BMW 5251 Service Manual page 268

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Chain
1
-
Install cylinder identification trigger plate to front of intake
camshaft.
-
Install spacer to front of intake camshaft
-
Install secondary chain sprockets and chain as an assembly
so that arrows on sprockets are pointing up. Center mounting
holes in sprockets to bolt holes in camshafts.
4
lnstall thrust washers and spring plate to intake cam
sprocket.
Tighten intake camshaft sprocket nuts.
-
Install VANOS control unit, see VANOS control unit, install-
ing
(M52
engine).
Tightening torque
Intake camshaft sprocket nuts to studs
(ME) 1011 Nm (8919 In-lb)
502117068
-
Unlock and release secondary chain tensioner,
4
Preload primary timing chain by torquing adjustable primary
chain tensioner (BMW special tool 11 4 220) to 1.3 Nm
(11 in-lb).
-
Tighten exhaust camshaft sprocket bolts in two stage
Tightening torque
Exhaust camshaft sprocket bolls (M7)
Stage 1 5
Nrn
(44
in-lb)
Stage
2 22
Nm (17 ft-lb)
-
Remove crankshaft locking tool and camshaft locking tools.
<
Align hub with keyway and tap into place. Insert new center
bolt with washer shoulder (arrow) facing hub.
CAUTION-
Inspect woodruff ley for damage before installing hub.
-
Attach crankshaft holding tool (BMW special tools 11 2
15011 1 2 410) to hub. Counterhold hub with tool while tight-
ening center bolt.
CAUTION-
Do not use flywheel locling tool to hold crankshaft stationary
to loosen or tighten cranlshaft hub center bolt. Use only the
special tools specified, or equivalent hub holding tool.