I had to guess I d say she s leaking fuel from just about everywhere. Heat probably burned part of the gasket out.

When I got the carb off it I found a couple of surprises. The shaft openings have been bushed previously. Based on what I have read these carbs originally did not have bushings for the throttle and choke shafts. She s got some slop in the shafts so I want to fix that. Is there a kit out there to put bushings in these or am I mostly on my own on this?

There is also there are two small holes in the float bowl assembly (one with a brass fitting kinda like a jet) that I presume is connected to the main jet circuit. What size of drill/wire should I be able to run down these two passages?

Thanks.
 
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kossuth
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PostPosted: Sun Dec 01, 2019 11:30 am    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

The passages are as shown in this image.
 
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soaked
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PostPosted: Sun Dec 01, 2019 12:29 pm    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

I have a 241-b on my shelf:
Have a wypo welding tip wire set.
The small hole with brass fitting will
fit the #14 wire and wire ridge. The
ridge is .034

The larger hole will fit the #22 wire
and ridge. Ridge is .051.

I havent done the shaft bushing
replacement, but see the parts in the
full rebuild kits.
John
 
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Royse
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Location: Ionia County Michigan

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PostPosted: Sun Dec 01, 2019 2:53 pm    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

Putting bushings in for the shafts was a common repair when the
housings wore out. If they're not too badly worn, leave them and
install a new seal.

As for the little holes, run a wire or banjo/guitar string through them.
Don't drill them.
One does not go straight through and the other steps down in sizing as it goes through.

Picture compliments of forum member JMOR.


 
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Btzj02
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Joined: 17 Nov 2019
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PostPosted: Sun Dec 01, 2019 3:22 pm    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

Royse wrote:
(quoted from post at 15:53:11 12/01/19) Putting bushings in for the shafts was a common repair when the
housings wore out. If they're not too badly worn, leave them and
install a new seal.

As for the little holes, run a wire or banjo/guitar string through them.
Don't drill them.
One does not go straight through and the other steps down in sizing as it goes through.

Picture compliments of forum member JMOR.



I was able to spray carb cleaner down the holes using the little red tub that comes with W D40. Using a small pointed nozzle I blew air through until dry. Seems to have done thr trick.
 
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IowaSam
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PostPosted: Sun Dec 01, 2019 4:19 pm    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

I have rebuilt many Marvel carbs, never one that had a bushing there.
JMHO, they are a finicky bugger to any kind of air leak/imbalance, but are great when running right.
I can not overly stress how important it is to have the right viscosity oil in the air cleaner for each "kind" of tractor. Fallow your owners manual ! !
More than half the time it is the filter that starts the problems, then dirty fuel, & not shutting the fuel off when parked.
 
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Tim PloughNman Daley
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PostPosted: Mon Dec 02, 2019 4:42 am    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

First, never guess or presume; apply a true root cause problem solving method for every problem. What gasket do you think burned? On the carb between the two halves? If you are leaking fuel "just about everywhere" why would you start the engine? Get the fuel leak first -sediment bulb assembly valve stem is the usual culprit - a $6 part and no need to buy a whole new bulb assembly. #2 cause is an incorrect fuel line. NEVER use plastic, rubber, nylon copper, or aluminum for a fuel line. Also, stripped out/boogered up threads - the OEM fittings are special 7/16-24 so if crossthreaded or chased with the wrong tap, female bulb and/or brass elbow on carb part is fubar. Next, it doesn't sound like you have an OEM Marvel-Schebler TSX carb but some aftermarket unit. The float has no small holes on it. There are no bushings on the TSX carb. DO NOT DRILL or REAM pout the passages. Use a wire or what I use old guitar strings. I soak for weeks in carb cleaner then sandblast the entire unit inside and out then run the strings thru all passages, then soak in mineral spirits (charcoal lighter fluid is the same thing) for a week before a good compressed air blow out. Inspect the passages before reassembly. If you wish, I have a few OEM Marvel-Schebler carbs already rebuilt fully and ready to mount. BTW -what tractor model do you have? My email is open.


