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Gasket Sets / Gaskets / Seals / Lock Nuts
By OE Match
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
The OE Match Oil Seal for Mainshaft is a high-quality replacement sealing component designed to prevent gearbox oil from escaping around the transmission mainshaft. Manufactured to OE specifications, this precision-engineered seal provides a secure barrier between rotating transmission components and the gearbox housing, helping to maintain correct lubrication and protect against fluid loss.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55Porsche 356A 1955-59
- Porsche 356B 1959-63Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Constructed from durable oil-resistant materials, the seal is designed to withstand continuous shaft rotation, temperature fluctuations and long-term exposure to transmission oil. It is an essential service item during gearbox repairs, rebuilds and preventative maintenance.
What This Product Does:
- Prevents gearbox oil from leaking around the mainshaft.
- Maintains proper lubrication within the transmission.
- Protects gearbox components from oil loss.
- Prevents dirt, moisture and contaminants from entering the gearbox.
- Supports reliable transmission performance and longevity.
- Helps maintain correct gearbox oil levels.
Symptoms Of Wear Or Failure:
- Gearbox oil leaks beneath the vehicle.
- Oil residue around the transmission housing or shaft area.
- Gradual loss of gearbox oil.
- Difficulty maintaining correct transmission fluid levels.
- Contamination of surrounding components with oil.
- Increased transmission noise caused by reduced lubrication.
- Premature wear of gearbox bearings and internal components.
- Burning oil smells if leaking oil contacts hot surfaces.
Why Replacement Matters:
- Mainshaft oil seals are subjected to constant shaft rotation, vibration, heat and prolonged exposure to transmission oil. Over time, the sealing lip can harden, wear or lose elasticity, reducing its ability to maintain an effective seal.
- A leaking oil seal can allow gearbox lubricant to escape, potentially reducing lubrication to critical internal components. If left unresolved, low oil levels can accelerate wear of gears, bearings and synchronisers, leading to costly transmission repairs or rebuilds.
- Replacing a worn mainshaft oil seal helps preserve correct gearbox lubrication, prevents oil leaks and protects internal transmission components from premature wear. An OE Match replacement restores the integrity of the gearbox sealing system and helps ensure reliable long-term transmission performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
113311113B
The product you are viewing cross references to these numbers
OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts — Fit, Function, Confidence
For Porsche models, OEMatch supplies gasket sets, seals and lock nuts intended to protect gearboxes and differentials from lubricant loss and contamination while preserving correct internal clearances and pressure. These items are useful for routine service, gearbox rebuilds and resolving persistent transmission leaks.
Available Types
- Complete gearbox and differential gasket sets for rebuilds
- Individual shaft seals, O-rings and grommets
- Lock nuts and transmission fastener kits
Understanding OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gasket sets, gaskets, seals and lock nuts.
OE (Original Equipment) refers to parts matching original specifications for the gasket sets, gaskets, seals and lock nuts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gasket sets, gaskets, seals and lock nuts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Gaskets and seals create pressure-tight joints between mating gearbox surfaces and around rotating shafts; lock nuts and fastening kits secure components subject to high torque and vibration. Correct material selection and surface condition are essential to maintain sealing performance, particularly where high temperature and exposure to transmission fluids can accelerate degradation. OEMatch integrates a broad catalogue of Porsche part references to help match application requirements.
Benefits Include
- Restores reliable oil containment to prevent leaks
- Preserves gearbox pressure and lubrication pathways
- Reduces the risk of internal wear and noise from fluid loss
Why Gasket Sets / Gaskets / Seals / Lock Nuts Wear and Fail
- Thermal cycling causing shrinkage, cracking or compression set of gasket materials
- Chemical attack or hardening of seals from aged or contaminated fluids
- Damaged or corroded mating surfaces created during service or by debris
- Incorrect installation or re-use of old sealing materials and fasteners
The Importance of Replacing with OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts
Replacing worn or damaged sealing components prevents lubricant loss, contamination and consequential gearbox damage. Renewing gaskets, seals and lock nuts during a rebuild or major service restores designed sealing points and fastener security, helping to maintain smooth, reliable transmission operation and reducing the likelihood of repeat repairs.
Advantages
- Materials chosen for compatibility with transmission fluids and operating temperatures
- Restores intended sealing clearances and assembly torque behaviour
- Facilitates thorough gearbox servicing and long-term reliability when fitted correctly
