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Alternator Pulley / Pulley Nuts
By OE Match
- 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)
- 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)
Reference numbers: 99957104702
Fits:
Porsche 911 F/G
This hook wrench is an optimized version of the original on-board tool and fits better in the hole of the pulley thanks to the extended and curved pin. The locking key is a must for every 911 F/G model owner and allows you to separate the pulley from the fan wheel, for example to change the alternator V-belt.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99957104702
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- 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)
The OE Match Alternator Fan Pulley is a high-quality replacement engine component designed for Porsche models equipped without an air injection system. Manufactured to OE specifications for fit, balance and durability, this pulley forms a critical part of the engine cooling and charging system drive assembly.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- 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)
Diagram Ref No 8
Mounted within the alternator and cooling fan drive system, the pulley transfers rotational force from the engine belt to drive the alternator and engine cooling fan. Correct pulley operation ensures efficient charging system performance while maintaining the airflow required to cool the engine. Precision manufacturing helps provide smooth operation, accurate belt alignment and reliable long-term performance.
What This Product Does:
- Transfers engine drive power to the alternator and cooling fan assembly.
- Maintains correct cooling fan operating speed.
- Supports efficient engine cooling.
- Enables proper alternator operation and battery charging.
- Ensures accurate drive belt alignment.
- Helps minimise belt wear and slippage.
- Contributes to reliable engine and electrical system performance.
Symptoms Of Wear Or Failure:
- Squealing or chirping noises from the engine bay.
- Drive belt slippage.
- Excessive belt wear.
- Charging system performance issues.
- Battery warning light illumination.
- Reduced engine cooling efficiency.
- Visible pulley wear, cracking or damage.
- Pulley wobble or misalignment.
- Vibration from the alternator or fan assembly.
- Belt throwing or repeated belt failures.
Why Replacement Matters:
- Alternator fan pulleys are subjected to constant rotational loads, engine vibration, belt tension and temperature fluctuations. Over time, pulley surfaces can wear, become damaged or develop alignment issues that affect belt operation and drive system efficiency.
- A worn pulley can lead to belt slippage, reduced alternator output and inadequate cooling fan performance. If left unresolved, this may result in battery charging problems, overheating risks, accelerated belt wear and potential damage to related drive system components. In severe cases, pulley failure can cause complete loss of alternator and cooling fan operation.
- Replacing a worn alternator fan pulley restores proper belt alignment, reliable power transmission and efficient cooling system performance. An OE Match replacement provides factory-style fitment, precise engineering and dependable durability, helping maintain the performance and reliability of your Porsche engine and charging system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010620902
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Fit:
Porsche 911 1978-89 * WITH AIR INJECTION
Diagram ref no 36
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110620803
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Fit:
Porsche 911 1982-89
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91160342801
The product you are viewing cross references to these numbers
- 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 928 4.5L 1978-82
Pulley half specifications: 8 holes / Diameter - 96 mm
Replacement pulley half designed for the front engine V-belt drive system of early Porsche 911/912 and Porsche 914 models. This pulley sits on the generator/fan hub, providing one half of the V-belt sheave assembly that drives the alternator/fan unit via the ribbed or flat belt. Manufactured to match Porsche’s original spec.
Fits:
Porsche 911 1965 - 1974
Porsche 911 1975 - 1977 Engines 911/41/42/46/47/83
Porsche 914-6 1970 - 1976
Diagram ref no 11
• Position on Vehicle: Fan/generator drive assembly – pulley half mounted on alternator/fan hub, forming part of the V-belt drive.
• Function: Provides the correct sheave geometry for the V-belt that drives the alternator/generator and cooling fan; ensures proper belt tension, belt contact interface and belt stability under engine load.
• Applications: Ideal when the original pulley half shows signs of corrosion, rust, flange damage, belt mis-tracking, belt wear or vibration due to pulley run-out.
While seemingly small, the alternator/fan drive pulley plays a vital role in engine accessory drive functionality. A worn, corroded or mis-aligned pulley can lead to:
• Belt slippage or chatter under load
• Excessive belt wear or fraying
• Vibration, noise or resonance in the belt drive
• Reduced alternator or cooling system efficiency
Replacing this pulley half restores correct belt path and geometry, eliminates abnormal drive noise/vibration and helps preserve the longevity of the belt and driven accessories.
