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Porsche > 991 (911) MK1 2012-2016 > Engine Rebuild Parts >

Chains & Tensioners

Chains & Tensioners

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Timing Chain, Oil Pump / Crankshaft. Porsche 991.1 R / GT3 RS 4.0L 2015-16 - 9A110523391
2
Timing Chain, Oil Pump / Crankshaft. Porsche 991.1 R / GT3 RS 4.0L 2015-16
Special Order item
9A110523391
Product Information
Product Information
Timing Chain, Oil Pump / Crankshaft.
The PORSCHE Timing Chain, Oil Pump / Crankshaft 9A110523391 is a genuine Porsche internal engine drive component designed to transfer mechanical rotation between the crankshaft drive system and the engine oil pump on compatible Porsche applications.

Fits:
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16 
 
Diagram Ref No 2

The oil pump must operate continuously while the engine is running to circulate lubricant to critical internal components. This chain provides the mechanical drive required for that operation, helping maintain dependable engine lubrication and protection of bearings, timing components and other moving surfaces.

Although designed for long service life, continuous mechanical loading, heat, friction and lubrication conditions can gradually cause wear to the chain and associated components. Excessive chain elongation or damage can create slack, abnormal noise and, in severe cases, compromise the mechanical drive to the oil pump.

What This Product Does:
The chain transfers rotational movement from the crankshaft drive system to the engine oil pump.

As the engine rotates, this mechanical drive allows the oil pump to circulate engine oil through the lubrication system.

Reliable oil circulation supports lubrication of critical components such as:

  • Crankshaft bearings
  • Connecting-rod bearings
  • Camshaft and valvetrain components
  • Timing chains and sprockets
  • Timing-chain guides and tensioners
  • Other internal moving components and friction surfaces

The chain itself does not generate oil pressure. Its purpose is to mechanically drive the oil pump. The pump, pressure-control system and lubrication circuit are responsible for producing and regulating oil flow and pressure.

Symptoms Of Wear Or Failure:
Possible symptoms of deterioration within the chain or associated drive system include:

  • Metallic rattling or clattering
  • Mechanical chain noise from the engine
  • Noise that changes with engine RPM
  • Rattle during engine start-up
  • Excessive chain slack
  • Chain elongation
  • Excessive chain movement
  • Visible wear to chain links or pins
  • Abnormal sprocket wear
  • Worn or damaged chain guides, where fitted
  • Excessive tensioner travel, where applicable
  • Metal or plastic debris in the engine oil
  • Wear debris found in the oil filter
  • Oil-pressure warning light
  • Low oil-pressure warning message
  • Oil-pressure-related diagnostic faults
  • Abnormal engine noise associated with inadequate lubrication

An oil-pressure warning does not automatically mean the chain has failed. Low oil level, oil pump wear, a blocked pickup, pressure-regulation faults, excessive bearing clearance, incorrect oil or a defective pressure sensor can produce similar symptoms.

Why Replacement Matters:
The Timing Chain performs a critical mechanical role within the engine lubrication system.

Replacing a confirmed worn, elongated or damaged chain can help:

  • Restore reliable oil pump drive
  • Maintain dependable engine oil circulation
  • Reduce excessive chain slack
  • Reduce abnormal mechanical noise
  • Restore reliable sprocket engagement
  • Protect associated sprockets
  • Protect chain guides and tensioning components
  • Reduce the risk of chain derailment
  • Reduce the risk of chain breakage
  • Support correct engine lubrication
  • Protect bearings and other internal components
  • Reduce the risk of lubrication-related engine damage

Because reliable lubrication is fundamental to engine operation, confirmed wear or damage within the oil pump drive system should not be ignored.



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

9A110523391
9A110523391

The product you are viewing cross references to these numbers
Timing Chain, Oil Pump / Crankshaft. Porsche 991.1 R / GT3 RS 4.0L 2015-16 - 9A110523391 - 50090163
2
Timing Chain, Oil Pump / Crankshaft. Porsche 991.1 R / GT3 RS 4.0L 2015-16
9A110523391/1
Product Information
Product Information
Timing Chain, Oil Pump / Crankshaft.
The IWIS Timing Chain, Oil Pump / Crankshaft is a replacement internal engine drive chain for compatible Porsche applications. It forms part of the engine lubrication system and provides the mechanical drive connection between the crankshaft drive and engine oil pump.

