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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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Old 3rd April 2010, 08:31 AM
AAB AAB is offline
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Default Vacuum, door locking bellows

I had to remove the LH door locking vacuum unit ( tiny spring on manual locking broken ) & it is apparent that the rubber ( plastic ?? ) bellows are getting very dry looking.

They are not the originals ( would be 36 years old now !!), so,I would like to add some type of oil or whatever to try & soften them up a bit.

Any brilliant ideas out there ?

Regards,

Alex
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Old 4th April 2010, 11:18 AM
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WGB WGB is offline
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Default Re: Vacuum, door locking bellows

Any lubricant would have to be rubber specific.

In the past the rubber bellows pieces were available separately for minimal cost.

Here is an old thread where this was discussed with some links on how to find suppliers.

A car load of rubbers

Bill
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Old 4th April 2010, 06:27 PM
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Styria Styria is offline
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Default Re: Vacuum, door locking bellows

Hi Alex, my understanding is that Glycerine may help in softening the rubber bellows, but I would imagine that after a lengthy period measured in years it would be difficult to do much with the rubber bellows. Generally speaking, there are two problems associated with those bellows, the first being calcification of the alloy parts used in the units, and cracking of the rubber where it is close to the alloy metal ring that the rubber appears to me moulded to.

Generally speaking, it is the top bellows that are affected by the corrosion - I am pretty sure it's the tops that collect all the moisture and dirt that gets past the side window seals. The idea is to get as many units as possible from other cars, dismantle, rotary wire brush after taking the units apart. It is also important to wire brush the 'retainer hooks' that are attached to the alloy metal part that the rubber bellows are moulded to. It can all be a delicate operation and if you have enough dismantled spare bellows, you should be able to cobble together enough to get you out of trouble. There is always something satisfying when one can 'repair' quite simple items and make them work instead of having to outlay considerable amounts for complete replacement units. Try MB - they are surprisingly and nastily expensive. Regards Styria

N.B. One also needs to remember that the fuel filler flap and boot locking units are different to the units located inside the doors.
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Old 6th April 2010, 06:38 PM
John S John S is offline
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Default Re: Vacuum, door locking bellows

For W116 vacuum diaphragms, try part number MBZ022694, Randy Steel at http://www.AutoPartsGuru.com

A couple of years ago they were $12.11 ea. plus shipping -about $25-30, for as many as you need.
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Old 7th April 2010, 06:53 AM
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Styria Styria is offline
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Default Re: Vacuum, door locking bellows

Quote:
Originally Posted by John S View Post
For W116 vacuum diaphragms, try part number MBZ022694, Randy Steel at http://www.AutoPartsGuru.com

A couple of years ago they were $12.11 ea. plus shipping -about $25-30, for as many as you need.
Hi John, I have been in touch with the Company, and whilst the complete units are still available, the diaphragms are not - so they believe. I have enough on hand at the moment, so will not need new ones. Thanks heaps for the link. Regards Styria
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Old 7th April 2010, 11:49 PM
wbrian63 wbrian63 is offline
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Default Re: Vacuum, door locking bellows

Try this source for the diaphragms:

http://mercedessource.com/node/1044

To fix the entire car, you need 6 sets (2 sets per door, 3 doors).
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Old 8th April 2010, 06:39 AM
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Default Re: Vacuum, door locking bellows

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Originally Posted by wbrian63 View Post
Try this source for the diaphragms:

http://mercedessource.com/node/1044

To fix the entire car, you need 6 sets (2 sets per door, 3 doors).
Thanks for that information. It is good to know that at least someone still has those parts - I suspect it is the same supplier as that linked by WGB ? Just checked - yes, it is. Would they have the units for the fuel filler flap and boot as well ? Regards Styria
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