When to replace:
• Visible corrosion, rust or 'bite-marks' on the pulley surface
• Belt bounce or vibration at idle or under load
• Belt skipping or fraying on one edge
• You’re performing a drive-belt service or replacing the fan/generator assembly in a classic Porsche
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90160342101
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Generator Pulley Hub
The OE
Match Generator Pulley Hub is a replacement component designed for the
generator pulley assembly fitted to classic Porsche 356 and 912 engines.
Fits:
- Porsche 911 1965-1968 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram ref no 11
The hub supports correct pulley mounting and alignment, helping maintain reliable belt-driven operation of the generator and engine cooling fan.
What Does It Do?
The generator pulley hub provides the mounting connection between the generator shaft and pulley assembly, helping maintain correct positioning and drive-belt alignment.
Why Does It Fail?
Common
causes include:
- Wear around the mounting surfaces
- Corrosion and age-related deterioration
- Damage from incorrect installation
- Excessive vibration or pulley misalignment
- Wear caused by loose fastening components
When Should It Be Replaced?
Replace if the hub shows excessive wear, cracking, deformation or damage that prevents secure pulley mounting.
Inspect the hub whenever the generator pulley is removed or when investigating pulley wobble and abnormal belt wear.
Checks & Installation
Inspect the generator shaft, pulley halves and associated fastening hardware for damage.
Ensure the hub is correctly seated and the pulley runs true. Adjust belt tension according to the relevant Porsche workshop instructions.
Key
Features
- OE Match replacement generator pulley hub
- Designed for classic Porsche generator assemblies
- Supports correct pulley positioning
- Helps maintain drive-belt alignment
- Suitable for engine servicing and restoration
Porsche 356 & 912 Generator Pulley Parts
The generator pulley assembly is essential to the belt-driven charging and cooling systems of classic Porsche 356 and 912 engines.
Replacing a worn generator pulley hub helps maintain correct pulley alignment and dependable operation of the generator and cooling fan.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
54709311
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Maintain correct alternator and cooling fan belt operation with this OE Match Inner Generator Pulley Half, manufactured as a direct replacement. Produced to OE-style specifications, this pulley half forms part of the generator pulley assembly, providing the correct belt alignment and tension when used with the matching outer pulley half and shims.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram Ref No 7
Over time, the original pulley half can become worn, scored, distorted, or corroded through continual belt contact, heat, and engine vibration. Damage or wear can prevent the drive belt from seating correctly, resulting in belt slip, excessive wear, charging issues, or reduced cooling fan performance. Replacing a worn pulley half restores proper belt alignment and reliable operation of the generator and cooling fan drive. This OE Match component is ideal for routine maintenance, engine repairs, and Porsche restoration projects.
What This Product Does:
- Forms part of the generator pulley assembly.
- Supports correct drive belt alignment.
- Helps maintain accurate belt tension when used with the appropriate shims.
- Drives the generator and engine cooling fan.
- Reduces the risk of belt slip and premature belt wear.
- Replaces worn or damaged original pulley halves.
- Provides an OE-style fit and dependable quality.
Symptoms Of Wear Or Failure:
- Scored or worn pulley grooves.
- Corrosion or pitting on the pulley surface.
- Bent or distorted pulley half.
- Drive belt slipping or squealing.
- Uneven or accelerated belt wear.
- Difficulty maintaining correct belt tension.
- Visible damage affecting pulley alignment.
Why Replacement Matters:
- The inner generator pulley half is a critical component of the generator and cooling fan drive system, ensuring the drive belt runs true and maintains the correct tension. A worn or damaged pulley half can cause belt misalignment, slipping, increased belt wear, reduced charging efficiency, and compromised engine cooling.
- Replacing the inner generator pulley half restores proper belt alignment and dependable operation of the generator and cooling fan, helping to protect the charging and engine cooling systems from unnecessary wear. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match component provides the correct fit, dependable quality, and long-lasting durability, making it an excellent choice for Porsche maintenance, engine repairs, and restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
53909315
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Inner Generator Pulley Nut
The OE Match Inner Generator Pulley Nut is a
replacement fastening component for the generator pulley assembly fitted to
classic Porsche 356 and 912 models.
Fits:
- Porsche 911 1965-1968 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram ref no 11
Designed to replace a worn, damaged or missing original component, it helps maintain secure assembly of the generator pulley and supports reliable operation of the engine's belt-driven accessories.
