Modulator Replacement Help

[mbboy]

The original modulator in a 1981 380sl I'm restoring has a plunger and metal piston that fits directly into the transmission. However, the MB brand modulator I just got to replace the original has a long plastic pin that, according to alldatadiy and the website listed below, is supposed to be placed between the plunger and the piston presumably to account for temperature changes.

MERCEDES 722.3 MODELS 107 123 126 COMPENSATING PIN FOR THE MODULATOR VALVE IN EARLY 1981 PRODUCTION A PLASTIC COMPENSATING PIN WAS INSTALLED IN THE VACUUM MODULATOR AND THE CONTROL PRESSURE SLIDE VALVE (MODULATOR VALVE). THE COMPENSATING PIN ALLOWS FOR THE EXPANSION OF THE MODULATOR VALVE INORDER TO PREVENT VARIATION OF THE MODULATING PRESSURE DUE TO THE VARYING TEMPERATURE OF THE TRANSMISSION. THIS IS DESIGNED TO IMPROVE THE SHIFT CHARACTERISTICS OF THE TRANSMISSION DURING START-UP AND BEFORE THE


http://autorepair.about.com/library/faqs/bl160h.htm
http://www.alldatadiy.com/alldata/AFI~V13956416~C10083~R0~OD~N/0/41745938/56620861/56620871/56620872/34853741/34860071/34860072/56227463/14411668

However, the pin-piston combination is far too long to fit into the transmission housing, which was obviously designed for the old-style modulator. So I was wondering if anyone here can tell me how this newer modulator can be installed in the way the above sites show.

Thanks a lot for any info anyone can give me on this.

[Carson357]

the part in image 1 is removed (simply pulls out) and replaced by part in image 2
use caution as the shaft for the part in image 1 can break and will be difficult to remove,

be sure to adjust modulator pressure before you intall the white cap, when instaled it only allows for minimal adjustment, and can damage the modulator if not properly removed

[mbboy]

Originally Posted by Carson357

the part in image 1 is removed (simply pulls out) and replaced by part in image 2
use caution as the shaft for the part in image 1 can break and will be difficult to remove,

be sure to adjust modulator pressure before you intall the white cap, when instaled it only allows for minimal adjustment, and can damage the modulator if not properly removed

Problem is the original modulator doesn't have the plastic pin in image 1. The piston rests on a little metal nipple in the center of the the plunger. So the pin in image 2 can't replace the pin in image1, and putting the pin in between the plunger and the modulator makes it way too long to fit into the transmission.

[benzhord]

has anyone had the upper left 5mm hex striped. This bolt is rounded out and it's to tight for a dremel attachement. Any ideas? How hard would it be to lower the transmission just enough to drill it out?

[rsieracki]

Originally Posted by benzhord

has anyone had the upper left 5mm hex striped. This bolt is rounded out and it's to tight for a dremel attachement. Any ideas? How hard would it be to lower the transmission just enough to drill it out?

in other situtations (not the modulator) i have j-b welded a allen bit into the stripped out head and had success... be sure and clean all the grease and crap out of the stripped hex (brake cleaner etc) GOOD LUCK