Primary Timing Chain/Balance Shaft Drive. Porsche 957/958 Cayenne 3.0L V6 Diesel 2007-2011  ❭  958109229A

Primary Timing Chain/Balance Shaft Drive.
The IWIS Primary Timing Chain / Balance Shaft Drive is a replacement internal engine drive-chain component for compatible Porsche applications. It forms part of the engine's timing and balance-shaft drive system, transmitting rotational movement between key internal components to maintain the required mechanical relationship during engine operation.

Fits:

• Porsche 957 Cayenne 3.0L Diesel 2007-10
• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2011

Diagram Ref No 1

Timing and balance-shaft drive components operate continuously whenever the engine is running. Wear, elongation or damage to the chain can introduce excessive slack, noise and inaccurate drive operation. If deterioration becomes severe, there is a risk of the chain jumping or failing, potentially resulting in significant internal engine damage.  

What This Product Does:

The primary drive chain transfers rotational movement through the engine's internal drive system.

Depending on the specific engine configuration, it forms part of the mechanical drive arrangement responsible for maintaining the required relationship between the crankshaft, timing system and balance-shaft assembly.

Its functions help support:

• Accurate mechanical drive within the timing system
• Correct synchronisation of associated engine components
• Reliable balance-shaft operation
• Smooth engine operation
• Controlled transfer of rotational movement
• Consistent timing-system performance
• Reduced unwanted engine vibration through correct balance-shaft operation

The chain must remain correctly tensioned and properly engaged with its associated sprockets throughout engine operation.

Symptoms Of Wear Or Failure:
Timing and balance-shaft chains are designed for extended service life, but wear can develop through mileage, inadequate lubrication, contamination or deterioration of associated tensioners, guides and sprockets.

Possible symptoms include:

• Rattling from the timing-chain area
• Metallic clattering or chain noise
• Excessive chain slack
• Chain elongation
• Abnormal noise during cold start
• Noise that changes with engine speed
• Increased engine vibration
• Rough or less refined engine operation
• Timing-related fault codes
• Crankshaft/camshaft correlation faults where relevant
• Balance-shaft related faults where monitored
• Visible wear on the chain during inspection
• Worn or damaged chain guides
• Abnormal sprocket wear
• Metal or plastic debris in the engine oil or filter

These symptoms can also be caused by other timing-system or internal engine components, so accurate diagnosis is important.

Why Replacement Matters:
The primary timing and balance-shaft drive chain is an important internal engine component.

Replacing a confirmed worn, elongated or damaged IWIS Primary Timing Chain / Balance Shaft Drive can help:

• Restore reliable chain-drive operation
• Maintain correct mechanical synchronisation
• Reduce excessive chain slack
• Reduce abnormal timing-chain noise
• Restore reliable balance-shaft drive
• Help maintain smooth engine operation
• Protect associated guides and sprockets
• Reduce the risk of the chain jumping
• Reduce the risk of major timing-system failure
• Protect expensive internal engine components

A worn chain should not be ignored once it has exceeded the permitted service specification.

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

958109229A

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