Oil seal for mainshaft. Porsche 356 / 911 / 914  ❭  113311113B

Oil Seal For Mainshaft.
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.

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113311113B

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