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Your Vehicle  //  Porsche  //  997 (911) MK1 2005-2008  //  997 MK1 Carrera 2 3.6L 2005-08
Porsche997 (911) MK1 2005-2008997 MK1 Carrera 2 3.6L 2005-08Engine Rebuild PartsIntermediate shaft (IMS)

IMS Ancillary Parts

IMS Ancillary Parts

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DISPLAYING 1 to 4 (of 4 products)
Additional rear main no. 8 bearing seal and housing. Porsche 986 Boxster / 996 - 996986REAREPS, 99911349040, 99911349041, 99710121200, 99710121201, 0PB105249
2
Additional rear main no. 8 bearing seal and housing. Porsche 986 Boxster / 996
996986REAREPS
Product Information
Product Information
Additional rear main no. 8 bearing seal and housing.

Fits:
Porsche 986/987 Boxster 1997-2009
Porsche 996/997 1997-2009



Our team of technicians has developed a Rear Main Seal that corrects the notorious rear main oil leaks on the m96 and m97 engines. It has been developed to solve the twisting of the last journal of the crank shaft, reducing engine vibration and extending engine life. Prevent engine failure, by replacing your factory rear main seal with our upgraded rear main bearing seal and housing.

Features:
• prevents crank warping
• decreases engine vibrations
• prevents piston rod #6 failure
• extends engine life

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Related, superseded, cross reference or alternative numbers for comparison.

996986REAREPS
996986REAREPS
99911349040
99911349041
99710121200
99710121201
0PB105249

The product you are viewing cross references to these numbers
IMS Bearing Cap. Porsche 986 Boxster / 996 Carrera / 997.1 Carrera - 99610502403, 99610502401
3
IMS Bearing Cap. Porsche 986 Boxster / 996 Carrera / 997.1 Carrera
Special Order item
99610502403
Product Information
Product Information

This genuine Porsche IMS bearing cap serves the intermediate shaft bearing assembly on selected Porsche engines. It provides the cover and mating interface needed when replacing an existing cap that has damaged seating or sealing surfaces.

Fits

  • Porsche 986 Boxster 1997–04
  • Porsche 996 Carrera 2 1998–05
  • Porsche 996 Carrera 4 1999–2001
  • Porsche 996 Carrera 4S 2002–2005
  • Porsche 997.1 Carrera 2 2005–2008*
  • Porsche 997.1 Carrera 2S 2005–2008*
  • Porsche 997.1 Carrera 4 2005–2008*
  • Porsche 997.1 Carrera 4S 2005–2008*

    *Only for cars fitted with Intermediate shaft 996.105.901.02

Suitability depends on the engine specification, production identification and installed intermediate shaft assembly, not the model-family listing alone. Check fitment for your specific vehicle (model, year, engine) before ordering.

What Is This Part?

The IMS bearing cap is a housing component associated with the engine’s intermediate shaft bearing position. It covers this area and provides contact surfaces for adjoining components and their sealing arrangement. The condition of these interfaces matters when the assembly is dismantled and rebuilt. This cap is an ancillary component, rather than an IMS bearing replacement kit or a timing-chain tensioner.

What Does This Part Do?

  • Covers the bearing position: Forms the cap at the intermediate shaft bearing area.
  • Provides a mating interface: Gives adjoining components the contact surfaces needed for assembly.
  • Accommodates sealing components: Works with the associated seals at the cap interface.
  • Allows damaged housing renewal: Replaces an existing cap found unsuitable for refitting after inspection.

    Why Replace This Part?

Replacement may be appropriate if the existing cap is cracked, deformed or damaged around its mating surfaces or fixing locations. A cap that cannot seat correctly should be assessed before the assembly is put back together, particularly during engine rebuilding or intermediate shaft maintenance.

Inspect the bearing, adjoining seals, fasteners and mounting surfaces at the same time. Oil leakage alone does not identify a defective cap: establish the source before replacing components, because nearby seals can produce similar evidence. Changing the cap alone does not remedy a deteriorated IMS bearing.

.When to Replace This Part?

  • Visible damage: Cracks, deformation or other deterioration found during dismantling.
  • Marked contact surfaces: Damage affecting the cap’s seating or sealing interfaces.
  • Damaged fixing locations: Wear or damage that prevents correct assembly.
  • Poor seating: Evidence that the previous cap was fitted unevenly or no longer sits correctly.
  • Oil traces at the interface: Inspect the cap and surrounding seals to identify whether the cap itself needs renewal.

    Where Is This Part Fitted?

Location: At the intermediate shaft bearing position within the engine’s IMS assembly. The cap interfaces with adjoining housing and sealing components; match it to the installed intermediate shaft specification.

