2001 BMW 525i Front

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11 3-73
Cylinder Head Removal and Installation /
1
- Remove viscous clutch cooling fan. See 170 Radiator and
i Cooling System. i i I 4 Remove ignition coil fasteners and coils (noting location of
~ ground strap).
1
Remove sparlc plugs.
i
Remove oil distribution tube fasteners and remove tubes
from both cylinder heads.
4 Using crankshaft center bolt, turn crankshaft cloclcwise until
number one cylinder (front cylinder right side) is in
TDC (ar-
rows).

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1 13-76
Cylinder Head Removal and Installation
Remove fasteners from intake camshaft sprocket (arrows)
on right cylinder head.
- Remove primary timing chain sprocket and suspend timing
chain using mechanics wire to prevent chain from dropping
into lower housing.
Turn crankshaft counterclockwise until
45" mark on crank-
shaft is aligned with boss on front timing chain cover (arrow)
4 Loosen cylinder head bolts in sequence 1-10 as shown (ar-
rows) and discard used head bolts.
- Evaluate cylinder head. See 116 Cylinder head and val-
vetrain.

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Cylinder Head and Valvetrain
4 Install intake camshaft oil baffle cover and cylinder head cov-
er:
= Checlc for correct seating of half-moon seals (A) in back of
cylinder head cover.
Use a small amount of Three Bond 1209
@or equivalent
sealant at corners
(B) of half-moon cutouts and corners in
front of cylinder head at joint to timing chain cover.
Align cover at front and rear, then alternatively tighten fas-
teners from inside to outside.
Tightening torque
Sparic plug to cylinder head 25 Nm (18 it-lb)
Ignition coils to cylinder head 10 Nrn (7.5 ft-lb)
Cylinder head cover to cylinder iiead 10 Nrn (89 in-lb)
fM6 screws)
CAMSHAFT AND LIFTER REMOVAL
AND ~NSTALLATION
The camshafts can be removed with the cylinder heads
mounted on the engine (in the car).
On 6-cylinder engines there are two different procedures giv-
en, depending on whether the engine is equipped with single
VANOS (M52 engine) or double VANOS
(M52TU or M54 en-
gine).
For V-8 engines, camshaft removal and installation proce-
dures are
only included for the non-VANOS (M62) engine.
Camshaft removal and installation for the
VANOS eq;ipped
V-8 (M62TU) is not covered in this manual.
Special BMW service tools should always be used to remove
and install the camshafts. Removal of the camshafts without
the special tools can result in cylinder head damage and cam-
shaft breakage.

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116-12
I Cylinder Head and Valvetrain
Camshaft and lifter removal and installation
(M52 engine)
Camshafts and lifters, removing (M52 engine)
WARNING
-
The process of evenly loosening the camshaft bearing cap
nuts is NOT an acceptable method of removing the cam-
shafts. Special tools should always be used to remove the
camshafts. Be sure to read the procedure
tlirough before
starting a job.
I Allow engine to cool before beginning this procedure. /
- Disconnect negative (-) cable from battery.
CAUTION-
Prior to disconnecting the batfew read the battery discon-
nection cautions given in
001 General Cautions and
Warnings.
- Remove VANOS control unit from cylinder head. See 117
Camshaft Timing Chain.
I I 4 Remove loosened bolts (arrows) from front of exhaust
sprocket
nuts
(arrows) from intake camshaft

