Drive belt tensioning roller. Porsche 996 / Boxster 987 / Cayman 987C / 997

The Drive Belt Tensioning Roller, identified by part number 997.102.117.00, is a critical component in the accessory drive system of several Porsche models, including the 996, 987 (Boxster and Cayman), and 997 (Carrera) equipped with manual transmissions. This roller maintains proper tension on the serpentine belt, ensuring the efficient operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor.

• Porsche Boxster 987 S 3.2/3.4L 2005-08/08  Manual transmission
• Porsche 996 C2 3.4L 1997-08/01  6-speed Manual transmission
• Porsche 996 C4 3.4L 1997-08/01  6-speed Manual transmission
• Porsche 996 C2 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 996 C4 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 996 C4S 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 997 MK1 Carrera 2 3.6L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 4 3.6L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08  6-speed Manual transmission
• Porsche Cayman 2.7L 987C 2006-08  Manual transmission
• Porsche Cayman S 3.4L 987C 2005-08  Manual transmission

Common Tensioning Roller Issues and Why Replacement is Necessary. Over time, a tensioning roller can wear down due to constant exposure to engine heat and mechanical stress. Typical problems include:

• Bearing Wear: The internal bearing may deteriorate, causing noise and reducing performance.
• Seized Pulley: Rust or corrosion can lock the pulley, disrupting proper belt tension.
• Cracked or Damaged Pulley: Physical damage can misalign the belt and hinder the roller’s function.
• Replacing a worn tensioning roller is crucial to maintain proper belt operation, prevent squealing noises, and avoid potential damage to other engine components.

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Diagram ref no 8