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Crankshaft Standard (STD). Porsche 911 1972-77 / 911 turbo 3.0ltr - 91610201600
91610201600/2
Vehicle Group
- 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 1975-1977 3.0L Turbo (930)
Information
Standard Size Crankshaft (STD)
The standard size (STD) engine crankshaft is an
essential rotating component for the early air-cooled Porsche models.
Fits:
- Porsche 911 1972-1973 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
Designed to maintain original journal dimensions and deliver long-lasting structural integrity, this crankshaft provides the precision, balance and strength demanded by classic flat-six engines.
Whether performing a true-to-original restoration or a full bottom-end rebuild, this crankshaft ensures proper bearing clearances, smooth rotation and the reliability required to support both naturally aspirated and early turbocharged Porsche engines.
What the Crankshaft Does
This crankshaft plays a central role in engine operation by:
- Transforming
piston movement into rotational torque to drive the transmission
- Maintaining
exact journal sizing for correct oil film and bearing support
- Ensuring
balanced rotation across the entire RPM range
- Supporting
reliable lubrication through precision oil galleries
- Handling
high load and thermal stress typical of air-cooled performance engines
- Providing dependable bottom-end stability for both normally aspirated and turbocharged setups
Without a properly sized and balanced crankshaft, the engine cannot run smoothly or reliably.
Why Crankshafts Can Fail
Although Porsche’s air-cooled crankshafts are renowned for
durability, age, performance use and lubrication issues can lead to failure.
Common causes include:
- Oil
starvation causing bearing damage and journal scoring
- Contamination
in the oil system leading to abrasive wear
- High-mileage
fatigue resulting in stress cracks or journal out-of-round conditions
- Overheating
reducing metallurgical strength
- Incorrect
machining or imbalance from past rebuilds
- Detonation
or pre-ignition placing excessive load on journals
- Corrosion from long storage or moisture intrusion
Symptoms can include low oil pressure, vibration, bearing noise, metal debris in the oil, or excessive crankshaft end-float.
Why You Should Replace a Worn or Damaged Crankshaft
Installing a new or precision-engineered standard size crankshaft—matched to original Porsche tolerances—provides the foundation for a reliable, long-lasting engine rebuild.
Benefits include:
- Restored bearing clearance and proper lubrication
- Smooth rotational balance and reduced engine vibration
- Improved reliability for both standard and turbocharged engines
- Protection against catastrophic bottom-end failures
- Extended lifespan for connecting rods, bearings and pistons
- Consistent performance in high-heat air-cooled environments
For valuable classics like the 1972–77 Porsche 911 and early 930 Turbo, a correct STD crankshaft is essential to preserving performance and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91610201600
91610210600
916102016 X
916102016X
916102016AX
The product you are viewing cross references to these numbers
Price: €7,692.11
Orderable
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Information
Rear main seal (crankshaft oil seal) - 85 x 105 x 11
OE Match rear main seal / crankshaft oil seal, 85 x 105 x 11, for Porsche 986, 987, 981, 718, 996, 997, 991, 992, 955, 958, 970, and 95B.1 models. This replacement seal helps prevent engine oil leaks from the rear crankshaft area and supports correct engine sealing.
