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Alternator belt. Porsche 911 / 914 - 9991921765A
9991921765A/1
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
Alternator belt, Narrow V-belt.
Belt size: 10 x 713 mm
The V-belt runs between the crankshaft pulley and the alternator/fan pulley. It’s the primary mechanical link that spins the alternator to charge the battery and, on air-cooled 911s and 914-6 models, turns the engine cooling fan.
Fits:
Porsche 911 1965 - 1973
Porsche 911 Turbo 1976 >>
Porsche 911 SC 1974 - 1979 (Check Size of your Belt)
Porsche 911 SC 1980 - 1983
Porsche 911 3.2L 1984 - 1989
Porsche 914 1970 - 1976
Please note: Always confirm against the belt size currently fitted and pulley setup before ordering.
Why Replacement Matters - With age and mileage, belts:
• Crack, glaze, or harden, reducing grip
• Stretch, making correct tension impossible
• Begin to slip, causing charging issues and, on air-cooled engines, reduced cooling fan speed
A slipping or failing belt can lead to battery discharge, warning lights, overheating, or being stranded. Fitting a fresh belt restores reliable alternator and fan drive, protecting both the engine and electrical system.
When to Replace - Consider replacing the alternator belt if:
• You see cracks, fraying, glazing, or missing chunks in the belt rubber
• The belt squeals on startup or under load
• The belt has stretched and can’t be tensioned correctly
• You’re doing routine service on a classic 911 / 914-6 or preparing for a long trip
• The car is undergoing engine-out work or restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991921765A
The product you are viewing cross references to these numbers
Belt size: 10 x 713 mm
The V-belt runs between the crankshaft pulley and the alternator/fan pulley. It’s the primary mechanical link that spins the alternator to charge the battery and, on air-cooled 911s and 914-6 models, turns the engine cooling fan.
Fits:
Porsche 911 1965 - 1973
Porsche 911 Turbo 1976 >>
Porsche 911 SC 1974 - 1979 (Check Size of your Belt)
Porsche 911 SC 1980 - 1983
Porsche 911 3.2L 1984 - 1989
Porsche 914 1970 - 1976
Please note: Always confirm against the belt size currently fitted and pulley setup before ordering.
Why Replacement Matters - With age and mileage, belts:
• Crack, glaze, or harden, reducing grip
• Stretch, making correct tension impossible
• Begin to slip, causing charging issues and, on air-cooled engines, reduced cooling fan speed
A slipping or failing belt can lead to battery discharge, warning lights, overheating, or being stranded. Fitting a fresh belt restores reliable alternator and fan drive, protecting both the engine and electrical system.
When to Replace - Consider replacing the alternator belt if:
• You see cracks, fraying, glazing, or missing chunks in the belt rubber
• The belt squeals on startup or under load
• The belt has stretched and can’t be tensioned correctly
• You’re doing routine service on a classic 911 / 914-6 or preparing for a long trip
• The car is undergoing engine-out work or restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991921765A
99919217650
9991921765A
520100715
The product you are viewing cross references to these numbers
Price: £7.96
In stock
Related products
Vehicle Group
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Information
Drive Belt Porsche 955 Cayenne 4.5L V8 / Turbo / Turbo S
Fits:
Porsche 955 Cayenne 4.5L V8
Porsche 955 Cayenne 4.5L Turbo
Porsche 955 Cayenne 4.5L Turbo S
For models up to 2006
Fits:
Porsche 955 Cayenne 4.5L V8
Porsche 955 Cayenne 4.5L Turbo
Porsche 955 Cayenne 4.5L Turbo S
For models up to 2006
Price: £164.16
Orderable
Vehicle Group
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Information
Drive Belt Porsche 955 Cayenne 4.5L V8 / Turbo / Turbo S
Fits:
Porsche 955 Cayenne 4.5L V8
Porsche 955 Cayenne 4.5L Turbo
Porsche 955 Cayenne 4.5L Turbo S
For models up to 2006
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919238050
The product you are viewing cross references to these numbers
Fits:
Porsche 955 Cayenne 4.5L V8
Porsche 955 Cayenne 4.5L Turbo
Porsche 955 Cayenne 4.5L Turbo S
For models up to 2006
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919238050
99919238050
The product you are viewing cross references to these numbers
Price: £59.95
In stock
Vehicle Group
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Information
Drive Belt.
The OE Match Drive Belt is a high-quality replacement auxiliary drive belt designed to transmit power from the engine crankshaft to essential engine-driven accessories. Manufactured to OE specifications for fit, durability and performance, this multi-ribbed belt ensures the efficient operation of components such as the alternator, water pump, air conditioning compressor and power steering pump, depending on the vehicle's specification.
Fits:
Manufactured from premium-grade EPDM rubber with high-strength tensile reinforcement, the drive belt is engineered to withstand constant flexing, high rotational speeds, heat and demanding operating conditions. Precision-moulded ribs provide excellent grip and smooth power transmission while minimising slippage and noise.
What This Product Does:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919238050
The product you are viewing cross references to these numbers
The OE Match Drive Belt is a high-quality replacement auxiliary drive belt designed to transmit power from the engine crankshaft to essential engine-driven accessories. Manufactured to OE specifications for fit, durability and performance, this multi-ribbed belt ensures the efficient operation of components such as the alternator, water pump, air conditioning compressor and power steering pump, depending on the vehicle's specification.
Fits:
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Manufactured from premium-grade EPDM rubber with high-strength tensile reinforcement, the drive belt is engineered to withstand constant flexing, high rotational speeds, heat and demanding operating conditions. Precision-moulded ribs provide excellent grip and smooth power transmission while minimising slippage and noise.
What This Product Does:
- Transfers power from the engine crankshaft to auxiliary components.
- Drives systems such as the alternator, water pump, air conditioning compressor and power steering pump where applicable.
- Maintains reliable operation of essential engine accessories.
- Supports battery charging and electrical system performance.
- Helps maintain coolant circulation where the water pump is belt driven.
- Enables correct operation of the air conditioning system.
- Provides smooth and efficient power transmission.
- Contributes to overall engine reliability and performance.
Symptoms Of Wear Or Failure:
- Squealing or chirping noises from the engine bay.
- Visible cracks, fraying or glazing on the belt surface.
- Belt slippage during operation.
- Battery or charging system warning light.
- Reduced alternator output.
- Air conditioning performance loss.
- Engine overheating if the water pump is belt driven.
- Heavy steering if the power steering pump is belt driven.
- Excessive belt vibration.
- Complete loss of accessory drive if the belt breaks.
Why Replacement Matters:
- The auxiliary drive belt operates continuously whenever the engine is running and is exposed to constant tension, heat, vibration, moisture and contamination from dirt and oil. Over time, the belt material can harden, crack, stretch or wear, reducing its ability to transfer power efficiently.
- A worn or damaged drive belt can cause poor performance of engine accessories, leading to charging issues, reduced cooling efficiency, loss of air conditioning or power steering assistance, and in some applications, engine overheating. If the belt fails completely, multiple engine systems can stop functioning simultaneously, potentially resulting in vehicle breakdown.
- Replacing a worn drive belt restores reliable power transmission and helps prevent unexpected accessory failures. An OE Match replacement provides factory-style fitment, precise rib geometry and long-lasting durability, ensuring dependable performance and helping maintain the reliability expected from your Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919238050
99919238050
The product you are viewing cross references to these numbers
Price: £45.00
Arriving soon