seeping shaft - solex 34 - kombi carbs

After rekitting the solex 34's in my 75 bay - the right carb is seeping fuel through the shaft (well that what is seems to be anyhow)



I believe they are able to be rebushed/ rebuilt - anyone done this before - any suggestions.

Cheers

Peter

This tends to happen when the float levels are set wrong I would check them first

BrisDubba wrote:After rekitting the solex 34's in my 75 bay - the right carb is seeping fuel through the shaft (well that what is seems to be anyhow)



I believe they are able to be rebushed/ rebuilt - anyone done this before - any suggestions.

Cheers

Peter

Hi Peter

to get them rebushed the hole is drilled larger then a bush is fitted.

Carburetor specialists would do this..

sounds like the fuel is running over the shaft/flap and out the shaft...

so, maybe the needle and seat aren't working when the bowl is full of fuel..

or too much fuel pressure from Your pump...
only need a couple of PSI.. [2psi]

Your pump may need shimming to lower the pump pressure..
if its an original vw pump

LEE

I have always oiled All moving parts on a carburetor
[just like VW mechanics did back in the 50s and 60s..]
this will help stop most wear...
LEE

give VVDS a call 02-9789-1777 as they have them rebushed and refurbished to make all new

there are a few different versions so you may have to remove and take some pics or remove and send down for corrrect supply of the throttle plates

they usually have several sets of the different versions in stock

Just when I thought the problem might be solved with Lee's suggestion about the fuel pressure. The dial was set to 3.5 so I wound it back to 2 and no obvious weeping..



I ran it at idle for 10minutes or so without seepage and then as soon as I turned it off the motor the seepage began....😠

I will change the needle and seat over and see if that changes anything. I didnt change them over as the ones in the kit looked pretty poor quality compared to the originals.

Cheers

Peter

BrisDubba wrote:Just when I thought the problem might be solved with Lee's suggestion about the fuel pressure. The dial was set to 3.5 so I wound it back to 2 and no obvious weeping..



I ran it at idle for 10minutes or so without seepage and then as soon as I turned it off the motor the seepage began....😠


I will change the needle and seat over and see if that changes anything. I didnt change them over as the ones in the kit looked pretty poor quality compared to the originals.

Cheers

Peter

try adjusting the height of the needle and seat with another fibre washer rather than replacing it. I had the same problem and it was this adjustment that fixed it

Cheers Silver, I did as you suggested and put another washer under there (either I misplaced the nylon ones or my kit had them as brass - either way I didnt have any nylon ones)

I ran it like before and it isnt seeping upon shut down, so hopefully that will have solved it.

I rang about the rebushing and it is $65per carb for the throttle plate, which was fine but I would have had to send down to them and then they send one up - so for the moment this has worked out okay, but will keep it in mind if the issue persists.

Thanks all (now onto my next item on the to-do list)

I have a week to get it on the road as I want to cruise along to action day (it is my daughters 3rd birthday so wont be able to stay long)

Peter

Definately float level related, rebush is for sealing air out, your fuel leaking is due to high float level or seeping needle/seat. When you turn off the engine, the residual fuel pressure actually rises due to the stationary fuel at the pump and in the fuel lines heating up and therefore expanding putting further load on the needle/seat. If it's not up to the task, it lets the fuel into the carb, which is also increasing in temp and the excess fuel goes down the throat of the carb.

an easy way to find if the throttle bushes are worn and leaking is when the engine is running get a length of rubber tube
one end in your ear and use the othe end around the throttle shafts
if there buggared you will hear them sucking air very easy time to replace