3>Belt Drive (Fan On Crankshaft) - Mercedes-Benz OM 471 Introduction Into Service Manual

3>belt drive (fan on crankshaft)
1 Belt pulley (on vibration damper)
2 Tensioner pulley for poly>V belt (A)
(on the tandem clamping device)
3 Belt pulley (alternator)
4 Belt pulley (A/C compressor)*
5 Pulley
6 Belt pulley (coolant pump)
7 Pulley
8 Pulley
9 Guide pulley (on the tandem clamping
device)
10 Tensioner pulley for poly>V belt (B) (on
the tandem clamping device)
11 Drive plate (fan drive)
12 Tensioning device for fan drive C (fan
drive)
13 Belt pulley (fan drive)
14 Drive plate (fan drive)
15 Fan clutch
16 Tandem clamping device
For a 3>belt drive the fan clutch (15) is mounted on a drive plate
(14) which is mounted rotatable on the belt pulley (1). The fan is
therefore located on the crankshaft axis.
The poly>V belt (A) drives the A/C compressor, the coolant pump
and the alternator.
The poly>V belt (B) and (C) together drive the fan.
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
A Poly>V belt (basic belt drive)
B Poly>V belt (fan drive)
C Poly>V belt (fan drive)
– This printout will not be recorded by the update service. Status: 09 / 2011 –
As>built configurations
* if no A/C compressor is installed: backup
belt pulley
The poly>V belt (B) drives the guide pulley (8) which sits on an axle
with the drive plate (11). The poly>V belt (C) is driven over the
drive plate (11) which in turn drives the drive plate (14) lying on
the crankshaft axis.
For a rigid fan clutch the gear ratio of the crankcase speed and fan
speed i, also here = 1.2.
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