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  #1  
Old 09-01-2012, 06:25 PM
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WTB: Change-over switch

At least I think this is what it is called. Itīs a combination vacuum and electric switch/valve in the shape of a bell with 2 vacuum connections and 1 2-lead electric connector on the bottom (on the w123 mounted directly behind the left headlight just below the electronic ignition box on fender well).
001 540 86 97 is a good number and this part is used on various series of gassers. And yes, I'm still looking.

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Last edited by 280EZRider; 09-07-2012 at 04:43 PM. Reason: clearity
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  #2  
Old 09-01-2012, 08:56 PM
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Part Number??

Can you include a part number a your shipping location for costs??? jim
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Old 09-01-2012, 11:23 PM
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Quote:
Originally Posted by jim16671836 View Post
Can you include a part number a your shipping location for costs??? jim
I suppose everything is closed Monday, so Iīll try to get the part number from the dealer on Tuesday. Shipping to 95426
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Old 09-02-2012, 12:23 AM
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Try 001 540 86 97.

Sixto
87 300D
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  #5  
Old 09-02-2012, 01:31 PM
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Pictures

Can you take some pictures of the part??? The location also? Thank you Sixto for the part number... jim
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  #6  
Old 09-02-2012, 02:00 PM
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The vacuum valve in question is connected to the retard side of the vacuum advance. On closed throttle a vacuum port just below the throttle plate supplies vacuum through the open valve to retard the timing point. With the A/C on, that vacuum is cut off by the closed valve, and the distributor vacuum line is simultaneously opened to atmosphere, thereby allowing more advanced timing to improve idle speed and reduce the chance of overheating.

If you are of a mind to do so, the valve can simply be defeated by disconnecting the vacuum line either at the distributor or at the switch-over valve, which will result in a condition of slightly more advanced idle timing.

Last edited by Frank Reiner; 09-02-2012 at 06:31 PM. Reason: Add'nl. information
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Old 09-02-2012, 08:16 PM
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still looking? i think i could come up with one for you, ive got 25-30 parts cars from the 70s to the 90s
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  #8  
Old 09-02-2012, 08:19 PM
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Quote:
Originally Posted by Frank Reiner View Post

If you are of a mind to do so, the valve can simply be defeated by disconnecting the vacuum line either at the distributor or at the switch-over valve, which will result in a condition of slightly more advanced idle timing.
OK, I had it backwards - no vacuum w/AC at idle. If I cap both ends and remove the line completely, wonīt this result in too much advance above idle?
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Old 09-02-2012, 09:47 PM
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If you are anticipating replacing the valve at some point, leave all the vacuum lines in place, unplug the line w/hose at the distributor, plug the hose, and leave the distributor nipple open to atmosphere. If the distributor nipple were closed, air would be trapped in that side of the diaphragm, which would impede the motion of the diaphragm under the force of vacuum applied to the advance side of the unit. So, leave it open.

The range of motion of the vacuum advance mechanism amounts to about 4 degrees on the retard side. 4 deg. is not too much; in fact it will probably provide just a wee bit of a gain across the board. In my M110s idle advance of 10 deg. BTDC with out vacuum works very well.
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Old 09-05-2012, 12:05 AM
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Thanks, sixto.

001 540 86 97 is a good number and this part is used on various series of gassers. And yes, I'm still looking.
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Old 09-07-2012, 04:45 PM
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Still looking. Bumped up.
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  #12  
Old 09-08-2012, 12:59 PM
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I've got changeover switches with the twin-lead electric connection and one- or two-port vacuum connections--some with connections on the top and the bottom of the bell--others with all connections below--this from a '73 280 USA version sedan with an M110 and Solex

Tim Kraakevik
kraakevik@voyager.net

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