Vanos Control Unit, Installing (M52Engine) - BMW 5251 Service Manual

Camshaft Timing chain1
VANOS control unit, installing (M52 engine)
CAUTION-
Incorrect installation of the VANOS control unit may result in
damage to the engine.
-
Make sure camshafts and crankshaft are loclted in TDC po-
sition with BMW special tools as described during VANOS
removal.
<
Rotate exhaust camshaft sprocket clocltwise (as viewed from
front of engine) using BMW special tool
11
5 490, until detent
position stop is reached.
4
Apply a small amount of liquid gasket sealer (Three Bond
1209 8 or equivalent) to VANOS housing alignment dowels
on front of cylinder head. Install a new gasket.
<
Push VANOS piston gear cup
(arrow)
into VANOS housing
until it bottoms out. Position VANOS control unit in front of
camshafts, but do not engage splines on gear cup.