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Alternator belt. Porsche 928 1984-86 - 99919225050
99919225050/1
Vehicle Group
- Porsche 928S2 4.7L 1984-86
Information
Alternator Belt.
The OE Match Alternator Belt is a high-quality replacement drive belt designed to transfer power from the engine crankshaft to the alternator and other belt-driven ancillary components where applicable. Manufactured to OE specifications for fit, durability and performance, this belt ensures reliable operation of the vehicle's charging system and helps maintain consistent electrical power supply.
Fits:
Constructed from high-strength, heat-resistant materials, the alternator belt is engineered to withstand continuous rotation, engine heat and varying load conditions. Proper belt operation is essential for maintaining battery charging, electrical system performance and overall vehicle reliability.
What This Product Does:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919225050
The product you are viewing cross references to these numbers
The OE Match Alternator Belt is a high-quality replacement drive belt designed to transfer power from the engine crankshaft to the alternator and other belt-driven ancillary components where applicable. Manufactured to OE specifications for fit, durability and performance, this belt ensures reliable operation of the vehicle's charging system and helps maintain consistent electrical power supply.
Fits:
- Porsche 928S2 4.7L 1984-86
Constructed from high-strength, heat-resistant materials, the alternator belt is engineered to withstand continuous rotation, engine heat and varying load conditions. Proper belt operation is essential for maintaining battery charging, electrical system performance and overall vehicle reliability.
What This Product Does:
- Transfers engine power to the alternator.
- Enables the alternator to generate electrical power.
- Maintains battery charging during vehicle operation.
- Supports the operation of the vehicle's electrical systems.
- Provides reliable power transmission under varying engine speeds.
- Helps ensure consistent charging system performance.
- Contributes to overall engine accessory operation.
Symptoms Of Wear Or Failure:
- Squealing or chirping noises from the engine bay.
- Battery warning light illuminated on the dashboard.
- Weak or discharged battery.
- Electrical system performance issues.
- Dimming headlights or interior lights.
- Visible cracking, fraying or glazing of the belt.
- Belt slipping during operation.
- Complete loss of charging system function if the belt breaks.
- Difficulty starting due to insufficient battery charging.
Why Replacement Matters:
- Alternator belts are subjected to constant tension, high rotational speeds, temperature fluctuations and environmental exposure. Over time, the belt material can harden, crack, stretch or wear, reducing its ability to maintain proper grip and power transmission.
- A worn belt may slip, causing reduced alternator output and inadequate battery charging. If the belt fails completely, the alternator will no longer generate electrical power, potentially leading to battery discharge, electrical system failure and vehicle breakdown. In some applications, a failed belt may also affect the operation of other engine-driven accessories.
- Replacing a worn alternator belt helps maintain reliable charging system performance, prevents unexpected breakdowns and ensures continued operation of critical electrical systems. An OE Match replacement provides factory-style fitment, dependable durability and long service life, helping keep your Porsche operating at its best.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919225050
99919225050
The product you are viewing cross references to these numbers
Price: £8.92
In stock
Related products
Vehicle Group
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
Information
Drive Belt Deflection Roller.
Diagram Ref No 8
Symptoms Of Wear Or Failure:
Over time, continuous rotation, engine heat, vibration and contamination can cause the bearings and pulley surfaces of the drive belt deflection roller to deteriorate.
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99611501576
The product you are viewing cross references to these numbers
The OE MATCH Drive Belt Deflection Roller is a high-quality replacement auxiliary drive belt component designed for Porsche 996 Turbo, 997 Turbo and GT3 models. Manufactured to provide OE-style fitment and reliable operation, this deflection roller helps guide the engine's auxiliary drive belt along its designated path, ensuring smooth and consistent operation of the belt-driven accessories.
Fits:- Porsche 996 Turbo
- Porsche 997 Turbo
- Porsche 996 GT3 1999-05
- Porsche 997 GT3 2007-11
Diagram Ref No 8
Also known as an idler pulley or guide roller, this component forms part of the engine's auxiliary belt drive system. It works alongside the drive belt and tensioner assembly to maintain correct belt alignment and routing during engine operation.
The roller incorporates a rotating pulley and bearing assembly designed to accommodate continuous engine operation, vibration and changing rotational speeds.
Over time, the original roller bearings can deteriorate due to age, heat, contamination and prolonged use, potentially resulting in excessive noise, poor belt tracking or complete bearing failure.
Ideal for replacing worn, noisy, seized or damaged original rollers, the OE MATCH Drive Belt Deflection Roller provides a practical replacement solution for routine servicing, preventative maintenance and engine repairs.
