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Drive belt deflection roller. Porsche 996 / Boxster 987 / 997 - 99710211800
99710211800/1
Vehicle Group
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
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
The product you are viewing cross references to these numbers
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
Price: £49.95
In stock
Related products
Vehicle Group
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Information
Alternator Belt
OE Match replacement alternator belt for Porsche 964 turbo
models, manufactured in the correct 9.5 x 785mm size.
Fits:
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Diagram Ref No 13A
The alternator belt is an important service component, transferring engine rotation to the alternator and helping maintain the vehicle's electrical charging system. A worn, cracked or incorrectly tensioned belt can slip or fail, resulting in reduced alternator performance and potentially leaving the vehicle without adequate battery charging.
What Does the Alternator Belt Do?
The alternator belt mechanically drives the alternator from the engine. As the engine runs, the belt transfers rotation to the alternator pulley, allowing the alternator to generate electricity and maintain battery charge.
Correct belt condition and tension are therefore essential for reliable operation of the charging system.
Why Do Alternator Belts Fail?
Drive belts are exposed to continuous movement, heat and changing engine speeds. The rubber material gradually deteriorates with age even on vehicles covering relatively low mileage.
Common causes of failure include:
Age-related rubber deterioration Cracking or splitting Incorrect belt tension Pulley misalignment Oil contamination Excessive heat Worn or damaged pulleys Long periods of vehicle storageWhen Should It Be Replaced?
The alternator belt should be replaced if inspection reveals cracking, fraying, glazing, hardening or other deterioration.
Other warning signs can include:
Squealing or slipping noises Charging system problems Visible belt damage Difficulty maintaining correct belt tension Excessive belt movementOn classic Porsche models, periodic visual inspection is advisable regardless of mileage because deterioration can occur simply through age.
Checks During Replacement
When fitting a new alternator belt, also inspect:
Alternator pulley Crankshaft pulley Belt running surfaces Belt alignment Correct belt tension Associated mounting hardware Signs of oil contaminationCorrect tension is important: an excessively loose belt can slip, while excessive tension can place unnecessary load on bearings and associated components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919234550
99919234550
The product you are viewing cross references to these numbers
Price: £9.00
In stock
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Information
Alternator fan belt sensor
The 99310603500 Alternator Fan Belt Sensor is a component designed for use in Porsche 964 and 993 models, specifically addressing the alternator and fan belt system. This sensor plays a critical role in monitoring and ensuring the proper functioning of the alternator belt, which is essential for the vehicle's electrical system and overall performance.
Fits:
Porsche 964 C2 / C4 1992 - 1994
Porsche 993 C2 / C4 1994 - 1997
Porsche 993 Turbo 1994 - 1997
Diagram ref no 1
Key Information:
Part Number: 99310603500
Application: Porsche 964 / 993
Function and Application:
Monitoring Belt Tension: The alternator fan belt sensor is designed to monitor the tension of the alternator belt.
Alert System: If the sensor detects abnormal tension or a potential issue with the fan belt, it triggers an alert or warning signal.
Preventing Belt Failure: By monitoring the belt tension, the sensor helps prevent issues such as slippage or breakage, ensuring the continuous operation of the alternator and the proper charging of the vehicle's electrical system.
Importance of the Alternator Fan Belt Sensor:
The alternator fan belt is crucial for the functioning of the alternator, which plays a key role in charging the vehicle's battery and powering electrical components. The sensor helps prevent potential belt-related issues that could lead to alternator failure, electrical system malfunctions, or battery discharge.
Quality and Reliability:
Crafted to meet Porsche's high standards for quality and reliability, the 99310603500 Alternator Fan Belt Sensor is engineered to withstand the demands of the automotive environment. Its precise monitoring ensures early detection of potential problems, contributing to the overall reliability and performance of Porsche 964 and 993 models.
Whether you are conducting routine maintenance or addressing specific concerns related to the alternator and fan belt system in your Porsche, the alternator fan belt sensor is a critical component for ensuring the optimal functioning of the electrical system. Trust in the quality and engineering excellence of Porsche to maintain the performance of these iconic models.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310603500
The product you are viewing cross references to these numbers
The 99310603500 Alternator Fan Belt Sensor is a component designed for use in Porsche 964 and 993 models, specifically addressing the alternator and fan belt system. This sensor plays a critical role in monitoring and ensuring the proper functioning of the alternator belt, which is essential for the vehicle's electrical system and overall performance.
Fits:
Porsche 964 C2 / C4 1992 - 1994
Porsche 993 C2 / C4 1994 - 1997
Porsche 993 Turbo 1994 - 1997
Diagram ref no 1
Key Information:
Part Number: 99310603500
Application: Porsche 964 / 993
Function and Application:
Monitoring Belt Tension: The alternator fan belt sensor is designed to monitor the tension of the alternator belt.
Alert System: If the sensor detects abnormal tension or a potential issue with the fan belt, it triggers an alert or warning signal.
Preventing Belt Failure: By monitoring the belt tension, the sensor helps prevent issues such as slippage or breakage, ensuring the continuous operation of the alternator and the proper charging of the vehicle's electrical system.
