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Porsche // 993 (911) (1994-1998) // 993 (911) C4 1994-97
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- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 997.1 Turbo / GT2 2007-09
Porsche 997 GT2 RS 2010-13
Diagram ref. 22.
NOTE: Our product image shows 99760703100, which is the wiring harness used for models with a manual transmission.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760703
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Fits:
Porsche 964 C2 / C4 1989-94
Porsche 993 C2 / C4 / C2S / C4S 1994-98
- 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) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- 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) RS 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
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Fits:
Porsche 924 1982-85
Porsche 924S 1986-88
Porsche 928 1987-95
Porsche 944 1982-91
Porsche 968 1992-95
Porsche 964 1989-94
Porsche 993 1994-98
Diagram ref no 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860314201
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) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- 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) RS 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 96410651102, 93010650900, 93010651000,
Fits:
Porsche 964 1989-94
Porsche 993 1995-98
CNC machined from 7075 aircraft alloy and hard anodized for wear. These pulleys are half the weight of the factory part, spin true and make an awesome appearance upgrade.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
RS-164B
The product you are viewing cross references to these numbers