What This Product Does:The drive belt deflection roller guides the auxiliary drive belt around the engine's pulley system, helping maintain the correct belt routing and alignment.
Unlike the belt tensioner, which applies the necessary tension to the belt, the deflection roller primarily provides guidance and support to ensure the belt follows its intended path.
Its key functions include:
- Drive Belt Guidance: Directs the auxiliary drive belt along the correct route around the engine's pulley system.
- Belt Alignment: Helps maintain proper belt positioning and prevents unwanted lateral movement.
- Smooth Belt Operation: The integrated bearing allows the pulley to rotate freely as the drive belt moves across its surface.
- Auxiliary System Support: Contributes to reliable operation of the engine accessories driven by the auxiliary belt.
- Reduced Belt Vibration: Helps maintain stable belt tracking and minimise unwanted movement during engine operation.
- Reduced Operating Noise: A correctly functioning roller supports smooth, quiet belt movement.
- Belt Wear Prevention: Proper alignment helps reduce uneven belt wear, edge damage and premature deterioration.
- Consistent Belt Routing: Maintains the intended belt path as engine speed changes.
- OE-Style Fitment: Provides a replacement for the original guide roller without modification to the specified mounting arrangement.
Symptoms Of Wear Or Failure:
Over time, continuous rotation, engine heat, vibration and contamination can cause the bearings and pulley surfaces of the drive belt deflection roller to deteriorate.
Common signs include:
- Squealing or Chirping Noises: High-pitched noises from the auxiliary belt area may indicate worn bearings, poor belt alignment or excessive friction.
- Grinding or Rumbling Sounds: A deteriorating pulley bearing may produce grinding, rumbling or growling noises while the engine is running.
- Excessive Pulley Play: Side-to-side movement or looseness may indicate wear within the roller bearing.
- Rough Pulley Rotation: A worn bearing may feel rough, notchy or resistant when the pulley is rotated by hand with the belt removed.
- Seized or Sticking Roller: Bearing failure can prevent the pulley from rotating freely, potentially causing the drive belt to slide across a stationary surface.
- Visible Pulley Wobble: A damaged bearing or mounting arrangement may cause the roller to rotate unevenly.
- Uneven Drive Belt Wear: Incorrect tracking can cause excessive wear along the belt edges or running surface.
- Cracked or Damaged Pulley Surface: Physical damage or deterioration may affect smooth belt movement.
- Excessive Belt Vibration: An unstable pulley or incorrectly tensioned belt may produce visible belt movement during operation.
- Burning Rubber Smell: A seized roller can generate friction and heat, potentially damaging the drive belt.
- Drive Belt Slipping or Coming Off: Severe bearing failure or incorrect pulley alignment may cause the belt to move out of position.
- Auxiliary Drive Failure: If the roller seizes or the belt breaks, belt-driven accessories may stop operating.
Why Replacement Matters:
- Replacing a worn or damaged drive belt deflection roller is an important part of maintaining the reliability and correct operation of your Porsche's auxiliary drive belt system.
- The auxiliary drive belt operates continuously while the engine is running, transferring rotational power to essential belt-driven components. The deflection roller plays a critical role in guiding this belt and maintaining its correct path around the engine.
- As the roller bearing deteriorates, it may develop excessive play, resistance or noise. Continued operation with a worn roller can cause incorrect belt tracking, increased friction and premature belt wear.
- If the bearing becomes severely damaged or seizes completely, the belt may overheat, shred or break, potentially causing the sudden loss of belt-driven accessory operation.
- Depending on the engine configuration, auxiliary belt failure can affect important components such as the alternator and water pump. Loss of water pump operation may result in engine overheating, while alternator failure can lead to battery discharge and electrical system problems.
- A failed roller may also damage surrounding pulleys, tensioners or other components within the auxiliary drive system, potentially increasing repair costs.
- Installing a replacement OE MATCH deflection roller helps restore smooth pulley rotation, correct belt guidance and reliable auxiliary drive operation.
- Replacing worn rollers during scheduled belt maintenance is particularly beneficial because it allows associated components to be inspected and renewed before a more serious failure occurs.
- For high-performance Porsche Turbo and GT3 engines, maintaining the condition of the auxiliary drive system is especially important during demanding driving conditions and high engine speeds.
- The OE MATCH Drive Belt Deflection Roller 99611501576/1 offers an OE-style replacement solution designed to support dependable belt operation, reduce unwanted noise and help protect the engine's auxiliary drive components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99611501576
99611501576
99611501571
4149031003
34537
99611501574
99611501573
The product you are viewing cross references to these numbers
Price: £110.00
In stock
Vehicle Group
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII GT2 RS 2011-13
Information
Drive belt, for cars with air conditioning
This OE Match drive belt is a replacement auxiliary engine belt for Porsche 996 Turbo and 997 Turbo models equipped with air conditioning. It is designed to match the original-style fitment and function. This replacement auxiliary belt helps drive engine accessories and supports reliable operation of the vehicle’s charging and auxiliary systems.
