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Alternator belt, 9.5 x 725. Porsche 911 1974-79 - 99919209750
99919209750/2
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
Alternator belt, Belt size: 9.5 x 725.
This OE Match alternator belt is a replacement engine drive belt for Porsche 911 models from 1974 to 1979. It is designed to match the original-style fitment and function. This replacement drive belt helps power the alternator and cooling fan assembly, supporting reliable battery charging and engine cooling system operation.
Fits:
Porsche 911 Turbo/SC 1974 - 1979 (Please choose by size)
Diagram ref no 12
The alternator belt transfers rotational drive from the engine pulley to the alternator and fan assembly. This allows the alternator to generate electrical power for the vehicle while also helping drive the engine cooling fan. A correctly fitted and tensioned belt is essential for reliable charging, cooling airflow, and overall engine operation.
Functions
• Replaces the alternator drive belt
• Drives the alternator and cooling fan assembly
• Supports correct battery charging
• Helps maintain air-cooled engine cooling airflow
• Replaces cracked, glazed, stretched, frayed, noisy, or slipping belts
• Suitable for routine servicing and preventative maintenance
• OE Match replacement for classic Porsche 911 engine service.
Why Replace This Part?
Alternator belts wear over time due to heat, engine vibration, pulley contact, age, and tension changes. A worn belt can crack, glaze, stretch, fray, squeal, slip, or fail completely. If the belt fails, the alternator may stop charging and the cooling fan may stop operating correctly, which can lead to warning lights, battery issues, overheating risk, or vehicle breakdown. Replacing the belt helps maintain dependable charging and cooling system performance.
When to Replace This Part
• The alternator belt is cracked, glazed, frayed, loose, or worn
• Belt squeal or chirping is heard during start-up or acceleration
• The battery warning light appears
• Charging system output is low or inconsistent
• Cooling fan drive is being inspected or serviced
• Alternator, fan, pulleys, or related hardware are being repaired
• Preventative belt replacement is being carried out during scheduled maintenance.
Where it fits on the car
This belt fits on the alternator and cooling fan drive system on Porsche 911 models from 1974 to 1979. It runs between the relevant engine pulley and alternator / fan pulley according to the factory belt routing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919209750
The product you are viewing cross references to these numbers
This OE Match alternator belt is a replacement engine drive belt for Porsche 911 models from 1974 to 1979. It is designed to match the original-style fitment and function. This replacement drive belt helps power the alternator and cooling fan assembly, supporting reliable battery charging and engine cooling system operation.
Fits:
Porsche 911 Turbo/SC 1974 - 1979 (Please choose by size)
Diagram ref no 12
The alternator belt transfers rotational drive from the engine pulley to the alternator and fan assembly. This allows the alternator to generate electrical power for the vehicle while also helping drive the engine cooling fan. A correctly fitted and tensioned belt is essential for reliable charging, cooling airflow, and overall engine operation.
Functions
• Replaces the alternator drive belt
• Drives the alternator and cooling fan assembly
• Supports correct battery charging
• Helps maintain air-cooled engine cooling airflow
• Replaces cracked, glazed, stretched, frayed, noisy, or slipping belts
• Suitable for routine servicing and preventative maintenance
• OE Match replacement for classic Porsche 911 engine service.
Why Replace This Part?
Alternator belts wear over time due to heat, engine vibration, pulley contact, age, and tension changes. A worn belt can crack, glaze, stretch, fray, squeal, slip, or fail completely. If the belt fails, the alternator may stop charging and the cooling fan may stop operating correctly, which can lead to warning lights, battery issues, overheating risk, or vehicle breakdown. Replacing the belt helps maintain dependable charging and cooling system performance.
When to Replace This Part
• The alternator belt is cracked, glazed, frayed, loose, or worn
• Belt squeal or chirping is heard during start-up or acceleration
• The battery warning light appears
• Charging system output is low or inconsistent
• Cooling fan drive is being inspected or serviced
• Alternator, fan, pulleys, or related hardware are being repaired
• Preventative belt replacement is being carried out during scheduled maintenance.
