IMS Ancillary Parts

Bearing shell for intermediate shaft (no/shoulder). Require 2 per engine, single item only.



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.

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99610143571

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Bearing shell for intermediate shaft (no/shoulder). Require 2 per engine,  Price is Each one 



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.

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99610143571

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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.

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99610143571

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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.

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99610113781

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Bearing shell for intermediate shaft (with shoulder).
Sold as PAIR/ Requires 1 pair per engine

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

Diagram ref no 29.

Related reference numbers
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99610113781

The product you are viewing cross references to these numbers

Bearing shell for intermediate shaft (with shoulder).
Sold as single / Requires 2 per engine

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

Diagram ref no 29.

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99610113781

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Gasket for intermediate shaft (IMS) cover plate. 

Please check the part number of your IMS cover plate to ensure compatibility. This gasket is designed for plates with part numbers 91110516200 and 91110516201.

Fits:
Porsche 911 1965-1982
Porsche 911 Turbo (930) 1975-82
Porsche 914-6 1970-72

Porsche 911 SC 1983* 
Porsche 911 Turbo (930) 1983*

Diagram ref. 49.

*NOTE: Midway through the 1983 model year, Porsche changed the IMS cover plate from a three-nut design to a two-nut circular cover. If your vehicle has the circular cover, an O-ring is used instead of this gasket. Please see below for more information:

This gasket (three-nut design) is compatible with 1983 SC models with an engine number up to and including: 63D 4069 (Standard models), 64D 3716 (US/Canadian market), and 63D 8154 (Japanese market). For 911 Turbo models, this gasket fits engines with numbers up to and including 67D 0711 (all markets).

Given the age of these vehicles, engine swaps or modifications are common. We strongly recommend verifying which cover is fitted to your engine before ordering. If your cover plate is larger with three holes, this gasket will fit. If your cover plate is smaller, circular, with two holes, this gasket will not fit.

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93010519801

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Intermediate shaft gear, Size -1.



Fits:
Porsche 356 1950-65
Porsche 912 1965-69

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PCG10510312

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Intermediate shaft gear, Size -1.

Fits:
Porsche 356 1950-65
Porsche 912 1965-69

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PCG10510312

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Porsche 912 356 Intermediate shaft gear, Size -2.

Fits:
Porsche 356 1950-65
Porsche 912 1965-69

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PCG10510322

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Intermediate shaft gear, Size: (+1)



Fits:
Porsche 912 1965-69
Porsche 356 1950-65 all 

Click 'Zoom in' for large parts diagram,

Diagram ref no 2 

Intermediate shaft gear, Size: (+1)



Fits:
Porsche 912 1965-69
Porsche 356 1950-65 all 

Click 'Zoom in' for large parts diagram,

Diagram ref no 2 

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PCG10510332

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Intermediate shaft gear, Size: (+2)



Fits:
Porsche 912 1965-69
Porsche 356 1950-65 all 

Click 'Zoom in' for large parts diagram,

Diagram ref no 2 

Intermediate shaft gear, Size: (+2)



Fits:
Porsche 912 1965-69
Porsche 356 1950-65 all 

Click 'Zoom in' for large parts diagram,

Diagram ref no 2 

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PCG10510342

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Intermediate Shaft Gear, That Is +.001 Over.
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.

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PCG10510302

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