2002 BMW 745i crankshaft

Downloaded from www.Manualslib.com manuals search engine SubjectPage
Components
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
- Coolant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
- Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
- Map-Controlled Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
- Cooling Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
- Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
- Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
- Transmission Oil/Water Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . .44
- Electrically-Operated Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
- Viscous Coupling Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Engine block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
- Oil Sump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
- Crankcase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
- Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
- Connecting Rods and Pistons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
- Flywheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
- Vibration Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
- Oil Jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
- Oil Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
- Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
- Oil Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
- Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
- Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Review Questions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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N62 Engine
Technical Data

E En
ng
gi
in
ne
e
N N6
62
2B
B4
44
4


Design 8 Cylinder V

V Angle 90°

Displacement (cm3) 4,398

Bore/Stroke (mm) 92/82.7

Cylinder Gap (mm) 98

Main Crankshaft Bearing Diameter (mm) 70

Output (kW)
at speed (rpm) 325
6,100

Torque (Nm)
at Speed (RPM) 330
3,600

Cut-off speed (RPM) 6.500

Compression Ratio 10.0

Valves / Cylinders 4

Intake Valve Diameter (mm) 35

Exhaust Valve Diameter (mm) 29

Intake Valve Lift (mm) 0.3 – 9.85

Exhaust Valve Lift (mm) 9.7

Cams Open Period (º crankshaft) 282/254

Engine Weight (kg) 213

Fuel 91 Octane

Firing Order 1-5-4-8-6-3-7-2

Knock Sensor Yes

Variable Intake Manifold Yes

Digital Motor Electronics ME 9.2 with Valvetronic Control Unit

Complies with Exhaust Emission Regulations EU-3
EU-4
LEV
Engine Length (mm) 704

Fuel Consumption Saving Compared with the M62 14%

Downloaded from www.Manualslib.com manuals search engine Ancillary Components and Drive Belts
Drive Belts
The belt drive has two components and is subdivided into the main and A/C drives. Both
belts are driven by the crankshaft pulley.
A 4 rib belt is used to drive the air conditioning compressor and a 6 rib belt is used for the
main drive. Each drive belt has a maintenance free tensioning unit with tensioning pulley
and torsioner.
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The tensioning pulley is pushed back using a
Torx tool in the recess provided (1) and fixed in
this position by inserting a locking pin as shown
(2).
16
N62 Engine
42-02-15 Ancillary Components and
Drive Belts
1. Air Conditioning Compressor
2. 4 Rib A/C Drive Belt
3. Crankshaft Pulley
4. Water Pump
5. Tensioning Unit Main Drive Belt
6. Alternator
7. Deflection Pulley
8. Power Steering Pump
9. 6 Rib Drive Belt
10. Tensioner Unit A/C Drive Belt
42-02-16

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N62 Engine
Bi-VANOS (Variable Camshaft Adjustment)
The N62 features compact infinitely variable vane-type VANOS for the intake and exhaust
camshafts. The VANOS unit is easy to remove and install. The VANOS unit is designed as
an integral component of the chain drive and is secured to the respective camshaft with a
central bolt. The camshaft adjustment rate is 60º (as compared with the crankshaft).
The VANOS unit gear teeth are visibly different to match the new toothed chain. The
VANOS unit for the cylinders 1-4 exhaust shaft has mounting provisions for the vacuum
pump drive. A spring plate is fitted between the VANOS unit and the vacuum pump drive
to reduce wear (3). The V VA
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for intake and exhaust installa-
tion positions.
The VANOS units are supplied with oil via ports in the camshafts. The oil ports are located
on the left and right of the thrust bearing. Depending on the individual VANOS adjustment
direction, the VANOS is supplied with oil via either the rear oil ports (1 & 2) or the front oil
ports (3 & 4). The oil moves through the camshaft to the VANOS units.
VANOS Units
1. VANOS Unit Exhaust Side
2. VANOS Central Bolt
3. Spring Plate
4. VANOS Unit Intake Side
5. Toothed Chain Gear Teeth
VANOS Oil Ports
1&2. Rear Oil Duct with Four Holes
3&4. Front Oil Duct with Four Holes
5. Front Oil Duct Outlets
6&7. Hook Sealing Washer.43-02-39

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N62 Engine
Toothed Chain
The camshafts are driven by the crankshaft
using newly developed maintenance free
toothed chains.
The toothed chain gear wheels are located on
the crankshaft and on the VANOS unit. Use of
the new toothed chains (1) optimizes the drive
chain rolling process and reduces noise.
Crankshaft Sprocket
The crankshaft sprocket (3) has three sets of gear
teeth:
1. One roller chain gear wheel for the oil pump drive.
2. Two toothed chain gear wheels for the camshaft drives.
N No
ot
te
e:
:

