2001 BMW 540i chain tensioner

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Camshaft Timing chain]
4 Pull out exhaust camshaft splined shaft to stop.
- Make sure camshafts are secured in TDC position using
BMW soecial tools 11 3 240 and 11 3 244.
4 Preload primary chain tensioning rail:
Tighten adjusting screw on
BMW special tool 11 4 220.
Tightening torque
Primary chain tensioner preload
0.7 Nm (6 in-lb)
4 Preload exhaust camshaft spring plate by pressing on im-
pulse wheel. Tighten mounting nuts
(arrows) by hand. Do
not tighten fully.

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-- - -- - -- Camshaft Timing chain1
- Remove camshaft locking tools from rear of camshafts
- Remove BMW special tool 11 4 220 (adjustable primary
chain tensioner). Reinstall primary chain tensioner.
Tightening torque Primary chain tensioner to cylinder head
70
Nm (52 it-lb)
- Remove crankshaft locking tool from transmission bellhous-
ing. Reinstall sealing plug.
- Remove VANOS setup bracket from front of cylinder head
- lnstall VANOS control unit as described earlier in this group.
- Remove compressed air fitting (BMW special tool 11 3 450)
from VANOS control unit.
- Fit VANOS oil line banjo bolt with new seals. Attach oil line to
VANOS control unit.
Tightening torque
Oil line to VANOS control unit (banjo bolt) 32 Nm (24 H-lb)
- Remainder of installation is reverse of removal, noting the fol-
lowing:
lnstall spark plugs.
* lnstall intake camshaft plastic baffle prior to installing cylin-
der head cover. lnstall ignition coil packs and connect elec-
trical harness connectors.
Install radiator cooling fan.
- lnstall air filter housing and top engine cover.
Tightening torque Radiator cooling fan
(VISCOUS clutch) to 40 Nm (30 ft-lb)
coolant pump
Cyitnder head cover to cylinder head 10 Nm (89 in-lb)
Sparlc plug to cylinder head 25 Nm (18 ft-lb)

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11 7-50
/Camshaft Timing Chain
Timing chains assembly
(M52 TU and M54 engines)
1. Impulse wheel mounting nut
2. Camshaft impulse wheel
(exh.)
3. Spring plate
4. Thrust spacer (T
= 3.5 mm)
5. Primary chain tensioner
6. Torx screw
7. Exhaust secondary sprocket
8. Splined shaft
9. Secondary timing chain
10. Splined sleeve
11. Primary sprocket
12. Threaded stud
13. Secondary chain tensioner
14. Sprocket mounting nut
15. Spring plate
16. Splined shaft
17. Intake camshaft sprocket
18. Secondary chain lower guide
19. Thrust spacer
20. Camshaft impulse wheel
(intake)
21. Chain tensioner rail
22. Crankshaft sprocket
23. Threaded stud
24. Primary chain
25. Threaded stud
26. Guide rail
27. Threaded stud
28. Woodruff key

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11 7-52
Camshaft Timing Chain
Remove primary camshaft chain tensioner (arrow) from tim-
ing chain cover.
CAUTIOIG
Primary camshaft chain tensioning piston is under spring
pressure.
Press down on secondary chain tensionerand lock into place
using
BMW special tool 11 3 292 or a similar size wire.
Remove exhaust camshaft impulse wheel
rows). Remove impulse wheel (A).
4 Remove spring plate (A). mounting
nuts
(ar-

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1 17-54
Camshaft Timing Chain
4 Remove secondary chain tensioner mounting bolts (ar-
rows).
Remove tensioner while keeping locking pin in place.
4 Remove primary chain sprocket mounting studs (arrows) on
exhaust camshaft.
4 Lift primary chain sprocltet off exhaust camshaft. Remove
sprocket from chain.

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~ ~~ ~
I Camshaft Timing Chain I --
lnstall crankshaft holding tool (BMW special tool 11 8 190/11
8 200). Make sure cut outs in tool engages openings in
damper assembly. While counterholding crankshaft with
special tool, remove crankshaft center bolt (A).
CAUTION-
Do not use flywheel locking tool to hold crankshaft stationary
NOTE-
The crankshaft hub centerbolt is tightened to a torque of 410
Nm (300 ft-lb).
4 Install crankshaft damper puller (BMW special tool 11 8 210)
to 11 8 200. and (A) remove damper from crankshaft.
The crankshaft must not be allowed to rotate when the timing
chains are loosened or removed. The pistons can contact the
valves. Use appropriate crankshaft holding tool when loosen-
ing crankshaft hub center bolt.
Using a drift of less than
5 mm diameter, drive two locating
dowels in left and right sides of lower timing
cham cover to-
ward engine. Remove cover mounting bolts
(arrows) and
carefully lift cover off.
CA
UTION-
* Use care when removing the cover from the cylinder heao
gasket. If the cover is stuck, use a sharp
knife to separate
it from the headgasket.
If cylinder liead gasket Is damaged, remove cylinder
head and replace head gasket. See
113 Cylinder
head and valvetrain.
NOTE-
- The chain cover can be removed with the coolant pump in-
stalled.
Use care when removing the cover from the coolant pipe
at rear.
- Push primary chain tensioner guide rail aside and remove
chain.

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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.