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#1
05-13-2019, 11:40 PM
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280SL downshift 'clunk' when slowing to a stop
My '69 SL automatic makes a rear end clunk sound when I slow down to a stop...it's much less after I adjusted a switch at the air flow butterfly near the air cleaner...I read there is an adjustment that is often mistaken for an idle screw that is used only for adjusting the shiftdown switch to the tranny...I had a hell of a time readjusting all the linkages and timing to get a smooth idle again and good performance, but there is still some clunking going on. So my question is, could there still be a trans adjustment required, or could I have too much rear axle lash now? I've heard this is a common thing on early MB automatics...
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#2
05-14-2019, 08:23 AM
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Quote:
It is also worth checking all of the resilient drive line bushings and engine, gearbox, subframe / differential mounts for excessive play as well
__________________
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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#3
05-14-2019, 10:28 AM
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There are a couple of bushings on the rear axle that can make noise but I would be looking at your kick down solenoid on top of your transmission. This solenoid controls modulator pressure and the control rod attached to it needs to be able to move freely.
Without starting your engine, turn your ignition on and then press your gas pedal right to the floor. You should hear a loud click as the linkage is pushed forward. If you don't hear anything check to see if you have power going to the switch. If you have power and the linkage isn't moving the solenoid is probably seized up. It can be removed and freed up.
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#4
05-14-2019, 01:13 PM
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This sounds exactly like what my roommate's 1965 W111 220S does when slowing to a stop. It was converted from Zenith to Weber carburetors, and the Weber carburetors don't have a space for a throttle position sensor, which unlocks the transmission so it doesn't clunk when slowing to a stop.
All the automatic cars that were converted to Webers have this problem. In your case, it may just be that the throttle position sensor went bad. It attaches to one carburetor by the linkage and the wires go down to the transmission.
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Stop paying for animal enslavement, cruelty, and slaughter. Save your health and the planet. Go vegan! I did 18 years ago. https://challenge22.com/ DON'T MESS WITH MY MERCEDES!  1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C 1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles
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