Timing chain. Porsche 996 / 986  ❭  99610517157

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Related, superseded, cross reference or alternative numbers for comparison.

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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Chain Guide Rail, Brown.
The OE Match Brown Chain Guide Rail is a high-quality replacement timing chain guide designed for Porsche engines. This essential component provides a smooth, low-friction running surface for the timing chain, helping to maintain correct chain alignment and tension while reducing wear within the engine timing system.

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)  

Manufactured from durable wear-resistant material and engineered to OE specifications, this brown chain guide rail is designed to withstand constant contact with the timing chain under high temperatures and demanding operating conditions. It is an important service item during engine rebuilds, timing chain maintenance or timing system overhauls.

What This Product Does:

• Guides and supports the engine timing chain during operation.
• Maintains correct timing chain alignment.
• Helps reduce chain vibration and movement.
• Provides a low-friction wear surface for the chain.
• Supports accurate camshaft and crankshaft timing.
• Contributes to smooth engine operation and long-term reliability.

Symptoms Of Wear Or Failure:

• Timing chain rattling or excessive chain noise.
• Increased engine mechanical noise during start-up.
• Visible wear grooves or scoring on the guide surface.
• Cracked, chipped or broken guide material.
• Excessive timing chain movement.
• Accelerated timing chain wear.
• Inconsistent timing system operation.
• Plastic debris or guide material found during servicing.

Why Replacement Matters:

• Chain guide rails operate under constant load as the timing chain moves at high speed throughout the engine's operating range. Over time, the guide material can wear, harden, crack or become brittle due to heat cycles, oil exposure and age.
• A worn chain guide rail can allow excessive chain movement, increasing stress on the timing chain, sprockets and tensioners. If guide deterioration becomes severe, fragments may break away, potentially leading to accelerated timing system wear and costly engine repairs.

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Related, superseded, cross reference or alternative numbers for comparison.

91110522205

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