Fits:
Porsche 986 Boxster 2.5L 1997-99
Porsche 986 Boxster 2.7L 2000-04
Porsche 986 Boxster S 3.2L 2000-04
Porsche 987-1 Boxster 2.7L 2005-08
Porsche 987-1 Boxster S 3.4L 2005-08
Porsche 987-1 Cayman 2.7L 2005-08
Porsche 987-1 Cayman S 3.4L 2005-08
Porsche 987-2 Boxster 2.9L 2009-12
Porsche 987-2 Boxster S 3.4L 2009-12
Porsche 987-2 Boxster Spyder 3.4L 2011-12
Porsche 987-2 Cayman 2.9L 2009-12
Porsche 987-2 Cayman S 3.4L 2009-12
Porsche 987-2 Cayman R 3.4L 2012
Porsche 981 Boxster 2.7L 2012-16
Porsche 981 Boxster S 3.4L 2012-16
Porsche 981 Boxster GTS 3.4L 2015-16
Porsche 981 Boxster Spyder 3.8L 2016
Porsche 981 Cayman 2.7L 2014-16
Porsche 981 Cayman S 3.4L 2014-16
Porsche 981 Cayman GTS 3.4L 2014-16
Porsche 981 Cayman GT4 3.8L 2016
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Porsche 996-2 Targa 3.6L 2002-04
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Porsche 997-1 Carrera 4 3.6L 2006-08
Porsche 997-1 Carrera S 3.8L 2005-08
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Porsche 997-1 Targa 4S 3.8L 2007-08
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Porsche 997-2 Carrera 4 3.6L 2009-12
Porsche 997-2 Carrera S 3.8L 2009-12
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Porsche 997-2 Carrera 4 GTS 3.8L 2011-12
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Porsche 991-2 Carrera S 3.0L 2017-19
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Porsche 992-1 Carrera 4 3.0L 2019-24
Porsche 992-1 Carrera 4S 3.0L 2019-24
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Porsche 992-1 Targa 4 3.0L 2019-24
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Diagram ref. 5
The rear main seal seals the rear crankshaft exit point to prevent engine oil from leaking into the bellhousing or transmission area. A correctly fitted seal is essential for maintaining oil system integrity and keeping the clutch, flywheel, torque converter, and gearbox area free from oil contamination.
Functions
• Replaces the rear main crankshaft oil seal
• Helps prevent engine oil leaks from the rear crankshaft area
• Supports correct engine oil sealing
• Helps protect clutch, flywheel, and transmission components from oil contamination
• Suitable for engine, clutch, flywheel, or gearbox service
• Replaces hardened, worn, cracked, leaking, or damaged rear main seals
• OE Match replacement for Porsche engine sealing repair.
Why Replace This Part?
Rear main seals are exposed to heat, oil pressure, crankshaft rotation, age, and engine vibration. Over time, the seal can harden, wear, crack, or lose sealing tension. A leaking rear main seal may cause oil drips between the engine and gearbox, oil contamination around the bellhousing, clutch slip on manual vehicles, burning oil smell, or failed inspection. Replacing the seal helps restore reliable engine sealing and prevents further oil leakage.
When to Replace This Part
• Oil is leaking between the engine and gearbox
• Rear main seal leakage is confirmed
• The gearbox has been removed for service
• Clutch, flywheel, or torque converter work is being carried out
• The original seal is hardened, worn, cracked, or damaged
• Engine rebuild or major service work is being completed
• Preventative replacement is required while access is available.
Where it fits on the car
This seal fits at the rear of the crankshaft, between the engine and transmission area. It forms part of the engine oil sealing system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
0PB105249
The product you are viewing cross references to these numbers
OE Match rear main seal / crankshaft oil seal, 85 x 105 x 11, for Porsche 986, 987, 981, 718, 996, 997, 991, 992, 955, 958, 970, and 95B.1 models. This replacement seal helps prevent engine oil leaks from the rear crankshaft area and supports correct engine sealing.
