IMS Ancillary Parts

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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
- 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 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 GT2 2001-05
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
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
The product you are viewing cross references to these numbers
- 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 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 GT2 2001-05
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Turbo 2010-13
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.