Fits:
Porsche 996 Turbo 2000-2005 M96.70 Engine
Porsche 996 GT2 M96.70 Engine
Porsche 997 Turbo 2007-2009 3.6L M97.70 Engine
Porsche 997 GT2 RS 2011 M97.70 Engine
Diagram ref no 9
The drive belt transfers rotational power from the engine pulley to the relevant auxiliary components. On vehicles with air conditioning, the correct belt specification is essential for proper pulley contact, belt tension, and reliable accessory drive operation.
Functions
• Replaces the auxiliary drive belt
• Suitable for cars with air conditioning
• Transfers drive from the engine pulley to auxiliary components
• Helps maintain correct belt tension and pulley contact
• Supports reliable charging and accessory system operation
• Replaces cracked, glazed, stretched, frayed, noisy, or slipping belts
• OE Match replacement for Porsche 996 Turbo and 997 Turbo engine service.
Why Replace This Part?
Drive belts wear over time due to heat, vibration, pulley contact, age, tension changes, and engine bay conditions. A worn belt can crack, glaze, stretch, fray, squeal, slip, or fail completely. If the belt fails, driven auxiliary systems may stop operating correctly, which can lead to warning lights, charging faults, accessory issues, or vehicle breakdown. Replacing the belt helps restore dependable auxiliary drive performance.
When to Replace This Part
• The drive belt is cracked, glazed, frayed, stretched, or worn
• Belt squeal, chirping, or slipping is present
• The belt does not track correctly on the pulleys
• The alternator, pulleys, tensioner, or related components are being serviced
• Charging or accessory drive faults are present
• Preventative belt replacement is being carried out during scheduled maintenance
• The vehicle is undergoing Porsche 996 Turbo or 997 Turbo engine service.
Where it fits on the car
This drive belt fits within the engine auxiliary belt drive system on Porsche 996 Turbo and 997 Turbo models with air conditioning. It runs around the relevant pulleys according to the factory belt routing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919237951
The product you are viewing cross references to these numbers
This OE Match drive belt is a replacement auxiliary engine belt for Porsche 996 Turbo and 997 Turbo models equipped with air conditioning. It is designed to match the original-style fitment and function. This replacement auxiliary belt helps drive engine accessories and supports reliable operation of the vehicle’s charging and auxiliary systems.
Fits:
Porsche 996 Turbo 2000-2005 M96.70 Engine
Porsche 996 GT2 M96.70 Engine
Porsche 997 Turbo 2007-2009 3.6L M97.70 Engine
Porsche 997 GT2 RS 2011 M97.70 Engine
Diagram ref no 9
The drive belt transfers rotational power from the engine pulley to the relevant auxiliary components. On vehicles with air conditioning, the correct belt specification is essential for proper pulley contact, belt tension, and reliable accessory drive operation.
Functions
• Replaces the auxiliary drive belt
• Suitable for cars with air conditioning
• Transfers drive from the engine pulley to auxiliary components
• Helps maintain correct belt tension and pulley contact
• Supports reliable charging and accessory system operation
• Replaces cracked, glazed, stretched, frayed, noisy, or slipping belts
• OE Match replacement for Porsche 996 Turbo and 997 Turbo engine service.
Why Replace This Part?
Drive belts wear over time due to heat, vibration, pulley contact, age, tension changes, and engine bay conditions. A worn belt can crack, glaze, stretch, fray, squeal, slip, or fail completely. If the belt fails, driven auxiliary systems may stop operating correctly, which can lead to warning lights, charging faults, accessory issues, or vehicle breakdown. Replacing the belt helps restore dependable auxiliary drive performance.
When to Replace This Part
• The drive belt is cracked, glazed, frayed, stretched, or worn
• Belt squeal, chirping, or slipping is present
• The belt does not track correctly on the pulleys
• The alternator, pulleys, tensioner, or related components are being serviced
• Charging or accessory drive faults are present
• Preventative belt replacement is being carried out during scheduled maintenance
• The vehicle is undergoing Porsche 996 Turbo or 997 Turbo engine service.
Where it fits on the car
This drive belt fits within the engine auxiliary belt drive system on Porsche 996 Turbo and 997 Turbo models with air conditioning. It runs around the relevant pulleys according to the factory belt routing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919237951
99919237950
99919237951
The product you are viewing cross references to these numbers
Price: £15.75
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