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Porsche > 993 (911) (1994-1998) > 993 (911) GT2 1994-97 > Engine Electrical > Alternator / Generator >

Alternator Fan / Impeller

Alternator Fan / Impeller

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Alternator bearing fan blade. Porsche 964 / 993 - 96410605130, 96410605131
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Alternator bearing fan blade. Porsche 964 / 993
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96410605131
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Alternator bearing fan blade

Fits:
Porsche 964 C2 / C4 / Turbo 1989-94
Porsche 993 C2 / C4 / C2S / C4S / Turbo 1995-98

Diagram ref no 25

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410605131
96410605130
96410605131

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Alternator bearing fan blade. Porsche 964 / 993 - 96410605130, 96410605131, 1265
4
Alternator bearing fan blade. Porsche 964 / 993
96410605131/1
Product Information
Product Information

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
96410605130
96410605131
1265

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
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About Alternator Fan / Impeller

Alternator Fans & Impellors for Effective Cooling and Long-Lasting Performance

Alternator fans and impellors are essential cooling components that regulate the temperature of the alternator or generator during operation. As the alternator produces electrical power, it generates heat—making efficient airflow and cooling critical for maintaining optimal charging performance. These fans are engineered to draw air through the alternator housing, prevent heat buildup, and protect sensitive internal components from thermal stress.

What Alternator Fans / Impellors Do

Alternator fans and impellors perform several essential functions:

  • Direct airflow across the alternator, reducing heat and extending component life
  • Maintain consistent charging performance by preventing overheating
  • Protect internal bearings, rectifiers and windings from thermal damage
  • Support high-output alternators that run under heavier electrical loads
  • Improve reliability in both standard and performance-oriented engines

Whether you are maintaining a classic model or upgrading a modern performance vehicle, an effective cooling fan is key to alternator longevity.

Why Alternator Fans & Impellors Fail

Despite being robust components, alternator fans can fail over time due to mechanical stress, environmental exposure and vibration.

Common causes include:

  • Metal fatigue from continuous heat cycles
  • Corrosion due to moisture, dirt and road contaminants
  • Cracked or bent blades from debris strikes or worn mounting surfaces
  • Loose fittings causing imbalance and vibration
  • Wear from high-output alternator upgrades that exceed the original cooling capacity

Faulty or weakened fans result in reduced airflow, causing the alternator to run hotter and less efficiently.

Why You Should Replace a Worn Alternator Fan / Impellor

A failing alternator cooling fan can lead to serious electrical system issues. Without proper airflow, the alternator may overheat, reducing charging performance and accelerating wear on internal components. Replacing the part with a high-grade, precision-built alternative engineered to match original performance standards ensures reliable cooling and prevents premature alternator failure.

Benefits of replacement include:

  • Restored cooling efficiency and airflow
  • Reduced alternator temperature under load
  • Prevention of internal overheating and electrical faults
  • Enhanced durability and component lifespan
  • Improved reliability for daily and performance driving

A quality alternator fan is a cost-effective safeguard against much more expensive charging system repairs.

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