Withdrawal
Attention: The description is given only for the M20 engine.
Remove the cylinder head and install it on 2 wooden spacers.
Remove rocker shafts.
Loosen the camshaft sprocket bolts. Remove the adapter for the distributor slider, casing and camshaft pulley. Do not lose roll pin.
Remove the two cover bolts from the front of the cylinder head.
Carefully pull the camshaft forward.
Installation
Thoroughly rinse all parts in gasoline, clean the contact surfaces.
Lightly coat the camshaft with engine oil and insert carefully into the cylinder head.
Caution: Be careful not to damage the bearing surfaces of the shaft.
Check the integrity of the O-ring and gland in the cover and replace if necessary.
Place the cover carefully so as not to damage the seal. In workshops, a BMW-112212 funnel-shaped sleeve is used for this. Screw on the cover.
Check camshaft end play.
Engine - Maximum allowable value, mm:
- M20 - 0.2
- M21 - 0.15-0.33
- M30 - 0.03-0.18
Position the camshaft pulley so that the roll pin fits into the hole in the camshaft.
Install the cover and adapter and tighten the camshaft mounting bolt to 70 Nm.
Install rocker shafts.
Install the cylinder head.