Fits:
Porsche 986 Boxster 2.5L 1997-99
Porsche 986 Boxster 2.7L 2000-04
Porsche 986 Boxster S 3.2L 2000-04
Porsche 987-1 Boxster 2.7L 2005-08
Porsche 987-1 Boxster S 3.4L 2005-08
Porsche 987-1 Cayman 2.7L 2005-08
Porsche 987-1 Cayman S 3.4L 2005-08
Porsche 987-2 Boxster 2.9L 2009-12
Porsche 987-2 Boxster S 3.4L 2009-12
Porsche 987-2 Boxster Spyder 3.4L 2011-12
Porsche 987-2 Cayman 2.9L 2009-12
Porsche 987-2 Cayman S 3.4L 2009-12
Porsche 987-2 Cayman R 3.4L 2012
Porsche 981 Boxster 2.7L 2012-16
Porsche 981 Boxster S 3.4L 2012-16
Porsche 981 Boxster GTS 3.4L 2015-16
Porsche 981 Boxster Spyder 3.8L 2016
Porsche 981 Cayman 2.7L 2014-16
Porsche 981 Cayman S 3.4L 2014-16
Porsche 981 Cayman GTS 3.4L 2014-16
Porsche 981 Cayman GT4 3.8L 2016
Porsche 718 (982) Boxster 2.0L 2017>>
Porsche 718 (982) Boxster T 2.0L 2020>>
Porsche 718 (982) Boxster S 2.5L 2017>>
Porsche 718 (982) Boxster GTS 2.5L 2018-19
Porsche 718 (982) Boxster GTS 4.0L 2019>>
Porsche 718 (982) Boxster Spyder 4.0L 2019>> - Excludes RS
Porsche 718 (982) Cayman 2.0L 2017>>
Porsche 718 (982) Cayman T 2.0L 2020>>
Porsche 718 (982) Cayman S 2.5L 2017>>
Porsche 718 (982) Cayman GTS 2.5L 2018-19
Porsche 718 (982) Cayman GTS 4.0L 2019>>
Porsche 718 (982) Cayman GT4 4.0L 2019>> - Excludes RS
Porsche 996-1 Carrera 3.4L 1998-01
Porsche 996-1 Carrera 4 3.4L 1999-01
Porsche 996-2 Carrera 3.6L 2002-04
Porsche 996-2 Carrera 4 3.6L 2002-04
Porsche 996-2 Carrera 4S 3.6L 2002-05
Porsche 996-2 Targa 3.6L 2002-04
Porsche 997-1 Carrera 3.6L 2005-08
Porsche 997-1 Carrera 4 3.6L 2006-08
Porsche 997-1 Carrera S 3.8L 2005-08
Porsche 997-1 Carrera 4S 3.8L 2006-08
Porsche 997-1 Targa 4 3.6L 2007-08
Porsche 997-1 Targa 4S 3.8L 2007-08
Porsche 997-2 Carrera 3.6L 2009-12
Porsche 997-2 Carrera 4 3.6L 2009-12
Porsche 997-2 Carrera S 3.8L 2009-12
Porsche 997-2 Carrera GTS 3.8L 2011-12
Porsche 997-2 Carrera 4 GTS 3.8L 2011-12
Porsche 997-2 Carrera 4S 3.8L 2009-12
Porsche 997-2 Targa 4 3.6L 2009-12
Porsche 997-2 Targa 4S 3.8L 2009-12
Porsche 997-2 Turbo / S 3.8L 2010-13
Porsche 991-1 Carrera 3.4L 2012-16
Porsche 991-1 Carrera 4 3.4L 2012-16
Porsche 991-1 Carrera S 3.8L 2012-16
Porsche 991-1 Carrera 4S 3.8L 2012-16
Porsche 991-1 Carrera GTS 3.8L 2015-16
Porsche 991-1 Carrera 4 GTS 3.8L 2016
Porsche 991-1 Targa 4 3.4L 2015-16
Porsche 991-1 Targa 4S 3.8L 2015-16
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Porsche 970-2 Panamera S 3.0L V6 2014-16
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Diagram ref. 5
The rear main seal seals the rear crankshaft exit point to prevent engine oil from leaking into the bellhousing or transmission area. A correctly fitted seal is essential for maintaining oil system integrity and keeping the clutch, flywheel, torque converter, and gearbox area free from oil contamination.
Functions
• Replaces the rear main crankshaft oil seal
• Helps prevent engine oil leaks from the rear crankshaft area
• Supports correct engine oil sealing
• Helps protect clutch, flywheel, and transmission components from oil contamination
• Suitable for engine, clutch, flywheel, or gearbox service
• Replaces hardened, worn, cracked, leaking, or damaged rear main seals
• OE Match replacement for Porsche engine sealing repair.
Why Replace This Part?
Rear main seals are exposed to heat, oil pressure, crankshaft rotation, age, and engine vibration. Over time, the seal can harden, wear, crack, or lose sealing tension. A leaking rear main seal may cause oil drips between the engine and gearbox, oil contamination around the bellhousing, clutch slip on manual vehicles, burning oil smell, or failed inspection. Replacing the seal helps restore reliable engine sealing and prevents further oil leakage.
When to Replace This Part
• Oil is leaking between the engine and gearbox
• Rear main seal leakage is confirmed
• The gearbox has been removed for service
• Clutch, flywheel, or torque converter work is being carried out
• The original seal is hardened, worn, cracked, or damaged
• Engine rebuild or major service work is being completed
• Preventative replacement is required while access is available.
