Alternator / Generator

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

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96410605131

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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.

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96410605131

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Alternator fan / impeller housing strap.
Genuine Porsche alternator fan / impeller housing strap for 911 (993). Ensures secure fit, proper alignment, and reliable cooling performance.

Fit:
Porsche 993 Turbo 1994 - 1997

Diagram ref no 6

Location: Engine bay, securing the alternator fan / impeller housing  

What this product does:
•  Holds the alternator fan and impeller housing firmly in place
•  Ensures proper cooling airflow through the engine
•  Maintains alignment of the fan assembly to avoid vibration or damage

Over time, the original strap may stretch, corrode, or lose strength, reducing its ability to hold the housing firmly in place. A failing strap can cause the fan assembly to loosen, resulting in noise, vibration, or poor cooling performance. Replacing it restores secure fitment and proper tension, ensuring your Porsche’s cooling system continues to operate efficiently.

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99310625150

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Alternator fan / impeller housing strap
Direct replacement alternator fan and impeller housing strap for Porsche 911 (993) models. This strap secures the alternator fan and housing assembly in place, ensuring proper alignment and reliable cooling performance. Built to OE specifications, it matches the fit and strength of the original part while offering excellent durability.

Fit:
Porsche 993 turbo - 1994 to 1997

Diagram ref no 6

Location: Engine bay, securing the alternator fan / impeller housing  

What this product does:
•  Holds the alternator fan and impeller housing firmly in place
•  Ensures proper cooling airflow through the engine
•  Maintains alignment of the fan assembly to avoid vibration or damage

With age, the original strap can weaken, stretch, or corrode, making it less effective at securing the housing. If it fails, the fan assembly may loosen, leading to unwanted noise, vibration, or reduced cooling efficiency. Replacing the strap ensures a secure fit and proper tension, keeping your Porsche’s cooling system performing as intended.

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99310625150

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Alternator Fan / Impeller.

Fits:
Porsche 964 Turbo 1989-94
Porsche 993 Turbo 1994-98

Old Porsche part number:
- 96410601521

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96410601522

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High output, 300 Series, 180 amp alternator. 

Fits:
Porsche 964 1989-94
Porsche 993 1994-98

300 Series WOSP Alternators
The WOSP 300 Series represents our latest-generation alternator technology, designed for maximum efficiency and performance. These advanced units use square wire ‘hairpin’ (segment conductor) stators, delivering exceptional current density and allowing much higher output compared to traditional designs.

Each alternator case is precision-machined in-house from billet aluminium, ensuring strength, durability, and a perfect fit. The result is a range of plug-and-play alternators built to outperform standard OEM units while maintaining easy installation.

Key Features

• Advanced hairpin stator technology for superior efficiency
• Precision billet housings manufactured in the UK
• Wide range of direct-fit, plug-and-play applications

• Weight: 6.9kg
•   Amp: 180
• Connections: B+ / Lamp
• Construction: Full Billet
• All units are produced to BSI ISO 9002 standards.
• All units have their own serial number for traceability.

Fits engines: M64.01 / M64.02 / M64.03 / M64.05 / M64.06 / M64.07 / M64.08 / M64.20 / M64.21 / M64.05S / M64.06S

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96460315601

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High output 240 amp 300 Series alternator. Porsche 964 / 993

Fits:
Porsche 964 1989-94
Porsche 993 1994-98

300 Series WOSP Alternators
The WOSP 300 Series represents our latest-generation alternator technology, designed for maximum efficiency and performance. These advanced units use square wire ‘hairpin’ (segment conductor) stators, delivering exceptional current density and allowing much higher output compared to traditional designs.

Each alternator case is precision-machined in-house from billet aluminium, ensuring strength, durability, and a perfect fit. The result is a range of plug-and-play alternators built to outperform standard OEM units while maintaining easy installation.

Key Features

• Advanced hairpin stator technology for superior efficiency
• Precision billet housings manufactured in the UK
• Wide range of direct-fit, plug-and-play applications

• Weight: 6.9kg
• Amp: 240
• Connections: B+ / Lamp
• Construction: Full Billet
• All units are produced to BSI ISO 9002 standards.
• All units have their own serial number for traceability.

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96460315601

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Alternator pulley spacer.

Fits:
Porsche 964 3.6L  M64.01 / 64.02 Engines
Porsche 993 1995-08

Diagram ref no 17

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96410621133

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Fits:
Porsche 964 1989-94
Porsche 993 1994-98

Reconditioned Alternators are sold on an exchange basis, A surcharge will be held and then refunded when the old one is returned.

Select below please.

PLEASE NOTE:

• The surcharge for this reconditioned part will be refunded when the exchange unit is received and approved by us and the relevant manufacturer.
• Please note, surcharge refunds often take an average of 6 to 8 weeks to be approved by the manufacturer.
• Acceptance of the exchange part is at the manufacturer's discretion, based on the part being fit for reconditioning.
• All surcharges and exchanges are subject to our terms and conditions.

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96460315601

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Alternator. Porsche 964 / 993 

Fits:
Porsche 964 1989-94
Porsche 993 1994-98

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96460315601

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Billet aluminium black fan pulley half for single belt hub conversions. 

Fits:
Porsche 964 1989-94
Porsche 993 1995-98

Replacement for Porsche OE numbers 96410651102, 93010650900, 93010651000,

The single fan belt aluminum pulley is a compact and lightweight component designed to efficiently transfer power from the engine to the cooling fan. Its sleek aluminum construction ensures durability while reducing overall weight, allowing for improved engine performance and enhanced fuel efficiency. With its streamlined design, this pulley delivers reliable and smooth operation, contributing to the optimal functioning of the cooling system.

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3609001604

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Billet aluminium black fan pulley half.

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.

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RS-164B

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Mount plate for alternator fan belt senor.

Fits:
Porsche 964 1989-94
Porsche 993 1995-98

Diagram ref no 2

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96410631502

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Pin for alternator fan housing strap.
Sold each - 2 required per car

Fits:
Porsche 964 Carrera 2 / 4 / RS 3.6L 1989-94
Porsche 993 1994-98

Diagram ref no 8

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96410627302

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Billet aluminium RS conversion fan hub.
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.

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99310605180

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Voltage regulator for alternator.

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

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92860314201

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