Belt Drive - SMART Series 451 Service Manual

SN_Typ 451_us.book Seite 38 Freitag, 30. November 2007 1:56 13

Belt drive

Belt adjustment and description of stretch belt
Self-tensioning belt drive
The alternator and coolant pump are driven by a poly-
V belt with tensioning device.
The poly-V belt is tensioned via a new spring-loaded
tensioning device. To install and remove the poly-V
belt the tensioning device must be rotated clockwise
using a special tool to slacken the tension in the belt
drive. The tensioning device can then be locked in
place and the poly-V belt removed.
Belt drive
1 Alternator belt pulley
2 Poly-V belt
3 Coolant pump belt pulley
4 Refrigerant compressor belt pulley
38 Introduction of the smart fortwo, Model Series 451
Stretch belt
The refrigerant compressor is driven by a stretch
belt.
The stretch belt does not need a tensioning device,
but it must be replaced after a specified mileage. It is
removed and installed with the aid of a special tool
that guides the stretch belt over the belt pulley of the
refrigerant compressor. The stretch belt can be
pulled on or off the belt pulley by cranking the engine
in its normal direction of rotation.
5 Crankshaft pulley
6 Tensioning device
7 Tensioning device belt pulley
8 Stretch belt
P13.20-2055-00