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IMS Ancillary Parts

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99610143571/2KIT
Product Information
Product Information
2 x Bearing shell for intermediate shaft (no/shoulder) 
2 x Bearing shell for intermediate shaft (with shoulder).
Set of 4pcs 

Set of 4 includes four bearing shells for the intermediate shaft. This bearing set is used to control axial play and radial support of the intermediate shaft. These precisely machined shells maintain the correct end-float, allowing accurate cam timing and smooth chain drive function under high RPM loads.


Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 996 turbo / GT2 / GT3
Porsche 997.1 turbo / GT2 / GT3
Porsche 997.2 GT2 / GT3

Diagram ref no 29 & 30.



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99610143571
99610143570
90110113500
99310113500
99610143571
99610113780
99310113701
91610113700
99310113700

The product you are viewing cross references to these numbers
Special Order item
99610143571
Product Information
Product Information
Bearing shell for intermediate shaft (no/shoulder). Require 2 per engine, single item only.

porsche

Fits:
Porsche 993 1994-98
Porsche 996 Turbo/GT2/GT3
Porsche 997.1 Turbo/GT2/GT3
Porsche 997.2 GT2/GT3

This product supersedes Porsche's old part numbers:
- 90110113500
- 99310113500

Click 'Zoom in' for large parts diagram.
Diagram ref no 30.

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Related, superseded, cross reference or alternative numbers for comparison.

99610143571
99610143570
90110113500
99310113500
99610143571

The product you are viewing cross references to these numbers
99610143571/1
Product Information
Product Information
Bearing shell for intermediate shaft (no/shoulder). Require 2 per engine,  Price is Each one 

glyco

Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 996 Turbo/GT2/GT3
Porsche 997.1 Turbo/GT2/GT3
Porsche 997.2 GT2/GT3

This product supersedes Porsche's old part numbers:
- 90110113500
- 99310113500

Click 'Zoom in' for large parts diagram.
Diagram ref no 30.

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Related, superseded, cross reference or alternative numbers for comparison.

99610143571
99610143570
90110113500
99310113500
99610143571

The product you are viewing cross references to these numbers
99610143571/2
Product Information
Product Information
Bearing shell for intermediate shaft (no/shoulder) - Sold as a pair 

Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 996 turbo / GT2 / GT3
Porsche 997.1 turbo / GT2 / GT3
Porsche 997.2 GT2 / GT3

This product supersedes Porsche's old part numbers:
- 90110113500
- 99310113500

Diagram ref no 30.

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

99610143571
99610143570
90110113500
99310113500
99610143571

The product you are viewing cross references to these numbers
99610113780/2
Product Information
Product Information
Bearing shell for intermediate shaft (with shoulder).
Sold as PAIR / Requires 1 pair per engine

Pair, includes two bearing shells for the intermediate shaft, with one shell having a thrust shoulder. This bearing set is used to control axial play and radial support of the intermediate shaft. These precisely machined shells maintain the correct end-float, allowing accurate cam timing and smooth chain drive function under high RPM loads.

Fits:
Porsche 911 - 1965 to 1989
Porsche 914/6 - 1970 to 1976
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 996 turbo / GT2 / GT3
Porsche 997.1 turbo / GT2 / GT3
Porsche 997.2 GT2 / GT3

This product supersedes Porsche's old part numbers:
- 91610113700
- 99310113700
- 99310113701

Diagram ref no 29.

These high-quality bearings resist wear, maintain stability under loading, and reduce friction. The shoulder shell is designed to handle axial load and keep the shaft from shifting. Both shells are matched to OE tolerances for crush and thickness to preserve ideal oil film clearance and ensure long life.

•  Location: Inside the engine case, at the intermediate shaft bore, flanking the connecting housing
•  Function: Provides radial support and axial control (shoulder shell) for the intermediate shaft

Over time, the intermediate shaft bearing shells may wear, lose geometry, or develop surface fatigue. Symptoms of failure include increased endplay (shaft axial movement), chain rattle, timing variation, and rapid wear of adjacent sprockets or tensioners.

This pair should be replaced during any engine rebuild, crankshaft pull, or when measurements show endplay outside specification. Installing fresh shells restores proper shaft location and timing stability for durable performance.



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

99610113780
99610113780
99310113701
91610113700
99310113700

The product you are viewing cross references to these numbers
99610113780/1
Product Information
Product Information
Bearing shell for intermediate shaft (with shoulder).
Sold as PAIR/ Requires 1 pair per engine

glyco

Fits:

Porsche 964
Porsche 993 1994-98
Porsche 996 Turbo/GT2/GT3
Porsche 997.1 Turbo/GT2/GT3
Porsche 997.2 GT2/GT3

This product supersedes Porsche's old part numbers:
- 91610113700
- 99310113700

Click 'Zoom in' for large parts diagram.
Diagram ref no 29.