Technical Details

  • Supersession: Part 99610502403 supersedes 99610502401.
  • 997.1 shaft identification: The specified application uses intermediate shaft 996.105.901.02.

    FAQs
  • When should the cap be renewed? When inspection reveals damage, poor seating or deterioration that makes it unsuitable for refitting. Dismantling alone does not mean a sound cap must be replaced.
  • Does an oil leak prove the cap has failed? No. Inspect the cap and surrounding sealing components to establish the source.
  • Does this replace the IMS bearing? No. The cap serves the bearing assembly; bearing condition requires separate assessment.
  • How is suitability checked? Match the VIN, engine identification, production restrictions and original component reference. IMS assemblies can differ according to engine specification and production date.

Product Summary

  • Product: Intermediate shaft bearing cap.
  • Brand: Genuine Porsche.
  • Part number: 99610502403.
  • Previous reference: 99610502401.
  • Purpose: Covers the IMS bearing position and provides mating and sealing interfaces within the assembly.


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

99610502403
99610502403
99610502401

The product you are viewing cross references to these numbers
Timing Chain - Tooth-Type - For Crankshaft & Intermediate Shaft (IMS). Porsche 986/987.1 Boxster/Cayman & 996/997.1 Carrera - 99610517156, 99610517158
4
Timing Chain - Tooth-Type - For Crankshaft & Intermediate Shaft (IMS). Porsche 986/987.1 Boxster/Cayman & 996/997.1 Carrera
Special Order item
99610517158
Product Information
Product Information
Tooth-Type Timing Chain Used To Connect The Engine’s Crankshaft To The Intermediate Shaft (IMS).

Fits:
Porsche 986 Boxster 2.7L 2001>>2004
Porsche 986 Boxster S 3.2L 2001>>2004 

Porsche 987.1 Boxster 2.7L MKI 2005>>2008
Porsche 987.1 Boxster S 3.2L MKI 2005
Porsche 987.1 Boxster S 3.4L MKI 2006>>2008

Porsche 987.1 Cayman 2.7L MKI 2005>>2008 
Porsche 987.1 Cayman S 3.4L MKI 2006>>2008

Porsche 996 Carrera 3.4L 2001
Porsche 996 Carrera 4 3.4L 2001
Porsche 996 Carrera 3.6L 2002>>2004
Porsche 996 Carrera 4 3.6L 2002>>2004
Porsche 996 Carrera 4S 3.6L 2002>>2005 
Porsche 996 Targa 3.6L 2002>>2005

Porsche 997.1 Carrera 3.6L MKI 2005>>2008
Porsche 997.1 Carrera S 3.8L MKI 2005>>2008
Porsche 997.1 Carrera 4 3.6L MKI 2006>>2008
Porsche 997.1 Carrera 4S 3.8L MKI 2006>>2008
Porsche 997.1 Targa 4 3.6L MKI 2007>>2008
Porsche 997.1 Targa 4S 3.8L MKI 2007>>2008

NOTE: For The 2001 Model Year, Porsche Replaced The Intermediate Shaft's Roller-Type (Duplex) Chain With A Tooth-Type Chain. This Listing Is For The Later Tooth-Type Chain And Is Not Compatible With Earlier Engines Equipped With The Roller-Type Chain.


While Unlikely, It's Possible That An Earlier Engine May Have Been Rebuilt And Upgraded To Use The Newer Chain Design. For This Reason, Design 911 Strongly Recommends Confirming Which Type Of Chain Your Engine Uses Before Placing An Order. To Assist With Identification, Our Product Images Include A Helpful Comparison Between The Roller-Type (Duplex) Chain And The Tooth-Type Chain.

Diagram Ref No 17  



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

99610517158
99610517156
99610517158

The product you are viewing cross references to these numbers
Timing Chain - Tooth-Type - for Crankshaft & Intermediate Shaft (IMS). Porsche 986/987-1 Boxster/Cayman & 996/997-1 Carrera - 99610517156, 99610517158 - 94749
3
Timing Chain - Tooth-Type - for Crankshaft & Intermediate Shaft (IMS). Porsche 986/987-1 Boxster/Cayman & 996/997-1 Carrera
99610517158/1
Product Information
Product Information
Tooth-type timing chain used to connect the engine’s crankshaft to the intermediate shaft (IMS).

