BMW 5251 Service Manual page 292

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Camshaft Timing Chain
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lnstall crankshaft holding tool (BMW special tool 11 8 190/11
8 200). Make sure cut outs in tool engages openings in
damper assembly. While counterholding crankshaft with
special tool, remove crankshaft center bolt (A).
CAUTION-
Do not use flywheel locking tool to hold crankshaft stationary
NOTE-
The crankshaft hub centerbolt is tightened to a torque of 410
Nm (300 ft-lb).
4
Install crankshaft damper puller (BMW special tool 11 8 210)
to 11 8 200. and ( A ) remove damper from crankshaft.
The crankshaft must not be allowed to rotate when the timing
chains are loosened or removed. The pistons can contact the
valves. Use appropriate crankshaft holding tool when loosen-
ing crankshaft hub center bolt.
Using a drift of less than 5 mm diameter, drive two locating
dowels in left and right sides of lower timing cham cover to-
ward engine. Remove cover mounting bolts (arrows) and
carefully lift cover off.
CA UTION-
*
Use care when removing the cover from the cylinder heao
gasket. If the cover is stuck, use a sharp knife to separate
it from the headgasket.
If cylinder liead gasket Is damaged, remove cylinder
head and replace head gasket. See 113 Cylinder
head and valvetrain.
NOTE-
-
The chain cover can be removed with the coolant pump in-
stalled.
Use care when removing the cover from the coolant pipe
at rear.
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Push primary chain tensioner guide rail aside and remove
chain.