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cover Genuine Porsche part 90150407900

Code: 90150407900

Genuine Porsche part

cover

The product code 90150407900 was also found on these diagrams

801-35 - spring cover

exterior panelling rear it is necessary to rework 911 1978-83

801-35 - spring cover

exterior panelling rear (it is necessary to rework) 911 COUPE 1984-86

801-30 - spring cover

exterior panelling 911 1970-73 COUPE

801-35 - spring cover

Exterior panelling rear (it is necessary to rework) 911 1974-77

801-30 - spring cover

exterior panelling 911 COUPE 1965-69

801-35 - spring cover

exterior panelling rear 911 TURBO 1975-77

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

3 3 3

Torsion bar cover. Porsche 911 1965-86 915 gearbox

90150407900/1

Product Information

Torsion Bar Cover with Gasket - fits Left or Right Hand Side
Sold each - 2 required per car

Restore factory appearance and protect key rear suspension areas with this OE Match Torsion Bar Cover for Porsche 911 models from 1965 to 1986 fitted with the 915 gearbox. This cover is fitted around the torsion bar access area and helps protect the torsion bar tube and surrounding bodywork from dirt, moisture, road debris and corrosion.

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

Diagram ref no 28

The torsion bar system is a vital part of the classic Porsche 911 rear suspension design. The cover helps close and protect the access point used for torsion bar servicing and adjustment, preserving both the structure and appearance of the vehicle.

Over time, original covers can corrode, become damaged, distort or go missing during previous repairs. Replacing worn or damaged covers helps improve protection, restoration quality and long-term durability.

What Does a Torsion Bar Cover Do?

The torsion bar cover protects the torsion bar access area and surrounding rear suspension structure.

Its main functions include:

Protecting the torsion bar access point
Helping shield suspension components from road debris
Reducing dirt and moisture exposure
Supporting factory-correct body appearance
Helping prevent corrosion around the torsion tube area
Providing access for torsion bar servicing when removed

Why Do Torsion Bar Covers Fail?

Torsion bar covers are exposed to road spray, moisture, dirt and age-related corrosion.

Common causes of failure include:

Rust and corrosion
Stone impact damage
Poor previous repairs
Distortion during removal
Missing or seized fixing hardware
Long-term exposure to road salt and moisture
General age-related deterioration

When Should It Be Replaced?

Replacement is recommended when the cover is damaged, corroded or missing.

Common signs include:

Visible rust
Damaged or distorted cover
Missing cover plate
Poor fitment
Corrosion around fixing points
Restoration or repainting work
Rear suspension or torsion bar servicing

Why Replacement Matters

A damaged or missing torsion bar cover can leave the suspension access area exposed to moisture and debris.

Benefits of replacement include:

Restores factory appearance
Helps protect rear suspension areas
Reduces corrosion risk
Improves restoration quality
Supports long-term body protection
Ideal during torsion bar or suspension servicing

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

90150407900

90150407900

The product you are viewing cross references to these numbers

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

90150475901/8

Product Information

Torsion Bar Cover Gasket - fits Left or Right Hand Side
Sold each - 2 required per car

Maintain the integrity and protection of your classic Porsche suspension system with this OE Match Torsion Bar Cover Gasket. Designed for Porsche 911 models from 1965 to 1986 fitted with the 915 gearbox, this gasket sits between the torsion bar cover and the vehicle body, helping to create a protective seal around the torsion bar access area.

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 34

Although small and often overlooked, the torsion bar cover gasket plays an important role in preventing moisture, dirt, road debris and contaminants from entering the torsion bar housing area. By helping to seal the cover correctly, it contributes to the long-term preservation of the suspension components and surrounding body structure.

Ideal for restoration projects, suspension overhauls and routine maintenance, replacing the gasket whenever the torsion bar cover is removed helps maintain factory levels of protection and fitment.

What Does a Torsion Bar Cover Gasket Do?

The torsion bar cover gasket creates a sealing barrier between the torsion bar cover and the body shell.

Its primary functions include:

Helping prevent moisture ingress
Reducing dirt and debris contamination
Protecting torsion bar components
Supporting corrosion prevention
Improving cover fitment
Reducing water retention around the torsion tube area
Maintaining factory sealing standards

The gasket helps ensure the torsion bar access area remains protected from environmental exposure.

Why Do Torsion Bar Cover Gaskets Fail?

Over time, rubber, cork or gasket materials naturally deteriorate due to age and environmental conditions.

Common causes of failure include:

Age-related hardening
Compression over time
Moisture exposure
Heat cycling
Damage during removal
Corrosion around mounting surfaces
Long-term environmental exposure
Restoration work requiring removal

Once compressed or damaged, the gasket can lose its ability to seal effectively.

When Should the Gasket Be Replaced?

The gasket should always be inspected whenever the torsion bar cover is removed.

Replacement is recommended when:

Performing suspension repairs
Replacing torsion bars
Carrying out restoration work
The gasket shows signs of cracking
The gasket becomes compressed or flattened
Water ingress is visible
Corrosion is present around the cover
The original gasket is missing

Many Porsche specialists automatically replace these gaskets during suspension refurbishment projects.

Why Replacement Matters

A worn or damaged gasket can allow moisture and contaminants to enter the torsion bar housing area.

Benefits of replacement include:

Improved sealing performance
Better protection against moisture
Reduced corrosion risk
Protection of suspension components
Improved restoration quality
Correct cover fitment Long-term durability
Restoration of factory standards

Replacing the gasket is a simple and cost-effective way to help preserve the rear suspension structure of your classic Porsche.

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

90150475901

90150475901

90150407900

The product you are viewing cross references to these numbers

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cover Genuine Porsche part 90150407900