Remove/Install Propeller Shaft

REMOVAL AND INSTALLATION OF PROPELLER SHAFT







Removal and installation




1 Unscrew exhaust shielding plate (arrows).

4MATIC



2 Unscrew exhaust shielding plate.




3 Lift transmission and support.

4 Unscrew hex. head screws and hex. nut (arrows) and remove rear engine carrier with engine mount (not with 4Matic). Tightening torque hex. head screws 45 Nm, hex. nut 70 Nm.

4MATIC



5 Unscrew cross bridge (21). Tightening torque 25 Nm.




6 Loosen propeller shaft clamping nut (3) for approx. two turns without sliding back rubber sleeve (sliding along). Tightening torque 30 - 40 Nm, while paying attention to correct seat of rubber sleeve.




7 Remove front propeller shaft from transmission.

Note: Flexible coupling remains on propeller shaft.

Installation note: Renew self-locking hex. nuts. Tightening torque M 10 = 45 Nm, M 12 = 60 Nm.

Model 124.333



8 Remove front propeller shaft (lb) from transfer case. Renew self-locking hex. nuts. Tightening torque 55 Nm.




9 Prior to sliding back propeller shaft, loosen vulcanized fitted sleeves of soft pull-push flexible coupling installed on transmission end by means of a mandrel in flexible joint flange. For this purpose, use a cylindrical mandrel of 10 mm dia. and approx. 150 mm in length (not on models 124.333/393).




10 Remove propeller shaft from rear axle (arrows).

Note: Flexible coupling remains on propeller shaft.

Installation note: Renew self-locking hex. nuts. Tightening torque M 10 = 45 Nm, M 12 = 60 Nm.




11 Unscrew hex. head screws (7a) of propeller shaft intermediate bearing on frame floor. Tighten hex. head screws only after fastening propeller shaft to transmission and rear axle, tightening torque 25 Nm.




Note: On vehicles with manual transmission pay attention to correct seat of roller sleeves in vibration damper after tightening transmission- propeller shaft connection, press-in roller sleeves, if required (arrows).




12 Unscrew bracket for safety belt fixing on vehicles as of 09/89. Tightening torque of hexagon nuts 280 Nm.

13 Force propeller shaft from centering pin on transmission and rear axle and remove toward the rear.




Caution! If a separation of the propeller shaft is required, reassemble the parts again as shown. The front propeller shaft is provided with a hump and the fork-type joint of the rear propeller shaft with two arrow-type humps. The hump of the front propeller shaft should be located between the two arrows on fork-type joint (arrows).




14 Check flexible coupling, centering sleeves, vibration damper

Note: A soft or hard pull-push flexible coupling (except on models 124.333/393) is installed on the transmission and a hard flexible coupling is installed on the rear axle.




15 If during renewal of flexible coupling the vibration damper is separated from propeller shaft or the vibration damper is renewed, mount vibration damper and three-legged flange as shown.
The installation position is correct if the arrow on the vibration damper is mounted behind the hump on the three-legged flange. (Model 124 with a bolt circle diameter of 80 mm.)

Marking On 2nd Version As Of 1/90:

16 Model 124 with a bolt circle diameter of 90 mm. The installation position is correct when the arrow of vibration damper points to hump on three-legged flange.





17 With plastic or bronze bushings, grease cavities of both centering sleeves with Molykote grease and use multi-purpose grease with multicomponent bearing bushings (filling capacity per sleeve approx. 6 g).

18 For installation, proceed vice versa.