Alternator fan pulley for cars with air injection. Porsche 911 SC / Carrera 1978-89 › 91110620803

This OE Match alternator fan pulley is for Porsche 911 models from 1978–89 equipped with air injection. It provides a replacement pulley for repairs involving wear or damage in the alternator and cooling-fan belt-drive assembly.

Fits

Porsche 911 1978–89 * WITH AIR INJECTION

• Porsche 911 1984–1986 3.2L
• Porsche 911 1987–1989 3.2L G50
• Porsche 911 1978–1983 3.0L / SC

Diagram Ref No 36

What Is This Part?
The pulley forms part of the belt-driven assembly associated with the engine cooling fan and alternator. Porsche's parts documentation places the pulley alongside the fan impeller, adjustment shims, tensioning cap, hub extension and retaining hardware. These components work together to locate and secure the pulley assembly while allowing the belt to run in its intended position. ()

For this application, the air-injection equipment is an important selection detail: match the replacement to the existing installation rather than choosing by model year alone.

What Does This Part Do?

• Provides a belt-running surface: Gives the drive belt a shaped contact surface through which rotational drive can be transmitted.
• Supports belt alignment: Works with the adjoining pulley components to keep the belt seated in its intended path.
• Forms part of the drive assembly: Operates with the pulley mounting and retaining components rather than functioning independently.

Why Replace This Part?
Replacement may be appropriate if inspection reveals worn belt-contact surfaces, cracking, distortion or damage around the mounting area. Such deterioration can prevent the pulley from seating correctly or contribute to uneven belt contact. Damage caused during previous removal or incorrect assembly should also be assessed before refitting.

A squealing belt or charging problem does not, by itself, establish that this pulley needs replacing. Check belt condition and tension, pulley alignment, retaining hardware and the condition of the associated rotating assembly. Replacing only the pulley will not resolve a fault caused elsewhere.

When to Replace This Part?

• Visible damage: Cracks, chips or distortion are found during inspection.
• Worn contact surfaces: The belt-running surface shows pronounced wear or damage.
• Poor seating: The pulley cannot sit correctly against its adjoining components after the mounting arrangement has been checked.
• Persistent belt wear: Fraying, uneven wear or belt dust prompts inspection and pulley damage is confirmed.
• Movement or noise: Wobble, looseness or abnormal noise warrants inspection of the pulley, fixings and bearings before deciding which parts need renewal.

Where Is This Part Fitted?
Location: At the alternator and cooling-fan pulley assembly in the rear engine compartment, associated with the belt-drive arrangement on cars equipped with air injection.

FAQs

• Will this fit a car without air injection?
  This product's stated application is for cars with air injection. Confirm the equipment fitted to the vehicle before ordering.
• Should the belt and retaining hardware be checked too?
  Yes. Inspect the belt, pulley seating, adjustment components and retaining hardware during the repair, replacing items where their condition or the applicable fitting procedure requires it.

Product Summary

• Product: Alternator fan pulley for cars with air injection.
• Brand: OE Match.
• Part reference: 91110620803.
• Associated application reference: 91110620800.
• Purpose: Replacement pulley for repair of the existing belt-drive assembly.

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

91110620803

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