bow Genuine Porsche part 90110556900

Camshaft timing chain. SPLIT TYPE.
Chain Type: Duplex,
Timing Chain Size: D67ZN
No. of chain links: 98

Fits:
Porsche 911 1965 - 1989
Porsche 964 1991 - 1993

TIP! If you detect a chain clap or rattling noise in the engine, your timing chain may be worn or stretched and needs replacing. Each car has two.

This OE Match camshaft timing chain is a replacement split-type timing chain for air-cooled Porsche 911 engines. It is designed to match the original-style fit and function, helping maintain correct camshaft timing and reliable valve train operation.

The camshaft timing chain links the crankshaft drive to the camshaft drive system, ensuring that the camshafts rotate in precise timing with the engine crankshaft. This correct timing allows the engine valves to open and close at the right moment for smooth running, correct combustion, and dependable engine performance.

Functions
•  Drives the camshaft timing system
•  Helps keep crankshaft and camshaft timing synchronised
•  Supports correct valve opening and closing timing
•  Helps maintain smooth engine running and performance
•  Provides a split-type design for easier installation during service
•  Replaces stretched, worn, noisy, or damaged timing chains
•  OE Match replacement for engine rebuilds and timing chain repairs

Why Replace This Part?
Camshaft timing chains are subject to constant load, heat, oil exposure, and high-speed operation. Over time, the chain can stretch, wear, become noisy, or affect accurate cam timing. A worn timing chain may cause rattling noises, poor running, incorrect valve timing, or reduced engine performance. Replacing the chain during engine service or rebuild helps restore timing accuracy and long-term reliability.

When to Replace This Part
•  The timing chain is stretched, worn, noisy, or damaged
•   There is rattling from the cam chain housing area
•   Camshaft timing is being reset or corrected
•   The engine is being rebuilt or overhauled
•   Chain ramps, sprockets, or tensioners are being replaced
•   The timing chain covers or camshaft housings have been removed
•   As preventative replacement during major engine service.

Where it fits on the car
This timing chain fits inside the engine timing chain housing, forming part of the camshaft drive system. It runs between the crankshaft-driven intermediate shaft sprocket and the camshaft sprocket assembly, depending on the engine layout.

Related reference numbers
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91110552951

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Timing Chain Split Link.
The OE Match Timing Chain Split Link is a precision-engineered replacement connecting link designed for Porsche timing chain systems. This small but essential component joins the ends of the timing chain, allowing secure installation and reliable operation of the engine's valve timing mechanism.

Fits:

• 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  

Manufactured to OE specifications for strength, fit and durability, the split link is designed to withstand the constant loads, temperatures and operating conditions found within the timing chain assembly. It provides a secure connection that helps maintain accurate timing chain operation and overall engine reliability.

What This Product Does:

• Connects and secures the ends of the engine timing chain.
• Allows installation or repair of the timing chain assembly.
• Maintains continuous timing chain operation.
• Supports accurate camshaft and crankshaft synchronisation.
• Helps ensure precise valve timing throughout the engine's operating range.
• Contributes to smooth engine performance and reliability.

Symptoms Of Wear Or Failure:

• Timing chain noise or rattling.
• Excessive timing chain slack.
• Visible wear or damage to the link components.
• Accelerated timing chain wear.
• Inconsistent engine timing.
• Reduced engine performance.
• Difficulty maintaining proper chain tension.
• Potential timing chain failure in severe cases.

Why Replacement Matters:

• The timing chain system is one of the most critical components within the engine, controlling the relationship between the crankshaft and camshafts. Although small, the split link plays a vital role in maintaining the integrity of the entire timing chain assembly.
• Over time, wear, corrosion, fatigue or damage during servicing can compromise the strength of the split link. A weakened or damaged link may accelerate chain wear or increase the risk of timing chain failure. Because timing-related failures can result in significant engine damage and costly repairs, replacing worn timing chain components during maintenance or engine rebuilds is highly recommended.

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

911327339990

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Camshaft timing gear / Drive sprocket.
This camshaft timing gear is a direct-fit replacement for the factory Porsche drive gear, it ensures accurate chain engagement, quiet operation, and long-term reliability. 
Fits: Left or Right, Sold each.

Fits:
Porsche 911 1965 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram ref no 22.

This sprocket (gear) is part of the timing / camshaft drive system, engaging with the timing chain (or drive chain) to convert crankshaft rotational motion into synchronized camshaft motion. It ensures that the camshafts open and close valves at the correct moments relative to piston position, essential for proper combustion, engine efficiency, and emissions. Accurate tooth profile, hardness, and alignment are crucial—improperly manufactured or worn sprockets can lead to timing drift, noise, chain jump, or catastrophic engine damage.