Fits:
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16 
 
Diagram Ref No 2

The oil pump must operate continuously while the engine is running to circulate lubricant to critical internal components. This chain provides the mechanical drive required for that operation, helping maintain dependable engine lubrication and protection of bearings, timing components and other moving surfaces.

Although designed for long service life, continuous mechanical loading, heat, friction and lubrication conditions can gradually cause wear to the chain and associated components. Excessive chain elongation or damage can create slack, abnormal noise and, in severe cases, compromise the mechanical drive to the oil pump.

What This Product Does:
The chain transfers rotational movement from the crankshaft drive system to the engine oil pump.

As the engine rotates, this mechanical drive allows the oil pump to circulate engine oil through the lubrication system.

Reliable oil circulation supports lubrication of critical components such as:

  • Crankshaft bearings
  • Connecting-rod bearings
  • Camshaft and valvetrain components
  • Timing chains and sprockets
  • Timing-chain guides and tensioners
  • Other internal moving components and friction surfaces

The chain itself does not generate oil pressure. Its purpose is to mechanically drive the oil pump. The pump, pressure-control system and lubrication circuit are responsible for producing and regulating oil flow and pressure.

Symptoms Of Wear Or Failure:
Possible symptoms of deterioration within the chain or associated drive system include:

  • Metallic rattling or clattering
  • Mechanical chain noise from the engine
  • Noise that changes with engine RPM
  • Rattle during engine start-up
  • Excessive chain slack
  • Chain elongation
  • Excessive chain movement
  • Visible wear to chain links or pins
  • Abnormal sprocket wear
  • Worn or damaged chain guides, where fitted
  • Excessive tensioner travel, where applicable
  • Metal or plastic debris in the engine oil
  • Wear debris found in the oil filter
  • Oil-pressure warning light
  • Low oil-pressure warning message
  • Oil-pressure-related diagnostic faults
  • Abnormal engine noise associated with inadequate lubrication

An oil-pressure warning does not automatically mean the chain has failed. Low oil level, oil pump wear, a blocked pickup, pressure-regulation faults, excessive bearing clearance, incorrect oil or a defective pressure sensor can produce similar symptoms.

Why Replacement Matters:
The Timing Chain performs a critical mechanical role within the engine lubrication system.

Replacing a confirmed worn, elongated or damaged chain can help:

  • Restore reliable oil pump drive
  • Maintain dependable engine oil circulation
  • Reduce excessive chain slack
  • Reduce abnormal mechanical noise
  • Restore reliable sprocket engagement
  • Protect associated sprockets
  • Protect chain guides and tensioning components
  • Reduce the risk of chain derailment
  • Reduce the risk of chain breakage
  • Support correct engine lubrication
  • Protect bearings and other internal components
  • Reduce the risk of lubrication-related engine damage

Because reliable lubrication is fundamental to engine operation, confirmed wear or damage within the oil pump drive system should not be ignored.



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

9A110523391
9A110523391

The product you are viewing cross references to these numbers
Timing Chain. Porsche 987.2 & 981 Boxster / 987C.2 & 981C Cayman / 997.2 / 991.1 - 9A110514203, 9A110514202 - 34971
3
Timing Chain. Porsche 987.2 & 981 Boxster / 987C.2 & 981C Cayman / 997.2 / 991.1
9A110514203/1
Product Information
Product Information
Timing chain
OE Match timing chain for Porsche Boxster, Cayman, 997, and 991 models. This replacement timing chain helps maintain accurate camshaft timing and reliable engine operation.
Sold individually

Fits:
Porsche 987.2 Boxster 2009 - 2012
Porsche 981 Boxster 2012 - 2016
Porsche 987C.2 Cayman 2009 - 2012
Porsche 981C Cayman 2013 - 2016
Porsche 997.2 2009 - 2012
Porsche 991.1 2012 - 2016

Diagram ref no 1

The timing chain synchronises engine rotation between the crankshaft and camshafts. Correct timing chain operation is essential for accurate valve timing, smooth running, engine performance, and long-term reliability.

