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#1
03-11-2012, 12:32 AM
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722.xxx transmission vacuum modulators
There are three revisions of the 722.xxx transmission vacuum modulator.
Factory build unit = the car was sold factory NEW with this one. Update #1. Update #2 Here are pictures of them explaining (best possible) the visible variation in design. . Last edited by whunter; 03-08-2013 at 01:26 PM. 
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#2
03-11-2012, 12:33 AM
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Factory build unit = the car was sold factory NEW with this one.
Most of these fail from use - old age. . Last edited by whunter; 03-11-2012 at 01:56 AM.
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#3
03-11-2012, 12:33 AM
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Update #1.
The technology of plastic/rubber advanced. Daimler looked at parts proliferation, and set engineers the task of reducing duplicate components where possible. The W126 vacuum modulator was more robust/advanced + the tooling was newer = more cost effective to drop the earlier unit. EPC makes note of the fact that the pin/cup MUST change to use the W126 part. More on that later. . Last edited by whunter; 03-11-2012 at 12:50 AM.
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#4
03-11-2012, 12:33 AM
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Update #2.
Daimler reduces cost/increases profitability by continuously looking at parts proliferation, and keeps engineers busy eliminating duplicate components where possible. The latest vacuum modulator is totally re-designed-engineered. Using the most advanced minimalist - simple design possible. The technology of plastic/rubber have advanced substantially. Engineers tweaked the new design for backward compatibility, and superseded all other units. . Last edited by whunter; 03-11-2012 at 01:46 AM.
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#5
03-11-2012, 01:21 AM
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What changed that matters to YOU when replacing this unit?
The factory original unit had a smaller diameter piston, and the cup bore was a perfect fit. Revision #1 had a LARGER diameter piston, and the ORIGINAL cup bore is to SMALL, if you try to force fit these, the plastic pin/cup will break. Revision #1 requires the (BLACK) NEW/superseded pin/cup, for proper fit - function. Revision #2 is a radical design change/complete kit, requires removal - discard ( as not needed) the old style pin/cup. ****************************************************************** Picture #1. Shows the factory unit with the factory pin/cup, and revision #1 with the (BLACK) NEW/superseded pin/cup. ****************************************************************** Picture #2. Shows revision #1 with the factory pin/cup pressed firmly in place, just short of breaking. ******************************************************************** Picture #3. shows the factory unit with the (BLACK) NEW/superseded pin/cup installed. Revision #1 with the factory pin/cup pressed firmly in place, just short of breaking. Revision #2 with the pin stub installed. ***************************************************************** Picture #4 and #5. Shows you the piston face. . Last edited by whunter; 03-11-2012 at 01:54 AM.
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#6
03-11-2012, 01:22 AM
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More pictures_1
Last edited by whunter; 03-11-2012 at 01:42 AM.
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#7
03-11-2012, 01:22 AM
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More pictures_2
Last edited by whunter; 03-11-2012 at 01:43 AM.
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#8
03-11-2012, 01:23 AM
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More pictures_3
Last edited by whunter; 03-11-2012 at 01:43 AM.
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#9
03-11-2012, 04:55 AM
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Nice thread! Can you put in image tags to make the pictures BIG?
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#11
03-12-2012, 10:26 AM
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Hmm
Quote:
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#12
03-12-2012, 11:45 AM
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Done
Quote:
                   
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#15
03-13-2013, 09:14 PM
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What are the part numbers for these?
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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2.88 diff,EGR blinded
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