Table of Contents

Subject Page

M Engines - S54B32 2

Objectives of The Module 2

Purpose of The System 3

Technical Data 4

Components

Engine Block.5

Crankshaft and Bearings .5

Connecting Rods and Bearings .7

Pistons and Rings .8

Oil Circuit Flow.9

Oil Pump.10

Crankcase Ventilation.11

Cylinder Head.12

Coolant Circuit Flow.13

Camshafts.14

Valve Train.16

VANOS.19

Intake Air System.25

Fuel Supply.26

Ignition Coils.26

Clutch.27

Exhaust System.27

Review Questions 28

M ENGINES

Model: E46 M3, E46 M3 Convertible, M roadster, M coupe
Engine: S54B32

Production Date: 2001 MY to Present

Objectives of The Module

After Completing this module, you will be able to:

Perform a valve adjustment.

Identify camshaft markings and correct "timing”.

Explain the VAN05 operation.

Identify piston markings for correct installation.

Explain the oil flow circuit.

Understand the oil pump operation.

Identify the crankcase ventilation components.

Explain the coolant circuit flow.

Distinguish the differences between the intake and exhaust valves.
Identify the intake air system components.

Identify the S54 fuel injectors and ignition coils.

2

M Engines - S54B32

S54B32 Engine

Purpose of The System

The 554B32 engine is an in-line 6 cylinder power plant. This 3246 ccm displacement eng¬
ine is used worldwide. The engine designation is:

S 54 B 32

Sport Engine Engine Designation Gasoline Powered Displacement in Liters

din^

The 554 engine design provides:

m

Everyday Driveability

5.

Economic Operation

2.

Reduction in Weight of Engine Components

6.

Increased Output (to previous M3)

3.

Environmental Comparability

7.

High Performance

■

Greater Speed Range

8.

EDR (Electronic Throttle)

The S54B32 is a 4-valve per cylinder dual VANOS naturally aspirated engine with high
torque and high-rev concepts. High torque is developed by a large volume engine at low
engine rpm and a long total gear ratio. High-rev is achieved with a small displacement
"lightweight” (internal components) engine and short total gear ratio. This powertrain pro¬
vides the best of both worlds by using a 3.2 Liter in-line 6 cylinder configuration coupled to
a 6 speed manual transmission.

Power Output for the E46 M3:

1. 333 hp at 7900 rpm

2. 355 Nm of Torque at 4900 rpm

Power Output for the
M roadster and M coupe:

1. 315 hp at 7900 rpm

2. 340 Nm of Torque at 4900 rpm

114100001 .jpg

3

M Engines - S54B32

Technical Data

Engine Management

MS S54

Effective Displacement (CCM) Design / Valve Per Cylinder

3246 in-line 6/4

Bore / Stroke (mm)

87/91

Maximum Engine RPM

8000

Power Output (bhp/rpm) M3 / M roadster - M coup?

333 / 315 bhp @ 7900 rpm

Weight-to-Power Ratio (DIN) kg per KW-kg per bhp

5.93kg/kw-4.36kg / bhp

US Torque (Nm/rpm) M3 / M roadster - M coupe

355 / 340 Nm @ 4900 rpm

Compression Ratio

11.5 :1

Fuel

Premium Unleaded

Valve Diameter

Intake / Exhaust (mm)

35 / 30.5

Stem - Intake / Exhaust (mm)

6.0 / 6.0

Valve Lift

Intake / Exhaust (mm)

12/ 12

Valve Clearance (Adjustment < 35- C Engine Temperature)

Intake (mm)

0.18 - 0.23

Exhaust (mm)

0.28 - 0.33

Camshaft Spread Angle

Intake (degrees)

70 - 130

Exhaust (degrees)

83 - 128

US Emission Compliance

LEV

M3

Hp

Shown

M3

Torque

Shown

4

M Engines - S54B32

System Components

Engine Block: The 554 engine block is cast iron in order to absorb the high forces pro¬
duced by the crankshaft (combustion pressure and high engine rpm).