Functions
• Replaces the engine timing chain
• Helps synchronise crankshaft and camshaft movement
• Supports accurate valve timing
• Helps maintain smooth engine running and performance
• Used during timing chain, camshaft drive, or engine rebuild service
• Replaces stretched, noisy, worn, or damaged timing chains
• OE Match replacement for Porsche engine timing system repair.

Why Replace This Part?
Timing chains are highly loaded engine components and can wear, stretch, become noisy, or suffer damage over time. A worn or stretched timing chain may cause timing noise, poor running, fault codes, reduced performance, or incorrect camshaft timing. Replacing the timing chain helps restore correct engine timing and protects related timing system components.

When to Replace This Part
•  Timing chain noise or rattle is present
•  Timing chain stretch is detected
•  Camshaft timing faults or related engine codes are present
•  Engine performance is reduced or running is uneven
•  Timing chain guides, tensioners, or camshaft drive parts are being replaced
•  Engine rebuild or major timing service is being carried out
•  Preventative replacement is required during Porsche engine maintenance

Where it fits on the car
This timing chain fits within the engine timing / camshaft drive system on Porsche Boxster, Cayman, 997, and 991 models. Exact chain position can vary depending on engine type and timing layout.

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

9A110514203
9A110514203
9A110514202

The product you are viewing cross references to these numbers
Timing Chain. Porsche 987.2 / 981 / 982 Boxster / Cayman / 997.2 / 991.1 / 991.2 2009>> - 9A110523302
3
Timing Chain. Porsche 987.2 / 981 / 982 Boxster / Cayman / 997.2 / 991.1 / 991.2 2009>>
Special Order item
9A110523302
Product Information
Product Information
Timing Chain.
Restore your Porsche’s timing drive system with this genuine OEM chain. Designed for Porsche 987.2 / 981 / 982 Boxster / Cayman / 997.2 / 991.1 / 991.2 2009>> fitments, this timing chain drives the crank to oil pump/cam chain path. If your engine is showing timing cover noise, fault codes or high mileage, a new timing chain is key to maintaining performance and reliability.

Fits:
  • Porsche Boxster 987 MKII 2.9L 2009-2012
  • Porsche Boxster S 987 MKII 3.4L 2009-2012
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 981 Spyder 3.8L 2016
  • Porsche Boxster 718 2.0L Manual (300 Bhp)
  • Porsche Boxster 718 2.0L PDK (300 Bhp)
  • Porsche Boxster S 718 2.5L Manual (350 Bhp)
  • Porsche Boxster S 718 2.5L PDK (350 Bhp)
  • Porsche Boxster T 718 2.0L Manual (300 Bhp)
  • Porsche Boxster T 718 2.0L PDK (300 Bhp)
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII Carrera C4S 3.8L 2009-12
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 997 MKII GT2 RS 2011-13
  • Porsche 991.1 Carrera C2 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C2S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C4S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560Bhp) 2014-16
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 3.8L (475Bhp) 2014-16
  • Porsche 991.1 GT3 RS 4.0L (500Bhp) 2015-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L Manual (300Bhp)
  • Porsche Cayman 718 2.0L PDK (300Bhp)
  • Porsche Cayman S 718 2.5L Manual (350Bhp)
  • Porsche Cayman S 718 2.5L PDK (350Bhp)
  • Porsche Cayman T 718 2.0L Manual (300Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)  


Diagram Ref No 10

What This Product Does:

  • The timing chain synchronises the crankshaft with other components — here especially linking to the oil pump / cam drive path — so that the engine’s valves operate at the correct times relative to piston movement.
  • Over time, chains can stretch, guides may wear, tensioners may degrade — all of which will allow slack in the drive, noise, timing drift or even failure.
  • Essentially, this chain is a critical link in the engine’s timing system — it must stay within spec to ensure the engine runs as designed.

