my 1980 300D is shifting very rough. i heard about changing something related to the vacum system but im not sure does anyone know what may be the problem? oil is clean. car has been sitting for a few years.

101 things it can be. Troubleshoot the vacuum system and then go from there.

http://dieselgiant.com/mercedesvacuumtroubleshooting.htm

__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

the finger on the white valve on top of the valve cover is worn out is this the cause of bad shifting? i am very confused of this topic because of other listings. and does my 300D have a green dashpot vavle ? i cant find it.

the finger on the white valve on top of the valve cover is worn out is this the cause of bad shifting? i am very confused of this topic because of other listings. and does my 300D have a green dashpot vavle ? i cant find it.

does anyone know?

anybody?

Depends. Some models use it for EGR, trans, or both.

It can cause shifting problems even if its for the EGR. The vavle(s) can leak and cause a loss of vacuum to the transmission. you should check it for leaks.

__________________
1976 BMW 2002- 100k
1995 BMW 325i 175k
1984 Mercedes Benz 300D Turbo Diesel- 270,000 mi

1981 Mercedes Benz 240D- Estimated 300,000+ mi Returned to the earth

I had to play with my vacuum set up for two weeks before I got it to behave in a way I could be happy with!
Mines an SDL and has MANY things that need tweeked!
yours should be pretty simple comared to mine!
ther'es ALOT of articles pertaining to this problem ~~~just be diligent!

__________________
[B]AlanT
BELEN NM


93 dodge cummins truck~old reliable
01 Volvo AWD XC70 Turbo Wagon
74 450 SE on the way out!
Recent: 1972 Toronado 56k on the clock!

IF it plugs in, lights up, makes noise,
I'M ON IT!