BMW 5251 Service Manual page 311

Camshaft Timing Chain1
lnstall timing chain and intake sprocket to intake camshaft on
right cylinder head. While pressing in on chain tensioner rail,
confirm camshaft flange bores (arrows) are centered in
sprocket mounting slots.
NOTE-
Pressing in on rail will remove slack and reposition sprockets.
If necessarx remove sproclets and align bores centrally.
lnstall intake camshaft sensor gear with notch upward (ar-
row) at right cylinder head.
-
Finger tighten mounting screws.
-
lnstall remaining sprocket bolts to intake camshaft finger tight
at left cylinder head.
-
Press timing chain tensioning rail against timing chain. lnstall
plastic wire tie, to hold rail against chain.
-
lnstall lower timing chain cover:
Clean sealing surfaces and check sleeves are properly
seated.
Apply a thin coat of Three Bond 1209 8 to front and back
of new seal. Also coat joints where block meets cylinder
heads and oil pan.
Initially hand tighten bolts in alternate sequence to firmly
seat cover.
Tighten fasteners to final specification in alternate
sequence.
Tightening torques
Lower timing cover
M6
bolts
10 Nrn (89
in-lb)
M7
bolts 15 Nm
(1 1
ft-lb)
ME
bolts
22
Nm
(1 6
ft-lb)
M10
bolts
47
Nm (35 ft-lb)
-
Replace radial seal in lower timing chain cover, then reinstall
crankshaft hub, center bolt, and vibration damper. See
Crankshaft oil seal, replacing (M62 and M62 TU engines).
-
lnstall oil pan with new gasket. See 119 Lubrication Sys-
tem.
-
Lock crankshaft in place with BMW special tool 11 2 300