When You Should Consider Replacement:
  • Rattling or clattering noise from the engine’s timing‐cover area, especially on cold start, idle or at low revs. Slack chain often causes this.
  • Timing-related fault codes — cam/ crank correlation errors, or variable valve timing issues that could stem from chain/tensioning irregularity.
  • Loss of engine performance, rough running, mis-fires, or inconsistent response — because timing drift can affect the engine’s breathing and ignition.
  • High mileage or long service interval without chain replacement — wear accumulates even if symptoms are subtle.
  • Visual inspection (where possible) may show wear or elongation in chain links, damaged guides or tensioner issues.

Why Replacement Matters:
  • Engine protection: A failed or excessively worn timing chain can cause piston-valve contact, or major internal engine damage. Replacing the chain significantly reduces that risk.
  • Maintains timing accuracy: A new chain ensures correct timing events — vital for power delivery, engine smoothness, efficiency and longevity.
  • Noise & NVH improvement: Slack or worn chain components often produce unwanted noise and degrade refinement — renewed parts improve comfort.
  • Cost-efficiency: Since accessing the chain involves significant labour (front engine cover, oil pump, possibly other removal), replacing the chain while you’re already in saves repeated work.



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

9A110523302
9A110523302

The product you are viewing cross references to these numbers
Timing Chain. Porsche 987.2 / 981 / 982 Boxster / Cayman / 997.2 / 991.1 / 991.2 2009>> - 9A110523302 - 50046692
2
Timing Chain. Porsche 987.2 / 981 / 982 Boxster / Cayman / 997.2 / 991.1 / 991.2 2009>>
9A110523302/2
Product Information
Product Information
Timing Chain.
The IWIS Timing Chain  is a replacement internal engine timing component for compatible Porsche applications. The timing chain forms part of the engine's mechanical timing system, helping maintain accurate synchronisation between the crankshaft, camshaft drive and associated timing components.

Fits:
  • Porsche Boxster 987 MKII 2.9L 2009-2012
  • Porsche Boxster S 987 MKII 3.4L 2009-2012
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 981 Spyder 3.8L 2016
  • Porsche Boxster 718 2.0L Manual (300 Bhp)
  • Porsche Boxster 718 2.0L PDK (300 Bhp)
  • Porsche Boxster S 718 2.5L Manual (350 Bhp)
  • Porsche Boxster S 718 2.5L PDK (350 Bhp)
  • Porsche Boxster T 718 2.0L Manual (300 Bhp)
  • Porsche Boxster T 718 2.0L PDK (300 Bhp)
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII Carrera C4S 3.8L 2009-12
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 997 MKII GT2 RS 2011-13
  • Porsche 991.1 Carrera C2 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C2S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C4S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560Bhp) 2014-16
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 3.8L (475Bhp) 2014-16
  • Porsche 991.1 GT3 RS 4.0L (500Bhp) 2015-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L Manual (300Bhp)
  • Porsche Cayman 718 2.0L PDK (300Bhp)
  • Porsche Cayman S 718 2.5L Manual (350Bhp)
  • Porsche Cayman S 718 2.5L PDK (350Bhp)
  • Porsche Cayman T 718 2.0L Manual (300Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)  


Diagram Ref No 10

What This Product Does:

  • The timing chain synchronises the crankshaft with other components — here especially linking to the oil pump / cam drive path — so that the engine’s valves operate at the correct times relative to piston movement.
  • Over time, chains can stretch, guides may wear, tensioners may degrade — all of which will allow slack in the drive, noise, timing drift or even failure.
  • Essentially, this chain is a critical link in the engine’s timing system — it must stay within spec to ensure the engine runs as designed.

When You Should Consider Replacement:
  • Rattling or clattering noise from the engine’s timing‐cover area, especially on cold start, idle or at low revs. Slack chain often causes this.
  • Timing-related fault codes — cam/ crank correlation errors, or variable valve timing issues that could stem from chain/tensioning irregularity.
  • Loss of engine performance, rough running, mis-fires, or inconsistent response — because timing drift can affect the engine’s breathing and ignition.
  • High mileage or long service interval without chain replacement — wear accumulates even if symptoms are subtle.
  • Visual inspection (where possible) may show wear or elongation in chain links, damaged guides or tensioner issues.

