BMW 5251 Service Manual page 267

Camshaft Timing chain1
Tap locating dowels into cover until they protrude 2 to 3 mm
from sealing surface.
-
Using new gaskets, install lower timing chain cover:
Tap cover into position to engage dowels.
Install timing chain cover fasteners and tighten to 5 Nm (44
in-lb).
Drive dowels in flush to front of cover.
.
Tighten cover mounting bolts alternately and in stages.
Install cylinder head to timing chain cover fasteners and
tighten.
Tightening torques
Lower timing chain cover to block
M7 15
Nm
(1 1 ft-lb)
ME
20
Nm
(15
it-lb)
-
Replace front crankshaft radial seal. See Crankshaft oil
seal, front, replacing (M52 engine).
Install engine oil pan using a new gasket. See 119 Lubrica-
tion System.
Mount primary timing chain sprocket to primary cha~n so that
arrow on sprocket faces up. Mount sprocket to camshafl so
that tapped holes in camshaft are on left side of elongated
holes in sprocket.
4
Install adjustable timing chain tensioner (BMW special tool
11 4 220). Thread tool in finger tight until slack is removed
from chain.
NOTE-
BMW special tool 11 4 220 is an adjustable timing chain ten-
sioner that simulates the function of the hydraulic tensioner.
-
Check that elongated holes in primary sprocket are centered
to bolt holes in camshafl and chain is free of slack.
-
Install secondary timing chain guide and secondary chain
tensioner. Tighten mounting bolts (tensioner remains locited
down).
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