BMW 5251 Service Manual page 275

11
7-39
Camshaft Timing Chain
4
Cover oil hole in VANOS control unit (arrow) with shop towel
to capture oil which will spray when compressed air line is
connected.
-
Connect compressed air line to air fitting. Apply air pressure
set to 2
-
8 bar (30
-
110 psi).
4
With compressed air line connected, turn engine clocltwise
using crankshaft center bolt at least two rotations, until cylin-
der 1 is at (TDC) position (intake and exhaust carnshafl lobes
as shown arrows).
Do not rotate engine countercloclwise to reach the top dead
centerposition. Instead, complete another two complete
Remove sealing plug from bore under starter. Lock crank-
shafl in TDC position with BMW special tool 11 2 300
(arrow).
-
4
Unscrew and remove threaded studs (arrows) at rear of
cylinder head.