Why Replacement Matters:
  • Engine protection: A failed or excessively worn timing chain can cause piston-valve contact, or major internal engine damage. Replacing the chain significantly reduces that risk.
  • Maintains timing accuracy: A new chain ensures correct timing events — vital for power delivery, engine smoothness, efficiency and longevity.
  • Noise & NVH improvement: Slack or worn chain components often produce unwanted noise and degrade refinement — renewed parts improve comfort.
  • Cost-efficiency: Since accessing the chain involves significant labour (front engine cover, oil pump, possibly other removal), replacing the chain while you’re already in saves repeated work.



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

9A110523302
9A110523302

The product you are viewing cross references to these numbers
Timing chain. Porsche 997 GT3 / 991.1 GT3 - 99710555190
2
Timing chain. Porsche 997 GT3 / 991.1 GT3
Special Order item
99710555190
Product Information
Product Information
Timing chain.

Fits:
Porsche 997 GT3 RS 3.8L 2010>>
Porsche 997 GT3 RS 2011>>
Porsche 997 GT3 Cup 3.8L 2010>>
Porsche 991.1 GT3 Cup 3.8L 2013-16

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

99710555190
99710555190

The product you are viewing cross references to these numbers
Timing Chain. Porsche 997 GT3 / 991.1 GT3 - 99710555190 - 50036290
2
Timing Chain. Porsche 997 GT3 / 991.1 GT3
99710555190/1
Product Information
Product Information
Timing Chain.
The IWIS Timing Chain is a replacement internal engine timing component for compatible Porsche applications. It forms part of the engine's mechanical timing drive and helps maintain the precise synchronisation required between associated rotating and valve-train components.

Fits:
  • Porsche 997 MK1 GT3 / GT3 RS 2007-09
  • Porsche 997 MKII GT3 / GT3 RS 2010-11
  • Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16  

Diagram Ref No 27

Timing chains are designed for extended service life, but they operate continuously whenever the engine is running. Repeated mechanical loading, friction, heat and lubrication conditions can gradually cause wear to the chain pins, links and contact surfaces. Associated guides, tensioners and sprockets can also deteriorate over time.

As wear develops, the chain's effective length can increase, creating excessive slack and potentially affecting timing accuracy. Severe deterioration can allow the chain to jump, derail or fail, creating a risk of significant internal engine damage.

What This Product Does:
The timing chain transfers rotational movement through the engine timing system while maintaining the required mechanical relationship between associated components.

Depending on the specific engine configuration, it helps support:

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

Correct chain tension, adequate lubrication and accurate engagement with the associated sprockets are essential for dependable timing-system operation.

Symptoms Of Wear Or Failure:
Possible symptoms of timing-chain or associated timing-system wear include:

  • Metallic rattling or clattering
  • Rattle during cold starts
  • Noise immediately after engine start-up
  • Mechanical noise from the timing area
  • Excessive chain slack
  • Timing-chain elongation
  • Noise that changes with engine RPM
  • Rough or irregular engine operation
  • Unstable idle
  • Difficult starting
  • Reduced engine performance
  • Misfires
  • Engine warning light
  • Timing-related diagnostic fault codes
  • Camshaft-position faults
  • Crankshaft/camshaft correlation faults
  • Variable camshaft timing faults where applicable
  • Visible chain wear during inspection
  • Worn or damaged chain guides
  • Abnormal sprocket wear
  • Metal or plastic debris in the engine oil or oil filter

These symptoms do not automatically mean the chain itself has failed. Guides, tensioners, sprockets, lubrication problems and other engine faults can produce similar symptoms, making correct diagnosis important.

Why Replacement Matters:
The timing chain is a critical internal engine component. Once excessive wear, elongation or physical damage has been confirmed, replacement is important for restoring dependable timing-system operation.

Replacing a worn IWIS Timing Chain can help:

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

Continuing to operate an engine with a confirmed timing-chain problem may allow deterioration to progress and substantially increase the cost of the eventual repair.



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

99710555190
99710555190

The product you are viewing cross references to these numbers
Timing Chain. Porsche Boxster / Cayman / 997 / 991 - 9A110514203, 9A110514202
3
Timing Chain. Porsche Boxster / Cayman / 997 / 991
Special Order item
9A110514203
Product Information
Product Information
Timing Chain. Crankshaft To Cam. EACH.



