Air deflector alternator. Porsche 911 1975-83

Air deflector alternator. 
The air deflector serves as an air baffle and provides optimal cooling of the cylinders. Bolts to the back of the alternator.

Fits:
Porsche 911 - 1975 to 1977
Porsche 911 SC - 1978 to 1983

Diagram ref no 10

Mounted on the rear of the alternator or alternator hub, bolting into or adjacent to the fan housing / ventilation shroud.

What it does:
• Guides airflow from the cooling fan over the alternator and engine to maintain proper cooling
• Extends or positions the alternator hub correctly so pulleys are aligned and belt tension is correct
• Helps ensure consistent air circulation in the engine cooling system

Over time, deflectors or hub extensions can become warped, cracked, or corroded, compromising airflow and misaligning pulleys. A damaged deflector may lead to poor alternator cooling, reduced alternator lifespan, or belt misalignment. Replacing restores correct spacing, airflow direction, and ensures reliable alternator performance under all conditions.

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Related, superseded, cross reference or alternative numbers for comparison.

91110603305

The product you are viewing cross references to these numbers