Attention: If the valve actuator parts are to be installed again, they must be installed in their original positions. To do this, when removing them, they must be folded in the order of installation.
Withdrawal
Attention: The description is given only for the M20 engine.
Remove the cylinder head and install it on 2 wooden spacers.
![](https://www.bmwman.ru/img/ser5/0875.jpg)
Unscrew and pull out the lubrication tube 1.
Loosen the toothed pulley.
Set valve clearances to maximum.
Pull out plugs 2 from the front and rear axles of the rocker arms.
Pull out plate 3 fixing the rocker axles in the front part of the cylinder head.
Pull out the spring clips of the rocker arms.
Remove the exhaust rocker shaft. In this case, the cams of the cylinder 6 of the camshaft must be turned away from the rocker arms. Move cylinder 1 rocker arms inward and rotate camshaft towards intake valves until all rocker arms are unloaded. After that, pull out the rocker shaft.
Remove the intake rocker shaft. Rotate the camshaft towards the exhaust valves and move the rocker arms until out of unload. After that, pull out the rocker shaft.
Remove rockers.
Installation
![](https://www.bmwman.ru/img/ser5/0876.jpg)
Check rocker arms: Replace worn rocker arms or loose sliders -arrow-.
When replacing rocker arms, rearrange pin 5, eccentric 6, washer 7 and nut 8 on a new rocker arm. In this case, the thickened part of the eccentric should be turned down, and the hole outward. Turn the finger so that the cut side is facing the rocker arm. Then tighten the nut.
Attention: the pin and the nut have a fine thread M6x0, 75. Check the rocker shafts, replace the worn rocker shafts.
Install the rocker shafts with the large lubrication holes facing the valve guides and the small lubrication holes and retainer plate cutouts facing in.
Put on the rockers.
Put spring clips on the rocker arms in such a way that the flat surface of the clip enters the groove of the shaft.
Insert the fixing plate into the grooves of the rocker shafts.
Insert plugs.
Screw the toothed pulley with cover and the adapter with a tightening torque of 70 Nm.
Screw on the oil line.
Install the cylinder head.
Adjust valve clearances.