1999 BMW 528i exhaust

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... -.
rpp- --- Camshaft Timing Chain1
Timing chains, installing
(M52 TU and M54 engines)
CAUTIOI\C
The procedure outlined below assumes that the camshaits
are lockedin the
TDC installation position with speciallocling
tools as shown earliel:
- inspect timing chain sprockets. Inspect guide rail and ten-
sioner rail for damage. Replace any part that is worn
or dam-
aged.
NOTE-
If any sprockets are being replaced due to wear, the chain
should also be replaced.
4 Primary timing chain assembly
1. Primary chain tensioner
2. Chain tensioner rail
3. Cranltshaft sprocket
4. Exhaust camshaft sprocket
5. Primary chain
6. Anchor bolt
7. Guide rail
8. Anchor bolt
9. Woodruff key
- Install primary timing chain to crankshaft sprocltet and hang
upper end from exhaust camshaft.
- If necessary, replace crankshaft radial seal in cover. See
Crankshaft oil seal, replacing (M52 TU and M54 engines).

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Camshaft Timing chain/
Fit top sprocltet to primary timing chain and install on exhaust
camshaft so that pointer (arrow) on sprocltet lines up with
cylinder head sealing surface.
Position sprocket so that chain slack is on tensioner rail side.
4 Insert BMW special tool 11 4 220 in cylinder head and screw
in adjustment screw
by hand just until it contacts tensioning
rail and chain slack is removed.
NOTE-
BMW special tool 71 4 220 is an adjustable primary chain
tensioner that simulates the function of the tensioner.
- Make sure arrow on top primary sprocket is still lined up with
upper edge of cylinder head. Reposition sprocket if neces-
sary.

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11 7-60
Camshaft Timing Chain
< Install and tighten down threaded locating studs (arrows) in
end of exhaust camshaft.
Tightening torque Exhaust camshaft locating
stud 20 Nrn (15 ft-lb)
4 Install secondary chain tensioner on cylinder head.
- Make sure tensioner is locked in compressed position as
described earlier.
Fit exhaust camshaft splined sleeve, aligning gap in sleeve
splines with corresponding gap on
camshaft splines
(arrows).

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- Camshaft Timing chain]
< Slide splined shaft onto exhaust camshaft, aligning larger
tooth with corresponding gap of splined sleeve (arrows).
Slide splined shaft in further until
3 small or elongated slots
in splined sleeve are centered to
3 threaded holes in
sprocket.
4 Place intake and exhaust sprocltets in BMW special tool 11 6
180. Position spline gap on intalte sprocket (arrow) as shown
and place secondary chain on sprocltets.
< Carefully remove chain and sprockets from tool and slide
onto camshafts. Align gap in
intalte sprocket splines with cor-
responding gap in camshaft splines (arrow).
CAUTION-
Do not alterposltion ofsprocl(ets with respect to chain when
removing from
specfa1 tool 1 1 6 180.
4 Slide splined shaft onto intake camshaft until approx. 1 mm
(0.04 in.) of splines can still be seen.

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1 17-62
Camshaft Timing Chain
4 Install intake camshaft spring plate so that FRONT mark is
visible. Install mounting nuts (arrows) finger tight.
4 Worlting at exhaust side, insert sprocket mounting Torx
screws into threaded lioles (arrows).
Initially tighten screws to approx.
5 Nm (44 in-lb), then back
off one-half turn.
4 Fit thrust spacer (A) on exhaust camshaft.

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Camshaft Timing chain1
4 lnstall spring plate (A) to exhaust camshaft. Make sure that
F mark is visible.
NOTE-
If F mark is no longer visible, install spring plate as shown
Install exhaust camshaft impulse wheel, aligning
mark (B)
with top edge of cylinder head (A). Install mounting nuts (ar-
rows)
finger tight.
4 Pull out exhaust splined shaft until it stops
- Press down on secondary chain tensioner and remove ten-
sioner lock-down tool.

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~~~ ~
Camshaft Timing Chain -
< Preload primary chain:
Tighten adjusting screw on BMW special tool
11 4 220 to
specified torque.
Tightening torque
Primary chain tensioner preload 0.7 Nm (6 in-lb)
< Preload exhaust camshaft spring plate by pressing on im-
pulse wheel while tightening mounting nuts
(arrows) finger
tight.
4 Install BMW special tool 11 6 150 (VANOS setup bracket) to
front of
cyl~nder head timing case.
Tighten tool mounting nuts
(arrows) by hand, then tighten
down uniformly until special tool is firmly contacting cylin-
der head.
CAUTION--
Male sure allgasl(et material is removed from face of cylin-
der head. Clean sealing face and keep free of oil.

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Cp-- Camshaft -- Timing Chain
Secure camshaft sprockets and impulse wheels:
Tighten mounting screws
(A) on exhaust camshaft impulse
wheel to approx.
5 Nm (44 in-lb).
Tighten mounting nuts
(6) on exhaust and intake sprocket
assemblies to approx.
5 Nm (44 in-lb).
Torque down mounting screws (A) and nuts
(6) to iinal
specifications.
Tightening torques Sprocket assembly
to camshaft
initial torque
5 Nrn (44 in-lb)
Sprocket assembly to camshaft
M7 Torx screw (A) 20 Nm (I5 it-lb)
M6 mounting nut (8) 10 Nm (89 in-lb)
- Remove flywheel locking tool from transmission bellhousing
so that crankshaft is no longer secured.
- Remove camshaft loclting tools from rear of camshafts.
4 Crank engine over by hand twice in direction of rotation until
cylinder
1 intake and exhaust camshaft lobes (arrows) face
each other.
- Secure crankshaft in TDC position with BMW special tool
11 2 300.
4 Place BMW special tool 11 3 240 over camshaft ends and
measure clearance of tool to cylinder head surface.
NOTE-
* If the exhaust side of the tool is not flush with the head (gap
A), retime the camshafts as described laler in this repair
group.
Due to flexible sprocket design and VANOS control unit tol-
erances and play, the
intake side of special tool 71 3 240
may be up to
I mm (0.04 in) above the suriace of the cyl-
inder head (gap
B). This is normal. Otherwise, retime the
camshafts as described in
VANOS timing, checking and
adjusting (M52 TU and 11154 engines).
- Remove VANOS setup bracket from front of cylinder head
- Install VANOS control unit. See VANOS control unit, in-
stalling
(01152 TU and M54 engines).
- Install intake camshaft oil baffle