The engine block has cast provi¬
sions for 3 Knock Sensors and
and the Crankshaft Position/RPM
Sensor (on the intake side).

The cylinder bores are 87 mm in
diameter and are spaced 91 mm
on center.

The "bare” block weighs approxi¬
mately 105 lbs. (48 kg).

11410004.jpg

Crankshaft and Bearings: The S54 crankshaft is forged steel with 12 counterweights
and a 91 mm stroke. The crankshaft is supported by 7 (60 mm diameter) main bearings
with 49 mm diameter connecting rod journals.

The "thrust" bearing is a multi¬
piece shell assembled as a unit
and is located on the number 6
main journal of the crankshaft.

Bearing Clearance:

1. Main 0.02 - 0.05 mm

2. Thrust (end play) 0.08 - 0.16 mm

11410005 .jpg

The impulse wheel is bolted to the number 6 connecting rod journal counterweight.

5

M Engines - S54B32

The S54 impulse wheel is bolted directly to the crank¬
shaft providing accurate:

1 .

Crankshaft Position - Reference

2.

Engine RPM

3.

Smooth Running Measurement

4.

Misfire Detection

IncrW'-crvLal

Wheel

11410006.bmp

The Crankshaft Position/RP M Sensor is mount¬
ed on the rear of the engine block (below the
intake manifold).

The sensor protrudes through the engine block
(arrow) to scan the impulse wheel gear teeth.

The cast sensor mounting is shown from the
rear view of the engine.

11410007.jpg

The torsional vibration damper is specifically
designed for the higher engine rpm.

The damper is secured by 4 bolts which must
be angle torqued (refer to Repair Instructions
and Technical Data).

Note the installation location for the crankshaft
position locating tool (arrow).

11410008.jpg

6

M Engines - S54B32

Connecting Rods and Bearings: The 554 uses reinforced forged steel "cracked"
connecting rods:

1. Length = 139 mm

2. Small End (Integrated Bushing)
Diameter = 21 mm

3. Large End Diameter = 49 mm

11410009.jpg

The "cracked" connecting rod refers to the cap which
is split off leaving rough surfaces on both the cap and
the rod.

Centering of the cap on the rod is carried out through
the structure of the split which eliminates the alignment
sleeves. Pairing codes are stamped into the rod to
ensure proper installation of the cap.

The S54 connecting rods are weight-optimized (+/- 4
grams). Only one set of connecting rods (the same
weight class) is available to maintain balance.

J i ■

HH.ry.

The connecting rod bolts must be angle torqued (refer ii4ioooo.bmp
to Repair Instructions and Technical Data). The bolts
can not be replaced separately, if damaged; the con¬
necting rod must be replaced (supplied with new
bolts).

The 554 connecting rod bearings use end mounted
locating tabs.

Notes:

11410010.bmp

7

M Engines - S54B32

Pistons and Piston Rings: The S54 uses graphite
coated cast aluminum (full slipper skirt) pistons with
valve recesses.

The piston diameter is 86.965 mm, weighs approxi¬
mately 470 grams with a compression ratio of 11.5:1.

Install the pistons with the arrow pointing towards the
front of the engine.

Piston Rings:

1. Compression Ring 1 = 1.2 mm Height

2. Compression Ring 2 = Stepped Face 1.5 mm Height

3. Oil Control Ring = Beveled, Spring Loaded 2 mm Height

A Special Tool (ring compressor) is required to install
the pistons.

11410065.eps

The pistons are cooled by oil spray nozzles that are
bolted into the crankcase.

The nozzles are "tapped" into the main oil gallery and
delivers a constant oil spray to the underside of the pis¬
tons.

The wrist pins are 21 mm in diameter and have tapered
ends (inside diameter) for weight reduction.