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

99610113780
99610113780
99310113701

The product you are viewing cross references to these numbers
Special Order item
99610113780::1
Product Information
Product Information
Bearing shell for intermediate shaft (with shoulder).
Sold as single / Requires 2 per engine

porsche

Fits:
Porsche 911
Porsche 964
Porsche 993 1994-98
Porsche 996 Turbo/GT2/GT3
Porsche 997.1 Turbo/GT2/GT3
Porsche 997.2 GT2/GT3

This product supersedes Porsche's old part numbers:
- 91610113700
- 99310113700

Click 'Zoom in' for large parts diagram.
Diagram ref no 29.

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

99610113780
99610113780
02-8005 STD

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Special Order item
90110512504
Product Information
Product Information
Intermediate Shaft Sprocket / Timing Gear
The Genuine Porsche 90110512504 Intermediate Shaft Sprocket is the factory-engineered drive gear that ensures precise timing chain operation in Porsche 911 air-cooled flat-six engines. Mounted on the intermediate shaft, it transfers rotation from the crankshaft to the camshafts, synchronizing valve timing for optimal performance, smooth running, and reliability.
Sold each, 2 required per vehicle.

Fits:
Porsche 911 1970 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997.1 Turbo 2007 - 2009 (Engine type 9770)
Porsche 997.2 Turbo 2010 - 2013 (Engine type 9770)

Diagram ref no 28

Over time, timing gears can develop tooth wear, pitting, or chain-track distortion, leading to slack, noise, or incorrect valve timing.
Replace with a Genuine Porsche part during engine rebuilds or timing service to restore:
Original chain engagement and cam phasing
 Factory reliability and noise reduction
 Long-term timing accuracy

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

90110512504
90110512504

The product you are viewing cross references to these numbers
90110512504/1
Product Information
Product Information
Intermediate Shaft Sprocket / Timing Gear.
The OE Match 90110512504 Intermediate Shaft Sprocket is designed as a direct-fit replacement for the factory sprocket mounted on the intermediate shaft in many Porsche 911 models. It meshes with the timing chain to drive cam or auxiliary components, maintaining precise synchronization between crankshaft and camshaft assemblies.
Sold each, 2 required per vehicle.

Fits:
Porsche 911 1970 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997.1 Turbo 2007 - 2009 (Engine type 9770)
Porsche 997.2 Turbo 2010 - 2013 (Engine type 9770)

Diagram ref no 28

The sprocket features correctly machined tooth profiles and balanced construction to minimize wear and chain noise. Each gear is dimensionally matched to Porsche factory specifications, guaranteeing perfect alignment, secure fitment, and long service life.

Ideal for use during engine rebuilds, timing chain service, or IMS restoration, this replacement sprocket restores proper chain drive operation and timing integrity to your air-cooled flat-six engine.

•  Position: Mounted on the intermediate shaft (IMS) within the timing chain housing
  Function: Transmits rotational motion from the timing chain to cam drive or auxiliary systems, helping to maintain engine valve timing integrity.
  Symptoms of wear: Chain rattle, poor timing, metallic noise, valve timing error
  Benefits: OEM fit and durability, precision-machined teeth, corrosion resistance
  Installation: Direct-fit replacement; replace with new chain and tensioners for optimal timing performance

An intermediate shaft sprocket that’s worn, damaged, or misaligned can introduce timing error, chain slack, noise, or accelerated wear of timing components. Replace it when:
•  You are performing a timing chain or IMS overhaul
•  You find tooth damage, pitting, or wear

•  You observe abnormal chain noise, jump, or performance loss

Using a fresh sprocket restores the proper tooth engagement, accurate timing, and longevity of the cam drive system, helping avoid expensive engine damage.



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

90110512504
90110512504

The product you are viewing cross references to these numbers
Special Order item
99610113780
Product Information
Product Information
Thrust Bearing for Intermediate Shaft. Sold as EACH.

porsche

Fits:
Porsche 911 1965-89
Porsche 914
Porsche 930 Turbo 1975-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo/GT2/GT3
Porsche 997.1 Turbo/GT2/GT3
Porsche 997.2 GT2/GT3

Click 'Zoom in' for large parts diagram.
Diagram ref no 31

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

99610113780
99310113701
99310113700
91610113700
9960113780GLY
99610113780

The product you are viewing cross references to these numbers
DISPLAYING 1 to 10 (of 10 products)
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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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