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Porsche > 996 (911) (1997-2005) > Engine Rebuild Parts >

Engine Bearings / Shells

Engine Bearings / Shells

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DISPLAYING 17 to 32 (of 55 products)
1 2 3 4
Big End Conrod Bearings. Porsche 993 / 996 Turbo - 99310314715, 71-3775/6 STD
2
Big End Conrod Bearings. Porsche 993 / 996 Turbo
99310314715/1
Product Information
Product Information
Big End Conrod Bearings. Standard size.
SET OF 12.

glyco

Fits:
Porsche 993 1994-98
Porsche 996 Turbo

Click picture for large parts diagram.
Diagram Ref No 15.

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99310314715
99310314715
71-3775

The product you are viewing cross references to these numbers
Big end conrod bearings. Porsche 993 / 996 Turbo - 99310314715, 9931031471, 71-3775/6 STD, 71-3775/6
4
Big end conrod bearings. Porsche 993 / 996 Turbo
99310314715/2
Product Information
Product Information
Big end conrod bearings.  Standard size.
SET OF 12.

Fits:
Porsche 993 1994-98
Porsche 996 Turbo

Diagram Ref No 15.

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99310314715
99310314715
9931031471
71-3775
71-3775

The product you are viewing cross references to these numbers
Big End Conrod Bearings. Porsche 993 / 996 Turbo Oversize 0.25mm - 99310314753, 71-3775/6
2
Big End Conrod Bearings. Porsche 993 / 996 Turbo Oversize 0.25mm
99310314753/1
Product Information
Product Information
Big End Conrod Bearings. Oversize 0.25mm.
SET OF 12.

Fits:
Porsche 993 1994-98
Porsche 996 Turbo

Click picture for large parts diagram.
Diagram Ref No 15.

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99310314753
99310314753
71-3775

The product you are viewing cross references to these numbers
Connection Rod Bearing. Porsche 996 GT3 - 99610311190
2
Connection Rod Bearing. Porsche 996 GT3
Special Order item
99610311190
Product Information
Product Information
Connection Rod Bearing.
6 per engine. Price is for each.

genuine

Fits:
Porsche 996 GT3

Click picture for large parts diagram.
Diagram Ref No 10.



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99610311190
99610311190

The product you are viewing cross references to these numbers
Connection Rod Bearing. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 996 / 997
3
Connection Rod Bearing. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 996 / 997
Special Order item
99610311151
Product Information
Product Information
Connection Rod Bearing.
6 per engine. Price is for each.

porsche


Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster MKI 2005-08
Porsche 987C Cayman MKI 2005-08
Porsche 996 Carrera 1998-05
Porsche 997 Carrera 2005-08

Click picture for large parts diagram.
Diagram Ref No 10.

Crankshaft Bearing Oversize. Porsche 996/ Boxster 987/ Cayman 987C / 997 M97.21 M97.22 - 99610120904 - EB2002-00
3
Crankshaft Bearing Oversize. Porsche 996/ Boxster 987/ Cayman 987C / 997 M97.21 M97.22
99610120904WX
Product Information
Product Information
Crankshaft Bearing Shell for Engine Rebuilders.
Normally you cannot use a regular bearing with standard sizes once the crankshaft has been reworked, for this reason we have custom-made bearings with undersize dimensions to compensate for the material taken away.

westwood

Outer diameter standard, inner diameter - 0,25 mm
Price is for 2 Bearings. 14 Bearing Shells per engine.

Fits:
M96.03
Porsche 996 3.6L

M97.21 / M97.22
Porsche 987 Cayman 3.4L
Porsche 987 Boxster 3.4L
Porsche 997 3.6L / 3.8L
Porsche 996 3.6L

Click picture for large parts diagram.
Diagram Ref No 13.

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99610120904WX
99610120904

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Crankshaft Bearing Oversize. Porsche 996/ Boxster 987/ Cayman 987C / 997 M97.21 M97.22 - 99610120904, 99610120901 - EBS2001-00
3
Crankshaft Bearing Oversize. Porsche 996/ Boxster 987/ Cayman 987C / 997 M97.21 M97.22
99610120904WXX
Product Information
Product Information
Crankshaft Bearing Shell for Engine Rebuilders.
Normally you cannot use a regular bearing with standard sizes once the crankshaft has been reworked, for this reason we have custom-made bearings with undersize dimensions to compensate for the material taken away.

westwood

Outer diameter + 1,00 mm, inner diameter - 0,50 mm
Price is for 2 Bearings, 14 Bearing Shells per engine.

