Chains & Tensioners

Timing Chain. 2 per engine



Fits:
Porsche 996 3.4L C2 / C4 1998-01
Porsche 986 Boxster 1997-04

Click 'Zoom in' for large parts diagram.
Diagram Ref No 6.

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99610517054

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Timing chain. 1 per engine.



Fits:
Porsche 996 3.4L 1998-00
Porsche 986 Boxster 1997-01

Click 'Zoom in' for large parts diagram.
Diagram Ref No 17.

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Related, superseded, cross reference or alternative numbers for comparison.

99610517157

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Timing chain. 
This OE Match timing chain is a replacement camshaft timing chain for Porsche 996 and 986 Boxster models. It is designed to match the original-style fit and function, helping maintain correct engine timing and reliable valve train operation.
1 per engine

Fits:
Porsche 996 3.4L 1998 - 2000
Porsche 986 Boxster 1997 - 2001

Diagram Ref No 17

The timing chain links the crankshaft drive to the camshaft drive system, keeping the camshafts synchronised with the crankshaft. Correct timing allows the engine valves to open and close at the right moment, supporting 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
•  Replaces stretched, noisy, worn, or damaged timing chains
•  Supports reliable valve train operation
•  OE Match replacement for engine timing repair or rebuild work.

Why Replace This Part?
Timing chains are exposed to constant load, heat, oil, and high-speed engine operation. Over time, a chain can stretch, wear, become noisy, or affect accurate camshaft timing. A worn timing chain may cause rattling noises, poor running, timing deviation faults, reduced performance, or potential engine damage if left unresolved. Replacing the timing chain helps restore accurate timing and long-term engine reliability.

When to Replace This Part
•   The timing chain is stretched, worn, noisy, or damaged
•   There is rattling from the timing chain area
•   Camshaft timing deviation faults are present
•   The engine has poor running, misfires, or reduced performance linked to timing issues
•   Chain guides, tensioners, sprockets, or related timing components are being replaced
•   The engine is being rebuilt or overhauled
•   Preventative replacement is being carried out during major engine service.

Where it fits on the car
This timing chain fits inside the engine timing chain system on Porsche 996 and 986 Boxster models. It forms part of the camshaft drive arrangement and should be installed according to the factory timing layout and engine specification.

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

99610517157

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Timing Chain. 2 per engine. Sold each



Fits:
Porsche 996 3.4L C2/C4 1998-01
Porsche 986 Boxster 1997-04

Click 'Zoom in' for large parts diagram.
Diagram ref No 26.

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

99610517753

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Engine timing chain. CLOSED TYPE.
OE Match replacement engine timing chain - also referred to as the camshaft/intermediate shaft timing chain - designed to replicate the original Porsche timing chain used in the engine timing drive system of early 911 (996) and Boxster engines.
2 per engine. Sold each.

Fits:
Porsche 996 3.4L C2/C4 1998 - 2001
Porsche 986 Boxster 1997 - 2004

Diagram Ref No 26.

The timing chain ensures precise mechanical synchronization between critical rotating components of the engine - primarily the crankshaft and camshafts (and in some layouts, the intermediate shaft). It maintains the correct timing of valve opening and closing events relative to piston position, which is vital for efficient combustion, smooth engine operation, and proper power delivery.

Function:
•  Synchronises rotation of the crankshaft and camshafts
•  Maintains correct valve timing for intake and exhaust events
•  Transfers mechanical drive through intermediate gears/shafts
•  Supports reliable engine performance and emissions control.

A worn or elongated timing chain can cause timing errors, engine noise, rough running, or in more severe cases, engine damage if the timing relationship is lost.

The timing chain is a critical engine component. Over long service intervals and high mileage, the chain can stretch or wear, leading to slack, improper timing, and noisy operation. If not addressed, timing chain issues can cause:
•  Engine noise (chain rattle)
•  Poor idle and power delivery
•  Timing inaccuracies affecting combustion
•  Potential engine damage if timing is lost.

Replacing worn chains with an OE Match unit helps ensure accurate timing, preserves engine performance, and protects other internal engine components.

When to replace. Replace the timing chain when:
•  There is rattling or slapping noise from the timing cover area
•  Timing chain slack is detected in inspection
•  You are performing an engine rebuild or overhaul
•  Timing tensioner or guides show wear
•  Irregular idle or misfires suggest timing drift

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

99610517753

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Timing Chain. 1 per engine

Fits:
Porsche 996 GT3

Porsche 997 GT3

Diagram Ref No 17.

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95910555201

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Timing Chain.
The IWIS Timing Chain is a replacement internal engine timing component for compatible Porsche applications. Designed to operate as part of the engine's mechanical timing drive, the chain transfers rotational movement between associated timing components while maintaining the precise mechanical relationship required for correct engine operation.

