2000 BMW 540i spark plug

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Cylinder Head Removal and Installation
4 If applicable, remove secondary air injection pump:
Disconnect hose at one-way valve
(A).
Remove bolts at support bracket on strut tower (arrows).
Disconnect electrical harness from bottom of secondary
air injection pump.
Remove mounting bracket from strut tower.
4 Remove ignition coils:
* Disconnect ignition coil harness connectors.
Remove coil mounting fasteners.
Remove coils.
* Remove ground straps.
CA UTIOI\C
Note location of all ground wires. Failure to reinstall grounds
can result in permanent damage to engine control module or
ignition system components.
Set coil harness to side of engine compartment
- Remove cylinder head cover mounting fasteners and remove
cylinder head cover.
NOTE-
The cylinder head cover mounting bolt insulators and gas-
ltets should be reinstalled in their original locations. Male
note of their arrangement during removal.
- Remove spark plugs
4 Remove oil baffle cover from above intake camshaft.

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Cylinder Head Removal and Installation I
Remove cylinder head cover mounting studs (arrows) from
center of cylinder head.
- Remove crankshaft loclting tool from transmission bell hous-
Ing.
Lift primary chain and hold under tension, then rotate engine
at vibration damper in opposite direction of normal rotation
(counterclocltwise) approximately 30".
CAUTION-
By turning crankshait3O0, pistons are movedaway from top
dead center, to prevent possible valve interference to pistons
during camshaft servicing.
- Remove camshaft loclting tools (BMW special tool set 11 3
240) from rear of cylinder head.
4 Remove camshaft bearing cap 1 on intake camshaft.
4 Fit BMW special tools 11 3 260 (A) and 11 3 270 (B) to cyl-
inder head and screw long bolts (arrows) into spark plug
threads. Tensioning pins on tool will align with the bearing
caps on the
intake camshaft.
CAUJION-
Do not over torque bolts into sparkplug holes.

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.-
Cylinder Head Removal and Installation
4 Rotate camshafts until intake and exhaust lobes for cylinder
1 face each other (arrows).
CAUTION-
Be sure that cranlcshaft is stillpositioned at least 30" away
from
TDC.
- Place bearing caps on cams, but do not install retaining nuts.
4 Fit BMW special tool 11 3 260 (A) and 11 3 270 (B) to cylin-
der head over intake camshaft and screw long bolts (arrows)
into spark plug threads.
CAUTIOI\C
Do not overtighten bolts in spark plug holes.
Turn eccentric shaft of special tool to pretension
bearing
caps. Install and torque nuts on intake camshaft bearing
caps.
Tightening torque Camshaft bearing
cap to cylinder head (M7) 14 Nm (10 ft-lb)
Release tension on eccentric
shaft and remove BMW special
tools
11 3 2601270.
Repeat procedure for exhaust camshaft.
CAUTION-
After the camshafts are installed, a minimum waiting time is
required for the hydraulic lifters to 'bleed down" before bring-
ing the crankshaft andpiston back to top
deadcenter. When
the camshafts are removed, the hydraulic lifters can expand.
This expansion can cause increased valve lift when the cam-
shafts are bolted down, possibly resulting in piston interfer-
ence.
Crankshaft
I valve timing waiting times
68.F (20°C) and higher 4 minutes
50-68"F(10-20°C) 11 minutes
32-5O0F(O-10°C) 30 minutes

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11 3-56
I Cvlinder Head Removal and Installation
- Installation of the remaining parts is reverse or removal, not-
ing the following:
- Refill cooling system as described in 170 Radiator and
Cooling System.
Change engine oil and filter as described in
020 Mainte-
nance.
If necessary, adjust accelerator cable.
a Reconnect battery.
CAUTION- To prevent damaging the engine electronic systems, installall
ground wire previously removed, including the ground wires
for the
ionition coils.
Tightening torque Coolant drain
pluq to cylinder bloclc 25 Nm (1 8 ft-lb)
Radiator cooling fan to coolant pump 40 Nm (30 ft-lb) -
Radiator drain screw to radiator 2.5
Nm (22 in-lb)
spark plug to cylinder head 25
Nm (1 8 ft-lb)
CYLINDER MEAD REMOVAL AND
INSTALLATION (M62 ENGINE)
This procedure covers cylinder head removal and installation
for the
M62 V-8 engine. Procedures forthe M62 TU VANOS
engine are not covered in this manual.
Intake manifold, left cylinder head, and right cylinder head re-
moval and installation are written as separate procedures.
The intake manifold must be removed before the cylinder
heads can be removed.
WARNING
-
Due to risk of personal injuv be sure the engine is cold be-
fore beginning the removal procedure.
Cylinder head removal and installation requires multiple spe-
cial service tools. Read the entire procedure before beginning
the repair.
Intake manifold, removal and installation,
M62 engine
- Disconnect negative (-) battery cable.
CAUTION- Prior to disconnecting the
batterj read the baitery discon-
nection cautions
in 001 General Cautions and Warnings.