8

M Engines - S54B32

11410066.eps

Oil Circuit Flow

1. Oil Pump Intake (rear of pan) 17. Thermal Oil Level Sensor

la. Oil Pump Intake (front of Pan) 18. Oil Pressure Switch

Supply to Block

Oil Return Flow Line

3. Supply to Oil Filter/Cooler 20. Oil Pump (two stage)

4. Oil Cooler (flow controlled by 95m- C thermostat in oil filter housing)

5. Filtered Oil Return to Main Gallery

6. Main Oil Gallery (crankshaft, connecting rods, spray nozzles)

7. Spray Nozzles for Pistons

8. Oil Pressure Control (back to valve in Pump)

9. Supply to Cylinder Head

10. Supply to VANOS Pressure Reducer Valve

11. Supply to Timing Chain Tensioner

12. Exhaust Camshaft Bearings

13. Intake Camshaft Bearings

14. Exhaust Valve Finger with Oil Collector Hole

15. Intake Valve Finger with Oil Collector Hole

16. Oil Filter Housing

11410012.tiff

The recommended oil for the S54 is CASTROL TWS MOTORSPORT SAE 10W-60 or
CASTROL FORMULA RS 10W-60 SYNTHETIC OIL - PN 07 51 0 009 420 (refer to SIB
#00 02 00 and 11 06 01). Oil Capacity: Refer to Technical Data or the Oil Capacity
Chart found in the Service Information Bulletin.

9

M Engines - S54B32

Oil Pump: The 554 oil pump is two stage, supply and scavenge. The pump is driven by
the crankshaft with a single row chain.

The oil pump has two separate chambers, the scavenge chamber (1) draws oil from the
pickup at the front of the oil pan. The oil is transferred from the pump through a small pipe
to the main sump at the rear of the oil pan (2).

The supply chamber (3) draws oil from the main sump through a large pipe (4) to supply oil
to the main gallery. The main gallery circuit returns to the pump housing which contains the
oil pressure control piston.

3

The oil pressure is tested at the oil filter housing using
the Special Tool #90 88 6 114 390 (adapting retainer
bolt and pressure gauge as shown in the Repair
Instructions).

The adapter retainer bolt replaces the oil filter housing
cover retaining bolt and provides an adapter fitting for
the oil pressure gauge.

10

M Engines - S54B32

Crankcase Ventilation: The S54 features a non-pressurized sealed crankcase ventilation
system for the blow-by vapors.

1. Intake Manifold

2. Oil Pan

3. Oil Separator (Labyrinth)

4. Cylinder Head Cover

5. Drainback Tube

6. Crankcase Vapor Inlet

7. Crankcase Vapor Outlet
(To Intake Manifold)

8. Condensate Return to Oil Pan
(With C heck Valve)

9. Condensate Return To Oil Pan

11410013 .jpg

The crankcase blow-by vapors are "purged" by intake manifold vacuum. The vapors are
drawn from the cylinder head cover (4) through the inlet of the Oil Separator (6). The
Labyrinth (3) separates the oil from the vapors, and the condensate (oil) returns to the oil
pan through the return line (9). The vapors exit the Oil Separatorthrough the outlet hose (7)
to the intake manifold to be inducted into the combustion chambers.

When the engine is running, intake manifold vacuum will close the Check Valve in the return
line (8). When the engine is not running, the Check Valve will open. This allows any con¬
densation (oil) that have collected in the intake manifold to drain back to the oil pan through
the dipstick tube.

Sealing Washers Port Seals

The cylinder head cover is sealed by a perime-
terseal, spark plug port seals and sealing wash¬
ers under the retaining bolts.

These individual seals must all be properly
installed to prevent oil and vacuum leaks.

11410016.tiff

11

M Engines - S54B32

Cylinder Head: The S54 features an aluminum cross-flow cylinder head designed as a sin
gle component that houses the camshafts and valve train.

11410018.tiff

11410015 jpg

The combustion chamber reveals the 4 valve per cylinder arrangement and the optimized
(flow enhanced) intake and exhaust ports. The spark plugs are centrally located in the com¬
bustion area for the most effective power and reduced emission outputs.

To remove the cylinder head, the camshafts must first be removed to access the cylinder
head bolts (refer to the Repair Instructions). The timing chain guide rail bolt must also be
removed (upper picture #1) and the special sealing washer must be replaced.

