VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1929-1932 Carter C-RJH-08 Carburetor how to ID

OK, on my quest for a Carburetor for 1930 Chevrolet AD Universal - Canopy Express Truck I know that it calls for a Carter C-RJH-08 150S Part Number 836300. In looking around at the Carbs how can you ID which Model/ Version it is between the 125S, 136S, and 150S ??

Are they all the same casting ??

How can you identify and distinguish between them ??

Thanks for all the input...

The 125S is easy to identify. It has the short (~2") fat (1" dia.) accelerator pump. The 136S and 150S are harder to tell apart. The 136S originally had a brass cap on the top of the accelerator pump and a pump arm with two holes. The early 150s also had the brass pump top. There are also several internal part differences between the late '29 and '30-'31 carburetors. The vast majority of those carburetors have had 150s parts installed so it means taking them apart to tell the difference.

Also, the choke cone and the venturi in the 150-S are both a different size than the choke cone and the venturi in the 136-S. However, you would have to take the parts out of the two carburetors to tell the difference.

So a Visual Difference is easily seen between the 125s & 136S/ 150S, mainly the Accelerator Pump Size & Location. But to tell the difference between a 136S & 150S comes down to internals.

I have seen several that did NOT have the Acc Pump... Are these rebuildable or stay away ?? And how could you tell if it is a 125S, 136S, or 150S ?? And cost for these parts to COMPLETE the carb ?? Also cost to change from a 136S to a 150S ??

I am looking for a RJH-08 150S for my 1930 Chevrolet Huckster. Do not need one right now, but always looking, just in case I find a great steal of a deal.

From my findings the average price of a complete RJH-08 150S is about $450. So what would a good price for a core carb for rebuild be worth, and then the cost to rebuild it PROPERLY to the 150S Configuration ??

What should I be looking for in a Rebuildable Carb ??\

-Figure a good solid Body/ Casting.
-Solid Non-Cracked/ Fractured Acc Pump Body.
-Solid Brass Bowl w/ no holes or fractures.

What else ??

Just weight my options !!

The Carter RJH-08 or C-RJH-08 all had an accelerator pump. Quite often you see ones with the pump broken off being sold. Since the 125S pump used 18 tpi (1/4" NPT) and the 136S and 150S have 27 tpi you have to be careful when buying a core. The 125S pumps can go for several hundred $$$$ as useable ones are getting scarce.

As long as the cast iron body is in good shape (not broken or corroded) they can be rebuilt. If you had to replace all the parts the rebuild cost could be over $ 1K depending on the rebuilder. Several of the parts cost $ 50 - $ 100 each. If you look in the Filling Station catalog you can add up many of the readily available parts. That might give you an idea of the cost to rebuild or convert one. Of course it depends on what the rebuilder charges for labor and parts. I have seen charges to rebuild one well over $ 500 (and I had to do redo the rebuild so it was right). I have rebuilt some where the total was under $ 200

Thanks Chipper...

You stated the 125S has 1/4" NPT at 18 TPI, and that they 136S & 150S have 27 TPI, are these also 1/4" NPT or ??

No they are 27 tpi and not 18 tpi. NPT is 1/4-18 with taper. The 136S & 150S use a tapered 1/4 dia. thread but it is 27 tpi not 18.

Wow... Got any Tylenol ?? Got a headache now

Ok so for the 136S & 150S they use a .250" Dia Thread with a Taper containing 27 Threads per Inch.

Yet this is NOT a NPT Thread or Standard Bolt Thread. I could not find any details on this thread, was this a Special Thread. How do you trace/ clean them up on a gunked up carb, or where the Pump Broke off and have to clean them up to ensure a good Seal >?<

and for hte other side, assuming this is the fuel line connection, what thread should that be ?? looks like .125" with 27 Threads per inch. Is this a Standard NPT Connection or a special Connection.

Where can you find/ get fittings for these connections ??

Sorry Guys, just trying to learn and educate myself, and figure out what I have on hand, need to replace, etc...

I will have to clean up what I have now, and post pictures.

Wow... Got any Tylenol ?? Got a headache now crazy

Not a druggist so don't know much about headache remedy.

Ok so for the 136S & 150S they use a .250" Dia Thread with a Taper containing 27 Threads per Inch.

