Leaking Passage on 44 Weber

Dustin · Posted: Tue Jun 28, 2011 7:18 pm Post subject: Leaking Passage on 44 Weber

I have a 2017 with dual 44 Webers. There are 4 channels that surround the accelerator pump and have permanent metal plugs in them. The one that's just above and to the left of the vacuum advance port for some reason had a rubber plug in it. It popped out the other day and fuel started pissing all over the cylinder tin. Luckily I smelled gas and had a look before I burned it to the ground! Anyway, I looked into the hole, and I don't understand where it goes to, but I didn't see any branches off of it or anything ( as best I could see up there). I took a really short screw and some JB weld putty and plugged it back up. I put the carb back on and it fired up right away for about 10 seconds, and then suddenly died. I've killed the battery trying to get it started again, but it doesn't even sound like it's close. It seems like it might have just burned off what fuel was left in the carb and then became starved, but why? The screw was maybe 1/4 inch long, so it shouldn't have caused any problems. There's fuel coming out of the idle jets and the float bowl is full. Maybe coincidentally I had an unrelated problem that killed it. There are no diagrams I can find that show the internal passages of the Webers, so I need some clarity. Thanks in advance to anyone that can shed some light on this for me!

mharney · Samba Member Joined: June 01, 2002 Posts: 8351

Shoot a pic of the hole.. let me see where you put the screw.

Dustin · Posted: Wed Jun 29, 2011 12:11 pm Post subject:

Image may have been reduced in size. Click image to view fullscreen.

I don't know why I was thinking there were 4 channels with plugs. The bottom 2 have them, and the top 2 are just cast to be drilled out if needed I assume. Anyway, the one the pen is pointing at is the one that blew out.[/img]

RockCrusher · Posted: Wed Jun 29, 2011 4:02 pm Post subject:

Looks like you blocked the idle jet fuel feed....see the brass screw near the top of the carb straight up from your plug? That's the idle jet holder and the passage goes right down to your LONG plug.
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baked beetle · Posted: Wed Jun 29, 2011 4:10 pm Post subject:

I'm really close to you Dustin, 3 hrs away. I have a spare 44 idf if need be.
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mharney · Samba Member Joined: June 01, 2002 Posts: 8351

Pauly's got it. Something is obstructing, maybe shavings from threading, who knows.. screw too long would do it.. 1/4" seems not long enough to me to obstruct.

RockCrusher · Posted: Wed Jun 29, 2011 6:53 pm Post subject:

Seems exactly long enough....either way I believe that's the trouble.
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[email protected] Please use email for all general inquiries.

I will be happy to speak to anyone who has a serious inquiry (meaning real potential business for RC enterprises) or a parts order. Due to machining noise causing missed calls all calls will be returned promptly.
610-800-0569 (voice mail is Total Home Media.....soon to be changed)

Dustin · Posted: Wed Jun 29, 2011 7:58 pm Post subject:

Is there a reason for that hole to be there? I bought the carbs nearly new, but maybe the PO had a reason to plug it with a rubber stop as opposed to the metal ones in the other holes. I'll try to drill it out maybe and use some compressed air to try and unblock the passage. Let me know if that sounds like a bad idea.
Baked Beetle- Thanks for the offer- I'll let you know if I can't get this sorted out.

RockCrusher · Posted: Thu Jun 30, 2011 6:35 am Post subject:

Do not blow air in the passages if the carbs have brass floats or the float can easily collapse. Yours should have plastic floats but be certain.
_________________
[email protected] Please use email for all general inquiries.

I will be happy to speak to anyone who has a serious inquiry (meaning real potential business for RC enterprises) or a parts order. Due to machining noise causing missed calls all calls will be returned promptly.
610-800-0569 (voice mail is Total Home Media.....soon to be changed)

Dustin · Posted: Thu Jun 30, 2011 8:10 am Post subject:

Awesome! Thanks for all the help guys! I got the screw out and it looks like I put too much JB in and the screw pushed it in too far. I cleared it out and shot air through into the float bowl (thanks for the heads up RockCrusher!) and I can slide a drill bit cleanly into the float bowl. Hopefully it's not blocked at all going up to the idle jet, but I guess I'll find out soon enough. It looks like I can access the idle jet feed by drilling out from the top, but I'll see if it's necessary before I do that. What do you guys recommend to re-plug the hole? Is there a problem with coating the threads of a shorter screw with JB and just making sure there isn't so much that it squishes out deeper into the passage? Or is there a better idea. I'd assume the original plugs are pressed in, but what are my other options?

Dustin · Posted: Thu May 31, 2012 7:58 pm Post subject:

Well it happened again! This time the other plug blew out and fuel began pouring out over the hot manifold and exhaust. So far, the screw plug fix I did on the first hole seems to be holding, so that's what I've done again for this one. Can anyone shed some light on why these plugs would blow out? I am running an electric fuel pump with a pressure regulator, but even if the regulator failed, there shouldn't be enough pressure in the float bowls to blow them out. Or maybe there is? I'm kind of at a loss. I'm thinking it might be wise to pull the other carb and try to replace those plugs too just to save being stranded later on. I can't find any info about this happening to anyone else.

66brm · Posted: Thu May 31, 2012 8:04 pm Post subject:

Is the car backfiring through the carbs much?
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Dustin · Posted: Thu May 31, 2012 8:09 pm Post subject:

It runs pretty smooth. I did have a problem last year where it must have back fired up through the carb, because it burned a pretty good hole in my air filter, but it has been tuned properly since that happened.

66brm · Posted: Thu May 31, 2012 8:22 pm Post subject:

Ok it was just a thought that perhaps the backfire may have put a pressure pulse through the circuit. Same carb as previous?
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Dustin · Posted: Thu May 31, 2012 8:30 pm Post subject:

Same carb as in the picture, just the hole an inch to the left of the first one.

Dustin · Posted: Thu May 31, 2012 8:33 pm Post subject:

I was able to find a similar post about someone threading the hole, putting a plug in, and then epoxying over it all. Makes sense. Maybe that's worth a try?

66brm · Posted: Thu May 31, 2012 8:35 pm Post subject:

Yeah worth a shot, did you get these new or second hand, wondering if in its previous life it was left in an aggressive carb dip/cleaner/ultrasonic that may have loosened the plugs
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modok · Posted: Thu May 31, 2012 8:42 pm Post subject:

A press-in plug can be made of really any material, I kinda like brass
If you have some tools, like calipers, a full set of number drills, and a drill, a file, a grinder, you can make your own plugs.
Just make the plug like .001 bigger than the hole, dab of locktite and hammer it right in, better than new

the OE plugs are lead, and they get loose from oxidation eventually

Dustin · Posted: Mon Jun 04, 2012 4:05 pm Post subject:

Fixed it! Thanks a lot for everyone's help and suggestions!
-Dustin

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