Original stock / old timing gears can wear, fatigue, or lose tooth integrity over time — especially under heat cycles and chain load. A worn or mismatched sprocket may cause timing chain noise (ticking, rattle), timing drift, or—worst case—chain jump or engine damage. An new replacement restores correct tooth geometry, material hardness, and precision alignment, ensuring the timing system operates smoothly and reliably.

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

90110554604

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Camshaft Timing Chain. CLOSED TYPE.
OE Match camshaft timing chain - the primary chain that connects the crankshaft to the camshaft(s) and synchronises their rotation. It corresponds to Porsche OEM ref 993.105.529.00, which was used in Porsche 911 1965 - 1997 models.
Fits left or right. Sold each.

Fits:
Porsche 911 1965 - 1989
Porsche 964 1991 - 1993
Porsche 993 1994 - 1997

Diagram ref no 1

The camshaft timing chain is a critical engine component that maintains precise timing between the crankshaft and camshaft(s). This timing governs when the engine’s intake and exhaust valves open and close relative to piston position - a key factor in efficient combustion, engine power, emissions, and overall drivability. The chain connects the rotating crankshaft to the camshafts so that valve timing is mechanically linked and constant.

Function:
• Synchronises engine timing: Maintains crankshaft-to-camshaft rotation alignment
• Supports combustion efficiency: Ensures accurate valve events for intake and exhaust strokes
• Transfers mechanical drive: From crankshaft to camshaft drive mechanisms
• Withstands high loads: Engine torque and RPM forces over long service life.

Unlike timing belts, timing chains are metal-to-metal and designed for durability, although they can stretch or wear with high mileage or inadequate lubrication.

The timing chain is at the heart of the engine’s mechanical timing system. While chains are generally long-lasting, wear can occur due to mileage, heat cycling, lubrication contamination, or slack from chain stretch. A worn or stretched timing chain can lead to:
•  Incorrect valve timing
•  Engine noise (rattle at startup or idle)
•  Reduced power and efficiency Irregular idle and misfires
•  Potential catastrophic engine damage if timing deviates too far.

Replacing a worn chain with an OE Match unit restores correct timing precision and helps protect major internal engine components.

When to replace. Install a new timing chain when:
•  There is timing chain noise (rattling) at startup or idle
•  Chain tensioner or guides are being replaced
•  Engine has high mileage with original timing components
•  You are performing engine rebuild, top-end service, or head removal
•  Diagnostic codes indicate timing inconsistencies

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

99310552900

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Camshaft sprocket flange. Fits Left or Right Camshaft.



Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 914 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 36

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

90110558302

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Camshaft Timing Chain With Master Link.

Fits:
Porsche 911 1965>>1989
Porsche 964 1991>>1993

Diagram Ref No 1

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91110552951

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CAM BOLT TOOL for 911 3.2 CARRERA / 964



STOMSKI RACING's version of the P9191 tool combines the basics of the factory tool and improves on it by adding an integral 19mm bushed socket that prevents slippage and rounding off of the cam bolt on the end of the 3.2 cam shafts.
The cam bolt on the 3.2 Carrera requires a torque of 88 foot pounds. Tightening the bolt to this spec, or loosening it using a breaker bar and the factory long-armed cam tool, requires dexterity, leverage, and serious luck that the deep socket does not slip off the head of the bolt, rounding it over, or busting knuckles in the process.
STOMSKI RACING's SR9191 securely holds an impact-quality socket in the center of a precision machined hardened steel socket, ensuring ease and accuracy in loosening the bolt, or setting the required torque. The bushing prevents the socket from being leveraged off the bolt head, keeping it squarely in place for the most accurate torque and security during installation and removal.

The SR9191 replaces both the factory P9191 tool and our SR078.

Related reference numbers
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SR9191

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Camshaft sprocket flange. Fits Left or Right Camshaft.
Material: Steel
Inside Diameter: 30 MM

Fits:
Porsche 911 1965-89
Porsche 930 1978-79
Porsche 914 1970-76

Diagram ref no 36

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

90110558302

The product you are viewing cross references to these numbers

Camshaft timing chain. Fits left or right CLOSED TYPE.



TIP! If you detect a chain clap or rattling noise in the engine, your timing chain may be worn or stretched and needs replacing. each car has two

Fits:
Porsche 911 1965-89
Porsche 964 1991-93
Porsche 993 1994-97

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

99310552900

The product you are viewing cross references to these numbers