Fits:
M96.03
Porsche 996 3.6L

M97.21 / M97.22
Porsche 987 Cayman 3.4L
Porsche 987 Boxster 3.4L
Porsche 997 3.6L / 3.8L
Porsche 996 3.6L

Click picture for large parts diagram.
Diagram Ref No 13.

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99610120904WXX
99610120904
99610120901

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Crankshaft Bearing STANDARD. Porsche Boxster 987/ Cayman 987C / 997 M97.21 M97.22 - 99610120904
2
Crankshaft Bearing STANDARD. Porsche Boxster 987/ Cayman 987C / 997 M97.21 M97.22
Special Order item
99610120904
Product Information
Product Information
Crankshaft Bearing STANDARD size.

porsche

Porsche Boxster 987/ Cayman 987C / 997 M97.21 M97.22.
14 Bearing Shells per engine. Price is each.

Fits:
M96.03
Porsche 996 3.6L

M97.21 / M97.22
Porsche 987 Cayman
Porsche 987 Boxster
Porsche 997 3.6L / 3.8L

Click picture for large parts diagram.
Diagram Ref No 13.

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99610120904
99610120904

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Crankshaft bearing STANDARD. Porsche Boxster 987/ Cayman 987C / 997 M97.21 M97.22 / 996 3.6L M96.03 - 99610120904, 99610120901, 911088-03, 37190600
2
Crankshaft bearing STANDARD. Porsche Boxster 987/ Cayman 987C / 997 M97.21 M97.22 / 996 3.6L M96.03
99610120904/2
Product Information
Product Information
Crankshaft bearing STANDARD size.
A complete set of crankshaft main bearings - these are the half-shells (upper and lower) that support the crankshaft main journals inside the engine block. The set replaces all main-bearing shells to renew the engine bottom end’s bearing surfaces.
SET OF 14 Bearing Shells

Fits:
Engine code: M96.03
Porsche 996 3.6L

Engine code: M97.21 / M97.22
Porsche 987 Cayman
Porsche 987 Boxster
Porsche 997 3.6L / 3.8L

Diagram Ref No 13.

Sold as a full set of 14 bearing shells - enough to rebuild the entire main bearing bank of a six-cylinder boxer engine.

When installed, this bearing set:
• Provides a precise, low-friction journal surface for the crankshaft to rotate on
• Maintains correct bearing clearance and oil film under high loads and RPMs, ensuring smooth rotation and reducing wear.
• Helps preserve oil pressure and lubrication flow, preventing oil starvation and bearing damage.
• Restores engine reliability and reduces risk of bearing knock, wear or failure, especially on re-built or high-mileage engines.

Over time and use, main bearings wear down - surfaces can score, bearings can become pitted, clearance can increase, oil film may degrade, leading to:
• Engine knocks or bearing rumble
• Loss of oil pressure
• Excess crankshaft play or vibration
• Accelerated wear of crank pins, journals and engine internals

Replacing main bearings with a fresh set restores factory-correct clearances and bearing surfaces, ensuring smooth crankshaft rotation, proper oil flow, and long engine life - especially important after high mileage, rebuilding, or performance modification.

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99610120904
99610120904
99610120901
911088-03
37190600

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Main Bearing Set 0.25 oversize inner & outer Porsche 911 / 964 / 993 / 996 Turbo - 96410190171
2
Main Bearing Set 0.25 oversize inner & outer Porsche 911 / 964 / 993 / 996 Turbo
Special Order item
96410190171
Product Information
Product Information
Main Bearing Set - Oversize 0.25mm Inner & Outer

porsche

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Click picture for large parts diagram.
Diagram Ref No 21.

Related reference numbers
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96410190171
96410190171

The product you are viewing cross references to these numbers
Main bearing set 0.25 oversize inner & outer. Porsche 911 / 964 / 993 / 996 Turbo - 96410190171
2
Main bearing set 0.25 oversize inner & outer. Porsche 911 / 964 / 993 / 996 Turbo
96410190171/1
Product Information
Product Information
Main bearing set - Oversize 0.25mm Inner & Outer

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Diagram Ref No 21.

