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belt tensioner Genuine Porsche part 99710211700

Code: 99710211700

Genuine Porsche part

belt tensioner

The product code 99710211700 was also found on these diagrams

101-10 - tensioning roller

belt tensioner and belt drive for 996 CARRERA 2/4/4S 1998-05

101-10 - tensioning roller

belt tensioner and belt drive for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L CABRIO S / COUPE S 2005-08

101-10 - tensioning roller

belt tensioner, belt drive 987 Boxster / Boxster S 2005-08

101-010 - tensioning roller

Belt tensioner / Belt drive - 9721, 9720 - 987C.1 Cayman 2.7L / 3.4L 2006-08

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

Drive belt deflection roller. Porsche 996 / Boxster 987 / 997

99710211800/1

Product Information

Drive belt deflection roller.
This tensioner (or idler) pulley is designed for Porsche 911 (996/997) and Boxster/Cayman vehicles. It supports the serpentine/drive belt system, ensuring smooth, stable rotation and correct belt alignment. It helps maintain proper tension, reduces noise, and protects engine accessories from excessive stress. Built to original Porsche standards and engineered for precise fitment and durability.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 987C 2.7L / 3.4L 2005-08 Manual transmission

Diagram ref no 15

Ideal replacement when the original pulley shows signs of wear, bearing noise, belt misalignment or visible belt damage - restoring accessory-drive reliability and avoiding secondary damage from belt failure.

The idler pulley plays a critical role in your accessory belt drive, maintaining the correct path and tension of the belt that powers many engine-mounted systems. When the pulley bearing deteriorates, or the surface becomes worn or grooved, the belt can slip, make noise, or even break—potentially causing loss of alternator, AC compressor or power-steering function. By replacing this component proactively with a quality OE-Match unit, you safeguard those systems and maintain proper engine accessory operation.

When and why to replace:
• Audible bearing noise or rumble coming from the pulley/belt area.
• Visible belt wear, glazing, fraying or mis-tracking across the pulley surface.
• Occasional belt slippage or accessory drive belt squeal on start-up or load.
• Accessory drive servicing (belt replacement, tensioner replacement) where it makes sense to fit the pulley at the same time.
• Higher-mileage vehicle where original pulley may have been in service for many years and bears may be near end-of-life.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710211800

99710211800

4149031110

The product you are viewing cross references to these numbers

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

99710211700/1

Product Information

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.

Fits:

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.

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710211700

99710211700

4149031008

The product you are viewing cross references to these numbers

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

99710211900/1

Product Information

Drive belt deflection roller.
A direct-fit idler/deflection pulley for the auxiliary (serpentine) drive belt. Built to OE geometry, it guides the belt path, stabilises belt tracking, and helps maintain correct wrap on the alternator, A/C compressor and power-steering/water pump pulleys.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Manual transmission

Diagram ref No 12

The deflection roller maintains smooth, stable tension in the auxiliary belt system. It helps guide the belt precisely over pulleys, reduces vibration, and ensures efficient power delivery to engine accessories such as the alternator, A/C compressor, and power steering pump. Built with OE-spec bearings, it delivers quiet operation and long-lasting reliability under high-speed, high-load conditions.

Over time, the bearing inside the roller can wear, dry out, or seize due to constant load and heat exposure. A failing roller may cause belt noise, vibration, or premature belt wear, potentially leading to accessory drive failure.

Replace the deflection roller when:
• You hear squeaking, chirping, or grinding from the belt area
• The pulley feels rough or loose when rotated by hand
• During belt or tensioner replacement as preventive maintenance
• There are signs of belt misalignment or edge fraying

Installing a new deflection roller ensures correct belt tracking, quiet performance, and dependable accessory drive operation.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710211900

99710211900

The product you are viewing cross references to these numbers

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belt tensioner Genuine Porsche part 99710211700