need a source for vacuum diaphragm (m110) - Page 2 - Mercedes-Benz Forum

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post #11 of 18 (permalink) Old 07-15-2016, 09:15 AM Thread Starter
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My hot spark is in a box somewhere! we moved about 6 months ago and i still haven't found it!

SO mike, are you saying the vacuum retard diaphragm will not be needed when i finally do find the hot spark and toss the points? I (naively) thought the retard/advance is still in effect with points or with electronic ignition. no?

I'd be happy to hear that. in that, any thing to get more variables like diaphragms / vacuums / points wearing down out and get perfect timing with fewer wear parts, the better. (i know points can be maintained and timed perfectly too, but still).

To recap: are you saying once i drop electronic ignition in, i won't need that diaphragm anyway?
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post #12 of 18 (permalink) Old 07-15-2016, 09:23 AM
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No. I think he is saying once you get the timing fixed with a new diaphragm, then switch to hot spark or pertronix.


I think it says above that the vacuum diaphragm is for vacuum retard. Right?

My 1973 v8 cars had a vacuum retard on the distributor that essentially retards the timing at idle, and I guess when you are cruising with your foot off the throttle pedal (creating high vacuum). The vacuum retard on my 1973 450sl cars shuts off when the AC is turned on (supposedly to overcome the extra drag of the AC compressor with some advanced timing).

Given the fact that the vacuum retard turns off with the AC on, I wonder just how important it is for anything other than emissions. I would probably always be more concerned about making sure the mechanical centripetal advance mechanism is working correctly giving you the correct timing at higher RPMs.

.

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post #13 of 18 (permalink) Old 07-15-2016, 04:30 PM
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No emission tests in your state? No timing retard needed.

I even heard of one guy who removed the mechanism arm link inside the distributor itself to disable the retard function. This kept the appearance of having a "fully functional" EPA mandated system.

Might just have been a rumor.
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post #14 of 18 (permalink) Old 07-15-2016, 05:19 PM
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Originally Posted by Fonzi View Post
Given the fact that the vacuum retard turns off with the AC on, I wonder just how important it is for anything other than emissions. I would probably always be more concerned about making sure the mechanical centripetal advance mechanism is working correctly giving you the correct timing at higher RPMs.
You are right Fonzi. Most cars in summer likely drive around with A/C on and as you say, the vacuum retard is deactivated even at idle.

The car wouldn't pass an emission idle test with A/C on. Presumably it is turned off when testing.

If the diaphragm is leaking (I once had one that did on M117), it would probably be best to plug the line until a new unit is found. Otherwise, you have a vacuum leak (albeit likely only a small one)

As to sources for the vacuum actuator, I have read that cars with the M110 engine sometimes show up in pick a part/salvage yards. Maybe owner or someone near such a yard could eventually find a good used one?

I checked EPC and it said that that part (A0001582818) was only used on M110.921 engines used in NA and in South Africa (no doubt for emission reasons) Interesting then why Norbert's German-workshop and Bosch service in Germany would provide a solution when most cars there would not have that part?? Perhaps the EPC is wrong and a similar part was used on Euro cars??

1972 350SL 4.5L - MBGraham, near Kingston, Ontario

Last edited by MBGraham; 07-16-2016 at 11:31 AM.
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post #15 of 18 (permalink) Old 07-24-2016, 06:02 PM Thread Starter
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It's an advance not a retard. There's only one box.
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post #16 of 18 (permalink) Old 07-24-2016, 07:18 PM
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Quote:
Originally Posted by tombot View Post
It's an advance not a retard. There's only one box.

The single pod 1973 v8 4.5 US Spec cars have centripetal advance and vacuum retard.

I don't know the m110 cars of the era. Sorry if we caused confusion or delay in getting the info you need.

.

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post #17 of 18 (permalink) Old 07-25-2016, 07:00 AM Thread Starter
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Originally Posted by nordfisch View Post
The part isn't available in Germany, too.

You can use the part of the newer K-Jet-models instead as I just learned in a mercedes-workshop that repairs classic cars.
The Bosch-Classic-Centers do the same.
Sorry - no parts#
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Hi Norbert. This is the closest answer I have found in a couple weeks of searching. Are you saying the same vacuum boxes are used on later injected cars? Which cars? Is there ANY CHANCE you can find that part number? The Mercedes parts shops here (USA) say there's no alternate part number listed for it so it would be great to know if there is an alternate just not in the database.

Any chance you could find out ?

Thanks either way!
Tom
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post #18 of 18 (permalink) Old 07-25-2016, 08:33 AM
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MercedesPartsCenter.com often takes an order but can't fulfill. However, the price is so cheap, I would place the order and see what happens.

https://mercedespartscenter.com/part...&siteid=215720

I also tried a cross reference to check if the part was used on any other vehicles and it only comes up on the 110.921 that was apparently only used on the 114.073 (m110 280c) and 114.060 (m110 280).

I am still curious to know exactly what that pod does to the timing and when.
EDIT: Oh... I checked the EPC and the vacuum line (A0001583535) that goes from the carb to the vacuum box does specify that it IS for advance, not retard. Hmm... so this is probably a pretty important part!

.

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Last edited by Fonzi; 07-25-2016 at 08:38 AM.
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