Check the original pulley assembly and part number before ordering.
What Does It Do?
The inner generator pulley nut forms part of the pulley fastening arrangement, helping secure the components that transmit drive from the crankshaft to the generator and cooling fan.
Why Does It Fail?
Common causes include:
- Damaged or stripped threads
- Corrosion and age-related deterioration
- Incorrect tightening during servicing
- Wear from repeated removal
- Damage caused by incorrect tools
When Should It Be Replaced?
Replace if the nut has damaged threads, corrosion or visible deformation, or if it cannot be secured correctly.
Inspect the fastening components whenever the generator pulley or drive belt is removed.
Checks & Installation
Check the condition of the pulley, shaft threads and associated fastening components before fitting.
Ensure correct pulley alignment and belt tension, following the appropriate Porsche workshop instructions.
Key
Features
- OE Match replacement fastening component
- Porsche part reference 54709303
- Designed for classic generator pulley assemblies
- Replaces damaged or missing original hardware
- Suitable for engine servicing and restoration
Porsche 356 & 912 Generator Pulley Parts
The generator pulley assembly is an important part of the belt-driven charging and cooling system fitted to classic Porsche engines.
Maintaining the correct pulley fasteners helps ensure secure operation and prevents problems caused by damaged or incorrectly fitted components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
54709303
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Maintain reliable generator and cooling fan performance with this OE Match Outer Generator Pulley Half, manufactured as a direct replacement. Produced to OE-style specifications, this outer pulley half works together with the inner pulley half and adjustment shims to provide the correct drive belt alignment and tension, ensuring efficient operation of the generator and engine cooling fan.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram Ref No 8
Over time, the original pulley half can become worn, scored, distorted, or corroded through continuous belt contact, heat cycles, and engine vibration. A damaged pulley can prevent the belt from running correctly, leading to belt slip, excessive belt wear, reduced charging performance, or compromised engine cooling. Replacing a worn outer pulley half restores correct belt positioning and dependable operation of the drive system. This OE Match component is ideal for routine maintenance, engine repairs, and Porsche restoration projects.
What This Product Does:
- Forms part of the generator pulley assembly.
- Works with the inner pulley half to secure the drive belt.
- Helps maintain correct drive belt alignment and tension.
- Drives the generator and engine cooling fan.
- Reduces the risk of belt slip and premature belt wear.
- Replaces worn or damaged original pulley halves.
- Provides an OE-style fit and dependable quality.
Symptoms Of Wear Or Failure:
- Scored or worn pulley contact surfaces.
- Bent or distorted pulley half.
- Corrosion or pitting on the pulley.
- Drive belt squealing or slipping.
- Excessive or uneven belt wear.
- Difficulty achieving correct belt tension.
- Visible pulley damage affecting belt alignment.
Why Replacement Matters:
- The outer generator pulley half is an essential component of the generator and cooling fan drive assembly, ensuring the drive belt is correctly positioned and tensioned for efficient operation. A worn or damaged pulley can cause belt misalignment, slipping, accelerated belt wear, reduced charging efficiency, and diminished cooling fan performance.
- Replacing the outer generator pulley half restores proper belt alignment and reliable operation of both the generator and engine cooling fan, helping to protect the charging and cooling systems from unnecessary wear. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match component provides the correct fit, dependable quality, and long-lasting durability, making it an excellent choice for Porsche maintenance, engine repairs, and restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
53909316
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Fits:
Porsche 911 1965-1973
Porsche 914 1970-1973
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90160342702
The product you are viewing cross references to these numbers
- 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 914 (1970-1976)
OE Match tensioning cap for selected Porsche 911, 912 and 914 Motorola alternator applications. Supplied diagram information also identifies use on specified 911 Turbo assemblies.
Fits
- Porsche 911 1965-81
- Porsche 912 1965-70
- Porsche 914-6 1969-73
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no: 11
What This Product Does
This is the tensioning cap used within the specified alternator or generator pulley assembly. It is a separate mechanical component, rather than a complete alternator, voltage regulator or belt.
Technical Details
- Part reference: 90160342803.
- Brand: OE Match.
- Motorola generator identification appears in the supplied 911 1965–69, 911 1970–73 and 914-6 diagrams.
- CAL exclusions apply to the specified 1974–77 and Turbo 1975–77 diagram applications.