Fits:
Porsche 987.2 Boxster
Porsche 981 Boxster
Porsche 987C.2 Cayman
Porsche 981C Cayman
Porsche 997.2
Porsche 991.1

Price is for each.

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Diagram ref no 1

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

9A110514203
9A110514203
9A110514202

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Torx screw M5x12 throttle control element. Porsche 987.2 / 981 / 718 / 997.2 / 991 - 99907365001
4
Torx screw M5x12 throttle control element. Porsche 987.2 / 981 / 718 / 997.2 / 991
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99907365001
Product Information
Product Information
Torx screw M5x12 throttle control element. 



Fits:
Porsche 987.2 Boxster / Cayman - 2009 to 2012
Porsche 981 Boxster / Cayman - 2012 to 2016
Porsche 718 Boxster / Cayman  - 2017 Onwards
Porsche 997.2 - 2009 to 2012
Porsche 991 - 2012 to 2018


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

99907365001
99907365001

The product you are viewing cross references to these numbers
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About Chains & Tensioners

Precision Timing Chains & Tensioners – Engine Synchronisation and Reliability for Porsche Models

The timing chain system is one of the most critical components of a Porsche engine, ensuring perfect synchronisation between the crankshaft and camshafts. This precise coordination allows valves to open and close at the right moment, maintaining smooth power delivery, fuel efficiency, and long-term engine health.

At Design911, we supply a comprehensive range of precision-engineered timing chains, guides, and hydraulic tensioners designed to meet or exceed manufacturer performance standards. Each component is manufactured from high-strength materials for exceptional wear resistance and durability — vital for high-revving, performance-oriented Porsche engines.

What Do Timing Chains and Tensioners Do?

A timing chain connects the crankshaft to the camshafts, ensuring accurate valve timing. The tensioner keeps the chain taut to prevent slack, vibration, or noise, maintaining precise timing under all load conditions.

Core Functions:

  • Synchronise engine timing between the camshaft and crankshaft.
  • Maintain valve timing accuracy for optimal combustion and power.
  • Prevent chain slack and noise through hydraulic or spring-loaded tensioning.
  • Ensure long-term reliability in both performance and everyday driving.

Together, these components preserve the exacting standards of Porsche engine operation — vital for both power and longevity.

Why Do Timing Chains and Tensioners Fail?

Over time, wear, oil degradation, and heat cycles can cause timing components to deteriorate. When neglected, they may stretch, seize, or lose tension — leading to severe engine damage.

Common Causes of Failure Include:

  • Chain stretch or elongation, resulting in timing misalignment.
  • Worn or leaking hydraulic tensioners, causing chain rattle on start-up.
  • Contaminated or degraded engine oil, accelerating wear.
  • Broken chain guides from heat stress or material fatigue.
  • Insufficient oil pressure, reducing hydraulic tensioner performance.

A failing timing chain system can lead to poor performance, rough idling, check-engine lights, or — in extreme cases — catastrophic valve-to-piston contact.

Why Replace with Performance-Grade Timing Components?

Replacing aging timing components with manufacturer-quality parts ensures reliable valve timing, smoother operation, and peace of mind.

Key Benefits:

  • Restores precise valve timing for peak performance and efficiency.
  • Prevents engine noise and vibration caused by chain slack.
  • Protects against catastrophic engine damage due to chain failure.
  • Constructed from heat-treated, high-grade steel for long service life.
  • Engineered to match original timing profiles for Porsche engines.
  • Perfect fitment for classic air-cooled and modern water-cooled models.

Whether performing preventive maintenance or a complete rebuild, these timing chains and tensioners deliver race-ready reliability with road-tested durability.

Highlights:

  • Precision-engineered timing chains, guides, and tensioners for Porsche engines.
  • Restores timing accuracy and eliminates start-up rattle or misfire issues.
  • Built from heat-treated alloy steel for maximum longevity.
  • Hydraulic and mechanical tensioners available for various Porsche models.
  • Ideal for performance rebuilds and preventative maintenance.
  • Compatible with air-cooled and water-cooled Porsche engines.

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