BMW 5251 Service Manual page 114

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Cylinder Head Removal and Installation
NOTE-
BMW
special tool 11 4 220 is an adjustable primary chain
tensioner and simulates the function of the hydraulic
tensioner.
-
Check that elongated holes in primary sprocket are now cen-
tered to bolt holes in camshaft and chain is free of slack. If
not, reposition sprocket to chain and reinstall.
-
lnstall secondary timing chain guide and secondary chain
tensioner. Tighten mounting bolts (tensioner remains locked
down for now using BMW special tool 11 3 292).
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Install cylinder identification trigger plate to front of intake
camshaft with studs.
-
Install spacer to front of intake camshaft.
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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 diaphragm spring to intake cam
sprocket.
I
2 h m
thrust washer
I
-
Install shim and torx bolts to exhaust camshaft. Tighten fin-
ger tight; do not torque down.
-
Tighten intake sprocket nuts.
CA U T I O G
Hold the camshaft stationary (at hex on camshaft) when loos-
enino or tiahtenino sorocket mounting bolts and studs.
Tightening torque
Intake s~rocket nuts to studs 10 + l Nm
(89
+9 in-lb)
-
Turn crankshaft approx. 30" in direction of rotation to bring
engine to TDC. Lock crankshaft in TDC position with BMW
special tool 11 2 300.
CAUTION-
The camshafts andcranlshaft must be lockedin the TDCpo-
sition using BMW special tools 11 2 300 and 11 3 240. If the
camshafts and cranl(shaft are not at TDC, the valves can
contact the pistons.