Importance of the Alternator Fan Belt Sensor:
The alternator fan belt is crucial for the functioning of the alternator, which plays a key role in charging the vehicle's battery and powering electrical components. The sensor helps prevent potential belt-related issues that could lead to alternator failure, electrical system malfunctions, or battery discharge.
Quality and Reliability:
Crafted to meet Porsche's high standards for quality and reliability, the 99310603500 Alternator Fan Belt Sensor is engineered to withstand the demands of the automotive environment. Its precise monitoring ensures early detection of potential problems, contributing to the overall reliability and performance of Porsche 964 and 993 models.
Whether you are conducting routine maintenance or addressing specific concerns related to the alternator and fan belt system in your Porsche, the alternator fan belt sensor is a critical component for ensuring the optimal functioning of the electrical system. Trust in the quality and engineering excellence of Porsche to maintain the performance of these iconic models.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310603500
96410631502
99310603500
96410603503
96410603507
The product you are viewing cross references to these numbers
Price: £69.75
In stock
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Information
Alternator / Fan Belt
This OE Match alternator / fan belt is a replacement drive belt for Porsche 964 and 993 models. It is used in the air-cooled engine belt drive system to operate the engine cooling fan and alternator, helping maintain correct engine cooling and battery charging performance.
FAN Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Or Tiptronic Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Or Tiptronic Transmission
Diagram Ref No 13
OR
ALTERNATOR Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Transmission
Diagram Ref 14
The alternator / fan belt transfers drive from the engine pulley to the cooling fan and alternator assembly. On air-cooled Porsche engines, this belt is essential because it powers the fan that moves cooling air across the engine and also drives the alternator to charge the battery and support the vehicle electrical system.
Functions
• Drives the engine cooling fan
• Drives the alternator for battery charging
• Supports correct air-cooled engine temperature control
• Helps maintain stable electrical system voltage
• Prevents loss of cooling fan operation caused by belt wear or failure
• Replaces cracked, glazed, stretched, or worn original belts
• OE Match replacement for correct fit and reliable belt drive performance
Why Replace This Part?
The alternator / fan belt is exposed to heat, rotation, tension, and engine bay wear. Over time, the belt can crack, stretch, glaze, fray, or lose grip. A worn or failed belt can cause charging problems, battery warning lights, cooling fan failure, overheating risk, belt noise, or complete loss of alternator output. Replacing the belt helps maintain reliable cooling and charging system operation.
When to Replace This Part
• The belt is cracked, frayed, glazed, loose, or worn
• There is squealing or slipping from the belt area
• The battery/charging warning light is illuminated
• The alternator is not charging correctly
• The engine cooling fan is not being driven properly
• The belt has been removed during alternator, fan, or pulley service
• As part of routine maintenance on Porsche 964 or 993 air-cooled engines
• As preventative replacement before long journeys or major servicing
Where it fits on the car
This belt fits in the rear engine bay on the engine pulley, alternator, and cooling fan drive assembly. It forms part of the air-cooled engine accessory drive system and is fitted at the fan/alternator housing area.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919233851
The product you are viewing cross references to these numbers
This OE Match alternator / fan belt is a replacement drive belt for Porsche 964 and 993 models. It is used in the air-cooled engine belt drive system to operate the engine cooling fan and alternator, helping maintain correct engine cooling and battery charging performance.
FAN Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Or Tiptronic Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Or Tiptronic Transmission
Diagram Ref No 13
OR
ALTERNATOR Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Transmission
Diagram Ref 14
The alternator / fan belt transfers drive from the engine pulley to the cooling fan and alternator assembly. On air-cooled Porsche engines, this belt is essential because it powers the fan that moves cooling air across the engine and also drives the alternator to charge the battery and support the vehicle electrical system.
Functions
• Drives the engine cooling fan
• Drives the alternator for battery charging
• Supports correct air-cooled engine temperature control
• Helps maintain stable electrical system voltage
• Prevents loss of cooling fan operation caused by belt wear or failure
• Replaces cracked, glazed, stretched, or worn original belts
• OE Match replacement for correct fit and reliable belt drive performance
Why Replace This Part?
The alternator / fan belt is exposed to heat, rotation, tension, and engine bay wear. Over time, the belt can crack, stretch, glaze, fray, or lose grip. A worn or failed belt can cause charging problems, battery warning lights, cooling fan failure, overheating risk, belt noise, or complete loss of alternator output. Replacing the belt helps maintain reliable cooling and charging system operation.
When to Replace This Part
• The belt is cracked, frayed, glazed, loose, or worn
• There is squealing or slipping from the belt area
• The battery/charging warning light is illuminated
• The alternator is not charging correctly
• The engine cooling fan is not being driven properly
• The belt has been removed during alternator, fan, or pulley service
• As part of routine maintenance on Porsche 964 or 993 air-cooled engines
• As preventative replacement before long journeys or major servicing
Where it fits on the car
This belt fits in the rear engine bay on the engine pulley, alternator, and cooling fan drive assembly. It forms part of the air-cooled engine accessory drive system and is fitted at the fan/alternator housing area.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919233851
99919233850
99919233851
The product you are viewing cross references to these numbers
Price: £5.20
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