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Post by k9hdlr on Nov 19, 2016 18:28:09 GMT -5
I bought and rebuilt a 636S for my Willys and it's getting fuel to the bowl as I can prime it 2-3 time and she will start, burn that fuel and then die...
I'm at a loss. I've checked and rechecked my measurements, and just can't figure out why she isn't getting fuel to run....
Any help greatly appreciated!
Andy (losing hair quickly... lol)
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Post by Scoutpilot on Nov 19, 2016 20:32:05 GMT -5
Hey Andy. Let’s start with these questions.
Did you completely rebuild the carb with a complete kit?
Completely stripped down. Cleaned out. Blown dry?
Are the mounting nuts tight (30-35 lb ft of torque) and the copper grommets flat?
What do you mean by “prime it”?
What is your COLD starting procedure?
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Post by k9hdlr on Nov 19, 2016 22:27:07 GMT -5
By primed I mean that I pumped the accelerator several times before cranking it over. I did a complete rebuild kit with all new parts from Ron Fitzpatrick Jeep Parts. I used the rebuild guide that is online and followed it step by step (it was very detailed). I cleaned out the entire carb and used my compressor to blow dry before reassembly.
So here's the update since my initial post.... I read several of your members posts about requiring the choke to be engaged in order for it to start (not something I had to do with the Solex I had on it). Sure enough, with the choke fully engaged it started up, but runs like crap... I can only get it to continue to run by keeping the RPM's up to what I'm guessing is about 1200-1500. I did manage to get it to idle (roughly) at one point, but it didn't last long before it died. Pretty much seams like I have to keep the choke engaged to run at a somewhat idle. And the idle adjustment screw is adjusted with only about a quarter inch of threads remaining.
Even still, I'd have to rev it up every now and then to keep it running, and while doing so it would sometimes cough and choke, and backfire through the carb. Like I said, running like crap.
Let me know what you think... and Thanks again!!!
Andy
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Post by Scoutpilot on Nov 20, 2016 5:39:18 GMT -5
It may simply have been flooded. Wet plugs don’t fire efficiently. If it will run only with choke that tells me that you’ve got either not enough fuel flow or too much air with the likelihood that it is the latter condition. Make sure the mounting nuts are tight and the gasket grommets flat. If you can get it idling again, do the vacuum leak test with either unlit propane or spray starting fluid. Do you think you can get a vacuum reading at the best stabilized idle it will maintain? Also, do you think you can post a video of it running?
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Post by k9hdlr on Nov 20, 2016 19:07:20 GMT -5
I'll see what I can do about taking and posting a video of it "running" I can also spray little carb cleaner around the base to see if I'm getting a vacuum leak. I pretty much had to play with the throttle to keep it running, and it was popping and giving a few backfires through the carb along the way. Thing ran smooth with the Solex, but I was just trying to put original equipment back on it. Heck, I cant even drive it in this current shape...
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Post by Scoutpilot on Nov 20, 2016 20:13:25 GMT -5
Fuel pump - mechanical or electric? Fuel pressure regulator in line?
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Post by k9hdlr on Nov 22, 2016 14:47:05 GMT -5
Fuel pump - mechanical or electric? Fuel pressure regulator in line? I've got a new glass bowl style mechanical fuel pump. No pressure regulator. System worked great with the Solex. An after thought. I had two small thin copper washers left over after the rebuild. Not sure where they would go, and the instructions make no mention. Ones about 2-3cm diameter and 1mm think. And there's another about 1-2cm diameter. I can take pictures tonight if necessary |
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Post by k9hdlr on Nov 22, 2016 14:52:59 GMT -5
Fuel pump - mechanical or electric? Fuel pressure regulator in line? I've got a new glass bowl style mechanical fuel pump. No pressure regulator. System worked great with the Solex. An after thought. I had two small thin copper washers left over after the rebuild. Not sure where they would go, and the instructions make no mention. Ones about 2-3cm diameter and 1mm think. And there's another about 1-2cm diameter. I can take pictures tonight if necessary One other thought... the brass fitting that holds the pin and spring which rests on the float... the brass fitting that came with the kit has a longer neck than the one that came out. The fitting has a piece that extends about 2-3 cm past the threads. I put the old one back in thinking it was the culprit but I don't think so and will put the new one back in. |
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Post by Scoutpilot on Nov 22, 2016 20:20:29 GMT -5
Fuel pump - mechanical or electric? Fuel pressure regulator in line? I've got a new glass bowl style mechanical fuel pump. No pressure regulator. System worked great with the Solex. An after thought. I had two small thin copper washers left over after the rebuild. Not sure where they would go, and the instructions make no mention. Ones about 2-3cm diameter and 1mm think. And there's another about 1-2cm diameter. I can take pictures tonight if necessary |
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Post by Scoutpilot on Nov 22, 2016 20:22:16 GMT -5
I've got a new glass bowl style mechanical fuel pump. No pressure regulator. System worked great with the Solex. An after thought. I had two small thin copper washers left over after the rebuild. Not sure where they would go, and the instructions make no mention. Ones about 2-3cm diameter and 1mm think. And there's another about 1-2cm diameter. I can take pictures tonight if necessary One other thought... the brass fitting that holds the pin and spring which rests on the float... the brass fitting that came with the kit has a longer neck than the one that came out. The fitting has a piece that extends about 2-3 cm past the threads. I put the old one back in thinking it was the culprit but I don't think so and will put the new one back in. |
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Post by k9hdlr on Nov 22, 2016 23:09:31 GMT -5
One other thought... the brass fitting that holds the pin and spring which rests on the float... the brass fitting that came with the kit has a longer neck than the one that came out. The fitting has a piece that extends about 2-3 cm past the threads. I put the old one back in thinking it was the culprit but I don't think so and will put the new one back in. I took video of the Carter WO running and a second video of the Solex running just after I switched them out. You can see how poorly the Carter is running. Without full choke she just dies and will only run at high RPM. I use run loosely... you can hear had bad it was running.... Carter WO Solex |
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Post by k9hdlr on Nov 22, 2016 23:29:08 GMT -5
 So I found those nozzles you referred to and the copper washers fit perfectly. Okay, so I only see the one nozzle referred to on page 4 item 49. Where does the second nozzle go??? |
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Post by Scoutpilot on Nov 23, 2016 5:01:12 GMT -5
Last question answered first. The nozzle with the notched head is for the 539S. The nozzle with the round head and notched step is for the rest of the WO series. The kit covers both, but only one is installed.
I have, in the past, come across some carbs that presented as yours does. The problem with them was either an internal crack allowing a vacuum leak between circuits, or a crack in the throttle base. I’m not yet convinced, however, that your problem isn’t external in nature. I surely would like to know the measurements of the throttle shaft and bores. .005” difference OD/ID is enough to be a leak. Should you decide to take those measurements be aware that the tips, and not the heads, of the throttle plate screws will likely need to be sheared to remove the peened ends. Otherwise, you will twist the head off of the screw.
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Post by k9hdlr on Nov 23, 2016 10:20:00 GMT -5
I'll see what I can do about getting those measurements for you. Won't be until I return from thanksgiving weekend though.
Thanks for the info on the nozzle. I suspected something like that. Being that I've installed the kit, would you be willing to tune this thing up for me if I would mail it to you? Of course I'd pay you for your time. 😁
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Post by Scoutpilot on Nov 23, 2016 13:36:54 GMT -5
I would be happy to do that for you. Whenever you wish.
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