Symptoms of Fault
Loose pulley hardware, belt squeal, vibration or visible pulley wobble warrant inspection of the pulley assembly. These symptoms do not establish that the tensioning cap itself is faulty; belt condition, alignment and adjoining components also need checking.
Why Replacement Matters
Renewing damaged or worn pulley hardware can form part of an alternator repair or classic Porsche restoration. Match the cap to the installed generator and inspect the surrounding assembly rather than selecting it by vehicle model alone.
FAQs
- Will this fit every alternator on the listed vehicles?
No universal compatibility is stated. Confirm the generator identification, part reference and applicable diagram notes. - Does a charging fault mean this cap needs replacing?
No. Charging problems require diagnosis; inspect the belt drive, battery, wiring and earth connections before choosing replacement parts. - What should be checked during pulley work?
Inspect belt condition, pulley alignment, retaining hardware and alternator bearing condition.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90160342803
The product you are viewing cross references to these numbers
-
air cooling 911 1978-83 105-00
-
air injection 911 SC 1978-83 108-00
-
air cooling 911 1970-73 105-00
-
generator starter 911 1978-83 902-05
-
air cooling 911 1987-89 105-00
-
air injection 911 CARRERA 930.26 1987-89 108-00
-
accessories 911 1978-83 001-00
-
air cooling 911 1984-86 105-00
-
Air injection 911 CARRERA 930.26 (AUS) (CH) (S) 1984-86 108-00
-
Tool, jack, stickers 911 1984-86 001-00
-
tool, jack 911 1987-89 001-00
-
Air Cooling 911 1974-77 105-00
-
Air injection 911 1977 ONWARDS (JAPAN) 108-00
-
Generator 911 1974-77 902-10
-
air cooling 911 1965-69 105-00
-
air cooling, air duct and engine cover for (S)(D) 912 1965-69 105-10
-
air cooling, air duct and engine cover not for (S)(D) 912 1965-69 105-15
-
engine electrics 911 1965-69 901-00
-
engine electrics 912 1965-69 901-05
-
air cooling 911 TURBO 1975-77 105-00
-
generator 911 TURBO 1975-77 902-10
OEMatch Alternator Pulley / Pulley Nuts — Fit, Function, Confidence
OEMatch alternator pulleys and pulley nuts for Porsche models support the alternator drive by transferring torque from the engine belt to the alternator shaft. Correctly matched pulleys and secure nuts reduce belt slip, damp vibration and help maintain stable charging and accessory power under varied driving conditions.
Available Types
- One-way decoupler pulley
- Fixed solid pulley
- Pulley nut with locking washer
Understanding OEMatch Alternator Pulley / Pulley Nuts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original alternator pulleys and pulley nuts. OE (Original Equipment) refers to parts matching original specifications for the alternator pulleys and pulley nuts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM alternator pulleys and pulley nuts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
These components sit on the alternator shaft and interface with the serpentine or accessory belt, using bearings or decoupler mechanisms to maintain smooth rotation. Common symptoms of wear include belt squeal, visible wobble, reduced charging output and illumination of the battery or charging warning lights. OEMatch catalogs over 4,000 individual part numbers and over 8,700 OE cross-references and continues developing new lines to keep Porsche vehicles on the road.
Benefits Include
- Consistent charging and electrical reliability
- Reduced belt wear, noise and vibration
- Improved rotational balance and component life
Why Alternator Pulley / Pulley Nuts Wear and Fail
- Bearing fatigue or internal corrosion leading to rough rotation
- Seizure or failure of one-way decoupler mechanisms
- Belt misalignment or over-tensioning accelerating wear
- Contamination from oil, dirt or road debris affecting balance
The Importance of Replacing with OEMatch Alternator Pulley / Pulley Nuts
Replacing worn pulleys and pulley nuts avoids belt failure and potential alternator damage, restoring stable charging and preventing accessory faults. Timely renewal during belt or alternator service preserves drive alignment and reduces the risk of secondary failures. OEMatch parts are drawn from original specifications where applicable and are offered to support correct fitment on Porsche models.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Fits original mounting points and clearances for straightforward installation
- Compatible with factory systems and sensors where applicable
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. If the vehicle includes hidden sensors or you are unsure of the procedure, seek professional help and verify correct alignment and fixing points during installation.