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11 3-61
Cylinder Head Removal and installation I
Remove intake manifold fasteners (A).
Carefully lift intake manifold off engine while checking that all
hoses and harnesses have been disconnected.
Left cylinder head, removing, M62 engine
- Remove intake manifold as described earlier
- Remove left side exhaust manifold. See 180 Exhaust Sys-
tem.
- Drain engine coolant, then remove viscous clutch cooling
fan. See
170 Radiator and Cooling System.
WARNING -
Use extreme caution when draining and disposfng of eng~ne
coolant. Coolant is poisonous and lethal to humans andpets.
Pets are attracted to coolant because of its sweet smell and
taste.
Seek med~cal attention immediately if coolant is ingest-
ed.
4 Remove coolant manifold mounting fasteners and carefully
remove manifold.
NOTE-
Engine shown removed from engine bay
4 Remove ignition coil fasteners and coils (noting location of
ground strap).
- Remove spark plugs.

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/Cylinder Head Removal and Installation
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Use new gaskets when mounting intake
manifold. Tighten
nuts finger tight first, then torque to specification in stages
working diagonally from center out.
Be sure to reinstall ignition coil ground straps at cylinders
no.
3 and no. 7. See 120 Ignition System.
Reinstall cooling fan and shroud. See
170 Radiator and
Cooling System.
Refill and bleed cooling system as described in
170 Radi-
ator and Cooling System.
Change engine oil and filter as described in
020 Mainte-
nance.
CA UTIOG
To prevent damaging engine electricalsystems, be sure to in-
stall all ground wires previously removed.
Tightening torques
Camshaft sprocket to camshaft 15
Nm (11 H-lb)
Coolant manifold to cylinder head 10 Nm (7.5 H-lb)
Cylinder head cover nuts 10 Nm (7.5 ft-lb)
Exhaust manifold to head 22 Nm (17 ft-lb)
Engine mounts to subirame 42 Nm (30 ft-lb)
Spark plugs to cylinder head 22 Nm (17 ft-lb)
Right cylinder head, removing, M62 engine
- Remove left side exhaust manifold. See 180 Exhaust Sys-
tem.
- Remove intake manifold. See Intake manifold, removal
and installation,
M62 engine.
- Drain engine coolant. See 170 Radiator and Cooling Sys-
tem.
WARNING-
Use extreme caution when draining and disposing of engine
coolant.
Coolanl is poisonous andlellial lo liumans andpels.
Pets are
altracled to coolant because of 11s sfieet smell and
fasle. Seelc medcal anenfion immed~alely if coolant is ingesl-
. .-
< Remove engine coolant manlold mo~nlng fasreners and
carei~lly remove manifo d.
. I
NOTE
Engine 8s slioivn removed lor clarify

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1 13-82
1 Cylinder Head Removal and Installation
4 Reinstall cylinder head covers to right and left cylinder heads
using new gaskets.
Check for correct seating of half-moon seals
(A) in back of
cylinder head cover.
Use a small amount of Three Bond
1209 8 or equivalent
sealer at corners
(B) of half-moon cutouts.
- Install cylinder head cover fasteners and tighten uniformly in
'I2 turn steps.
Tightening torque Cvlinder head cover fasteners
10 Nm (7.5 It-lb)
- Install exhaust manifolds using new gaskets and fasteners.
See
180 Exhaust System.
- Refill and bleed cooling system as described in 170 Radiator
and Cooling System.
- Change engine oil and filter as described in 020 Mainte.
nance.
CA UTIOW-
To prevent damaging engine electricalsystems, be sure to in-
stall all ground wires previously removed.
Tightening
tOrqUeS
Camshaft sprocket to camshaft 15 Nm (1 1 ft-lb)
Coolant manifold to cylinder head lo Nm (7.5 It-lb)
Cylinder head cover nuts 10 Nm (7.5 ft-lb)
Exhaust manifold to head 22 Nm (17 ft-lb)
Engine mount to subframe 42 Nm (30 ft-lb)
Spark plugs to cylinder head 22 Nm (17 ft-lb)

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11 6-6
Cylinder Head and Valvetrain
4 Before machining the head to correct for warpage, measure
the total height
(A) (thickness of the cylinder head). Minimum
height specifications are given in Table a. Cylinder head
height.
NOTE-
6 cylinder and V-8 engines share cylinder head height spec-
ifications.
Table a. Cylinder head height
New Minimum height
(A)
140.0 rnrn (5.512 in.) 139.7 rnrn (5.500 in.)
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.
Camshaft wear
Camshaft wear is usually caused by insufficient lubrication.
Visually inspect camshaft lobes and journals for wear. Cam-
. ~~ shaft wear specifications are given in Table b. Camshaft
wear specifications.
CA UTIOI\C
If the camshaft is being replaced due to cam lobe wear, it is
recommended that the corresponding lifters should also be
replaced to avoid damaging the new camshaft
Table b. Camshaft wear specifications
6 cylinder engines V-8 engines
Axlal play 0.150-0.330 rnrn 0 200-0 360 rnrn - .-
(0.0060-0 013 in.) (0.008 - 0.014 in ) - - Radlal play 0.020-0.054 rnrn 0.040-0.074 rnrn
(0.0008-0.0021 in.) (0.016 - 0.029 in.)