1981 240D Question
Is there a way to adjust the automatic transmission linkage?
Problem is when you put the car in park it doesn't want to catch.
You have to really push forward on the shift leaver for it to catch.
Wife got out of the car while shopping and it started rolling away.
Otherwise the transmission operates fine.
Tried to search all post but have found nothing regarding this.
Thanks

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This question comes up often enough that it should be posted for new members.


#A. The most common issue is the shift ROD bushings crumbling = extreme slop in the forward and backward lever motion.

Broken Neutral Safety Switch and replacing shifter bushings - PeachParts Mercedes ShopForum
Replacing all shifter bushings on W126 - p.1 - PeachParts Mercedes ShopForum

#B. The second most common issue is Engine and Transmission Mount failure = changing the power-train position/alignment relative to the body and shift lever.

http://www.peachparts.com/shopforum/diesel-discussion/168733-transmission-mount-r-r.html
http://www.peachparts.com/shopforum/diesel-discussion/270782-where-buy-transmission-mount.html
http://www.peachparts.com/shopforum/diesel-discussion/287152-engine-mount-heat-shield-links-page.html


#C. The third most common issue is the Shifter Assembly internal bushings crumbling = up/down + left/right slop in the shifter.

Replacing all shifter bushings on W126 - p.1 - PeachParts Mercedes ShopForum


#D. A very rare issue is a mis-adjusted shift rod.

The rod is three pieces:
* The threaded rod.
* The adjustment locking/jam nut.
* The threaded adjustment sleeve.
The first attached picture shows the rod assembly.

Note: Many times the rod has not been touched since factory assembly = be prepared (outside your garage) to use at least a propane torch to thoroughly heat the sleeve and quench it in SAE 30 engine oil. The thermal shock + oil wicking into the threads should avoid serious disassembly damage.

#1. Disassemble the rod.
#2. Clean the rod threads on a wire wheel, and if they are moderately damaged run a die over them.
#3. Clean the nut threads with a tap.
#4. Clean the sleeve threads with a tap.
#5. Lubricate all threads with wheel bearing grease.
#6. Reassemble and install the transmission end of the shift rod.
Note; the transmission and shifter should be in the PARK position for the initial mounting-adjustment.
#7. Basically you want it centered to a no load alignment.
#8. You will need a trusted assistant to run through the shifter gear positions repeatedly (vehicle not running), with you under the car feeling/listening for the transmission lever position/click and verify rough alignments.

Warning: In the next step you must let the wheels spin up in each gear, Then use the brake to stop the wheels BEFORE going to the next shifter position, and especially before you put it into PARK.
Safety Warning: Get out from under the vehicle.
* The vehicle can shift under torque and fall on you.
* You can come against the rotating driveshaft and get drawn in.
* The rotating tires can throw anything stuck in the treads at potentially lethal speed.

#9. Before lowering the vehicle you need to start the engine and run through the gears, shutting down to tweak shift rod adjustment as needed.

Removal and install are covered in these links.
Broken Neutral Safety Switch and replacing shifter bushings - PeachParts Mercedes ShopForum
Replacing all shifter bushings on W126 - p.1 - PeachParts Mercedes ShopForum

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Attached Thumbnails

   

SALES SUPPORT
Phil Reinhardt
(888) 333-4642 or (208) 615-4005
philip@peachparts.com
Mon-Fri 10:00a-7:00p EST



Bushing, shift rod, x2
MB# 1159920310

Locking clip, shift rod, x2
MB# 0009942960

****************************

Bushing, spring pin/at the flex joint/base of the shift knob, x2
MB# 1152670950

Locking clip, spring pin/at the flex joint/base of the shift knob
MB# 912002006002

Bulb, shift position illumination
MB# 072601012110

Bushing, shaft, x2
MB# 1152671250


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