Dwells0803 Posted June 22, 2020 Share Posted June 22, 2020 Hey all, I've been working on my 1928 Plymouth Model Q and it has this Tillotson JR-1 carb on it. I know it isn't the original, but was planning on keeping it, unless I can't get it to run right with it. I've been able to get it running, but have to feather the pedal to keep it running. Anyhow.. I took the carb off, to tear it down and clean it. When I got the car I was told it was just rebuilt. Well, that isn't quite accurate. I got into it and it was way dirty. So, been cleaning it and disassembling it and found the Accelerator Pump is in ROUGH shape. See attached Pics. Anyone know where I can source a new one or what I could effectively replace the "sealing surface" with? All the rebuild kits I find for these carbs don't have anything to replace or fix the Accelerator Pump. Any help would be appreciated.. Link to comment Share on other sites More sharing options...
TerryB Posted June 22, 2020 Share Posted June 22, 2020 (edited) Look up carbking on this forum, he might have what you need. Edited June 22, 2020 by TerryB (see edit history) Link to comment Share on other sites More sharing options...
carbking Posted June 22, 2020 Share Posted June 22, 2020 You are seeing the entire pump, the "sealing surface" is the largest diameter brass cylinder. THERE IS NO LEATHER SKIRT! The damaged piece on the bottom is simply a brass washer holding the pump together. (1) remove the washer (2) glass bead the pump (3) fabricate a new brass washer (4) peen the end of the shaft over the new washer These units were sold through such sites as Whitney, Warshawsky, and Western Auto to customers too frugal to purchase a gasket set for the original carburetor. According to the Tillotson books, even Tillotson did not offer a rebuilding kit. Tillotson did offer individual parts, but they had to be special ordered. The pump is Tillotson 0-3900. As far as the kits containing pumps, we started hand-cutting kits some 30 years ago. To date, you are the first requesting a pump. The cost of fabricating a new pump would exceed the value of the carburetor. These carbs do have one redeeming feature: the top casting is cast iron. So one can place the top casting in a machine, and cut the flange from the rest of the casting just above the throttle shaft. One can then weld two of these together to fabricate a carburetor adapter. Jon. 1 Link to comment Share on other sites More sharing options...
Dwells0803 Posted June 22, 2020 Author Share Posted June 22, 2020 Carbking, Thank you for your help, so cut off the old washer on the bottom and then install a new one and peen the shaft over? Great. Thank you for your help. So do I keep this carb or go with a new carb? If a new carb, which would You suggest going for the 1928 Plymouth? Thanks, Derek Link to comment Share on other sites More sharing options...
Kenneth1930 Posted August 11, 2020 Share Posted August 11, 2020 Hello Dwells, I just rebuilt two Tillotson JR5 carburetors and they use the same accelerator pump as you show in your photos. I was starting to wonder who would need such a carburetor? and just imagine my surprise when your link showed up. anyway, if you are interested please send me a message. Kenny Model A Club President Whittier California. text 5 six 2 ate one 8 79 for nine thank you Link to comment Share on other sites More sharing options...
norm cushing Posted June 14 Share Posted June 14 (edited) Hi Kenneth1930 and everybody else in the community... Are either of those JR5 carbs still available to be obtained? I have a 1929 Chevrolet International AC 1-1/2 ton truck that uses the JR5A and it needs a Main Jet replacement or a replacement carb. Your assistance to connect with Kenneth1930, or another source for parts or carbs, would be very helpful, Respectfully, Norm Edited June 14 by norm cushing fat fingered the CR before typing the message. (see edit history) Link to comment Share on other sites More sharing options...
Tonz Posted August 8 Share Posted August 8 Probably too late for a reply, but I'm running a JR4, I have another as a spare, the are both in good order. On both mine the accelerator plunger has a thin steel washer retained by the peened over shaft end. This washer floats about 30thou against the lower face of the plunger where it covers a circle of small holes, essentially it's a one-way valve. Both mine were gummed solid, but a bit of carb clean and a few hits in the ultrasonic bath freed them up nicely. Link to comment Share on other sites More sharing options...
Mark Gregush Posted August 9 Share Posted August 9 On 6/13/2024 at 5:26 PM, norm cushing said: Hi Kenneth1930 and everybody else in the community... Are either of those JR5 carbs still available to be obtained? I have a 1929 Chevrolet International AC 1-1/2 ton truck that uses the JR5A and it needs a Main Jet replacement or a replacement carb. Your assistance to connect with Kenneth1930, or another source for parts or carbs, would be very helpful, Respectfully, Norm Try sending him a PM or look and see if he has an email attached to his profile. He was last here back in 22. Link to comment Share on other sites More sharing options...
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