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Crankshaft & Parts
By OE Match
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 912E 4CYL 1976
Crankshaft Oil Seal
Protect your classic Porsche engine from oil leaks with this Crankshaft Oil Seal. This
high-quality oil seal is manufactured to OE specifications, providing a
reliable seal around the crankshaft where it exits the engine casing.
Constructed from durable, oil-resistant materials, it is designed to withstand
high temperatures, engine oil and constant crankshaft rotation while delivering
long-lasting performance.
Fits:
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
-
Porsche 912E 4CYL 1976
Diagram ref no 47
Whether you're rebuilding an engine, replacing a leaking seal or carrying out preventative maintenance, this OE Match crankshaft oil seal offers dependable sealing performance and factory-style fitment.
What Does the Crankshaft Oil Seal Do?
The crankshaft oil seal prevents engine oil from escaping where the crankshaft passes through the engine case while keeping dirt, dust and moisture away from internal engine components.
Its key functions include:
- Preventing engine oil leaks
- Maintaining correct engine oil pressure
- Protecting the crankshaft opening from contamination
- Supporting long-term engine reliability
A correctly functioning seal is essential for keeping the engine clean, lubricated and operating efficiently.
Why Do Crankshaft Oil Seals Fail?
Over time, the sealing lip is subjected to continual contact with the rotating crankshaft, as well as heat and exposure to engine oil.
Common causes of failure include:
- Age-related hardening of the seal
- Heat cycling
- Wear of the sealing lip
- Oil contamination
- Incorrect installation
- Crankshaft surface wear
As the seal deteriorates, engine oil can begin to seep or leak from the crankshaft opening.
When Should It Be Replaced?
Replacement is recommended if:
- Oil is visible around the crankshaft area
- The seal shows signs of hardening or cracking
- The engine is being rebuilt
- The flywheel or pulley has been removed
- Preventative maintenance is being carried out on an older engine
Replacing the seal during engine work is inexpensive preventative maintenance that can help avoid future oil leaks and unnecessary labour costs.
Porsche 356 & 912 Engine Seals
Engine oil seals play a vital role in maintaining the reliability of classic Porsche engines. As rubber seals age, they gradually lose their flexibility and sealing ability, allowing oil leaks to develop that can affect engine cleanliness and reliability.
Replacing crankshaft oil seals during routine servicing or engine rebuilds helps maintain correct lubrication, reduce oil loss and protect valuable engine components. OE Match seals are manufactured to provide factory-style fitment and dependable long-term performance, making them an ideal choice for restoration and maintenance projects.
Benefits of Replacing the Crankshaft Oil Seal
- Prevents engine oil leaks
- Maintains proper engine sealing
- Protects against dirt and moisture ingress
- Ideal during engine rebuilds
- Long-lasting, oil-resistant materials
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911301250
The product you are viewing cross references to these numbers
OEMatch Crankshaft & Parts — Fit, Function, Confidence
OEMatch supplies crankshaft and related engine parts for Porsche models, selected for rebuilds, restorations and major servicing. The range is described to help you identify bearings, seals, fastenings and assembled crankshafts needed to complete an overhaul while preserving engine balance and lubrication integrity.
Available Types
- Complete crankshafts
- Main and rod bearings
- Thrust washers and spacers
- Oil seals and gaskets
- Dowel pins, bolts and pulleys
Understanding OEMatch Crankshaft & Parts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original crankshafts and parts.
OE (Original Equipment) refers to parts matching original specifications for the crankshafts and parts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM crankshafts and parts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OEMatch provides a wide range of crankshafts and related engine hardware for Porsche applications, supporting repairs across multiple model generations. The crankshaft converts linear piston motion into rotational energy and relies on bearings, seals and correct fastenings to maintain alignment, oil flow and rotational balance.
Benefits Include
- Restores rotational balance and smooth power delivery
- Protects bearings and journals by restoring correct clearances
- Improves oil control and sealing to reduce contamination and wear
Why Crankshaft & Parts Wear and Fail
- Oil starvation or contamination leading to bearing wear and journal scoring
- Imbalance or damaged dampers causing vibration and accelerated fatigue
- Cracks or fatigue from high loads, detonation or extended high-RPM use
- Incorrect assembly torque or alignment during rebuilds
The Importance of Replacing with OEMatch Crankshaft & Parts
Replacing worn crankshaft elements with correctly specified parts restores bearing clearances, oil control and rotational balance that are essential to long-term engine function in Porsche models. Choosing parts described for crankshaft assemblies helps reduce the risk of secondary damage, supports reliable lubrication and aids a smoother, more consistent running engine after rebuild or repair.
Advantages
- Direct-fit alternatives engineered to match original dimensions and tolerances where applicable
- Coverage aimed at classic and modern Porsche engines to support rebuilds and preventive maintenance
- Parts described for clear identification during overhaul and reassembly
