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- 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 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 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
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