Where it fits on the car
This belt fits on the alternator and cooling fan drive system on Porsche 911 models from 1974 to 1979. It runs between the relevant engine pulley and alternator / fan pulley according to the factory belt routing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919209750
99919209750
The product you are viewing cross references to these numbers
Price: €4.72
In stock
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Vehicle Group
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 992.1 Carrera 2 3.0L 2019-24
- Porsche 992.1 Carrera 4 3.0L 2019-24
- Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.2 Carrera 2 3.0L 2024>>
- Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
Information
Drive Belt. Porsche 981 / 981C / 991.1 / 991.2 / 992 / GT4
Fits:
Porsche 991.1 Carrera 3.4L 2012-16 Engine MA1.04
Porsche 991.1 Carrera S 3.8L 2012-2016 Engine MA1.03
Cars without PDCC
Porsche 991.2 Carrera 3.0L 2017>> Engine MDC.KA
Cars without sport chassis
Porsche 992 Carrera
Porsche 992 S and GTS from 15.06.20
Cars without PDCC
Porsche 992.2 Carrera 2
Porsche 991.1 Turbo 3.8L 2014-18 Engine MA1.71
Porsche 991.2 Turbo 3.8L 2018-20
Cars without PDCC
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 982 (718) Boxster GTS 4.0Ltr
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 982C (718C) Cayman GTS 4.0Ltr
Diagram ref no 7
Related reference numbers
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0PB903137G
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Fits:
Porsche 991.1 Carrera 3.4L 2012-16 Engine MA1.04
Porsche 991.1 Carrera S 3.8L 2012-2016 Engine MA1.03
Cars without PDCC
Porsche 991.2 Carrera 3.0L 2017>> Engine MDC.KA
Cars without sport chassis
Porsche 992 Carrera
Porsche 992 S and GTS from 15.06.20
Cars without PDCC
Porsche 992.2 Carrera 2
Porsche 991.1 Turbo 3.8L 2014-18 Engine MA1.71
Porsche 991.2 Turbo 3.8L 2018-20
Cars without PDCC
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 982 (718) Boxster GTS 4.0Ltr
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 982C (718C) Cayman GTS 4.0Ltr
Diagram ref no 7
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0PB903137G
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6K1767
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Price: €83.37
Arriving soon
Vehicle Group
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 992.1 Carrera 2 3.0L 2019-24
- Porsche 992.1 Carrera 4 3.0L 2019-24
- Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Information
Drive Belt. Porsche 981 / 981C / 991.1 / 991.2 / 992 / GT4.
6 Ribs | Width: 21.36mm | Length: 1768mm.
Fits:
Porsche 991.1 Carrera 3.4L 2012-16 Engine MA1.04
Porsche 991.1 Carrera S 3.8L 2012-2016 Engine MA1.03
Cars without PDCC
Porsche 991.2 Carrera 3.0L 2017>> Engine MDC.KA
Cars without sport chassis
Porsche 992 Carrera
Porsche 992 S and GTS from 15.06.20
Cars without PDCC
Porsche 991.1 Turbo 3.8L 2014-18 Engine MA1.71
Porsche 991.2 Turbo 3.8L 2018-20
Cars without PDCC
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 718 Boxster GTS 4.0Ltr
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 718 Cayman GTS 4.0Ltr
Diagram ref no 7
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0PB903137G
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6 Ribs | Width: 21.36mm | Length: 1768mm.
Fits:
Porsche 991.1 Carrera 3.4L 2012-16 Engine MA1.04
Porsche 991.1 Carrera S 3.8L 2012-2016 Engine MA1.03
Cars without PDCC
Porsche 991.2 Carrera 3.0L 2017>> Engine MDC.KA
Cars without sport chassis
Porsche 992 Carrera
Porsche 992 S and GTS from 15.06.20
Cars without PDCC
Porsche 991.1 Turbo 3.8L 2014-18 Engine MA1.71
Porsche 991.2 Turbo 3.8L 2018-20
Cars without PDCC
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 718 Boxster GTS 4.0Ltr
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 718 Cayman GTS 4.0Ltr
Diagram ref no 7
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0PB903137G
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Price: €34.81
In stock
Vehicle Group
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
Information
Drive belt 1825mm.
Fits:
Cars with PASM and Sport chassis PDCC (I031 / I352)
Porsche 991.1 S 3.8L 2012-16 MA1.03 engine
Porsche 991.1 TURBO 3.8L MA1.71 engine
Porsche 992 S / GTS - 2020 to 2024
For cars with PDDC Option Code 1P7 (Anti roll bar, active body control PDDC)
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
Related reference numbers
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0PB903137E
The product you are viewing cross references to these numbers
Fits:
Cars with PASM and Sport chassis PDCC (I031 / I352)
Porsche 991.1 S 3.8L 2012-16 MA1.03 engine
Porsche 991.1 TURBO 3.8L MA1.71 engine
Porsche 992 S / GTS - 2020 to 2024
For cars with PDDC Option Code 1P7 (Anti roll bar, active body control PDDC)
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
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0PB903137E
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Price: €40.06
Arriving soon