Fits:
Porsche 986 Boxster 2.7L 2001 - 2004
Porsche 986 Boxster S 3.2L 2001 - 2004 

Porsche 987-1 Boxster 2.7L 2005 - 2008
Porsche 987-1 Boxster S 3.2L 2005
Porsche 987-1 Boxster S 3.4L 2006 - 2008

Porsche 987-1 Cayman 2.7L 2005 - 2008 
Porsche 987-1 Cayman S 3.4L 2006 - 2008

Porsche 996-1 Carrera 3.4L 2001
Porsche 996-1 Carrera 4 3.4L 2001

Porsche 996-2 Carrera 3.6L 2002 - 2004
Porsche 996-2 Carrera 4 3.6L 2002 - 2004
Porsche 996-2 Carrera 4S 3.6L 2002 - 2005 
Porsche 996-2 Targa 3.6L 2002 - 2005

Porsche 997-1 Carrera 3.6L 2005 - 2008
Porsche 997-1 Carrera S 3.8L  2005 - 2008
Porsche 997-1 Carrera 4 3.6L 2006 - 2008
Porsche 997-1 Carrera 4S 3.8L 2006 - 2008
Porsche 997-1 Targa 4 3.6L 2007 - 2008
Porsche 997-1 Targa 4S 3.8L 2007 - 2008

Diagram ref. 17  

NOTE: For the 2001 model year, Porsche replaced the intermediate shaft's roller-type (duplex) chain with a tooth-type chain. This listing is for the later tooth-type chain and is not compatible with earlier engines equipped with the roller-type chain.

While unlikely, it's possible that an earlier engine may have been rebuilt and upgraded to use the newer chain design. For this reason, Design 911 strongly recommends confirming which type of chain your engine uses before placing an order. To assist with identification, our product images include a helpful comparison between the roller-type (duplex) chain and the tooth-type chain.

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

99610517158
99610517156
99610517158

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
Also found on these pages
About IMS Ancillary Parts

Engine IMS Ancillary Parts – Precision Components for Reliable Porsche Performance

The Intermediate Shaft (IMS) plays a crucial role in Porsche’s flat-six engine design, connecting the crankshaft and camshafts to ensure precise timing and smooth operation. Supporting parts such as bearings, flanges, seals, tensioners, and housings are equally vital — working together to maintain lubrication, reduce friction, and prevent catastrophic engine failure.

At Design911, we offer a comprehensive range of precision-engineered IMS ancillary parts built for strength, accuracy, and long-term reliability. Designed to withstand high RPM loads and extreme temperatures, each component ensures the durability and performance Porsche engines are renowned for.

Whether you’re carrying out preventive maintenance, a full rebuild, or an IMS bearing upgrade, our manufacturer-quality components deliver dependable operation and peace of mind on every drive.

What Do IMS Ancillary Parts Do?

IMS ancillary components work together to keep the intermediate shaft properly aligned, lubricated, and balanced.

Core Functions:

  • Bearings and flanges support the shaft and maintain alignment between camshafts and crankshaft.
  • Seals and o-rings prevent oil leaks and protect internal components from contamination.
  • Tensioners and guides maintain correct timing chain tension, reducing wear.
  • Lubrication systems ensure consistent oil flow to critical moving parts.

A properly functioning IMS system ensures smoother timing, quieter operation, and extended engine life.

Why Do IMS Components Fail?

The IMS and its associated parts are subjected to constant stress, heat, and oil contamination. Over time, this leads to wear, bearing degradation, or seal failure — all of which can result in major engine damage if ignored.

Common Causes of Failure Include:

  • Bearing wear or corrosion, leading to timing misalignment.
  • Oil contamination, accelerating component fatigue.
  • Hardened or cracked seals, causing leaks.
  • Chain tension loss from worn guides or tensioners.
  • Lack of lubrication due to clogged oil passages or restricted flow.

Symptoms may include metallic noises, oil leaks, timing issues, or engine warning lights — all signs that the IMS or its ancillary parts need immediate attention.

Why Replace with Precision-Engineered IMS Ancillary Parts?

Upgrading or replacing IMS-related components with precision-engineered, high-durability replacements restores proper engine balance, lubrication, and reliability — essential for preventing costly failures.

Key Benefits:

  • Restores accurate camshaft and crankshaft timing.
  • Prevents bearing and shaft wear, reducing engine failure risk.
  • Improves lubrication and oil flow consistency.
  • Eliminates oil leaks and timing irregularities.
  • Constructed from corrosion-resistant, heat-treated materials.
  • Direct-fit design for modern and classic Porsche engines.

Replacing worn IMS ancillary parts during rebuilds or maintenance ensures your Porsche continues to deliver smooth, dependable performance for years to come.

Highlights:

  • High-quality IMS bearings, seals, flanges, and tensioners for Porsche engines.
  • Precision-engineered for strength, accuracy, and durability.
  • Enhances lubrication and reduces friction under load.
  • Protects against timing failure and oil contamination.
  • Ideal for rebuilds, upgrades, and preventative maintenance.
  • Compatible with a wide range of Porsche flat-six engines.

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