1999 BMW 525i Workshop Manual

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Clutch, removing
The procedure given here applies to both non-SAC and SAC
clutch assemblies.
- Remove transmission from engine. See 230 Manual Trans-
mission.
4 Loosen 6 clutch mounting bolts (arrows) evenly
- Remove pressure plate and clutch disc.
WARNING-
The clutch disc contains asbestos. Inhaling or ingesting as-
bestos dust can cause severe health problems. Always wear
an approved respiratorandprotective clothing when handling
components containing asbestos. Do not use compressed
air to clean components. Do not
grind, heat, weld, or sand on
or near anv asbestos materials.
Pull release bearing off transmission input shaft. Remove
clutch release lever by sliding it out of spring clip in direction
of arrow.
Clutch components, inspecting
- Inspect clutch disc for wear, cracks, loose rivets, contamina-
tion or excessive
runout (warping). Replace if necessary.
- Measure clutch disc lining thickness at shallowest rivet head. 7
Clutch and pressure plate wear limits
Minimum clutch disc lining thickness (at rivets)
1.0
mm (0.04 in) - Maxtmum lateral runout
(d~aphragm sprtngs to pressure plate) 0 6 mm (0 02 in)

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21 0-1 2
Clutch
Release bearing
Release
bearin
- lnspect flywheel for scoring, hot spots, cracks or loose or
worn guide pins. If any faults are found, replace flywheel as
described later.
- lnspect transmission pilot bearing in end of crankshaft. The
bearing should rotate smoothly without play. If necessary,
replace as described later.
4 lnspect and clean release bearing lever. Apply a thin coat of
grease to release bearing lever lubrication points (arrows).
Clean and lightly lubricate clutch disc splines and transmis-
sion input
shaft splines.
4 Checlc release bearing ball stud and spring retainer. Replace
if damaged or worn.
CAUTION--
On S6S 420G transmission, always replace release bearing
ball stud and retainer spring.
- Clean release bearing guide sleeve.
CA U TIOG
Do not grease guide sleeve. If guide sleeve is greased,
release bearing may stick to it.
Flywheel, removing and installing
(6 cylinder engine)
- lnspect flywheel for scoring, hot spots, cracks or loose or
worn guide pins. Replace flywheel if any faults are found.
Lock flywheel with BMW special tool
11 2 170. Remove
pressure plate and clutch disc as described earlier.
- Loosen and remove flywheel mounting bolts. Remove
flywheel.
- Clean flywheel bolt threads in crankshaft.

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Checlc flywheel location dowel
and correct installation. sleeve (arrow) for
damage
4 When installing dual-mass flywheel, position dowel sleeve
next to two locating notches
(arrows).
- Install flywheel using new self-locking bolts,
Tightening torque Flywheel to cranltshaft
(use new self-locking bolts)
120 Nm (89 ft-lb)
Use new self-lock~ng bolls lo rnslall llylvheel Do not reuse llle
old slrelch-lype bolls Do nor rnsrall bolls wrlh Loct~lo@ or srm-
I ilar thread licking compound. 1
Flywheel, removing and installing
(V-8 engine)
- Inspect flywheel for scoring, hot spots, cracks or loose or
worn guide pins. Replace flywheel if any faults are found.
4 Loclcflywheel with BMW special tool 11 2 070. Remove pres-
sure plate and clutch disc as described earlier.
- Use BMW special tool 11 4 180 (Ton. T60) to loosen and re-
move flywheel mounting bolts. Remove flywheel.
- Clean flywheel bolt threads in crankshaft

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210-1 4
1 Clutch
Dowel sleeve I
Check flywheel location
and correct installation. dowel sleeve
(arrow)
for . damage
< When installing dual-rnass flywheel, position dowel sleeve
next to two locating notches (arrows).
- Lightly oil flywheel mounting bolt threads and torque to
specification.
Tightening torque
Flywheel to crankshaft 105 Nm (77 ft-lb)
CAUTIOI\C
Do not reinstall flywheel bolls with LoctiteCTJ or similar thread
locl~ing compound.
- Install transm~ssion as descr~bed in 230 Manual Transmis-
sion.
4 If flywheel was replaced, check pulse sensor (arrow) for cor.
rect installation depth.
- Remove pulse sensor.

