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Gearbox Casing / Casing Parts
By OE Match
- 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
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911318540
The product you are viewing cross references to these numbers
OEMatch Gearbox Casing / Casing Parts — Engagement, Smoothness, Control
OEMatch gearbox casings and casing parts for Porsche models provide the structural housing and sealing surfaces that support gears, shafts and bearings. These items are specified for correct alignment, oil containment and thermal stability to help maintain transmission operation across road and competition use.
Available Types
- Full gearbox casings in aluminium and magnesium
- Case covers and extension housings
- Sealing surfaces, gaskets and oil seals
Understanding OEMatch Gearbox Casing / Casing Parts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gearbox casings and casing parts. OE (Original Equipment) refers to parts matching original specifications for the gearbox casings and casing parts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gearbox casings and casing parts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OEMatch also catalogues over 4,000 part numbers and more than 8,700 OE cross-references to support repairs across Porsche generations. The casing itself is the structural foundation of a Porsche transmission: it locates bearings and shafts, supports gearsets, retains lubricant and helps control operating temperature.
Benefits Include
- Structural support and precise alignment of internal gearbox components
- Reliable sealing to prevent oil loss and contamination
- Improved heat dissipation and resistance to distortion
Why Gearbox Casing / Casing Parts Wear and Fail
- Cracks or fractures from impact, fatigue or over-torqued fasteners
- Corrosion or oxidation, particularly with older magnesium parts
- Warping or distortion due to overheating or thermal cycling
- Damaged sealing faces or degraded gaskets leading to leaks
The Importance of Replacing with OEMatch Gearbox Casing / Casing Parts
Replacing a damaged or worn gearbox casing restores structural integrity, corrects alignment and prevents oil leaks that would otherwise accelerate wear on gears and bearings. For Porsche transmissions, correct mating surfaces and sealing are essential to maintain lubrication, reduce vibration and preserve gear engagement. During rebuilds or when repairing impact damage, a suitable replacement casing helps retain original clearances and supports long-term drivetrain function.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Manufactured from materials and processes suited to transmission loads and thermal demands
- Coverage that includes classic and later Porsche models to support rebuilds and repairs
Support & Advice
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. Check alignment and sealing surfaces during assembly and confirm correct oil type and level after refit. If you are unsure about specific assembly steps, seek professional installation.
