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Leaky Webers
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ldsvwguy
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PostPosted: Tue Aug 28, 2012 12:34 pm    Post subject: Leaky Webers Reply with quote

My carbs are leaking pretty badly. I checked the diaphragm and that seal is good. What could the issue be? Here are some pictures of the manifold.
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Both sides are leaking like this. I am running new fuel line.
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Ragman
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PostPosted: Tue Aug 28, 2012 8:39 pm    Post subject: Reply with quote

Pictures of both sides of the webers would probably be more helpful in determining why said webers are leaking.
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ldsvwguy
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PostPosted: Tue Aug 28, 2012 9:35 pm    Post subject: Reply with quote

These are pictures of 1 manifold from both sides. are you wanting both manifolds?
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mrmarcdude
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PostPosted: Tue Aug 28, 2012 10:53 pm    Post subject: Reply with quote

Vw Guy- I think Ragman means post a picture of the actual carbs. It would be hard to tell where a carb is leaking from without seeing it.
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Ragman
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PostPosted: Wed Aug 29, 2012 7:34 am    Post subject: Reply with quote

Yeah man...let's see pictures of the carbs.
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ALB
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PostPosted: Wed Aug 29, 2012 9:09 am    Post subject: Reply with quote

If you haven't brushed or wiped off the carbs yet, put each on it's respective manifold and use the stain pattern to see if you can pinpoint where the leaks are coming from. If, for example, the leaks are starting at the manifold/carb joint, new gaskets, and possibly the manifolds being resurfaced is the fix. If it's further up on the carbs, get some fuel in the float bows and look around where the stains start.

PS- I just looked at your pics again and I don't think the leaks are at the carb/manifold connection...but spend some time looking at it and you'll figure it out.
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ldsvwguy
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PostPosted: Wed Aug 29, 2012 7:38 pm    Post subject: Reply with quote

Carbs are cleaned already. there was some residue pretty much near every possible screw on the carbs tough. The residue was visible where the linkage plate met the carbs too. I took them apart and the floats just slightly rubbed on the pin, so I cleaned and sanded the pin. I tore down the carbs completely and cleaned every thing. and every passage.
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PostPosted: Wed Aug 29, 2012 11:23 pm    Post subject: Reply with quote

Maybe you could use some uv dye in the fuel to see where its leaking since you cleaned them already. Its really bright stuff, and easy to detect (I use it for oil leaks). You need a special light though. http://www.oreillyauto.com/site/c/detail/INT0/374C...;ppt=C0050
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ldsvwguy
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PostPosted: Sat Sep 01, 2012 8:26 pm    Post subject: Reply with quote

After tearing them down, I found that the main paper seal between the float and main body was dry. I would guess that was the cause of the leak.
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udidwht
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PostPosted: Tue Sep 04, 2012 3:59 am    Post subject: Reply with quote

ldsvwguy wrote:
After tearing them down, I found that the main paper seal between the float and main body was dry. I would guess that was the cause of the leak.


Explain how?

If they were leaking where you state there should be signs of fuel. Your leak is likley elsewhere.

Based on the photos it's likely your float height is incorrect or you have excessive fuel pressure.
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ldsvwguy
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PostPosted: Tue Sep 04, 2012 5:47 pm    Post subject: Reply with quote

Yes, both the seal and the floats were way off. I adjusted the floats and put in new seals (greased). They are in now and I'm tuning them tonight. We'll see how they do now.
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scotth17
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PostPosted: Tue Sep 04, 2012 6:16 pm    Post subject: Reply with quote

An easy way to find little leaks (gas, oil, whatever...) is to get some Desitin foot spray. It sprays on and dries quickly to a white powder coating that will wick any moisture from the smallest of leaks and show up readily. When you're done, spray with simple green and wash off. Easy.... K2R Spotlifter works the same way and is available at Ace Hardware usually...
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udidwht
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PostPosted: Fri Sep 07, 2012 12:21 am    Post subject: Reply with quote

scotth17 wrote:
An easy way to find little leaks (gas, oil, whatever...) is to get some Desitin foot spray. It sprays on and dries quickly to a white powder coating that will wick any moisture from the smallest of leaks and show up readily. When you're done, spray with simple green and wash off. Easy.... K2R Spotlifter works the same way and is available at Ace Hardware usually...


Not quite useful with Webers since one will get fuel on the outside of them during operation. Doesn't take many miles before the fuel/varnish starts to show on the outside of the carb bodies. The paper gaskets wick quite a bit of fuel during operation. Also with the use of todays blended fuels the fuel crawls up the wall of the fuel bowl quickly. With the carb top off pour in some fuel about halfway and watch how quickly it climbs the wall of the bowl Shocked
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1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
71mm Stroke
73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
Bosch SVDA w/Pertronix module (7.5 initial 28 total @ 3400rpm)
Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
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icecold
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PostPosted: Fri Sep 07, 2012 8:04 pm    Post subject: Reply with quote

my carbs are doing the same thing as his. also my stacks are all black now too. I guess i better tear it down too.
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