To pressure test the cylinder head, a Special Tool (Pressure Tester Adapter Kit) is required.

Cylinder head machining is not permitted.

12

M Engines - S54B32

E^H

Coolant Reservoir (2 bar system)

Thermostat Housing (80-C thermostat)

Heater Core

Water Pump

Coolant Temperature Sensor

6,7,8

Coolant Outlet (from cross-flow cylinder head)

Coolant Return Pipe

10.

Radiator

11.

Coolant Return Line (from heater core)

The S54 uses a high efficiency water pump (4) to enhance the Cross Flow cylinder head
design.

The cross-flow design ensures even temperature distribution through out the cylinder head.
The coolant flows from the engine block on the exhaust side into the cylinder head.

The coolant flows through (across) the cylinder head and exits at the intake side through
three outlets (6,7,8). The coolant is routed through the Return Pipe (9) to the thermostat
housing (2).

13

M Engines - S54B32

Camshaft Drive: The camshafts are driven by the
crankshaft using a double-roller timing chain.

1 .

Crankshaft Sprocket

2.

Aluminum Guide Rail

3.

Intake Camshaft Sprocket

4.

Exhaust Camshaft Sprocket

5.

Short Tension Rail

6.

Long Tension Rail (with 3 Lubrication Holes)

7.

Hydraulic Tensioner

The chain is routed from the crankshaft over a guide rail
to the intake and exhaust camshaft sprockets. A two
piece hydraulically tensioned guide rail lubricates (three
oil outlets provided) and "self adjusts” the chain.

Oil Outlets

11410014.eps

Camshafts: The 554 cast iron overhead camshafts are hol¬
low and are strengthened by heat treating the journals and
cam lobes. The duration and lift (12 mm) of the lobes are the
same on both camshafts.

The camshafts are not interchangeable, therefore they should
be marked before disassembly.

The camshaft lobes have oil grooves (shown by arrows to the
right) that provide lubrication from the camshaft journals to the
lobes and the valve fingers.

The camshafts must be removed and installed with the press
fixture (Special Tool #90 88 6 114 380 as shown in the Repair
Instructions).

The camshafts are "timed" with the bridged location tool
(pinned into camshaft as shown in the Repair Instructions).

14

M Engines - S54B32

The VANOS enhanced camshaft spread angles
are:

Intake (E) 70° - 130°

Exhaust (A)83° - 128°

O' KW

7HT KW

11410021.bmp

The camshafts are supported by 7 bearing jour¬
nals machined into the cylinder head.

The bearing journal caps are location specific.
The markings are:

1 .

E=lntake Side Number 2-7

2.

A=Exhaust Side Number 2-7

11410018.jpg

The first camshaft bearing journal also serves
as the thrust bearing (unmarked).

This two-piece bearing flange is forged to sup¬
port VANOS axial loads.

The thrust bearing flange is bolted to the face
of the cylinder head. This component is not sep¬
arately available because the journals are
machined with the cylinder head.

11410021 .jpg

15

M Engines - S54B32

An impulse wheel is mounted on the end of
each camshaft for position detection. The
impulse wheels are secured by a removable bolt
( 1 ).

The intake camshaft impulse wheel has 6 lugs
and the exhaust camshaft impulse wheel has 7
lugs (with gap).

Valve Train: The camshaft lobe actuates the
valve finger (rocker arm) which rotates on a fin¬
ger (rocker) shaft. The valve finger is secured by
a spring clip and contacts the valve clearance
shim (9 mm diameter) to open the valve.

The adjustable valve clearance set by various
shim thickness is:

1 .

Intake 0.18 - 0.23mm

2.

Exhaust 0.28-0.33mm

*

Set With Engine Temperature < 35° C

Two feeler gages and a holder with a magnetic
tip (Special Tools) are required to adjust the
valve clearance. The cam lobe must be rotated
away from the valve finger for maximum clear¬
ance.

