BMW 1999-2005 M3 Service Manual page 187

Cylinder Head Removal and Installation
5 of 21
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/1...
A minimum waiting time is required
for the hydraulic lifters to "bleed
down" after installing the camshafts
into the cylinder head, but before
synchronizing the crankshaft and
valve train timing. When the
camshafts are removed, the
hydraulic lifters can expand. This
expansion can cause increased valve
lift when the camshafts are bolted
down, possibly resulting in piston
interference.
Before installing camshaft carriers,
examine bearing points (arrows) on
hydraulic lifter bores for signs of wear.
Install camshaft carriers with hydraulic
lifters into cylinder head. Note marks
on carriers: (E) for intake side and (A)
for exhaust side.
Center camshaft carrier on pins
(arrows) at bearing positions 2 and 7.
Lift timing chain and place
-
exhaust camshaft onto exhaust
camshaft carrier. Place intake
camshaft on intake camshaft
carrier.
2/25/2009 9:42 PM