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- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
2x 99610517353/1 - OE Match Timing Chain Guides
2x 99610517552/1 - OE Match Timing Chain Tensioner Guides
Manufactured to closely replicate the original Porsche components, this set provides a complete replacement for the timing chain guide and tensioner guide wear surfaces on compatible Porsche engines.
Fits:
Porsche 986 Boxster 2.5L / 2.7L / 3.2L 1997 - 2002
Porsche 996 3.4L 1998 - 2001
Diagram Ref No 33 & 30
The timing chain guide & tensioner guide set includes four precision-engineered plastic guides designed to match the original Porsche timing system components in fit, shape, and performance. When installed, these guides support the timing chain and help maintain correct chain tension and alignment throughout engine operation.
The timing chain guides and tensioner guides provide support and controlled routing for the timing chain, keeping it properly positioned as it rotates over the cam and crank sprockets. They work with the hydraulic tensioner to maintain correct chain tension, helping preserve accurate valve timing and reduce chain slack or noise.
Function:
• Timing Chain Guides (OE ref no 99610517353): Provide a wear-resistant surface that the timing chain runs against, supporting proper alignment and reducing chain vibration.
• Tensioner Guides (OE ref no 99610517552): Work in conjunction with the timing chain tensioner to keep chain tension stable, absorbing dynamic loads and preventing slack or chain chatter.
Together, the guides help ensure smooth, quiet chain operation, accurate timing, and long-term engine reliability.
Timing chain guides and tensioner guides are wear items in Porsche engines. Over time, original guide surfaces can wear, crack, or generate plastic debris due to heat and friction. Worn guides can lead to chain slack, noise, inaccurate valve timing, or accelerated chain and sprocket wear. Replacing them with OE Match components restores proper chain support, reduces operational noise, and helps protect expensive internal timing components.
When to replace:
• During timing chain service or overhaul
• If timing chain rattle / noise is detected at start-up or idle
• When engine has high mileage
• If prior guides show wear, cracking, or plastic debris
• As part of preventive maintenance on performance or daily-use engines
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610517353KIT
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
This set includes four Genuine Porsche OEM timing system components used in the timing chain assembly of Porsche engines:
2 × 99610517353 – Genuine Porsche Timing Chain Guides
2 × 99610517552 – Genuine Porsche Timing Chain Tensioner Guides
These parts are factory-original Porsche components engineered to the exact specifications used on production vehicles, ensuring proper fit, material performance, and long-term reliability.
Fits:
Porsche 986 2.5L / 2.7L / 3.2L Boxster 1997 - 2001
Porsche 996 3.4L 1998 - 2001
Diagram ref no 33 & 30
These OEM components are critical wear surfaces that support the timing chain’s routing and tension control, helping maintain accurate valve timing and quiet operation throughout the engine’s service life. Sold as a complete set, this kit is ideal when performing timing belt/chain servicing, major engine overhauls, or preventive maintenance on engines susceptible to guide degradation due to age or mileage.
• Timing Chain Guides (99610517353) - Provide stable support surfaces for the timing chain, maintaining its path over the sprockets and preventing lateral movement or unwanted vibration.
• Timing Chain Tensioner Guides (99610517552) - Work with the hydraulic tensioner to maintain correct chain tension, absorbing dynamic loads and helping prevent slack, noise, or chain wear.
Together, these guides help deliver stable, accurate timing chain function - crucial for maintaining precise cam/crank synchronization and long-term engine durability.
Timing chain guides and tensioner guides are wear components that degrade naturally over time due to friction, heat, and engine operation cycles. Deteriorated guides can contribute to timing chain noise, vibration, and inaccurate timing tension - potentially leading to premature chain and sprocket wear or timing system damage. Installing Genuine Porsche OEM guides restores the exact engineered surfaces and helps ensure timing accuracy, quiet operation, and long-term reliability.
When to replace:
• During scheduled timing system service or timing chain inspection
• If the engine exhibits chain rattle or timing-related noise
• After significant mileage or high-temperature operation
• When rebuild or overhaul procedures remove the original guides
• As part of preventive maintenance in performance or daily drivers
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610517353KIT.OE
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01

This timing chain kit includes the timing chains for the
camshaft and intermediate shaft, as well as the slide and tension rails.
Due to the complex design with an intermediate shaft and two
overhead camshafts, the water boxers of the modern Porsche 911 Carrera and
Boxster have a variety of chains and slide rails. These vary depending on the
displacement or model year, even within a series.
The chain guides were slightly changed between the 3.4L and
3.6L Carrera engines from 2001 to 2002. The engines of the 911 turbo and GT
models, however, are based on the proven 911 technology from the previous
models. The timing chains as well as slide rails and tensioning rails for the
valve control are fundamentally different.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
ENGINEKIT12
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
3 per engine. Price is for each.

Fits:
Porsche 996
Porsche 986 Boxster
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997.1 Gen
Click 'Zoom in' for large parts diagram.
Diagram ref no 25
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970734440
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
3 per engine. Price is for each.

