WEBER carbs are out of order (The original blog was written on 15th Aug. 2007)

I connected the fuel hoses to the WEBER carburetors and turned on the ignition. The fuel pump started to make the operation sound. But it didn’t stop. I thought it was strange and checked the engine room, then, I found that the gasoline was overflowing from the WEBER carbs!!! (There is no photo because I was in a panic…I’m sorry.)

I guessed that the floats of the WEBER carbs were sticking. I removed the top cover of the WEBER and took out the floats to clean. Yes, the floats were sticking as I guessed. I cleaned them and adjusted the float level, then, the overflowing was stopped.

However, the engine didn't start despite adjusting the float level. The first firing came, but it didn’t continue. After I checked several points I found:

the fire on the sparkplug was okay
the engine started if gasoline was sprayed from the inlet port of the WEBER
the engine started if choke was operated and idle at 500rpm,
then the engine stopped if the throttle was opened or choke was returned
the accelerator pump of the WEBER for #3 and #4 cylinder was sticking

As everyone thought, the WEBER which slept for 10 years needed to be overhauled!!!

Comments

Clutch master cylinder overhaul #2: tough match

I disassembled the removed clutch master cylinder. And I found that the piston was heavily rusted. I tried to hit it with a hummer , Pushed the piston using the vise clamp like this. However , the piston was heavily sticking by rust and it could not to be moved today. The brake master cylinder was replaced in the past , however , the clutch master cylinder was not. Therefore , the condition of the clutch master cylinder might be worse. Tentatively , I would spray the rust-penetration lubricant from both sides of the piston and try again in a few days. If it doesn ’ t work , I would give up the overhaul and order the new part. ( My original blog was written on 2nd July 2009 )

Clutch master cylinder overhaul #3

I was still struggling with the sticking piston of the clutch master cylinder. I thought I should give up and look for the new part for the replacement. And to for my curiosity , I started to destroy and disassemble the clutch master cylinder piston by drilling. When I was drilling the piston halfway , I didn ’ t have any specific idea , however , I thought to tap the piston to make the thread. I started to turn the tap handle , and I felt the feeling that the piston was moved. So , I tried to pull it , and then suddenly the piston was removed from the cylinder. Finally I could extract the rusty piston! I observed the extracted piston. It looked there was no risk of the leakage of the fluid because the hole I made in the piston was not penetrated. Thinking the function that this part only holding the rod connected with the clutch pedal , it could be reused if the hole would be filled by the hard material. However , be...

Next task is to overhaul the rusty clutch master cylinder

The overhaul of the brake master cylinder was finished and I ’ ve started the overhaul of the clutch master cylinder located at next to the renewed brake master cylinder. I started from the removal of the pipe lines. In one of the pipe lines , however , the flare nut and pipe were stuck together. The pipe would be twisted in case the flare nut was turned. I tried several methods , such as blowing the lubricant or knocking the nut , to avoid collapsing the pipe. However , it seemed there is no way. So , I gave up rescuing this pipe line. I separated the other end of the pipe ( clutch slave cylinder side ) and removed the clutch master cylinder with the pipe line. I had to create the new pipe line by copper pipe. I ’ ve started to look for the pipe flaring tool on the internet auction. I did one another small improvement. The O rings at the acceleration pump jet plugs of WEBER carbs were deteriorated by gasoline so that...

The day my "onboro ALFA" would revive

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