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Old 02-14-2002, 01:58 PM
Registered User
Join Date: Dec 2001
Location: LaPorte, IN
Posts: 400
Question Set modulator pressure by feel?

Hoping to change modulator valve tonight on '89 560 SEL, but without access to my mechanic friend (he said it's some kind of holiday) so no pressure measuring equipment. From searching other posts, it seems possible to get this valve set pretty close by the feel of the shifts. Will taking that approach (until I can get an accurate reading and adjustment in a few days) cause much if any harm? Could it be worse than consuming a quart of fluid every 3 days?
Thanks for any input you can offer.
Earl McLain
'89 560 SEL
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Old 02-15-2002, 09:46 AM
dpetryk's Avatar
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
You cant hurt anything. I would set the new modulator to the mechanical mid point and go from there. Clockwise makes firmer shifts.

Is your fluid consumption a result of a leaky modulator??
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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Old 02-15-2002, 12:18 PM
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Join Date: Dec 2001
Location: LaPorte, IN
Posts: 400
Thanks for your reply Dave. Changed it last night, and after about 7 test drives got it pretty good. The first shift-24mph-is a little soft, and the second-34mph-feels a little firm. I'm about a half-quart high on fluid and need to suction that before any more adjustment. It will be interesting to see how close I got to 55psi by trial and error.

I replaced the vacuum lines from the trans to the intake manifold and then there to the fire wall and no sign of fluid after about 40 miles of driving. The gasket is also leaking a bit, and it looked like there may be a leak at the kickdown solenoid. Wev'e had the car for less than 2 months, and it shows signs of sitting idle.

The shift points seem a little close together, so the next hunt will be for the Bowden cable and sheck the adjustments there. Thanks again for the information--you are the tranny guru.
1989 560 SEL
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