300SEL (126.025) L6-3.0L (103.981) (1988)
Drive Belt: Service and Repair
Removing and installing poly-V-belt
Preceding work:
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Viscous fan clutch removed.
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Slacken bolt (16) about 1/4-1/2 turn.
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Slacken tensioning nut (5) (turn to the left).
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Take off poly-V-belt (27).
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Check belt pulley profiles for signs of damage and dirt replace if necessary (eg. worn bearing points of tensioning device, dents in belt pulleys
etc.).
Caution! If poly-V-belt has broken or dropped off, check concentricity of shafts and belt pulleys.
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Turn setting pointer (13) to marking (1) (arrow).
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Fit poly-V-belt on beginning at tensioning pulley (1). Refer to routing diagrams. See: Diagrams
Caution! Do not use belt wax or similar products.
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Tension tensioning nut (5) until setting pointer (13) is aligned with marking (2) (arrow). Pay attention to note
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Tighten bolt (16) (75 Nm).
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Check seat of belt on belt pulleys.
Tightening torque in Nm
Securing bolt of tensioning device: 75 Nm