As they told Liza "now you got it."

Yet this is NOT a NPT Thread or Standard Bolt Thread. I could not find any details on this thread, was this a Special Thread. How do you trace/ clean them up on a gunked up carb, or where the Pump Broke off and have to clean them up to ensure a good Seal >?<

The thread was indeed "special". You can use dental tools, drill bits, easy-out, or just send the carburetor to someone that has the tools and knowledge to rebuild it. Or you can do what I did have a "special" tap made at an outrageous price.

and for hte other side, assuming this is the fuel line connection, what thread should that be ?? looks like .125" with 27 Threads per inch. Is this a Standard NPT Connection or a special Connection.

On the other side you are lucky as it is standard 1/8" NPT.

Where can you find/ get fittings for these connections ??

Your local hardware store will either have them or be able to order them. Most have a minimum order amount which will exceed your need. Took me several years to work out the costs, logistics, accumulate the tools, specifications and techniques so I could properly rebuild these carburetors. Good luck rebuilding it yourself. If you mess it up trying to "fix" it send it to someone else. It takes way more time to take one apart where the screw slots are stripped out. Or some backyarder tried to drill out a part they messed up. Right Skipper?

Sorry Guys, just trying to learn and educate myself, and figure out what I have on hand, need to replace, etc...

I will have to clean up what I have now, and post pictures.

Thanks Chipper...

I have NO intentions of doing the work myself, or even attempting to do it. Just trying to learn as much as I can about my 1930. And the current lesson is Carburetors :-)

When I am ready to get to the drivetrain, I will be sending my Carburetor out to someone with vast knowledge and experience in what they are doing (Wonder Who that lucky Sole will be... Hint Hint) to take care of it.

I am currently working on the frame, cleaning, prepping, etc...

Right Chippy Dippy!

OK Guys... Actually got time and ran out and pulled what I had out of the box and shot some pictures.

This is what I have on hand at home right now in way of a Carburetor: Huckster: Carburetor

I know that it is a Carter RJH08 Produced by Chevrolet, as the Casting Number on the side. I also know that it is missing the Accelerator Pump. The Float and Bowl look in great shape no leaks, cracks or such. All parts move freely and easily.

My thought was to buy a RJH08-150S complete and then have it rebuilt, as I figured it would be cheaper then rebuilding this one, considering the parts i would have to buy. Or I could buy a rebuilt one from one of the Qualified - Experienced Builders on here and then offer trade/ core for this one or worst case try and sell it ??

It is not a necessity right now, as I am STILL working on the frame. Stripping, Priming, Painting. Then on to Brakes & Suspension. Trying to get a Rolling Chassis, then on to Drive Train :) Engine, Tranny, Rearend... Make me one of those cool 1930 Frame Go-Karts ( lol ) Milk Crate Seat and ALL !!

Any Thoughts ?? JYD or Chipper !!

The carburetor pictured might be a candidate for rebuilding. The corrosion on the bottom of the well (where the bowl screw goes in) might prevent a proper seal. There are also several parts that would need to be replaced or added (like accelerator pump cylinder & plunger). Can't tell from the photos if the standpipe and venturi are okay. That could add to over $ 200 in needed parts. Good cores are currently selling for $ 50 - $ 100 on ebay. Therefore it probably is better to get another core. Be sure that the standpipe, accelerator pump parts are in good condition as they are the more expensive ones to replace.

Keep in mind that to purchase a quality rebuilt carburetor outright could run $450 to $500, so it's probably a toss-up as to getting yours rebuilt or to purchase a quality rebuilt carburetor.

The pics on the carb look like its been rebuilt already.

Im in richmond if you need to use my canopy express to compare parts and measurments.
send me a private message.
jmm

Thanks Guys... From looking at it the Venturi & StandPipe look great, no cracks, fractures, etc... Granted looks can be deceiving.

And since I am in no hurry, i have been keeping an eye out on the carbs. Still uncertain what road i am taking on carb to rebuild or buy one already done. Just want to make sure that at the end of the day I have a fully functioning Carter RJH08-150S that is aestetically pleasing. I am not trying to build a SHOW truck, just a Driver Restoration that I can appreciate and show off.

Well that is the plan for NOW ( lol )