The sprocket will also be fitted to a 12-cylinder
engine variant which will be available in the future.
Please observe the installation instructions and the rel-
evant labels (V8 Front/V12 Front) when installing the
sprocket.
Chain Tensioner (cylinder bank 1-4)
A chain tensioner is mounted in the side of the cylinder
head for each camshaft drive chain. There is a guide
ball in the chain tensioner tip that moves in an arched
groove in the tensioning rail.
The tensioner seal must be replaced each time the
tensioner is disassembled. The tensioners are the
same for both the left and the right cylinder heads.
42-02-51
42-02-52
Chain Tensioner
1. Chain Tensioner
2. Tensioning Rail
3. Bearing Pin
42-02-55

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N62 Engine
Leakage Restraint System in the Water Pump
The water pump has a leakage restraint system for the functional leakage from the pump
shaft piston ring type seal. The coolant which escapes through the pump shaft sliding ring
seal usually accumulates and evaporates through a hold in the leakage chamber (evapora-
tion area).
If the sliding ring seal is faulty, the leakage chamber fills
completely with coolant. Sliding ring seal leakages can
be detected by monitoring the fluid level in the leakage
chamber (inspection hole).
N No
ot
te
e:
:

In the past, fully functional water pumps were often replaced because the functional
sliding ring seal leakage which is necessary for water pump operation resulted in evapora-
tion residues being left on the external walls of the water pump.
The leakage restraint system has the advantage in that the coolant escaping from the slid-
ing ring seal (normal, functional leakage) evaporates without a trace and cannot be mis-
takenly identified as a water pump defect during visual inspections.
Timing Chain Cover Lower Section
The waterpump mounts to the lower section to
channel coolant to the engine block.
42-02-61 Water Pump
1. Impeller
2. Sliding Ring Seal
3. Leakage Chamber / Evaporation Space
4. Leakage Chamber Cover
5. Delivery from the sliding ring seal to the leakage chamber
6. Hub of pulley and viscous clutch
Timing Chain Cover Lower Section
1. Coolant to Engine
2. Rear Water Pump Housing in Lower Section
3. Mount for Drive Belt Tensioner Pulley
4. Crankshaft Radial Seal
42-02-62

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N62 Engine
Crankshaft
The N62 uses an inductively hardened cast-iron crankshaft. The crankshaft has five main
bearings (familiar 4 bolt cast iron caps) and is hollowed around bearing journals 2, 3, and
4 for weight reduction. The fifth bearing is also the “thrust” bearing.
The crankshaft stroke for the B44
is 82.7 mm.
Crankshaft Thrust Bearing
The thrust bearing halves are multiple pieces that are assem-
bled as one part for the the number five main bearing at the
rear of the engine. The bearing thickness conforms to the
familiar triple classification system (yellow - green - white).
Piston and Connecting Rod
The reduced weight cast piston contains integrated
valve reliefs in the piston crown. The pistons are made
from high-temperature aluminum alloy equipped with
three piston rings.
• First piston ring groove = square ring
• Second piston ring groove = taperface ring
• Third piston ring groove = three-part oil control ring
The forged steel connecting rod and cap is separated
by the familiar “cracked” process. The connecting rod
(large end) is angled at 30º allowing sufficient articula-
tion in a very compact space. The pistons are cooled
by oil jets spraying under the exhaust side of the pis-
ton crown.
Crankshaft
1. Crankshaft Sprocket
2-4. Hollowed Area (Weight Reduction)
42-02-68
42-02-70
42-03-70

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N62 Engine
Flywheel
The lightweight flywheel is made from a laminated plate. The
starter ring gear is also the increment wheel for engine speed
and crankshaft positioning/misfire detection.
The ring gear is riveted directly to the flexplate (6). The fly-
wheel diameter is 320 mm.
Vibration Damper
The vibration damper is a torsional vibration absorber (axial
design). The outer edge of the damper has a notch (1) to
accept the locating tool when positioning the crankshaft for
initial setting.
The locating tool inserts into the raised mount in the front
cover (2). R Re
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Engine Mounting
The engine is secured by two hydraulic damping mounts that are located on the front axle
carrier (structure and function are the same as the E38/M62).
N No
ot
te
es
s:
:

12