Where it fits on the car
This seal fits at the rear of the crankshaft, between the engine and transmission area. It forms part of the engine oil sealing system.
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Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Information
Crankshaft Pulley, Part Number: 996 102 115 63, also referenced as 996-102-115-63. Fits Porsche models equipped with M96 and M97 engines, including Boxster, Cayman, and 911 variants from approximately 1997 to 2008. It transmits rotational force to drive accessories via the belts (e.g., alternator, power steering, A/C) and helps absorb crankshaft vibrations, protecting engine components and maintaining smooth operation.
Fit:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08
Porsche 996 C2/C4/C4S 1998-04
Porsche 997 3.6L 2005-08
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Fit:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08
Porsche 996 C2/C4/C4S 1998-04
Porsche 997 3.6L 2005-08
Crankshaft pulleys like this one are designed to last the engine's lifetime, but here are the common failure modes to watch for:
- Rubber deterioration or separation causing excessive vibrations
- When the vibration damper fails, crankshaft vibrations aren’t absorbed, leading to noticeable engine shake—especially at certain RPMs—which can damage internal components and accessories.
- Noisy operation or belt misalignment. A failing pulley may cause the belt to slap or misalign, resulting in rubbing noises or excessive wear.
- Battery warning light or charging glitch. If the pulley fails and stops turning the alternator belt, the battery light may illuminate due to loss of charging.
Diagram Ref No 6
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Vehicle Group
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
Information
Crankshaft Standard (STD)
The
standard size crankshafts are key rotating components used in Porsche 993
engines and 996 Turbo models.
Fits:
Diagram ref no 1
The crankshaft delivers the precise journal dimensions, balance and strength needed for the high-performance flat-six architecture. Designed to maintain original tolerances, a standard-size crankshaft ensures correct bearing clearances, smooth rotation and reliable power delivery—crucial for both road and track-driven Porsches.
For any engine rebuild, restoration or major service involving these models, choosing a correctly machined and precision-balanced standard size crankshaft is essential to restoring authentic performance and long-term reliability.
What These Standard Size Porsche Crankshafts Do
Designed to work at the core of the bottom end
assembly, these crankshafts:
- Convert piston movement into rotational torque to power the drivetrain
- Maintain exact journal diameters for correct bearing oil film clearance
- Provide engine balance across all RPM ranges—crucial for high-revving Porsche flat-six engines
- Facilitate internal lubrication via precision oil galleries
- Support smooth, strong and consistent power delivery Ensure structural integrity under boost conditions in 996 turbo engines
These crankshafts are engineered to perform reliably under demanding thermal, mechanical and load environments typical of Porsche performance models.
Why Porsche 993 & 996 turbo Crankshafts Can Fail
Even though Porsche flat-six crankshafts are
exceptionally robust, years of use, high RPM and turbocharged forces can lead
to failure. Common causes include:
- Oil starvation or low pressure causing severe journal scoring
- Bearing shell failure damaging journals and lubrication paths
- Metal fatigue from aggressive driving, detonation or over-boost scenarios
- Overheating weakening the crankshaft material
- Contamination in oil scoring journals and reducing bearing life
- Imbalance from previous poor machining or unbalanced accessories
- High mileage fatigue affecting torsional stability
Symptoms of failure include persistent vibration, knocking noises, falling oil pressure, bearing debris in oil or visible wear during teardown.
Why You
Should Replace a Worn Crankshaft
Replacing a damaged crankshaft with a precision-built
standard size alternative engineered to match original performance
characteristics is crucial to achieving a reliable and long-lasting Porsche
engine rebuild.
Key benefits of replacement include:
- Restored correct bearing clearances for stable oil pressure
- Smoother rotation and reduced engine vibration
- Improved reliability for high-load, high-RPM and turbocharged conditions
- Prevention of catastrophic bottom-end failures
- Extended service life for bearings, rods and pistons
- Enhanced performance consistency and engine smoothness
With Porsche 993 and 996 Turbo engines now highly valued by enthusiasts, a precision crankshaft is foundational to any proper rebuild or restoration.
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