Dellorto DRLAs Flooding? (again)

[Danwvw]

I bought an old Dell 36 drla on a single manifold and went through it set it up for duals and paired it with another Dell 36 drla I have and today I put them on my test engine and I have this gas leak like everyone above is talking about.

After isolating the float and fuel pump (Proving to myself their not the problem) I find it's dripping out the progression holes and flooding into my engine.

With the top off if I pour gas (I'm using rubbing Alcohol) into the bowl it flows right through kinda of dribbles stops then gets some air and goes again until the float bowl is down to the level the progression clean out. With the clean out screw plug off it comes out there and not into the engine.

This thread is so old none of the links above work.

It's only doing this on 1 barrel. How do I fix it. Anyone!
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[modok]

https://www.thesamba.com/vw/forum/viewtopic.php?t=407809

[esde]

If it's just one you would be wise to do both. It's not an easy job, tapping the 8-32 threads between the two jet wells, and then gluing the plug in there. Blackline does it, and maybe mcdragracer here on the forum.
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[Danwvw]

[Danwvw]

Gas is coming out a hole in the progression clean out access with this plug out it does not run into the engine. So is the plunger or whatever it is that's sticking behind that small round silver plug above where it's running out?

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[Danwvw]

Fish around etc... Then hit it with carb cleaner spray. It shoots out the top idle vent hole. (Guess that's the Idle Air Jet!)
It did hold gas after this cleaning when I poured it in well sort of, Until I put it back together thinking I had if fixed and tried cranking the engine again then it went back to doing the same thing. Nearly hydro locked the engine it's leaking through so bad.

Just reading more, Wow! Is this ever not going to be easy! So It's a plug deep inside my carb that is leaking gas not a valve acting up in there! Guess all the cleaning in the world is not going to fix this.

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[chubby53]

send them in to get fixed. My buddies did the same thing. I noticed after i rebuilt them for him. just sitting on my bench with gas in the bowl, it would leak out all over. i think it was around $60-80 with shipping for one carb and walla!! no more problem.
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My build:
http://www.thesamba.com/vw/forum/viewtopic.php?t=385100

[Danwvw]

Thanks, I may do that there is a guy here in Oregon. These carbs are spares! Be nice to have them cleaned up, I think it's $110 though. So this is a really important test to do before they go on the engine. I took it off the engine and am checking it with water. And I think the internal plug is gone out of this carb. Going to have a look, I am going to drill into the lead plug there on the outside with a 8-32 tap size drill, or is it 10-32 any how Just curious to see what I find.

Here:

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[esde]

Water in the carbs is one of the things that causes it, I think. It settles to the bottom of the float chamber, where those plugs are, and slowly rots the lead. I'd think twice about drilling into them, depending on who's going to fix them. Not everyone is keen to fix and reassemble something you've done exploratory surgery on.
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[Danwvw]

Ok drilled it out carefully (Just the outer hole) and used a 10X32 tap which was a little too small for the hole that was originally there on the outside.

The plug was about 27.5 mm inside the carb. I taped it back in about 1 mm maybe 2 further and tested with water. It seemed to be sealing so after drying the carb I dabbed some (Blue Permatex #24200 threadlocker) in there using the butt end of the drill bit and plugged the outer hole using JB-weld and a 10X32 stainless steel Set screw. It fit too loose to seal so that is why I had to use the Jb-weld on just the outer plug.

I will let it cure a few days before trying it on the engine.

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[gprudenciop]

Ahhh. Good Ole dellorto drip!!

On the first carb I did this on I used stainless set screws and had them leak becouse of the difference in expansion when the carb is heated!
I recommend you listen to the guy in the thread Modoc linked and find brass or aluminum plugs..

Can prevent vw fires.....
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Never look down at anybody unless you are helping them up..
Loaning someone your strength instead of reminding them of their weakness = kindness..

[modok]

Yeah.
As you know, I preach loctite and press-fit. It is the way!
Its not intuitive.
One must have faith in things you cannot see.

This guy, is a unique individual, goes with what he knows.
Nothing wrong with that, maybe he will join me in my faith, or maybe he won't!

