BMW 5251 Service Manual page 280

Camshaft Timing Chain
Insert BMW special tool 11 4 220 in cylinder head and bring
adjustment screw into contact with tensioning rail.
NOTE-
BMW special tool 11 4 220 is an adjustable primary chain
tensioner that simulates the function of the tensioner.
Preload primary chain tensioner rail:
Tighten adjusting screw on BMW special tool 11 4 220.
Tightening torque
Primary chain tensioner preload
0.7
Nm
(6
in-lb)
4
Unscrew oil pressure pipe from VANOS control unit. Remove
banjo bolt from oil pressure line and install BMW special tool
11 3 450.
CA
UTIOPI-
Cover top of VANOS control unit with lint-free shop cloth. At-
tachment of compressed air line will force oil to spray out of
-
Connect compressed air line to air fitting. Apply air pressure
set to 2
-
8 bar (30
-
110 psi).