Chains & Tensioners

- 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
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
2x Guides, timing chain Piece 99610517353
2x Tensioner Guide, timing chain Piece 99610517552

Fits:
Porsche 986 Boxster
Porsche 996 1998-05
Click 'Zoom in' for large parts diagram.
Diagram Ref No 33 & 30
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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
- 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 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
2 x Guides, timing chain Piece 99610517353
2 x Tensioner Guide, timing chain Piece 99610517552

Fits:
Porsche 986 Boxster
Porsche 996 1998-05
Click 'Zoom in' for large parts diagram.
Diagram Ref No 33 & 30
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Related, superseded, cross reference or alternative numbers for comparison.
99610517353KIT1
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 2.7L 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
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
ENGINEKIT14
The product you are viewing cross references to these numbers
This kit is comprised of the following items:


- 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 3.6L 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 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Carrera GT

Fits:
Porsche 996 C2 / C4 / C4S 2002>>
Porsche 986 Boxster 2.7L / 3.2L 1997-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08
Porsche 997 2005-08
Porsche Carrera Gt 2004-06
This product supersedes Porsche's old part numbers:
- 99610530302
- 99610530303
- 99610530304
- 99610530305
Click 'Zoom in' for large parts diagram.
Diagram Ref No 41
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610530307
The product you are viewing cross references to these numbers




- 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 3.6L 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 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Carrera GT
Common issues or symptoms:
Rough idle / misfires: Faulty actuator disrupts precise valve timing, leading to uneven idling or misfires
Reduced engine performance: Loss of power or hesitation at certain RPMs can be linked to improper camshaft adjustment Check Engine Light (CEL), often triggered when the engine control unit (ECU) detects misalignment or malfunction in camshaft timing — very common with actuator failure
Fits:
Porsche 996 C2 / C4 / C4S - 2002 to 2005
Porsche 986 Boxster 2.7ltr / 3.2ltr - 1997 to 2004
Porsche 987 Boxster - 2005 to 2008
Porsche 987C Cayman - 2005 to 2008
Porsche 997 - 2005 to 2008
Porsche Carrera Gt - 2004 to 2006
Faulty actuator disrupts precise valve timing, leading to uneven idling or misfires Diagnostic Trouble Codes (DTCs): Codes like P0010, P0011, P0012, P0013, P0014 often point to camshaft actuator or timing issues. They indicate conditions such as stuck timing advance/retard, or electrical faults in the actuator circuit Failure Causes: Oil contamination or sludge can clog the actuator, impairing function. Electrical problems such as wiring degradation or poor connector contact can impede correct activation
Diagnostic & repair advice check oil quality and change intervals — fresh, clean oil helps prevent buildup that hampers actuator performance scan for and interpret fault codes using an OBD-II scanner to pinpoint actuator failure or control circuit issues
Inspect connectors and wiring for corrosion or looseness
Replace defective solenoid(s) with OEM or high-quality equivalents if internal stick or mechanical failure is suspected.
This product supersedes Porsche's old part numbers:
- 99610530302
- 99610530303
- 99610530304
- 99610530305
- 99610530306
- 99610530307
Click 'Zoom in' for large parts diagram.
Diagram Ref No 41
Related reference numbers
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99610530307
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 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
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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
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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 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 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04

Fits:
Porsche 986 Boxster
Porsche 996 1998-05
Click picture for large parts diagram.
Diagram Ref No 33.




- 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
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
2 per engine. Sold each.

Fits:
Porsche 986 Boxster
Porsche 996 1998-05
Click 'Zoom in' for large parts diagram.
Diagram Ref No 33.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610517353
The product you are viewing cross references to these numbers





- 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 Boxster 986 2.7L 2001 - 2002
- Porsche Boxster 986 S 3.2 2001- 2002
Cars With Engine Codes:
M96.21 / M96.22 / M96.23 / M96.24
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
M96.25 / M96.26 / M97.20 / M97.21 / M97.22
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
M97.21 / M97.20 / M97.22
- Porsche Boxster 996 3.4L 2001
- Porsche Boxster 996 3.6L 2001- 2005
Cars With Engine Codes:
M96.01 / M96.02 / M96.03 / M96.04
- Porsche 997 Carrera 2 3.6L 2005>>
- Porsche 997 Carrera 2S 3.8L 2005>>
- Porsche 997 Carrera 4 3.6L 2005>>
- Porsche 997 Carrera 4S 3.8L 2005>>
Cars With Engine Codes:
M97.01 / M96.05
Diagram ref no 35
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610518058
The product you are viewing cross references to these numbers




- 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
The Chain Tensioner Adjuster is an essential part of your engine’s timing system. Its role is to keep the timing chain under precise tension, ensuring smooth synchronization between the crankshaft and camshafts for accurate valve timing and dependable engine performance.
Over time, chain tensioners can weaken, leading to slack, noise, and timing irregularities. Left unchecked, this can cause severe engine damage. Replacing the adjuster restores proper chain tension, reduces rattling, and helps protect your engine from costly failures.
Fits:
- Porsche Boxster 986 2.7L 2001 - 2002
- Porsche Boxster 986 S 3.2 2001- 2002
Cars With Engine Codes:
M96.21 / M96.22 / M96.23 / M96.24
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
M96.25 / M96.26 / M97.20 / M97.21 / M97.22
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
M97.21 / M97.20 / M97.22
- Porsche Boxster 996 3.4L 2001
- Porsche Boxster 996 3.6L 2001- 2005
Cars With Engine Codes:
M96.01 / M96.02 / M96.03 / M96.04
- Porsche 997 Carrera 2 3.6L 2005>>
- Porsche 997 Carrera 2S 3.8L 2005>>
- Porsche 997 Carrera 4 3.6L 2005>>
- Porsche 997 Carrera 4S 3.8L 2005>>
M97.01 / M96.05
What This Product Does:
The chain tensioner adjuster is a key component in Porsche engines with timing chains. Its job is to keep the chain at the correct tension, ensuring the crankshaft and camshafts remain perfectly synchronized.
Functions:
- Maintains proper chain tension for precise valve timing.
- Reduces slack, vibration, and chain rattle.
- Prevents chain skipping or jumping teeth under load.
- Protects the chain, guides, and sprockets from premature wear.
- Rattling or metallic noise from the timing chain area, especially at cold start.
- Engine light from timing irregularities.
- Engine misfires or rough idle due to incorrect valve timing.
- Loss of performance or efficiency.
- In severe cases timing chain failure, which can cause catastrophic engine damage.
This part is critical to engine reliability. A worn or failing chain tensioner can lead to major timing issues, risking serious internal damage.
Replacing it ensures:
- Correct tension and timing accuracy.
- Reduced noise and vibration from the chain system.
- Long-term protection of the timing chain, guides, and engine.
Diagram Ref No 35
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610518058
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 2.7L 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 65100500 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 1999-02
- Porsche Boxster S 986 3.2L 1999-02
M96.20 / M96.21 / M96.22
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
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
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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.