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.
Cylinder Head and Valvetrain
< Remove cylinder head cover retaining studs (arrows) from
center and rear of cylinder head.
< Remove spark plugs and install BMW special tool 11 3 260
(A) and 11 3 270 (6) to cylinder head. Tighten tool retaining
bolts in spark plug bores. Do not overtighten bolts.
Tightening
torque
BMW special tool 11 3 260 I1 1 3 270 to 23 Nm (17 It-lb)
cylinder head
- Remove intake camshaft bearing cap for cylinder number 1.
CA UTIOG
Intake camshaft bearing cap 1 is centered with adapter
sleeves. To avoid
can~sllaft daniage, it must be removed bs-
fore any other caps.
Turn eccentric shaft on special tool until pressure is applied
to camshaft bearing caps.
- Remove remaining bearing cap mounting nuts
- Slowly release pressure on camshaft bearing caps by turning
eccentric shaft. Remove bearing caps and camshaft. Repeat
procedure on remaining camshaft.
CAUTION-
Camshaft bearing caps must be reinstalled in their original lo-
cations.
NOTE-
The camshaft bearing caps are coded with a letter anda
number. For example,
'XI" is the first exhaust camshaft
bearing cap at the front of the engine, and
"El "is the intalce
camshaft bearing cap at the front of the engine.
0 The camshafts are stamped with a code letter - "E" for the
intake side and 'MA" for the exhaust side.
0 "E is for Einlap, (German for intake) and 'XA"is for Auspuff,
(German for exhaust).

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/Cylinder Head and Valvetrain
Press down on secondary chain tensionerand loclc into place
using
BMW special tool 11 3 292, or a thin drift or pin.
4 Remove exhaust camshaft impulse wheel mounting nuts
(arrows). Remove impulse wheel (A).
< Remove spring plate (A).
4 Remove intake camshaft sprocket mounting nuts (arrows)
and remove spring plate (labelled
FRONT).

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Cylinder Head and Valvetrain
NOTE-
The camshaft bearing caps are coded with a letter and a
number. For example, "A
1" is the first exhaust camshaft
bearing cap
at the front of the engine, and "El "is the intake
camshaft bearing cap at the front of the engine.
-. -
The camshafts are stamped with a code letter - "E for the
intake side and
'X" for the exhaust side.
"E is for Einlap. (German for intake) and 'XA7s for Auspuff.
(German for exhaust).
- Repeat procedure for exhaust camshaft
< Secure hydraulic lifters in lifter bores using BMW special tool
11 3 250, or remove lifters using a magnetic pick-up tool.
I CAUTION-
Used liydraulic lifters must be reinstalled in original lifter
1 bores.
4 Remove lower camshaft bearing carriers from cylinder head.
CAUTION- Camshaft bearing carriers must be reinstalled in their original
locations
(E for intalce and A for exhaust).
NOTE- Do not allow hydraulic lifters to fall out of camshaft carriers.
Hydraulic lifters should be stored in an upright position.
Camshafts and lifters, installing (M52TU and M54 engine)
Lubricate camshafts, camshaft carriers, bearing caps, hy-
draulic lifters, friction washers, splined shafts and
spline hubs
with assembly
lubricant before installation.
CAUTION-
Make sure the crankshaft, which had been rotated approxi-
mately
30" opposite the direction of engine rotation from
TDC, is
stillin thatposition before lowering the camshafts into
position. Allpistons must be out of
TDCposition to prevent
valve/piston inteiference when the carnshafis are installed.
- Lift timing chain and place exhaust cam onto exhaust cam-
shaft carriers. Place
intake camshaft on camshaft carrier.

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~ ~. --
Cylinder Head and Valvetrain .-
4 While maintaining tension on timing chain, rotate crankshaft
at vibration dampener from
30" before TDC in direction of ro-
tation (clockwise) until number
1 cylinder is at TDC position
with line between the OIT mark (arrow) on front pulley
aligned with boss on lower timing chain cover.
4 Secure crankshaft in TDC position with BMW special tool
11 2 300 (arrow).
Slide impulse wheel on intake camshaft, aligning boss with
raised portion on camshaft (arrow).
Fit thrust spacer
(A) to intalte camshaft and tighten down with
threaded locating studs (arrows). Place longer threaded por-
tion of studs into camshaft.
Tightening torque
Impulse wheel studs to intake camshaft (M7)
20 Nm (15 ft-lb)