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- 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
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:
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
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 / GT3 RS 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 2003-06
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 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 987 Boxster MKI 2005-08
Porsche 987 Cayman MKI 2005-08
Porsche 997 Carrera MKI 2005-08
Porsche 996 Carrera
Click 'Zoom in' for large parts diagram.
Diagram ref no 34
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610518802
The product you are viewing cross references to these numbers
- 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
Fits:
Porsche 986 Boxster 2.7L / 3.2L 2003 - 2004
with Engine codes: M96.23 / M96.24
Porsche 987 Boxster 2.7L / 3.2L / 3.4L 2005 - 2008
with Engine codes M96.25 / M96.26 / M97.20 / M97.21 / M97.22
Porsche 987C 2.7L / 3.4L Cayman 2006 - 2008
with Engine codes M97.20 / M97.21 / M97.22
Porsche 996 3.6L C2 / C4 / C4S 2002 - 2005
with Engine codes M96.03
Porsche 997.1 3.6L /3.8L 2005 - 2008
with Engine codes M96.05 / M97.01
Diagram Ref No 33.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
996105
The product you are viewing cross references to these numbers