maintenance BMW 745i 2002 E65 N62B44 Engine Workshop Manual

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
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.
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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