1997 BMW 528i Tightening torque

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020-22 Maintenance
1
- Installation is reverse of removal, bearing in mind the
following:
Lightly lubricate new
spark plug threads with
copper-based anti-seize compound.
Thread plugs into cylinder head by hand to prevent
cross-threading.
. Be sure to reinstall and tighten coil grounds.
Tightening torque Spark plug
to cylinder head 25 Nm (18 It-lb)
Interior ventilation microfilter, replacing
Two interior ventilation microfilters are used, one on each
side of the engine compartment at the fire wall.
< To replace the microfilter, unclip the wire fastener and
remove the cover.
Lift out the filter, and replace. Left side shown; right is
similar.
Replace cover and clip wire fastener to retain cover.
Battery, checking, cleaning, and replacing
The battery Is located in the right side of the luggage compart-
ment. Simple maintenance of the battery and its terminal
connections will ensure maximum starting periormance,
especially in winter when colder temperatures reduce battery
power.
Battery cables should be tight. The terminals, cable clamps
and battery case should be free of the white deposits that
indicate corrosion and acid salts. Even a thin layer of dust
containing conductive acid salts can cause battery discharge.

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020-26
Maintenance
NOTE-
The parking brake may lose some of its effectiveness if it is
not used frequently This is due to corrosion build-up on the
parking brake drum. To remove corrosion, apply the parking
brake just until it begins to grip, then pull the lever up one
more stop (click). Drive the car approximately 400 meters
(1,300
ft.) and release the brake. To recheck the adjustment
of the parking brake see
340 Brakes.
Clutch fluid, checking
In cars equipped with manual transmission and clutch, the hy-
draulic clutch and the brake system share the same reservoir
and the same bralte fluid. Clutch fluid level and brake fluid lev-
el are checked at the same time.
NOTE-
* See 340 Brakes for more information.
See
210 Clutch for information on the clutch and the
hydraulic clutch operating system.
Differential oil level, checking
The E39 differential is filled with lifetime oil that ordinarily
does not need to be changed.
BMW recommends using only
a specially formulated synthetic gear oil
(SAF-XO) that is
available through an authorized
BM\N dealer parts depart-
ment. For additional information on this lubricant and any
other lubricants that may be compatible, contact an
authorized
BMW dealer service department.
< Check rear differential oil level at filler plug (arrow).
- Check lubricant level with car on a level surface:
Level is correct when fluid just reaches edge of filler hole.
If necessary, top up fluid.
Replace filler plug sealing ring.
Install and tighten oil filler plug when oil level is correct.
NOTE-
Use either a 14 mm or 17 mm Allen socket to remove the
drain plug.
If the car is raised in the air, it should be level when
checking or filling final drive fluid level.
Tightening torque
Filler plug to final drive housing 70 Nrn (52 it-lb)

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110-15
Engine Removal and lnstallation
- Installation is reverse of removal, noting the following:
Replace all gaskets. O-rings and seals.
Use new fuel injector seals
Check that engine drive belts properly engage pulley
grooves.
Inspect O-ring seal between mass air flow sensor and air
filter housing. To facilitate reassembly, coat seal with acid-
free grease.
Change engine oil and filter and
check all other fluid levels.
See
020 Maintenance.
Refill and bleed cooling system. See
170 Radiator and
Cooling System.
CAUTION--
When reattaching throttle assembly harness connectoc con-
nector is
fuNy tightened when arrows on connector and plug
line up.
Tightening torques
Coolant drain plug to cylinder block
25 Nm (18 ft-lb)
Engine mount to
subframe (M10) 45 Nm (33 ft-ib)
Exhaust manifold to cylinder head
M6 10 Nm (89 in-lb)
M7 or ME 20 Nm (15 ft-lb)
Intake manifold to cylinder head
M7 15 Nm (I 1 ft-lb)
ME 22 Nm (16 ft-lb)
Radiator cooling fan to coolant pump
40 Nm (30 ft-lb)
Radiator drain screw to radiator
2.5 Nm (22 in-lb)

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- .. -.
-. Engine Removal and in=/
4 Remove left interior ventilation duct:
Release duct locking tabs (A). Early models: release
loclc
ing strap.
* Rotate duct inward (arrow) to detach.
Release spring
loclc (El) to unlock ventilation housing.
Disconnect electrical harness connector from hood switch
(C).
Release locking clip and remove ventilation filter cover (D).
Slide air housing away from inner fender to remove.
Removal
of right side ventilation duct is similar.
4 Remove rear engine compartment bulkhead panel:
Remove rubber sealing strip.
* Remove 3 mounting clips (A).
Remove harness supporting clip
(El).
Unlock panel retainers (arrows).
Lifl out panel.
< Separate engine wiring harness (arrow) from electrical box
at right side of engine compartment:
Remove E-box cover.
Disconnect electrical harness connectors leading from en-
gine wiring harness (arrow). Connectors are labelled (A,
El, C. D, E) for locating purposes.
Lay engine harness on top of engine.
- Drain engine coolant from engine block and radiator. See 170
Radiator and Cooling System.
Remove drain plugs from right and left side of engine
bloclc
(between cylinders 213 and 617).
Afler coolant has drained, reinstall drain plugs using new
sealing washers.
Drain radiator and reinstall drain plug.
Tightening
torques
Coolant drain plug to cylinder block (M14) 25 Nm (18 ft-ib)
Radiator drain screw to radiator 2.5
Nm (22 in-lb)

