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Author Topic: Vacuum Advance Adjustments  (Read 678 times)

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Offline Stolzy40

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  • Year_Model: 1951- 170S Cab A (Kemp Auto Museum)
Vacuum Advance Adjustments
« on: November 21, 2010, 07:03:31 PM »
Does anyone have intructions for installation and adjustments for the vacuum advance on a Bosch Distributor # VEU4 R6 as fitted on a 1951 170S Cab A? I thought I saw shop manual instructions for adjusting the advance linkage that attaches to the distributor plate but can seem to find it now. Any help is appreciated.
Thanks,
Mark Stolzenburg
Volunteer
Kemp Auto Museum
Chesterfield, Missouri, USA

Offline JohanE

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    • M-B Classic
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Re: Vacuum Advance Adjustments
« Reply #1 on: November 21, 2010, 11:28:23 PM »
Here are the pages in the Technical Gallery. I hope it is helpful.

http://www.170220.com/gallerytech/albums/170Workshop/Group%20E_Electrical/e34.pdf

BR

Johan
170 Vb, 1953 (W136) restoration project
C220 CDI 2012 (W204)
E220 Cab, 1995 (A124)
http://mbclassic.zix.se/index_en.html

Offline twigren

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Re: Vacuum Advance Adjustments
« Reply #2 on: May 07, 2017, 12:41:35 PM »
Have the same question, as the post years ago. Link doesnt work.
Anyone have some helpful info?
Practically I doubt if my vacuum advance unit really works?
Ppl say you could test this by manually sucking air, but i have no clue if the strength if enough or bot.
My pin doesnt move at all...
All available info very appreciated :-)
Thomas Wigren
Mercedes-Benz 170S, 1951

Offline CraigS

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Re: Vacuum Advance Adjustments
« Reply #3 on: May 08, 2017, 06:21:58 AM »
Don't see anything in the workshop manual relating to vacuum adjustment.

Offline Scott Montoney

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Re: Vacuum Advance Adjustments
« Reply #4 on: May 08, 2017, 08:17:29 AM »
Yes, I was able to move it by mouth.  Total travel is only about 1.5mm.   I am also not aware of an adjustment procedure although it does look like it is able to be adjusted a little.

Here is PDF file of a table with some specifications that may help.
The three columns on the far right are for the Vacuum Advance.
« Last Edit: May 08, 2017, 08:31:32 AM by Scott Montoney »
"Gertrude" a.k.a. "Troidl"
1952 - 220 Cabriolet B

Offline twigren

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Re: Vacuum Advance Adjustments
« Reply #5 on: May 08, 2017, 02:03:30 PM »
Thanks to both of you :-)

The travel is ok...but I simply cannot make it move by mouth. It's simple too hard to move.

I've read in several forums you should be able to move it by mouth.
The strange thing is I think my vacuum unit is OK - it holds the air pressure at least.
I mean, not very complicated unit, simply a membran operated by air pressure.

Question is HOW hard is the vacuum pressure, or should be at least?
Further, could the pin be stuck in some way, inside the unit?

Again. thanks guys!! Really appreciate your help here :-)
Thomas Wigren
Mercedes-Benz 170S, 1951

Offline twigren

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Re: Vacuum Advance Adjustments
« Reply #6 on: May 08, 2017, 02:05:48 PM »
@Scott - thanks for the very good document. Wonder why this isn't in the workshop manual. Quite essential info for repair, or restore things from scratch !!

:-)
/Thomas
Thomas Wigren
Mercedes-Benz 170S, 1951

Offline Scott Montoney

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Re: Vacuum Advance Adjustments
« Reply #7 on: May 08, 2017, 02:33:48 PM »
The publication this came from is:  Technical Data, Passenger Cars, December 1957 Edition.
The last time I checked, several years ago, this document was no longer being published.
I will attempt to upload the entire publication into the Reference section of this forum.
« Last Edit: May 08, 2017, 02:35:35 PM by Scott Montoney »
"Gertrude" a.k.a. "Troidl"
1952 - 220 Cabriolet B