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Porsche 914 (1970-1976) Engine Electrical Alternator / Generator

Alternator Fan / Impeller

Alternator Fan / Impeller

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Alternator Fan / Impeller, 11-Blade. Porsche 911 / 912 / 914-6 - 90110601003
2
Alternator Fan / Impeller, 11-Blade. Porsche 911 / 912 / 914-6
Special Order item
90110601003
Product Information
Product Information

Porsche alternator fan / impeller for classic 911 and 912 applications, with additional 914-6 coverage.
This 11-blade fan measures 245mm across and has a pulley diameter of 3.75 inches.

Fits
Porsche 911/912 (1965-1969) (911 up Through 68)
Porsche 911T/E/S Carrera RS (1970-73)
Porsche 911/911S / Carrera (1974-1977)
Porsche 914-6 1970–76

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram reference number 6

What This Product Does

The rotating impeller supplies cooling airflow within the air-cooled engine assembly. It works with the surrounding housing and ducting; it is not an electrical generating unit or a replacement for the complete alternator.

Functions

  • Moves air through the cooling assembly.
  • Supports heat removal from engine components.
  • Replaces an impeller with damaged or distorted blades.

Technical Details

  • Part number: 90110601003.
  • Blade count: 11; fan diameter: 245mm; pulley diameter: 3.75 inches.

Symptoms of Fault

Reasons to inspect the fan include unusual vibration, scraping sounds, fractured blades, distortion or contact marks inside the housing. Higher engine or oil temperatures can also warrant a cooling-system inspection, but do not confirm an impeller fault on their own.

Why Replacement Matters

Renewing a damaged impeller addresses impaired airflow and mechanical imbalance. Before fitting a replacement, inspect the housing, mounting hardware, belt alignment and alternator bearings so that an underlying assembly fault is not left unresolved.

FAQs

What should be checked if the fan rubs?
Inspect assembly alignment, hardware security, spacing and housing condition rather than assuming the blades alone are responsible.

Does this replace the alternator?
No. This component is the fan / impeller; the diagrams identify the generator and housing separately.

How should suitability be confirmed?
Compare the vehicle details, engine references, fan dimensions and pulley specification with the existing assembly before ordering.



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

90110601003
90110601003

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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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