To access the valve clearance shim, remove the
finger securing clip. Slide the finger away from
the valve spring to expose the shim. Use the
magnetic tip holder to extract the shim.

The shims (shown by the arrow to the right) are
available in sizes from 1.72 to 2.52 mm at 0.04
mm increments.

16

M Engines - S54B32

The finger (rocker) shafts are secured with locating
bolts (one perside) atthe back of the cylinder head (1).

Remove the threaded access bolts (1) from the rear
face of the cylinder head and push the shafts through.

Both finger shafts are hollow, the exhaust shaft
is unique because it supplies oil to the cam¬
shaft bearing journals.

The exhaust shaft receives oil from the main oil
gallery through the transfer hole (arrow).

The intake camshaft is lubricated directly from
the main oil gallery.

The valve fingers are identical but must be
marked for location when previously used.

Lubrication for the slide contact is provided
from the camshafts (lobe grooves) and an inlet
hole (arrow) allows lubrication forthe finger pivot
journal.

17

M Engines - S54B32

Valves and Valve Springs: The intake and exhaust
valves are lightweight in design to reduce reciprocating
mass. The valve diameter is:

1 .

Intake 35 mm

2.

Exhaust 30.5 mm

3.

Stem-Intake / Exhaust 6.0 mm

The exhaust valve stems are sodium filled to enhance
cooling.

CAUTION! Consult the Repair Instructions before per¬
forming any repairs and for proper disposal of sodium
filled valves.

The valve spring assembly consists of two progressive
tensioned valve springs.

The springs are marked for correct installation due to
progressive tensioning (paint stripes facing down
towards cylinder head).

Notes:

11410030.tiff

18

M Engines - S54B32

VANOS

Performance, torque, idle characteristics and
exhaust emissions reduction are improved by
variable camshaft timing (VANOS).

The S54 engine uses double VANOS to adjust
the spread angles of the intake and exhaust
camshafts.

This system uses a high pressure (100 Bar) con¬
trol system that ensures responsive and accu¬
rate camshaft adjustments to meet the high per¬
formance requirements of the M Engines.

The VANOS unit is mounted directly on the front
of the cylinder head.

The VANOS unit contains the hydraulically actu¬
ated mechanical drives (1), the electronically
controlled oil pressure regulating solenoids (2)
and the 100 Bar pressure regulating valve (3).

The back view of the VANOS unit shows the
inlet oil supply pressure reducing valve (4) and
the radial piston high pressure output pump dri¬
ven by the exhaust camshaft (5).

11410072.eps

The VANOS solenoid electrical assembly (re¬
moved from the VANOS unit) contains four sole¬
noids.

Two solenoids are required for each adjusting
piston circuit, one for advancing and one for
retarding the camshaft timing. The solenoids are
controlled by the ECM .

11410073.eps

19

M Engines - S54B32

The adjustment shafts contain two sets of
splines that engage with:

m

Camshaft Sleeves (Straight Splines)

2.

Chain Driven Sprocket (Helical Splines)

11410037.jpg

The camshaft sleeves are bolted to the end of
the camshafts and engage with the straight
spline of the adjustment shaft shown above.

11410074.eps

The chain driven sprocket and spacer sleeve
assembly is shown to the right (one assembly
per camshaft). The sprocket engages with the
helical splines of the adjustment shaft shown
above.

The exhaust camshaft sprocket assembly has
two drive "lugs” that must be aligned with the
radial piston oil pump during installation.

20

M Engines - S54B32

VAN05 mechanical operation is dependent on oil pressure applied to position the control
pistons. The double VANOS camshafts are infinitely adjustable within the mechanical trav¬
el limits of the drive gears.

When oil pressure is applied to the control piston, the piston moves causing the splined
adjustment shaft to move. The straight splines slide within the camshaft sleeve. The helical
splines rotate the camshaft drive sprocket changing the position in relation to the camshaft
position which advances/retards the camshaft timing.