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Engine Removal and Installation
Tightening torques
ATF cooler lines to radiator
(use new O-rings)
MI8 cap nut 20 Nm (15 ft-lb)
M22 cap nut
22
Nm (17 ft-lb
Coolant drain plug to cylinder
blocic (M14) 25 Nm (18 ft-lb)
Engine mount to engine bracket or 47 Nm (35 ft-lb)
subframe (M10)
Exhaust flange nuts (8 mm) 25 Nm (18 ff-ib)
Radiator cooling fan to coolant pump 40 Nm (30 ft-lb)
(left-hand threads)
Radiator drain screw to radiator 2.5 Nm (22 in-lb)
Wirino to alternator
(ME nut) 13 Nm (9.5 ft-lb)

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. .- . --
Lr -- - - - -- Cylinder Head Removal and Installation I -
- Release pressure at compression gauge valve, then remove
gauge from spark plug hole. Repeat test for each cylinder
and compare results with values given in Table a.
Table a. Compression testing specifications
Minimum compression
6-cylinder
10-1 1 bar (142-156 psi)
V-8 12-14 bar (174-203 psi)
Maximum difference between
cylinders (all engines)
0.5 bar (7 psi)
- Compression readings may be interpreted as follows:
Low compression indicates a poorly sealed combustion
chamber.
0 Relatively even pressures that are below specification nor-
mally indicate worn piston rings
andlor cylinder walls.
Erratic values tend to indicate valve leakage.
Dramatic differences between cylinders are often a sign of
a failed head
gasket, burned valve, or broken piston ring.
- If readings are within specifications, reinstall spark plugs and
ignition coils.
NOTE-
Used spark plugs should be reinstalled in the same cylinder
from which they were removed.
Tightening torque Spark plug to cylinder head 25 Nm
(18 ft-lb)
lanition coils to cylinder head 10 Nm (7.5 ft-lb)
- Remainder of installation is reverse of removal. Be sure to re-
install all wires disconnected during test, especially ground
wires at coils and cylinder head cover (where applicable).
Wet compression test
To further help analyze the source of poorcompression,awet
compression test is the next step.
- Repeat compression test, this time squirt a teaspoon of oil
into each cylinder. The oil will temporarily help seal between
piston rings and cylinder wall, practically eliminating leakage
past rings for a short time.
- If this test yields a higher reading than "dry" compression
test, there is probably leakage between piston rings and
cylinder walls, due either to wear or to broken piston rings.
- Little or no change in compression reading indicates other
leakage, probably from valves.

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I Cylinder Head Removal and Installation
4 Check that two locating dowels are correctly positioned in
block and are not damaged.
- Apply permanently elastic sealing compound Three Bond
1209 8 to joints where cylinder block joins timing case cover.
- Place new cylinder head gasket on cylinder block.
NOTE-
The word "OBEN" or 'TOP': printed on the gasket, should
face up. The cylinder head
gasket will fit correctly in only one
orientation.
- With camshafts locked in TDC oosition with BMW soecial
tools as described during cylinder head removal,
seicylinder
head in position, guiding primary chain through cylinder head
opening.
NOTE-
* The camshafts must be locl(ed in the TDC position at the
rear of the cylinder head with
BMW special tool I1 3 240
before installing the cylinder head.
Make sure the
cranksha% which had been rotated approx-
imately
30" opposite the direction of engine rotation, is still
in that position before lowering the cylinder head into posi-
tion.
- Lightly lubricate new cylinder head bolts. Loosely install bolts
and their washers, then thread them in until they are finger
tight.
NOTE-
. Torx-type cylinder head bolts should not be reused. They
are stretch-type bolts and must always be replaced when-
ever loosened.
Check that all washers for the cylinder head bolts are in
place before installing the bolts. Some of the washers may
be
stalced to the cylinder head.
CAUTIOI\C
Cylinder head bolts for a cast iron engine block are different
length and require different tightening torque than bolts for an
aluminum cylinder bloclc engines
(95 rnm versus 110 rnm
bolts).
- Install cylinder head-to-lower timing chain cover bolts finger
tight.
< Tighten cylinder head bolts in correct sequence to initial
torque value.

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I Cylinder Head Removal and Installation I
< Use BMW tool 11 2 110 or torque angle gauge to tighten cyl-
inder head bolts in sequence to stage
2 and 3.
Tightening torques
Cylinder head to cast iron
bloclc
Staoe 1
staie 2
Stage 3
Cyllnder head to aiumlnum block
Stage
1 40 Nm (30 it-lb)
Stage 2 +90°
Staoe 3 -80"
- Tighten cylinder head-to-lower timing chain cover bolts.
Tightening torques
cylinderhead to lower timing chain cover 10 Nm (89 in-lb)
- Inspect secondary chain guide rail and tensioner rail for
grooves caused by chain contact. Replace any part that is
worn.
NOTE-
Inspect timing chain sprocl(ets. Sprockets that have worn
or missing teeth should be replaced.
* If any of the sprockets are being replaced due to wear, the
chain should also be replaced.
If the crankshaft sproclet requir?s replacement, the oil
pump drive sprocket and chain must be removed as de-
scribed under
119 Lubrication System.
The procedure outlined below assumes that the camshafts
and the
cranl(shaft are locledin the TDCposition with special
4 Mount primary timing chain sprocltet to primary chain so that
arrow on sprocket faces up. Mount sprocket to camshaft so
that tapped holes in camshaft are on left side of elongated
holes in sprocltet
Install BMW special tool
1 I 4 220 into primary timing chain
tensioner sleeve. Thread center spindle in finger tight
until
slack is removed from chain.