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21 0-1 5
Clutch
Use crankshaft pulley bolt to rotate engine in direction of ro-
tation until a full pulse tooth
(arrow) is centered in pulse sen-
sor opening.
Measure depth from pulse sensor mounting surface on trans-
mission to top of tooth.
Q Measure length (A) of pulse sensor from mounting surface to
end.
- Subtract length of pulse sensor (A) from distance to pulse
tooth from mounting area on transmission. This resulting
measurement is the pulse sensor air gap. Use shims avail-
able from
BMW to adjust air gap to specification.
Pulse air sensor gap
End of sensor to flywheel teeth 0.55 i-0.2 rnrn
(0.0217 i0.0079 in)
Transmission input shaft pilot bearing,
replacing
- Remove clutch as described earlier.
4 Remove pilot bearing from end of crankshaft using BMW
special tool 11 2 340 or equivalent puller.

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21 0-1 6
Clutch
4 Press new bearing into place using BMW special tool
11 2 350 or equivalent driver.
Clutch, installing (non-SAC)
CAUTIOG
Avoidcontaminating clutch friction surfaces with oilorgrease.
Do not touch these surfaces.
4 Center clutch disc on flywheel using centering tool
Clutch Clutch pressure disc plate
Dual mass flywheel -
5-speed transmission: Special tool 21 2 130
- Install flywheel lock, BMW special tool 11 2 170.
4 Install pressure plate and clutch disc to flywheel. Install and
tighten bolts hand-tight.
CAUTIOG
Be sure clutch disc is facing the correct way The disc should
be
marked 'kngine side" or "transmission side':
- Tighten each clutch bolt one turn at a time until pressure
plate is fully seated. Torque to specification.
Tightening torques
Clutch to flywheel
. M8 (8.8 grade) 24 Nrn (18
ft-lb)
- M8 (10.9 grade) 34 Nrn (25 ft-lb)
- Remove clutch disc centering tool.

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Clutch
- Remove flywheel locking tool
4 Inspect and clean release bearing lever. Apply a thin coat of
grease to release bearing lever lubrication points. Install re-
lease bearing. Bearing tabs
(A) align with contact points (B)
on release lever.
CAUTION-
Do not grease release bearing guide sleeve. If guide sleeve
is greased, release bearing may stick to it.
- Clean and lightly lubricate clutch disc splines and transmis-
sion input shaft splines.
- Install transmission. See 230 Manual Transmission
.
Transmission to engine
MB (Torx) 22 Nm (16 fl-lb)
MlO(Torx) 43 Nm (32 fl-lb)
Clutch, installing (new SAC components)
V-8 models and 1998 and later 6 cylinder models are
equipped with the self-adjusting clutch (SAC) pressure plate.
The SAC pressure plate, when new, comes from the factory
with a lock plate at the center which maintains spring tension
on the self-adjusting springs. This
loclting ring must not be re-
moved until the pressure plate is securely installed on tlie fly-
wheel with the clutch disk in place.
CAUTION-
Avoidcontaminating clutch friction surfaces with oilorgrease.
Do not touch these surfaces.
< Center clutch disc on flywheel using centering tool.
5-speed transmission: Special tool 21 2
142
- 6-speed transmission: Special tool 21 2 141
G6S-3782 transmission: Special tool 21 2 201
CAUTION-
Be sure clutch disc is facing the correct way The disc should
be marked "engine side" or "transmission side':
The large bolt in the clutch disc centering tool is used to
in-
stalland remove the tool only. Once the disc is in place on the
eel, remove the bolt to male room for tlie
SACpressure

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21 0-1 8
Clutch
- lnstall flywheel lock, special tool 11 2 170 (6 cylinder model)
or
11 2 070 (V-8 model).
- Install SAC pressure plate on dowel pins at flywheel. lnstall
clutch mounting bolts and tighten each one turn at a time until
pressure plate is fully seated. Torque to specification.
Tightening torques Clutch to flywheel
- M8 (8.8 grade)
MB 110.9 orade)
24 Nm (1 8 it-lb)
34 Nm (25
ft-lb)
Use 14 mm Allen wrench to unscrew (clocltwise or counter-
clockwise) lock plate in center of pressure plate.
NOTE-
The spring lockplate may make snapping noises while being
unscrewed.
Using large bolt, pull out clutch centering tool
Remove flywheel locking tool
4 Inspect and clean release bearing lever. Apply a thin coat of
grease to release bearing lever lubrication points. lnstall re-
lease bearing. Bearing tabs
(A) align with contact points (B)
on release lever.
- Clean release bearing guide sleeve.
CAUTIOG
Do not grease guide sleeve. Ifguide sleeve is greased, re-
lease bearing may stick to it.
- Clean and lightly lubricate clutch disc splines and transmis-
sion input shaft splines.
- lnstall transmission. See 230 Manual Transmission.
Tightening torques
- - - Transmlsslon to engine -
. MB (Torx) 22
Nm (16 it-lb)
MI0 (Torx) 43 Nm (32 it-lb)
* M12 (Torx) 72 Nm (53 it-lb)
.-