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1980 300D
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309 Posts
Discussion Starter · #1 ·
The delightful engineering marvel vacuum bleed valve on my 1980 300D is sputtering and only dropping from twenty to ten pounds of vacuum - as opposed to the zero vacuum it should be dropping to - causing my transmission to not shift automatically. A new valve costs around $180...

Can this be rebuilt, or must I purchase a new one?
 

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1980 300D
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309 Posts
Discussion Starter · #3 ·
Help! Spooky stuff going on. I checked all the vacuum lines to the bleed valve - no obstructions. To insure the vacuum leak was with the bleed valve only, I disconnected the bleed valve from the system, connected the vacuum line to the transmission modulator to the main vacuum line from the vacuum pump.
I took the car out for a drive, expecting the vacuum system would work for everything and the transmission to not shift. Here's the spooky part. The transmission SHIFTS PERFECTLY with no bleed valve. How can this be? Anyone out there experience same thing or have an explanation?
 

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1983 240D auto..soon to run a generator in the country.1984 300D turbo 4 spd
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149 Posts
Sounds like like a spooky blessing.
Luck
 
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