OEM MARVEL-SCHEBLER TSX-241B CARB, RESTORED/REBUILT FOR SALE:






Tim *PloughNman* Daley(MI
 
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Hobo,NC
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Joined: 14 Jun 2007
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Location: Sanford,NC

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PostPosted: Mon Dec 02, 2019 5:04 am    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote


There are 2 sizes of throttle shaft bushings
large O.D. #T818, O.D. (.384)
Small O.D. T819, O.D (0.320)

I use the small on when possible..

Spray passing thru the ports is not a confirmed go no go test poke wires thru them are you may get to take it apart again...
 
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kossuth
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PostPosted: Mon Dec 02, 2019 8:11 am    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

CVPost-Tim PloughNman Dal wrote:
(quoted from post at 05:42:26 12/02/19) First, never guess or presume; apply a true root cause problem solving method for every problem. What gasket do you think burned? On the carb between the two halves? If you are leaking fuel "just about everywhere" why would you start the engine? Get the fuel leak first -sediment bulb assembly valve stem is the usual culprit - a $6 part and no need to buy a whole new bulb assembly. #2 cause is an incorrect fuel line. NEVER use plastic, rubber, nylon copper, or aluminum for a fuel line. Also, stripped out/boogered up threads - the OEM fittings are special 7/16-24 so if crossthreaded or chased with the wrong tap, female bulb and/or brass elbow on carb part is fubar. Next, it doesn't sound like you have an OEM Marvel-Schebler TSX carb but some aftermarket unit. The float has no small holes on it. There are no bushings on the TSX carb. DO NOT DRILL or REAM pout the passages. Use a wire or what I use old guitar strings. I soak for weeks in carb cleaner then sandblast the entire unit inside and out then run the strings thru all passages, then soak in mineral spirits (charcoal lighter fluid is the same thing) for a week before a good compressed air blow out. Inspect the passages before reassembly. If you wish, I have a few OEM Marvel-Schebler carbs already rebuilt fully and ready to mount. BTW -what tractor model do you have? My email is open.


OEM MARVEL-SCHEBLER TSX-241B CARB, RESTORED/REBUILT FOR SALE:
<center><img src="https://i.imgur.com/DU4UJCMh.jpg"></center>


<center><img src="https://i.imgur.com/64kpek3h.jpg"></center>


Tim *PloughNman* Daley(MI
Gasket between the upper and lower half was compromised. When I got it apart I also noted that the venturi (plastic so it has been replaced at one time or another) was warped from what I assume was heat given that was the side the tires burned on etc.
 
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soaked
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PostPosted: Mon Dec 02, 2019 11:39 am    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

Been thinking about your " burned" carb.
Have you removed the needle/ seat
successfully? And the 3 brass jets?
Will try to add picture of wypo tip
cleaner set. Easy to search/ find/ look
up wire size chart.

May want to leave the brass jets alone,
to avoid damage. (Drill and tap no fun)

John

 
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Tall T
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Joined: 26 May 2014
Posts: 3460
Location: Salt Spring Island

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PostPosted: Mon Dec 02, 2019 1:00 pm    Post subject: Re: Carb rebuild questions. Reply to specific post Reply with quote

BEWARE of running fine flexible wire down the hole that doesn't go straight through as your wire can get hung up down in there as it can take a sharp turn.

I know, I got a very fine wire stuck and tried and tried to wiggle it back out. In desperation and with fingers crossed I gripped it with vise grips and gave it a little yank and out it came.

I was very worried for a spell that I had broken the very end of the wire where it was stuck in the turn.

The YT kit has been fine and the Jube running perfectlysince then, which was Sept 2016.

I like the welding tip cleaner idea -- surprised I hadn't thought of those.

T
 
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