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IMS Ancillary Parts
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)

Fits:
Porsche 912 1965-69
Porsche 356 1950-65 all
Click 'Zoom in' for large parts diagram,
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG10510342
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Restore correct intermediate shaft drive operation and gear engagement during an engine rebuild with this OE Match Intermediate Shaft Gear, +.001 Oversize, reference PCG10510302/1. Designed for compatible Porsche engine applications, this precision replacement gear is intended for situations where a +.001 oversize specification is required to achieve the correct gear fit and operating relationship within the engine.
Fits: Porsche 356C / 912
The intermediate shaft is an important part of the engine's internal drive system. Depending on the engine design, it transfers rotational movement from the crankshaft to associated components and helps maintain correct mechanical timing and drive operation. The intermediate shaft gear must mesh accurately with its mating gear to provide smooth, consistent power transfer without excessive backlash, noise, or mechanical loading.
What This Product Does:
- Transfers rotational drive through the engine's intermediate shaft system.
- Helps maintain correct operation of associated engine drive components.
- Meshes with its corresponding gear to provide smooth mechanical power transfer.
- Helps maintain the specified gear engagement and backlash.
- Supports accurate and consistent intermediate shaft rotation.
- Features a +.001 oversize specification for applications requiring this particular size.
- Helps reduce excessive gear movement when correctly selected and installed.
- Replaces a worn, damaged, incorrectly sized, or unsuitable intermediate shaft gear.
- Provides an OE Match solution for compatible Porsche engine rebuilds.
Symptoms Of Wear Or Failure:
- Abnormal whining or gear noise from inside the engine.
- Rattling or mechanical noise associated with the intermediate shaft drive.
- Excessive gear backlash discovered during an engine rebuild.
- Visible wear on the gear teeth.
- Chipped, cracked, or damaged gear teeth.
- Pitting or abnormal wear across the gear contact surfaces.
- Uneven gear tooth contact patterns.
- Excessive play within the intermediate shaft drive.
- Metallic particles or gear debris in the engine oil.
- Abnormal wear of the mating gear.
- Incorrect gear clearance identified during engine assembly.
- Existing gear dimensions outside the required specification.
Why Replacement Matters:
- The intermediate shaft gear operates as part of a precision mechanical drive system. Correct tooth engagement and gear clearance are essential for smooth operation, controlled mechanical loads, and long component life.
- A worn or incorrectly sized gear can create excessive backlash, uneven tooth loading, vibration, and abnormal mechanical noise. Continued operation may accelerate wear of both the intermediate shaft gear and its mating component, potentially introducing metallic debris into the engine lubrication system.
- Insufficient clearance can be equally problematic. A gear that is too tight may generate excessive friction and heat, increase loading on the shaft and bearings, and cause accelerated gear wear or mechanical damage. This is why selecting the correct size is particularly important with an oversize component.
- The +.001 specification of this gear should therefore be treated as a precision engine-building dimension. It must be confirmed as correct for the individual engine rather than selected solely because the original gear appears worn.
- Replacing a worn or unsuitable component with the correctly specified OE Match Intermediate Shaft Gear +.001 Oversize PCG10510302/1 helps restore proper gear engagement, controlled backlash, smooth intermediate shaft operation, and dependable engine performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG10510302
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356C 1963-65
Genuine Porsche 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.
90110512509
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
This OE Match 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.
90110512509
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

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.
99610113781
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 914 (1970-1976)
-
valve control right 911 1970-73 103-20
-
valve control right 911 1978-83 103-15
-
valve control right 911 1987-89 103-15
-
valve control right 911 1984-86 103-15
-
Valve control right 911 1974-77 103-15
-
intermediate shaft - version I - 911 1965-69 103-22
-
camshaft 912 1965-69 103-30
-
valve control right 911 TURBO 1975-77 103-15
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.