1999 BMW 540i Oul

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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
4 Secure hydraulic lifters in lifter bores using BMW special tool
11 3 250, or remove lifters using a magnetic pick-up tool.
4 Remove camshaft bearing carrier from cylinder head.
CA UTION-
Camshaftbearing carriers must be reinstalledin their original
/ locations (E for ir;fal NOTE-
Do not let hydraulic lifters fall out as the camshaft carrier is
removed.
Hydraulic lifters should be stored in an upright position.
Used hydraulic lifters
must be replaced into original lifter
bores.
Camshafts and lifters, installing
(M52 Engine)
Lubricate camshafts, camshaft carriers, bearing caps, hy-
draulic liflers, friction washers, splined shafts and spline hubs
with assembly lubricant before installation.
Make sure
the cranltshaft, which had been rotated approxi-
mately
30" opposite the direction of engine rotation from
TDC, is still in thatposition before lowering the
camshaffs into
position. All pistons must be out of TDC position to prevent
valve/piston interference when the camshalts are installed.
Before installing camshaft carriers, examine bearing bores
(arrows) on hydraulic lifter bores for signs of wear.

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..--.
I Cylinder Head and Valvetrain - I
4 Lift primary chain and hold under tension, rotate engine
against direction of rotation (counterclockwise) approximate-
ly 30".
To prevent damaging valves while
worlcing on camshafts, no
aistons should be in the TDC position.
- Remove BMW special tool set 1 I 3 240 from rear of cylinder
head.
Remove retaining nuts (arrows) and bearing cap
1 of intake
camshaft.
Intake camshaft bearing cap
1 is centered with adapter
sleeves. To avoid camshaft damage, it must be removed be-
fore anv other caos.
4 Fit BMW special tools 11 3 260 (A) and 11 3 270 (B) to cylin-
der head and screw long bolts (aiiows) into spark plug
threads. Tensioners will align with the bearing caps on the in-
take camshaft.
CA UTION--
Do not over torque bolts into spark plug holes. 1
4 Turn eccentric shaft of special tool to pretension intake carn-
shaft bearing caps. Remove nuts on remaining bearing caps.
- Slowly release tension on eccentric shaft and remove BMW
special tools. Remove bearing caps and set aside in order.
Remove camshaft and store safely.
CA U TIOW-
Camshaft bearing caps must be installed in their original lo-
cations.

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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 valvetrain1
Camshaft removal and installation
(M62 engine)
Camshafts, removing (M62 engine)
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 personal injury and lor cylinder
head damage.
NOTE-
Cylinder bank 1-4 is referred to as the right cylinder bank
and is located on the passenger side. Cylinder bank 5-8 is
referred to as the left cylinder bank and is located on the driv-
er's side.
WARNING-
Allow enqine to cool before beqinninq this procedure. 1
- Disconnect negative (-) cable from battery.
CAUTION-
Prior to disconnecting the battery, read the battery discon-
nection cautions
in 001 General Cautions and Warnings.
- Dra~n coolant. See 170 Radiator and Cooling System.
Remove plastic engine covers:
Press down on locking pins (arrows) and remove top
cover.
Pry out
trlm caps (A) from covers.
Remove fasteners from beneath
trlm caps and remove
side covers.
4 Remove left and right interior ventilation filter housing (lefl
side shown):
Release locking tabs
(A) or locking strap (early models,
not shown).
Rotate duct inward (arrow) to disconnect.
- Release spring lock (6) to unloclc ventilation housing.
Disconnect electrical harness from hood switch
(C).
Release locking clip and remove ventilation filter cover (0).
Remove filter housing.
Removal of right side ventilation duct is similar.

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11 6-42
/ Cvlinder Head and Valvetrain
4 Using crankshaft center bolt, rotate engine clockwise one
complete rotation until the first cylinder is at TDC.
4 Confirm TDC position. Lobes of camshafts for cylinder head
1-4 (passengers side) should point up (arrows).
4 Remove timing chain tensioner (arrow) from right side upper
timing chain cover.
- Remove secondary air injection pipes in front of upper timing
chain covers.
- Remove left and right coolant hoses from coolant pump
housing.
- Detach dipsticlc tube from upper right timing cover,

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1 16-56
Cylinder Head and Valvetrain
This section covers valve removal and reconditioning, includ-
ing valve guides, seats, springs, and valve stem oil seals.
Valves, leak test
To test the valves for leakage, the cylinder head must be dis-
assembled with camshafts and camshaft carriers removed.
With valve assemblies and spark plugs installed, place the
cylinder head on a workbench with the combustion chamber
facing upward. Fill each combustion chamber with a thin non-
flammable liquid. After fifteen minutes,
check the level of the
fluid. If the fluid level in any cylinder drops, that cylinder is not
sealing properly.
Valves, removing and installing
- Remove cylinder head as described in 113 Cylinder Head
Removal and Installation.
CAUTIOI\C
(M52 TU/M54 engines only) Do not let the hydraulic lifters
fall out as the camshaft carrier is removed. Special suction
cups are available from
BMW to hold the hydraulic lifters in
place during carrier removal.
* Hydraulic cam lifters should be stored m an uprfght po-
sition. If necessary, use a magnetic tool to
aidin remov-
al of the lifters.
- Remove valves using a valve spring compressor.
CAUTIOI\C
Label each valve assembly as it is removed so it can be in-
stalled in its original position.
-
- Remove and discard valve stem oil seals from valve guides.
See Valve stem oil seals later in this section.
- Valve installation is reverse of removal. Remove carbon de- - -
posits from the valves using a wire brush or wire wheel. -
-
Valve specifications are listed in Table c. Valve specifica-
tions.