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96410190171
96410190171

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Main Bearing Set 0.25 oversize inner Porsche 911 / 964 / 993 / 996 Turbo - 96410190151
3
Main Bearing Set 0.25 oversize inner Porsche 911 / 964 / 993 / 996 Turbo
Special Order item
96410190151
Product Information
Product Information
Main Bearing Set - 0.25 OVERSIZE Inner

porsche

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Click 'Zoom in' for large parts diagram.
Diagram Ref No 21.

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96410190151
96410190151

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Main Bearing Set 0.25 oversize inner Porsche 911 / 964 / 993 / 996 Turbo - 96410190151
2
Main Bearing Set 0.25 oversize inner Porsche 911 / 964 / 993 / 996 Turbo
96410190151/1
Product Information
Product Information

Main Bearing Set – 0.25mm Oversize Inner, Standard Outer

Rebuild your Porsche engine with confidence using this OE Match Main Bearing Set featuring 0.25mm oversize inner diameter and standard outer diameter, manufactured to match original factory specifications. Tthis bearing set is intended for engines with a crankshaft that has been reground by 0.25mm on the main bearing journals, while retaining a standard crankcase housing bore.

Fits:

  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50
  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1989 3.3L Turbo (930)
  • Porsche 964 (911) C2 1989-93
  • Porsche 964 (911) C4 1989-93
  • Porsche 964 (911) RS 3.6L 1991-93
  • Porsche 964 (911) RS 3.8L 1991-93
  • Porsche 964 (911) TURBO 3.3L 1991-93
  • Porsche 964 (911) TURBO 3.6L 1991-93
  • 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 GT3 MKI 1999-02
  • Porsche 996 GT3 MKII 2003>>

Diagram Ref No 21

Precision-manufactured from high-quality bearing materials, these main bearings provide the oil film stability and support required to ensure smooth crankshaft rotation, reduced friction and long engine life. They are the ideal choice for professional engine builders, Porsche specialists and enthusiasts carrying out a complete engine overhaul.

What Do Main Bearings Do?

Main bearings are one of the most critical components inside every Porsche flat-six engine.

Their primary functions include:
Supporting the crankshaft within the crankcase.
Maintaining precise crankshaft alignment during engine operation.
Providing a low-friction bearing surface for smooth rotation.
Maintaining a stable oil film between the crankshaft and bearing shell.
Absorbing combustion and rotational loads throughout the engine.
Helping ensure correct oil pressure and long engine service life.

Correct bearing clearances are essential for maintaining engine reliability and performance.

Why Do Main Bearings Wear?

Over time, engine bearings are subjected to enormous mechanical loads and rely entirely on a consistent supply of clean engine oil.

Common causes of bearing wear include:

  • High engine mileage.
  • Oil contamination from debris or worn components.
  • Insufficient lubrication or low oil pressure.
  • Engine overheating.
  • Incorrect bearing clearances during previous rebuilds.
  • High-performance or competition use.
  • Fatigue after repeated heat cycles.

As bearings wear, oil clearance increases, reducing oil pressure and allowing excessive crankshaft movement that can eventually damage the crankshaft and crankcase.

When Should Main Bearings Be Replaced?

Main bearings should always be inspected during engine disassembly and replaced when:

  • Carrying out a complete engine rebuild.
  • The crankshaft has been reground by 0.25mm on the main journals.
  • Bearing surfaces show scoring, wear or fatigue.
  • Oil pressure has fallen below specification.
  • Bearing material shows signs of overheating or contamination.
  • Engine knock or excessive crankshaft clearance has been identified.
  • Restoring a high-mileage or performance engine.

Replacing main bearings during an engine rebuild helps ensure correct oil clearances and provides a solid foundation for reliable long-term engine performance.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410190151
96410190151

The product you are viewing cross references to these numbers
Main Bearing Set 0.25 oversize outer Porsche 911 / 964 / 993 / 996 Turbo - 96410190161
2
Main Bearing Set 0.25 oversize outer Porsche 911 / 964 / 993 / 996 Turbo
Special Order item
96410190161
Product Information
Product Information
Main Bearing Set - Oversize 0.25mm Outer

porsche

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Click picture for large parts diagram.
Diagram Ref No 21.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410190161
96410190161

The product you are viewing cross references to these numbers
Main bearing set 0.25 oversize outer. Porsche 911 / 964 / 993 / 996 Turbo - 96410190161
3
Main bearing set 0.25 oversize outer. Porsche 911 / 964 / 993 / 996 Turbo
96410190161/1
Product Information
Product Information
Main bearing set - Oversize 0.25mm Outer

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Diagram Ref No 22 + 23.

