Chains & Tensioners

Timing Chain Guide & Tensioner Guide replacement set, consisting of:
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

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99610517353KIT

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Timing chain guide & Tensioner guide set
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

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99610517353KIT.OE

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Engine Timing Chain Kit.
Comprehensive timing chain overhaul kit for Porsche 986 Boxster 2.7L M96.23 / 3.2L M96.24 2002-2004 which includes components such as timing chain, guide rail, plus related chains, rails and hardware designed to restore your engine’s timing system.

Fits:

• Porsche Boxster 986 2.7L 2002-04
• Porsche Boxster S 986 3.2L 2002-04

Diagram Ref No 18, 19, 20, 24, 26, 28, 32, 35, 36, 37

What These Products Do:

• The timing chain system in these Porsche engines synchronises the crankshaft with the intermediate shaft and camshafts — ensuring correct valve timing, ignition timing and overall engine sequence.
• The chains carry the drive from the crank to intermediate shaft. Guides/rails support and tension the chain, ensure correct path and reduce slack or noise.
• Over time, chains stretch, guides wear or break, tensioners may lose preload — which can result in timing slack, chain rattle, mis-timing or even catastrophic engine damage in worst-case.
• A full kit ensures you replace all critical components — chain, guides, rails — so that the timing system is restored to proper specification and you eliminate weak points.

Signs & Symptoms You Should Replace:

• A rattling or clattering noise from the front engine cover especially on start-up or at idle — often the chain has slack or the guide/rail is worn.
  
• Check engine light triggered by mis-timing, camshaft sensor errors or intermediate shaft errors.
  
• Loss of power, rough running or mis-firing — if timing has shifted due to chain stretch or guide failure, valve timing may be off.
  
• High mileage / age on the engine and you plan major service – pre-emptive replacement avoids risk of failure.
  
• Visual inspection (if cover removed) shows excessive chain slack, broken plastic guide rail, broken tensioner, or damaged rail.
• During engine work (removal of front engine cover, timing cover, etc) – if the drive system is exposed you should replace the chain kit rather than just individual items.

Why Replacement Matters:

• Protects engine integrity — on these engines especially, a failed timing chain system can result in valve/piston contact or catastrophic failure.
  
• Restores correct timing — ensuring the timing chain, guides and rails are all new means valve timing and ignition timing will be accurate and reliable.
  
• Eliminates noise & improves reliability — replacing worn components removes chain slap noise and reduces risk of future damage.
  
• Cost-effective preventive maintenance — since the timing system requires major disassembly, doing the full kit while you’re already in there pays off rather than having to open the engine again later.

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ENGINEKIT986

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Timing chain set camshafts for PORSCHE 996 3.4L Carrera 986 2.5L 2.7L 3.2L 

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

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ENGINEKIT12

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Comprehensive Engine Timing Chain Kit for M96 Engines

Restore the integrity of your M96 engine’s timing system with this complete timing chain kit. Early-generation M96 engines are equipped with five timing chains—this kit replaces all chains along with the associated guides, tensioners, and hardware for a full system refresh.

Note: If the intake-to-exhaust camshaft timing chain tensioners require replacement, use part numbers 99610505158 and 99610505358.

Fits: 

• 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

What is an Engine Timing Chain?

The timing chain is a vital component in an internal combustion engine, responsible for synchronizing the rotation of the crankshaft and camshafts. This precise coordination ensures that engine valves open and close at the correct times during each cylinder’s intake and exhaust strokes, allowing for smooth performance and efficiency.

While designed to last the lifetime of the engine, timing chains can wear, stretch, or become damaged. A worn chain can alter engine timing, strain the tensioners, and, if left unaddressed, lead to catastrophic engine damage and costly repairs. 

Signs of Timing Chain Kit Failure

Noise: A failing timing chain often produces a rattling or slapping noise, particularly noticeable at startup, idle, or during acceleration.

Reduced Performance: Stretched or worn chains can disrupt engine timing, resulting in sluggish acceleration, reduced power, or poor overall performance.

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ENGINEKIT14

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Comprehensive Engine Timing Chain Kit for PORSCHE 996 3.6L M96.03 / 997 3.6L M96.05 / 997 3.8L M97.01 / Boxster / Cayman

Restore the integrity of your M96.03 / M96.05 / M97.01 engine’s timing system with this complete timing chain kit. 

Fits: 

•       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 3.6L 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

What is an Engine Timing Chain?

The timing chain is a vital component in an internal combustion engine, responsible for synchronizing the rotation of the crankshaft and camshafts. This precise coordination ensures that engine valves open and close at the correct times during each cylinder’s intake and exhaust strokes, allowing for smooth performance and efficiency.

While designed to last the lifetime of the engine, timing chains can wear, stretch, or become damaged. A worn chain can alter engine timing, strain the tensioners, and, if left unaddressed, lead to catastrophic engine damage and costly repairs. 

Signs of Timing Chain Kit Failure

Noise: A failing timing chain often produces a rattling or slapping noise, particularly noticeable at startup, idle, or during acceleration.

Reduced Performance: Stretched or worn chains can disrupt engine timing, resulting in sluggish acceleration, reduced power, or poor overall performance.

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ENGINEKIT15

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