The total adjustment range of the intake camshaft is 60°
The total adjustment range of the exhaust camshaft is 45-

The "default” mechanical stop position without VANOS influence is:

Intake Camshaft = Retarded (130-spread angle)
Exhaust Camshaft = Advance (83- spread angle)

21

M Engines - S54B32

Oil is supplied from the main gallery through the
front of cylinder head (arrow) to the inlet pres¬
sure reducing valve.

Pressure Reducing Valve: The pressure
reducing valve supplies oil to the radial piston
high pressure oil pump. It is located between
the cylinder head and the VANOS unit.

11410042.tiff

The valve ensures the oil pressure supply to the
VANOS pump is 0.5 Bar regardless of the vary¬
ing pressure from the main oil pressure gallery.
The pressure reducing valve is pressed into the
VANOS unit and secured by an "o-ring”.

11410080.eps

100 Bar Pressure Regulating Valve: The 100

Bar pressure regulating valve is mounted in the
VANOS unit. This valve regulates the pressure
produced by the radial piston high pressure oil
pump.

Note: The 100 Bar pressure regulating valve is
not adjustable.

11410002.eps

VANOS Accumulator: The VANOS accumula¬
tor ensures that there is a sufficient volume of oil
underpressure to adjustthe camshafts underall
engine operating conditions.

The accumulator is Nitrogen charged and is
located on the exhaust side of the engine be¬
hind the A/C compressor. It is connected to the
VANOS unit by a high pressure line.

11410076.eps

22

M Engines - S54B32

5

1 .

Engine Oil Pump

7.

Exhaust Camshaft Inlet Solenoid Valve

2.

Engine Oil Filter

8.

Exhaust Camshaft Outlet Solenoid Valve

3.

Pressure Reducing Valve (0.5 Bar)

9.

Intake Camshaft Outlet Solenoid Valve

4.

VANOS Oil Pump

10.

Intake Camshaft Inlet Solenoid Valve

5.

VANOS Accumulator

11.

Exhaust Camshaft Control Piston (Advance)

6.

100 Bar Pressure Regulating Valve

12.

Intake Camshaft Control Piston (Retard)

VANOS system hydraulic operation:

When the engine starts, oil from the main engine oil pump is fed under pressure to the
pressure reducing valve.

The oil pressure is dropped to approximately 0.5 Bar and fed to the radial piston high
pressure oil pump.

The pump is driven by the exhaust camshaft and the 100 bar pressure is built up by the
pressure regulating valve. The volume of pressurized oil is stored in the accumulator
supplying both adjustment pistons. Both pistons are held in the default position by the
high pressure oil.

23

M Engines - S54B32

At the same time the high pressure oil is available at the inlet solenoids of both adjust¬
ment pistons.

VANOS adjustment is carried out by the ECM pulsing the inlet and outlet solenoids to
allow pressurized oil to the back side of the adjustment pistons. The surface area on this
side of the piston is larger so that the oil pressure is greater and the adjustment piston
will move causing the valve timing to change.

The piston is connected to the adjustment shaft. As the piston moves, the shaft turns
the helical splines varying the camshaft sprocket position in relation to the camshafts.

CAUTION! The VANOS system is under high pressure (100 Bar). Consult the Repair
Instructions before performing any repairs.

Workshop Hints

When installing the intake camshaft, a visual
"sight” is the cam lobes on cylinder number 1
should be pointing horizontally inwards (as
shown on the right).

When installing the exhaust camshaft, the cam
lobes for cylinder number 1 should be pointing
horizontally inwards (refer to Repair Instruc¬
tions for detailed graphics).

The VANOS function test can be performed by
using Special Tools:

#90 88 6 126 411
#90 88 6 126 050

Regulated Compressed Air (2-8 bar)

Refer to the Repair Instructions for the VANOS
function test procedures.

24

M Engines - S54B32

E46 M3 Shown

Intake Air Plenum: The intake air plenum is
designed for maximum volume required for the
554 engine. The air filter housing and intake
manifold are different on the M roadster and M
coupe as compared with the M3 due to the
under hood dimensions.