Fits:

• Porsche 996 GT3 MKI 1999-02
• Porsche 996 GT3 MKII 2003>>
• Porsche 996 GT3 RS 2003-04
• Porsche 997 MK1 GT3 / GT3 RS 2007-09  

Diagram Ref No 23

Timing chains are designed for extended service life, but they are still subject to continuous mechanical loading, friction and heat. Wear can gradually develop at the chain pins, links and contact surfaces, while associated guides, tensioners and sprockets can also deteriorate.

Excessive chain wear or elongation can create additional slack, abnormal mechanical noise and inaccurate engine timing. If a severely worn chain jumps, derails or fails, significant internal engine damage may result.

What This Product Does:
The timing chain forms part of the mechanical system responsible for keeping critical engine components correctly synchronised.

Its primary role is to transfer rotational drive while maintaining the required timing relationship between associated components.

Depending on the engine's timing-system design, this helps support:

• Accurate engine timing
• Correct camshaft operation
• Correct valve timing
• Reliable mechanical synchronisation
• Consistent rotational drive
• Smooth engine operation
• Stable combustion
• Predictable power delivery

Correct chain tension and accurate engagement with the associated sprockets are essential for reliable timing-system operation.

Symptoms Of Wear Or Failure:

• Possible symptoms of timing-chain or related timing-system wear include:
• Metallic rattling or clattering
• Timing-chain noise during cold starts
• Rattle immediately after starting
• Excessive chain slack
• Timing-chain elongation
• Mechanical noise at idle
• Noise that changes with engine RPM
• Rough or irregular engine operation
• Unstable idle
• Difficult starting
• Reduced engine performance
• Engine warning light
• Timing-related diagnostic fault codes
• Crankshaft/camshaft correlation faults where applicable
• MisfiresVisible chain wear during inspection
  
• Damaged or excessively worn chain guides
• Abnormal sprocket wearMetal or plastic debris in the engine oil or filter

These symptoms are not exclusive to the chain itself. Guides, tensioners, sprockets, lubrication problems and other engine faults can produce similar symptoms, so correct diagnosis is essential.

Why Replacement Matters:
The timing chain is a critical internal engine component.

Replacing a confirmed worn, elongated or damaged IWIS Timing Chain can help:

• Restore dependable timing-system operation
• Maintain accurate mechanical synchronisation
• Restore correct timing-chain tension
• Reduce excessive chain movement
• Reduce abnormal timing-chain noise
• Maintain reliable sprocket engagement
• Protect associated chain guides
• Protect timing sprockets
• Reduce the risk of timing deviation
• Reduce the risk of the chain jumping or derailing
• Support smooth engine operation
• Protect expensive internal engine components

Continuing to operate an engine with a confirmed timing-chain problem can allow wear to progress and increase the likelihood of a substantially more expensive repair.

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

95910555201

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Timing chain. 2 per engine. Price is for each



Fits:
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram.
Diagram Ref No 23

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

99610555271

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Timing Chain
OE Match timing chain for the valve control system of Porsche 996 Turbo and 996 GT2 models from 2001–05. It replaces OE reference 99610555271, with two chains required per engine.cc
2 per engine. Price is for each

Fits:
Porsche 996 Turbo 200 - 2005
Porsche 996 GT2 2001 - 2005

Diagram ref no 23

What This Product Does

The timing chain forms part of the engine's valve control assembly, mechanically linking rotating timing components so that the camshafts remain synchronised with the crankshaft and intermediate shaft. Correct chain condition is essential for maintaining the specified valve timing.

Functions

• Transfers drive through the engine timing system
• Maintains camshaft and crankshaft synchronisation
• Supports accurate valve opening and closing
• Works with the timing sprockets, guides and tensioning components

Technical Details

• Brand: OE Match
• Part type: engine timing chain
• OE reference: 99610555271
• Application: Porsche 996 Turbo and 996 GT2, 2001–05
• Quantity required: 2 per engine
• Price is for each

Symptoms of Fault

• Rattling or persistent chain noise, particularly during start-up
• Rough running caused by timing deviation
• Timing-related fault codes or warning lights
• Noise that becomes more noticeable as engine speed or load increases
• Metallic debris discovered during oil or filter inspection
• Visible wear affecting associated guides or sprockets

Why Replacement Matters

A worn or elongated timing chain can introduce unwanted movement into the valve timing system. Replacement may be required during an engine rebuild, when abnormal chain noise is diagnosed or when related guides and tensioning parts show wear. Inspecting the surrounding sprockets, guides, tensioners and fixings at the same time can help identify supporting components that also require renewal.

FAQs

• How many chains are needed?
  Two are required per engine. This product is supplied individually.
• Should other timing components be inspected?
  Yes. Guides, sprockets and tensioning components should be checked for wear while the timing system is accessible.
• Does a brief start-up rattle always indicate chain failure?
  Not necessarily. Oil pressure, tensioner condition and other timing components should be assessed before parts are replaced.

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

99610555271

The product you are viewing cross references to these numbers