Torsion bar cover gasket. Porsche 911 1965-86 915 gearbox › 90150475901

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90150475901

Product Information

Torsion bar cover gasket
The Genuine Porsche Torsion Bar Cover Gasket (Part Number: 90150475901) is an original equipment sealing component designed for classic Porsche 911, 912 and 930 models. This gasket fits between the rear torsion bar access cover and the vehicle body, creating a protective barrier against moisture, dirt and road debris. It helps protect the torsion bar housing and surrounding bodywork from contamination and corrosion.
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Fits:
Porsche 911 1965-1968 2.0L / 912 SWB (F)

Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera

Porsche 911 1978-1983 3.0L / SC

Porsche 911 1984-1986 3.2L

Porsche 911 1975-1977 3.0L Turbo (930)

Porsche 911 1978-1989 3.3L Turbo (930)

Diagram ref no 20

Manufactured to Porsche's original specifications, this genuine replacement gasket provides precise fitment and reliable sealing, making it an ideal choice for suspension maintenance, classic Porsche restoration and bodywork repairs.

What Does This Part Do? – Functions

Protective Sealing: Helps prevent moisture and dirt from entering the torsion bar housing area.
Corrosion Prevention: Reduces exposure to water and road contaminants.
Component Protection: Helps protect the rear torsion bar assembly and surrounding bodywork.
Secure Fitment: Provides a protective seal between the cover and vehicle body.
Original Specification: Maintains factory-correct sealing and fitment.

Why Replace This Part?

Over time, the torsion bar cover gasket can become brittle, compressed or damaged due to ageing, moisture and environmental exposure. A deteriorated gasket may allow water and debris to enter the torsion bar housing area, increasing the risk of corrosion.

Replacing it with a genuine Porsche gasket helps restore the protective seal, maintain original fitment and preserve the condition of the rear suspension housing.

When to Replace This Part?

Cracked Gasket: Visible splits, tears or deterioration.
Loss of Sealing: Flattened or compressed gasket material.
Water Ingress: Moisture or corrosion around the torsion bar cover.
Suspension Repairs: During torsion bar servicing or replacement.
Restoration Work: When removing or replacing rear torsion bar covers.

Where Does It Fit on the Car?

Location: Rear suspension – torsion bar access cover.

The gasket is installed between the rear torsion bar cover and the vehicle body, sealing the opening around the torsion bar housing.

It is suitable for installation on either the left-hand or right-hand side of the vehicle.

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

90150475901

90150475901

90150407900

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Your Vehicle // Porsche // 991 (911) MK2 2016-2019 // 991.2 Speedster 4.0L (510Bhp) 2019

Torsion bar cover gasket. Porsche 911 1965-86 915 gearbox › 90150475901