[Danwvw]

I looked all over town yesterday for a brass set screw. Could only find stainless! Right now it's got blue locktite which seems to not dry with the dellorto body material Zinc or lead whatever it is? (Have it on the Wood Stove drying!) We will see if it seals the existing lead plug! (The Permatex Activator is $23 and that is with the fisherman's discount!) So didn't try that. Actually these carbs after I am done setting them up for a 1600 are just going back into storage.
There is this guy "Type 5 Joe" here in Oregon that posted the quote below on "modok's" link above that I think I will send both carbs to before running in a car, if I find an engine to run them on, as I have no way to tell if what I did will seal gas from leaking long term.
Will give the carb a try on the engine again in a few days and post here.

[modok]

brass set screws?
It's in the basement right next to the brass magnets.

[Danwvw]

Ok Got the carbs on the engine today to test them and this procedure I did above worked. The carb no longer leaks down.
But!
The other carb though! These were mismatched carbs, I am trying to make a matched set. I had to get new holders and everything brass for them. But I can't get the engine to fire on the side with it.

It turns out it is pulling a lot of gas out the main nozzle of the auxiliary venturi.
Starts doing this as soon as I give it even a little throttle. Can't get the engine to fire on this side at idle or at any throttle!

Spent all day playing with the float levels. Tried float adjustments that vary gas levels on the problem carb as much as 10mm from 38mm gas to 28mm, measured with the carb fully assembled, top on, through the hole. Way too much gas flows out the main nozzle regardless.

I tried blocking the main jets with wood toothpicks and that does stop the gas.

Tried smaller main jets still does it.

What am I missing here, is there something somewhere that keeps this from happening that is missing. Is it due to something with the Idle circuit?
_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[esde]

Not sure about your recent issue, that's a separate problem, but good that you plugged the hole. I'm not certain that blue loctite is good for fuel, but I do know that green is, and you can apply it to an already assembled part. It's "sleeve retainer" and will wick into the joint very nicely. On the last Dellorto I fixed, after getting the (stainless! Ha!) screw where I wanted it, I used a small wire to guide the loctite down on top of the screw. I'm sure it will keep me from ever getting the screw out, but it's sealed for sure.
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[Danwvw]

The Blue Locktite threadlocker has now held for 24 hours and is continuing to hold.
The Problem with the other carburetor has been resolved. It turns out the jetting was way too rich for this 1679cc, Dellorto 36, 28mm venturi engine. (1.35 mains .60 idles) and that was combined with a problem on the Idle Adjuster screws that I had too big of washers for and the wrong O rings so they were hanging up all the way in. This was quite a fiasco to sort out. Waisted a lot time changing float levels and cleaning SparkPlugs, Checking Main jet flow by looking into the carb, Plugging and un-plugging Main jets with toothpicks, and checking the main jets for seating.

Jetting is now (1.22 mains .52 idles) Runs strong on both carbs.

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[gprudenciop]

Just to be clear. Aluminum expands at a very very different rate than stainless! So just be careful it might not happen right away but you could have a major problem later... I bet you haven't heat cycled that carb like it's going to happen when in service....DANGER WILL ROBINSON!!!!
_________________
Never look down at anybody unless you are helping them up..
Loaning someone your strength instead of reminding them of their weakness = kindness..

[Danwvw]

It may be wrong to use stainless steel that's why I didn't use it in place of the inner Lead Plug between the (idle passage and the main jet well). I just used some threadlocker on the old lead plug and tapped it in a bit there. I will post here if it fails.

That outer stainless set screw is virtually surrounded by a thick deposit of JB-Weld the Stainless Set screw barely stayed in the hole without the JB-Weld. I fully expect the JB-Weld to fully take up the difference in expansion without coming loose. I will post here if it fails.

What is the carb made out of, Someone said they were Zinc?
Zink 19
Aluminum 13
Brass 11
Stainless 9
Lead 16

Linear Expansion Chart

Further discussion on JB-Weld.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[esde]

The bodies are aluminum.
About the different rates of expansion, with such a small plug and the relatively low temperature of the carbs, it is likely not ever going to be an issue. Maybe if you tapped sloppy loose threads, but really the way to do it is just tap the threads just deep enough that the plug snugs up where you want it and then lock it there. There is no reason to run the taps as deep as you can. Seating the lead back in was a good call; I read an English blog where someone used birdshot, and got them seated and fixed it the same way.
SD
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.