Rocker Arm Assembly: Service and Repair

11 33 050 Removing and installing/replacing all rocker arms (N55)





Special tools required:
^ 11 4 481
^ 11 4 482





Necessary preliminary work:
^ Remove cylinder head cover
^ Remove intermediate lever
^ Remove exhaust camshaft.

Important!
Roller cam followers (1) on intake side are divided into bearing classes.
The tolerance classes are marked according to the picture in numbers from 1 to 5.





Already used roller cam followers (1) may only be reused in the same position.

Detach roller cam followers (1) from HVC element and remove.

Place all roller cam followers (1) in neat order on special tool 11 4 481.

Installation Note:
Prior to installation of intermediate levers, ensure proper installation location of roller cam followers (1).





Classification of roller cam follower intake.

Series: Number 3. standard.
Number 2. slow idle.
Number 4. fast idle.

In case of repair: rough idling speed.

Fixture: 1
Number 1. slow speed in idle.
Number 5. high speed in idle.

Detach roller cam follower (1) on outlet side from HVC element and remove.

Place all roller cam followers (1) in neat order on special tool 11 4 482.

Installation Note:
Prior to installation of exhaust camshaft, ensure proper installation location of roller cam followers (1).








Remove HVC element (1) on intake side in direction of arrow.

Installation Note:
If HVC elements (1) are reused, they must be placed together with rocker arms in neat order in special tool 11 4 481.





Remove HVC element (1) on outlet side in direction of arrow.

Installation Note:
If HVC elements (1) are reused, they must be placed together with rocker arms in neat order in special tool 11 4 482.

Assemble engine.





Check function of DME; if necessary, readjust uniform mixture distribution.