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96410190161
96410190161

The product you are viewing cross references to these numbers
Main Bearing Set 0.50 oversize inner Porsche 911 / 964 / 993 / 996 Turbo - 96410190156
2
Main Bearing Set 0.50 oversize inner Porsche 911 / 964 / 993 / 996 Turbo
Special Order item
96410190156
Product Information
Product Information
Main Bearing Set - 0.50 OVERSIZE Inner

porsche

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-97
Porsche 996 Turbo 2000-05

Click picture for large parts diagram.
Diagram Ref No 21.

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96410190156
96410190156

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DISPLAYING 17 to 32 (of 55 products)
1 2 3 4
Also found on these pages
About Engine Bearings / Shells

Engine Shell Bearings – Precision Big End, Con Rod & Thrust Bearings for Porsche Engines

Engine shell bearings are the unsung heroes of an engine's architecture — ensuring smooth, friction-free motion between the crankshaft, connecting rods, and engine block. They play a vital role in maintaining oil clearance, supporting rotation, and absorbing load during combustion.

At Design911, we supply a full range of precision-engineered shell bearings, including big end bearings, connecting rod (con rod) bearings, and thrust bearings, designed for both classic air-cooled and modern water-cooled Porsche engines. Manufactured to high-grade tolerances, our bearings provide exceptional load capacity, surface finish, and oil film stability — guaranteeing reliability even under extreme performance conditions.

Whether you’re carrying out a rebuild, refresh, or performance upgrade, our manufacturer-quality bearings deliver the balance, durability, and precision demanded by Porsche enthusiasts and engine builders worldwide.

What Do Engine Shell Bearings Do?

Shell bearings create a low-friction interface between rotating and stationary engine parts, allowing the crankshaft and connecting rods to spin freely under heavy load.

Core Functions:

  • Support crankshaft and con rod rotation with minimal friction.
  • Maintain correct oil clearance for consistent lubrication.
  • Absorb and distribute combustion forces evenly across the crank journals.
  • Reduce wear and vibration, enhancing engine longevity.

Without these bearings, metal-to-metal contact would occur, resulting in catastrophic engine failure.

Why Do Engine Bearings Fail?

Even high-performance bearings wear over time, particularly when exposed to heat, contamination, or oil pressure issues. Failure can lead to increased friction, engine noise, or complete bearing seizure.

Common Causes of Bearing Failure Include:

  • Oil starvation or low oil pressure, causing direct metal contact.
  • Contaminated or degraded engine oil, introducing abrasive particles.
  • Improper clearance or installation, leading to uneven wear.
  • Overheating from excessive load or detonation.
  • Bearing fatigue or material degradation after prolonged use.

Signs of bearing wear include knocking sounds, low oil pressure warnings, or visible scoring on bearing surfaces. Immediate replacement is critical to prevent damage to the crankshaft and engine block.

Why Replace with Precision-Grade Bearings?

Installing new, precision-matched bearings during an engine rebuild ensures proper oil clearance, smooth operation, and reliable power delivery.

Key Benefits:

  • Restores optimal oil pressure and lubrication performance.
  • Eliminates knocking and vibration caused by worn bearings.
  • Prevents crankshaft scoring and internal wear.
  • Crafted from tri-metal or bi-metal alloys for superior strength and durability.
  • Precision-machined tolerances ensure consistent performance and fitment.
  • Compatible with a wide range of Porsche engines, from air-cooled 911s to GT models.

Replacing worn shell bearings is a vital step in any Porsche engine rebuild, ensuring the longevity and smoothness that define the marque’s performance heritage.

Highlights:

  • Comprehensive range of big end, con rod, and thrust bearings.
  • Precision-engineered to motorsport standards for high-load durability.
  • Tri-metal and bi-metal alloy constructions for strength and thermal stability.
  • Ensures consistent oil clearance and pressure balance.
  • Ideal for rebuilds, restorations, and high-performance applications.
  • Perfect fitment for Porsche air-cooled and water-cooled engines.

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