The flow characteristics of the one-piece plastic
shell is enhanced by internal "funnel" cones to
direct the intake air to the throttle housings.

11410043 .jpg

The plenum is attached to the throttle housings
by rubber sleeves. A Special Tool (clamp pliers)
is required to secure the one-time use clamps.

External Air Distribution Pipe j

11410044.jpg

Intake Air System: The S54 uses six individual throttle housings operated by an EDR
actuator (1 electronic throttle control). For low engine speed (low load) and idling, intake air
is provided by an idle air actuator (2). The valve regulates air flow through an external air
distribution pipe to the individual throttle housings. Fuel tank vapor intake is regulated by
the Evaporative Emission Valve (3).

Refer to the Repair Instructions for the procedure to adjust and synchronize the throttle
housings.

25

M Engines - S54B32

Fuel Supply: The fuel is supplied through a
Non Return Fuel Rail System. This system is
used on the S54 for LEV compliancy.

The fuel supply pressure is controlled by the 5
Bar fuel pressure regulator integrated in the fuel
filter assembly. The regulator is influenced by
engine vacuum via a hose connected to the
external air distribution pipe. The fuel exits the
fuel pressure regulator supplying the fuel rail
and the injectors. The E46 M 3 fuel filter assem¬
bly is located under the left front floor area (next
to the frame rail).

The fuel return line is located on the filter/regu¬
lator assembly which directs the unused fuel
back to the fuel tank. The fuel tank hydrocar¬
bons are reduced by returning the fuel from this
point instead of from the fuel rail.

The 554 uses Bosch (4 hole plate)fuel injectors.
The ECM controls the fuel injectors to regulate
the air/fuel mixture.

The injector identification markings are:

m

BMW Number

2 .

Fuel Injector Code

3.

Manufacturing Date (week 06 year 2000)

4.

B+ Voltage Connection

E46 M3 Shown

11410046.tiff

Ignition Coils: The 554 uses "pencil type” igni¬
tion coils manufactured by Bremi. The six indi¬
vidual ignition coils are integrated with the spark
plug connector (boot).

The coils are removed by lifting the swivel latch
connector retainer to release the wiring har¬
ness, apply a slight twist and lift the assembly
upwards.

NGK DCPR8EKP

are used.

dual electrode spark plugs

11410047.tiff

26

M Engines - S54B32

11410048.bmp

Clutch Assembly: The 554 clutch assembly is
specially designed to transfer the high torque to
the driveline and dampen vibrations throughout
the rpm range.

The clutch assembly consists of:

Hydraulically Dampened Dual-Mass Flywheel
Diaphragm Type Pressure Plate and Drive Disk

Exhaust System: The US S54 uses two high
performance stainless steel exhaust manifolds.
The catalytic converters are integral with each
exhaust manifold.

Each exhaust manifold/catalyst contains a pre
(1) and post (2) oxygen sensor. The sensors
require a Special Tool (crescent wrench with
swivel adapter) for removal.

The E46 M3 exhaust system is a dual channel
up to the muffler. By using the M-mobility kit,
additional clearance is provided for the 40 liter
half-shell muffler With four outlets. The M road¬
ster and M coupe have separate dual mufflers

11410049.tiff

27

M Engines - S54B32

Review Questions

1. What is the valve clearance and at what temperature should it be checked 7

Intake_ Exhaust_ Engine Temperature_

2. The crankshaft mounted impulse wheel on the 554 provides:

3. What does the term "cracked" connecting rod mean 7

4. What is the function(s) of the oil pumps on the S54 7

5. Regarding the Crankcase Ventilation System, what is the purpose of the Check Valve
in the oil return line from the intake manifold 7

6. When installing the camshafts, they should be installed based on what visual sight 7

7. What is unique about the exhaust finger (rocker) shaft 7

8. What are the two differences between the intake and exhaust valves 7

9. What must be "aligned" with the radial piston high pressure pump when installing the

VANOS unit 7 _

10. Where is the fuel pressure tested on the E46 M3 and what is the nominal pressure 7

28

M Engines - S54B32