Fits:
Porsche 996
Porsche 986 Boxster
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997.1 Gen
Click 'Zoom in' for large parts diagram.
Diagram ref no 37
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90012314730
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
3 per engine. Price is for each.
Fits:
Porsche 996
Porsche 986 Boxster
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997.1 Gen
Click 'Zoom in' for large parts diagram.
Diagram ref no 37
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90012314730
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 986 2.5L Boxster - 1997-99
Porsche 986 2.7L Boxster >>August 15th, 2000 up to M96.22 65100500 with roller-type chain
Porsche 986 3.2L Boxster S >>August 15th, 2000 up to M96.21 67100500 with roller-type chain
Porsche 996 3.4L 2000 >>August 15th, 2000 up to M96.04 66100500 with roller-type chain
Diagram ref no 35
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610518059
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
The Chain Tensioner Adjuster is a critical component in your engine’s timing system. Designed to maintain the correct tension on the timing chain, it ensures smooth, accurate synchronization between the crankshaft and camshafts for reliable performance.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L >>August 15th, 2000 up to M96.22 65100500 with roller-type chain
- Porsche Boxster S 986 3.2L >>August 15th, 2000 up to M96.21 67100500 with roller-type chain
M96.20 / M96.21 / M96.22
- Porsche 996 C2 3.4L 1997-08/01 >>August 15th, 2000 up to M96.04 66100500 with roller-type chain
- Porsche 996 C4 3.4L 1997-08/01
>>August
15th, 2000 up to M96.04 66100500 with roller-type chain
M96.01 / M96.02 / M96.04
Diagram Ref No 35
What This Product Does:
The chain tensioner adjuster is a vital component in Porsche engines that use timing chains. Its role is to keep the timing chain under correct tension, ensuring smooth and precise synchronization between the crankshaft and camshafts.
Functions:
- Maintains proper chain tension to prevent slack or excessive tightness.
- Reduces chain noise and vibration.
- Helps keep engine timing accurate for optimal performance.
- Protects against premature wear of the chain and sprockets.
- Rattling or knocking noise from the engine, especially at startup.
- Engine light triggered due to timing issues.
- Engine misfires or rough running caused by timing irregularities.
- Excessive timing chain wear or visible slack.
- In severe cases, loss of timing leading to serious engine damage.
The chain tensioner adjuster is a critical timing component. If it fails, the timing chain can skip teeth or lose tension, resulting in poor engine performance or catastrophic internal damage.
This part is especially important during engine rebuilds, timing chain services, or if unusual noises develop from the timing system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610518059
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005

Fits:
Porsche 996 C2 / C4 1998-05
Porsche 986 Boxster 1997-04
Click picture for large parts diagram.
Diagram Ref No 7.
Please Select below
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610505
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 986 Boxster 1997-04
Porsche 996 3.4L C2 / C4 >>2001
Click 'Zoom in' for large parts diagram.
Diagram ref no 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610525301
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 986 Boxster 1997>>2004
Porsche 996 3.4L C2 / C4 >>2001
Diagram Ref No 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610525301
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
Fits:
Porsche 986 Boxster 2.5L M96.20 1996>>1999
Porsche 986 Boxster 3.2L M96.21 1999>>2002
Porsche 986 Boxster 2.7L M96.22 1999>>2002
Cars With Engine Codes:
9620 / 9621 / 9622
Porsche 996 Carrera 3.4L M96.01 1997>>1999
Porsche 996 Carrera 3.4L M96.02 1998>>1999
Porsche 996 Carrera 3.4L M96.04 1999>>2001
Cars With Engine Codes:
9601 / 9602 / 9604
Porsche 996 Carrera 3.6L M96.03 2001>>2005
Cars With Engine Codes:
9603
O-Ring Fits On To Diagram Ref No 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970164740
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 986 Boxster / S 1997-04 - x3 required
Porsche 987 Boxster / S 2005-08 - x3 required
Porsche 987 Cayman / S 2006-08 - x4 required
Porsche 996 Carrera 1998-05 - x3 required
Porsche 997-1 Carrera 2005-08 - x4 required
Diagram ref. 25.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970734440
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 986 Boxster / Boxster S 1997-04
Porsche 996 C2 / C4 >>2001
Click 'Zoom in' for large parts diagram.
Diagram ref no 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660590100
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 986 Boxster / Boxster S 1997-04
Porsche 996 C2 / C4 >>2001
Click 'Zoom in' for large parts diagram.
Diagram ref no 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660590200
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
1 per engine.
Fits:
Porsche 986 Boxster 1997-04
Porsche 987 MKI Boxster 2005-08
Porsche 987C MKI Cayman 2005-08
Porsche 996 Carrera 1998-05
Porsche 997 MKI Carrera 2005-08
Click picture for large parts diagram.
Diagram Ref No 19.
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.