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Alternator Pulley / Pulley Nuts
By OE Match
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 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
Alternator Fan Bearing
Maintain the reliability of your Porsche's charging and
engine cooling systems with this OE Match Alternator Fan Bearing,
suitable for Porsche 964 and Porsche 993 models. This precision-engineered
bearing supports the alternator and engine cooling fan assembly, ensuring
smooth operation while allowing the cooling fan to rotate efficiently at high
engine speeds.
Fits:
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 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
Diagram ref no 25
On air-cooled Porsche engines, the engine cooling fan is one of the most critical components for temperature control. The alternator fan bearing allows the fan and alternator assembly to rotate freely while supporting the loads generated by the fan belt and engine speed. A worn or failing bearing can lead to excessive noise, reduced cooling efficiency and, in severe cases, catastrophic damage to the fan and alternator assembly.
Manufactured to OE Match standards, this replacement bearing is ideal for preventative maintenance, engine rebuilds and alternator refurbishment projects.
What Does the Alternator Fan Bearing Do?
The alternator fan bearing is located within the alternator and cooling fan assembly.
Its primary functions include:
- Supporting the alternator shaft
- Allowing smooth fan rotation
- Maintaining fan alignment
- Reducing friction within the assembly
- Supporting high engine speed operation
- Ensuring efficient engine cooling
- Helping maintain charging system reliability
Because the engine cooling fan is directly driven by the crankshaft belt system, the bearing operates continuously whenever the engine is running.
Why Do Alternator Fan Bearings Fail?
Over time, bearings are subjected to significant mechanical loads and temperature fluctuations.
Common causes of failure include:
- Age-related wear
- High mileage operation
- Heat cycling
- Bearing grease degradation
- Contamination from dust and debris
- Excessive belt tension
- Corrosion
- Long-term vibration
As the bearing wears, internal clearances increase and smooth operation deteriorates.
Symptoms of a Worn Alternator Fan Bearing
Common warning signs include:
- Whining or rumbling noises from the fan housing
- Grinding sounds from the alternator area
- Fan vibration
- Excessive shaft play
- Reduced cooling fan efficiency
- Alternator noise
- Difficulty maintaining charging performance
- Visible bearing wear during inspection
Ignoring these symptoms can eventually result in bearing seizure and costly component damage.
When Should the Alternator Fan Bearing Be Replaced?
Replacement is recommended when:
- Rebuilding the alternator
- Refurbishing the cooling fan assembly
- Engine-out servicing is being carried out
- Bearing noise is present
- Excessive shaft play is detected
- Performing preventative maintenance
- Completing an engine rebuild
- Restoring a Porsche 964 or 993
Many Porsche specialists replace the bearing whenever the alternator assembly is removed for major servicing.
Why Replacement Matters
Replacing a worn fan bearing helps protect both the engine cooling system and charging system.
Benefits include:
- Smooth fan operation
- Improved cooling system reliability
- Reduced noise
- Improved alternator performance
- Protection against costly failures
- Better engine temperature management
- Long-term durability Enhanced reliability
For air-cooled Porsche engines, maintaining the cooling fan assembly is essential for engine longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410605131
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fit:
Porsche 964 Turbo 3.3L 1991-92
Porsche 964 Turbo 3.6L 1993-94
Diagram ref no 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010612402
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 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
Replacement for 96410605130, 96410605131, 99310605180.
Converts standard two belt system to single belt as used on factory RS models. Necessary fasteners are included.
Fits:
Porsche 964 1989-94
Porsche 993 1995-98
CNC machined from 6061 aircraft alloy and anodized gloss black.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310605180
The product you are viewing cross references to these numbers
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.
