Oil seal for gear selector shaft. Porsche 911 / 912  ›  99911318540

Gear Selector Shaft Oil Seal

OE Match gear selector shaft oil seal for classic Porsche 911 and 912 manual gearboxes. Designed to replace a worn or leaking original seal, this component helps prevent transmission oil from escaping around the gear selector shaft where it passes through the gearbox housing.

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)
Porsche 912E 4CYL 1976
Diagram ref no 8

The seal provides a barrier between the moving selector shaft and gearbox casing, helping retain the correct transmission oil level and protecting the surrounding components from oil contamination.

What Does the Gear Selector Shaft Oil Seal Do?

The gear selector shaft transfers movement from the gear lever linkage into the gearbox, allowing the driver to select different gears.

The oil seal fits around this shaft and prevents gearbox oil from escaping while allowing the shaft to move during gear changes. A properly functioning seal helps maintain the transmission oil level and keeps the gearbox exterior clean and dry.

Why Does It Fail?

Over time, the sealing material can harden, shrink or lose flexibility due to age, heat and prolonged contact with transmission oil.

Common causes of failure include:

• Age-related deterioration of the sealing lip
• Hardened or cracked rubber
• Wear from repeated selector shaft movement
• Corrosion or damage to the shaft sealing surface
• Incorrect installation or previous gearbox repairs
• Excessive shaft movement or wear

As the seal deteriorates, transmission oil may begin to seep around the selector shaft.

When Should It Be Replaced?

A replacement may be required if you notice:

• Gearbox oil leaking around the selector shaft
• Oil collecting on the underside of the transmission
• Drips beneath the gearbox
• A persistent oily residue around the selector linkage
• A damaged or hardened seal during gearbox servicing

The seal should also be inspected whenever the gearbox selector mechanism is dismantled or the transmission is removed for restoration.

Checks During Replacement

Before fitting a new oil seal, inspect the selector shaft for corrosion, scoring or excessive movement. Check the gearbox breather and surrounding seals to ensure the leak has been correctly identified.

The new seal should be installed squarely and to the correct depth, without damaging the sealing lip or shaft surface.

Porsche 911 / 912 Gearbox Oil Seals & Transmission Components

Gearbox oil seals are essential for maintaining the correct lubrication of classic Porsche manual transmissions. The gear selector shaft oil seal prevents transmission oil from leaking where the selector shaft enters the gearbox housing.

On older Porsche 911 and 912 models, ageing seals can become brittle or worn, allowing gearbox oil to escape. Replacing a leaking seal helps protect the transmission against lubricant loss and prevents oil contamination around the gear linkage and gearbox casing.

OE Match seal is a 15 × 24 × 7 mm replacement selector shaft oil seal for selected Porsche 911, 912 and 930 Turbo manual gearboxes. It is particularly suitable for maintenance and restoration of classic Porsche transmissions.