I bought my 1980 300sd the other day and I started to realize a possible vacuum leak due to hard shifting and the car not shutting off. I then realized that my motor was missing the vacuum module on the top back of the ip that goes to the transmission.

Luckily my parts motor had the unobtainium part that my motor was missing. Anyway, when I go to install the part it seems as though the ALDA is in the way. I am guessing that it would just need to be turned ccw slightly to allow the installation of the vacuum module.

I would guess that loosening the large nut under the alda would allow me to rotate the alda jusr enough. I just happen to not have the right size wrench to turn the large nut. Before heading to the parts store I am wondering if I am heading in the right direction. Also, does anyone know the size of that nut?

Thanks

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

I thought the same thing, But if you use and alen bolt, the module kind of slips under the lip of the ALDA and the round allen type bolt will have the room to turn. At least on my 300SD that is what happened.

__________________
83 300SD Dark Silver Dark brown inside

Interesting. I will have to look at it again. i do have the allen bolts, but I dont think that it is going to slip underneath the ALDA. Let me check again.

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

I double checked and there is no way that the module will fit in without moving the ALDA ever so slightly. I probably have to move it 1/8". I am using a module from a w123. My car is a w116. Would this be a problem or can I just slightly move the ALDA?

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

mine were both w126's

__________________
83 300SD Dark Silver Dark brown inside

You should be able to carefully move it enough with large channel-locks.

Or just take it off completely. You will be surprised at the low-end power increase.
Search "ALDA" & see what you might be missing.

do you mean that I should loosen the large nut below the alda 1st or just turn the alda with large channel locks directly on the alda?

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Loosen the nut first. It's captured on the IP, so it's going to seem like you are tightening it. Hold the ALDA and turn the nut CW.

__________________
mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)

Hold the bottom nut with a crescent or channel-locks.
Turn the ALDA counter clock wise.

I am guessing the PO had the ALDA off.
If the clocking distance/motion is small enough, I have tweaked the ALDA position counter clock wise with large channel locks directly on the ALDA.

Thank you for the responses. I'll look into taking the alda completely off, but I am going to guess that it wont be my cup of tea. What do you think about taking it off?

Thanks

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

IMO; it is a bad idea on the OM617, and not very good on the 60x engines.

Enough said. I'll just turn it a little.

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Care to elaborate?

Ian

__________________
Regards,
Ian White

1995 E300 Diesel w124 OM606
2014 E550 w212 M278 biturbo

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)

If you take the ALDA off, you'll be delivering more fuel. I would assume that you should figure out your exhaust gas temperatures before and after you modify fuel delivery.

It serves a purpose, but, if it doesn't work properly (or is maladjusted), it can cause performance loss. IMO, I'd rather burn just the right amount of fuel, rather than dump excess into the engine.

__________________
1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting