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Belt Tensioner Roller & Damper

The belt tensioner roller and damper is a crucial part of the auxiliary drive system on the Porsche 957 Cayenne Diesel. Working together, these components maintain correct belt tension while absorbing vibration caused by engine load changes, ensuring smooth and reliable operation of belt-driven accessories such as the alternator, power steering pump and air conditioning compressor.

Fits:

• Porsche 957 Cayenne 3.0L Diesel 2007-10

Diagram ref no 1

Given the high torque output of Porsche diesel engines, effective belt tension and vibration control are essential for durability and quiet operation.

What Do the Belt Tensioner Roller & Damper Do?

The tensioner roller guides the auxiliary belt and maintains consistent contact across pulleys, while the damper controls sudden movements and oscillations within the belt system. Together, they:

• Maintain correct belt tension under all operating conditions
• Reduce belt vibration and noise
• Protect auxiliary components from shock loads
• Ensure smooth and efficient belt tracking

This coordinated function helps extend the lifespan of the belt and surrounding components.

Why Do Belt Tensioner Rollers & Dampers Fail?

Over time, these components are exposed to constant rotation, heat cycles and environmental contamination. Common causes of failure include:

Bearing wear in the tensioner roller Loss of damping efficiency due to internal wear Heat-related material fatigue Contamination from dust, water or oil

Typical symptoms of failure include:

• Squealing or chirping noises
• Visible belt vibration
• Premature auxiliary belt wear
• Increased load on alternator and accessories

Why Replace the Belt Tensioner Roller & Damper?

Replacing worn components helps restore:

• Stable and quiet belt operation
• Correct belt alignment and tension
• Reduced stress on auxiliary drive components
• Improved overall engine refinement

Ignoring worn tensioner or damper components can lead to belt failure or damage to expensive accessories, increasing repair costs.

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Throttle Control Element for Camshaft Timing

The throttle control element for camshaft timing is a critical engine management component used in the Porsche 95B.1 Macan 2.0ltr engine. It regulates the flow of engine oil to the camshaft timing system, allowing the engine control unit to precisely adjust valve timing in response to engine load, speed and driving conditions.

Fits:

• Porsche 95B.1 Macan Petrol 2.0L 237Bhp 2014 - 01/06/2016

Diagram ref no 22

Accurate camshaft timing is essential for performance, fuel efficiency and emissions control—making this component a vital part of the Macan’s modern variable valve timing system.

What Does the Throttle Control Element Do?

The throttle control element acts as a finely controlled valve within the camshaft timing circuit. By regulating oil pressure to the camshaft adjusters, it allows the engine to:

• Optimise valve timing across the rev range
• Improve low-speed torque and high-speed power
• Enhance throttle response and drivability
• Reduce fuel consumption and emissions

This precise control ensures the engine operates efficiently and smoothly under all driving conditions.

Why Do Throttle Control Elements Fail?

Throttle control elements operate in a high-temperature environment and rely on clean, correctly pressurised engine oil. Common causes of failure include:
Oil contamination or sludge build-up

• Internal valve sticking or wear
• Electrical or solenoid malfunction
• Extended oil service intervals

Typical symptoms of failure may include:

• Engine warning lights or fault codes
• Poor throttle response Loss of power or uneven acceleration
• Rough idle or reduced fuel efficiency

Why Replace the Camshaft Timing Throttle Control Element?

Replacing a faulty throttle control element helps restore:

• Accurate camshaft timing adjustment
• Smooth power delivery
• Improved engine efficiency
• Reduced risk of further timing system damage

Continued operation with a failing control element can place excess strain on camshaft adjusters and internal engine components, leading to increased repair costs.

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Hydraulic Tappet & Inlet Cam Lever Assembly
Sold each – 8 required per car

The hydraulic tappet and cam lever assembly for the inlet valve is a precision-engineered valvetrain component used in Porsche Macan 2.0-litre engines. Working together, the hydraulic tappet and cam lever convert camshaft motion into controlled inlet valve operation while automatically maintaining correct valve clearance using engine oil pressure.

Fits:

• Porsche 95B.1 Macan Petrol 2.0L 237Bhp 2014-18
• Porsche 95B.2 Macan Petrol 2.0L 245Bhp 2019-21

Diagram ref no 7

This assembly plays a vital role in ensuring smooth engine performance, quiet operation and efficient air intake—particularly important in turbocharged Porsche petrol engines.

What Does the Hydraulic Tappet & Inlet Cam Lever Assembly Do?

The camshaft acts on the cam lever, which in turn presses against the hydraulic tappet to open the inlet valve at precisely the correct time. The hydraulic tappet uses oil pressure to compensate for thermal expansion and wear, ensuring:

• Accurate inlet valve timing and lift
• Smooth idle and throttle response
• Reduced valvetrain noise
• Consistent air intake for efficient combustion

This system allows the engine to operate efficiently across all load and speed conditions without the need for manual valve adjustment.

Why Do Hydraulic Tappet & Cam Lever Assemblies Fail?

These components operate under constant mechanical load, high temperatures and reliance on clean engine oil. Common causes of failure include:

• Oil contamination or sludge build-up
• Extended oil change intervals
• Wear to cam lever contact surfaces
• Internal tappet pressure loss
• Insufficient lubrication at cold start

Symptoms of wear or failure may include:

• Ticking or tapping noises from the cylinder head
• Rough idle or hesitation
• Reduced engine efficiency
• Accelerated camshaft or valve wear

Why Replace the Inlet Tappet & Cam Lever Assembly?

Replacing worn components helps restore:

• Quiet, refined engine operation
• Correct inlet valve timing Improved drivability and throttle response
• Protection against further valvetrain damage

Ignoring tappet or cam lever wear can lead to costly damage to the camshaft, valves or cylinder head, particularly on high-revving turbocharged engines.

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Hydraulic Tappet / Valve Lifter
Sold each

The hydraulic tappet / valve lifter is a precision valvetrain component used in Porsche Macan 2.0ltr, Cayenne S Hybrid and Panamera S Hybrid engines to automatically maintain correct valve clearance. By using engine oil pressure, the tappet ensures smooth valve actuation, quiet engine operation and consistent performance under all driving conditions.

Fits:

• Porsche 958 Cayenne S V6 3.0L Hybrid 380HP 2010-17 (inlet and exhaust)
• Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13  (inlet and exhaust)
• Porsche 970.2 Panamera S E-Hybrid V6 3.0L (416Hp) 2014-16  (inlet and exhaust)
• Porsche 95B.1 Macan Petrol 2.0L 237Bhp 2014-18 (inlet only)
• Porsche 95B.2 Macan Petrol 2.0L 245Bhp 2019-21 (inlet only)

Diagram ref no 6

In advanced Porsche petrol and hybrid powertrains, accurate valve control is essential for efficiency, refinement and long-term engine durability—making hydraulic tappets a critical service component.

What Does a Hydraulic Tappet / Valve Lifter Do?

Hydraulic tappets sit between the camshaft and the valves, using pressurised engine oil to compensate for thermal expansion and component wear. This allows the valvetrain to operate with:

• Correct valve timing and lift
• Reduced mechanical noise
• Smooth idle and throttle response
• Improved combustion efficiency

By eliminating the need for manual valve clearance adjustment, hydraulic tappets help maintain optimal engine performance throughout the engine’s service life.

Why Do Hydraulic Tappets Fail?

Hydraulic tappets operate in high-temperature, high-load environments and rely heavily on clean, correctly pressurised oil. Common causes of failure include:

• Oil contamination or sludge build-up
• Extended oil change intervals
• Internal wear of the tappet mechanism
• Loss of oil pressure retention
• Incorrect oil specification

Typical symptoms of failing tappets include:

• Ticking or tapping noises from the cylinder head
• Rough idle or hesitation
• Reduced engine efficiency
• Accelerated wear to camshafts and valves

Why Replace Worn Valve Lifters?

Replacing worn hydraulic tappets helps restore:

• Quiet, refined engine operation
• Accurate valve timing Improved drivability and efficiency
• Protection against further valvetrain damage

Ignoring tappet wear can result in costly repairs to camshafts, valves and cylinder heads—especially in hybrid engines where smooth operation is critical.

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Alternator Freewheel Clutch

The alternator freewheel clutch is a key component in the auxiliary drive system of the Porsche 971 Panamera Diesel. Designed to decouple the alternator from sudden engine speed fluctuations, it allows the alternator to freewheel when required, reducing vibration and load on the auxiliary belt system.

Fits:

• Porsche 971.1 Panamera 4S Diesel V8 4.0L 4WD (422 Hp) 2017-18
• Porsche 971.1 Panamera 4S Diesel 4.0L Twin-Turbo V8 Sport Turismo 2017-18

Pulley for diagram ref no 5

On high-torque Porsche diesel engines, the alternator freewheel clutch plays an essential role in maintaining smooth engine operation, protecting belt-driven components and ensuring reliable electrical charging.

What Does an Alternator Freewheel Clutch Do?

The alternator freewheel clutch allows the alternator rotor to rotate independently during deceleration or rapid changes in engine speed. This function:

• Reduces stress on the auxiliary drive belt
• Minimises belt vibration and noise
• Protects the alternator and tensioner
• Improves overall drivetrain refinement

By absorbing torsional oscillations, the clutch helps extend the service life of the belt system and related components.

Why Do Alternator Freewheel Clutches Fail?

Over time, freewheel clutches are exposed to heat, contamination and continuous mechanical loading. Common failure causes include:

• Internal bearing wear or seizure
• Loss of one-way clutch function
• Contamination from dust or oil
• Age-related material fatigue

Typical symptoms of failure include:

• Belt chirping or squealing noises
• Excessive belt vibration
• Premature belt or tensioner wear
• Charging system irregularities

Why Replace a Worn Alternator Freewheel Clutch?

Replacing a faulty alternator freewheel clutch helps restore:

• Smooth auxiliary belt operation
• Reduced noise and vibration
• Correct alternator charging behaviour
• Protection for belt tensioners and pulleys

Ignoring a failing clutch can lead to belt failure or damage to expensive auxiliary components, increasing repair costs.

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High Pressure Fuel Pump Tappet
Sold each - 2 required per car

The high pressure fuel pump tappet is a precision-engineered component used in the direct-injection fuel system of Porsche 976 Panamera 4.0-litre models and 9YA.2 Cayenne 4.0-litre models. Positioned between the camshaft and the high-pressure fuel pump, this tappet transfers camshaft motion to drive the pump and generate the fuel pressure required for efficient combustion.

Fits:

• Porsche 9YA.2 Cayenne S Coupe V8 4.0L 474Hp 2023>>
• Porsche 9YA.2 Cayenne Turbo E-Hybrid V8 4.0L 739Hp 2023>>
• Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe V8 4.0L 739Hp 2023>>
• Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe with GT Package V8 4.0 739Hp 2023>>
• Porsche 976 Panamera GTS V8 4.0L 2023>>
• Porsche 976 Panamera Turbo E-Hybrid V8 4.0L 2023>>
• Porsche 976 Panamera Turbo S E-Hybrid V8 4.0L 2023>>

Diagram ref no 13

In high-output Porsche V8 engines, accurate fuel pressure delivery is essential for performance, emissions control and long-term engine reliability—making this tappet a critical service part.

What Does a High Pressure Fuel Pump Tappet Do?

The tappet converts the rotating motion of the camshaft into linear movement that actuates the high-pressure fuel pump. This process allows the fuel system to:
Maintain precise high fuel pressure

• Support direct fuel injection under load
• Ensure stable engine performance across the rev range
• Optimise combustion efficiency and emissions

Without a properly functioning tappet, the fuel pump cannot operate correctly, leading to drivability and performance issues.

Why Do High Pressure Fuel Pump Tappets Fail?

Due to their location and function, fuel pump tappets are exposed to continuous mechanical contact, high loads and insufficient lubrication risk. Common causes of failure include:

• Surface wear from camshaft contact
• Breakdown of protective coatings
• Oil contamination or reduced oil flow
• Extended service intervals

Typical symptoms of tappet wear or failure include:

• Loss of engine performance
• Fuel pressure fault codes
• Rough running or hesitation
• Increased wear to the camshaft or fuel pump

Why Replace the Fuel Pump Tappet?

Replacing a worn tappet helps:

• Restore correct fuel pressure delivery
• Protect the camshaft and fuel pump from damage
• Maintain smooth, consistent engine performance
• Prevent costly fuel system or valvetrain repairs

Early replacement is particularly important on high-performance 4.0-litre Porsche engines where component wear can escalate quickly if ignored.6

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Engine Drive Belt Vibration Damper

The engine drive belt vibration dampe is a vital component in the auxiliary belt system of the Porsche 955 Cayenne S and Cayenne Turbo. Its primary role is to absorb torsional vibrations generated by the engine and rotating accessories, ensuring smooth belt operation and protecting critical components such as the alternator, power steering pump and air conditioning compressor.

Fits:

• Porsche 955 Cayenne S 4.5L V8 2003-06
• Porsche 955 Cayenne Turbo 4.5L 2003-06
• Porsche 955 Cayenne Turbo S 4.5L 2006>>  

Diagram ref no 3

Designed for high-performance V8 engines, this damper helps maintain refinement, reliability and longevity in demanding driving conditions.

What Does an Engine Drive Belt Vibration Damper Do?

As the engine runs, rotational forces and sudden load changes create vibrations within the belt drive system. The vibration damper:

• Reduces belt oscillation and resonance
• Protects auxiliary components from shock loads
• Maintains stable belt tracking and tension
• Helps prevent premature belt and pulley wear

On powerful models like the Cayenne S and Cayenne Turbo, effective vibration control is essential to ensure smooth power delivery and long-term mechanical reliability.

Why Do Vibration Dampers Fail on Porsche Cayenne Models?

Over time, vibration dampers are exposed to heat cycles, engine torque and material fatigue. Common causes of failure include:

• Degradation of the internal rubber bonding
• Cracks or separation within the damper assembly
• Age-related hardening or loss of damping ability
• Oil contamination accelerating material breakdown

Typical signs of a failing damper include:

• Belt noise or chirping
• Visible cracking or wobble
• Increased vibration from the engine bay
• Premature auxiliary belt wear

 

Why Replace the Drive Belt Vibration Damper?

Replacing a worn vibration damper helps restore:

• Smooth and stable belt operation
• Reduced stress on auxiliary components
• Correct belt alignment and longevity
• Overall engine refinement and reliability

Continuing to drive with a failing damper can lead to belt failure or damage to expensive accessories, resulting in increased repair costs.

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Diesel Engine Hydraulic Tappet / Valve Lifter
Sold each

This engine hydraulic tappet (also known as a hydraulic valve lifter) is a precision component used in Porsche diesel engines to maintain correct valve clearance automatically. By using engine oil pressure, the tappet ensures smooth valve operation, quiet running and consistent performance across all driving conditions.

Fits:

• Porsche 957 Cayenne 3.0L Diesel 2007-10
• Porsche 958 Cayenne V6 3.0L Diesel 245HP 2010-17
• Porsche 958 Cayenne S V8 4.2L Diesel 382HP 2010-17
• Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
• Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
• Porsche 971.1 Panamera 4S Diesel V8 4.0L 4WD (422 Hp) 2017-18
• Porsche 971.1 Panamera 4S Diesel 4.0L Twin-Turbo V8 Sport Turismo 2017-18
• Porsche 95B.1 Macan S Diesel 3.0L V6 258Bhp 2014-18

Diagram ref no 11

In modern Porsche diesel engines, hydraulic tappets play a crucial role in durability, refinement and emissions control—making them an essential service and repair component.

What Does an Engine Hydraulic Tappet Do?

Hydraulic tappets sit between the camshaft and valves, using oil pressure to compensate for thermal expansion and component wear. This allows the valve train to operate with:

• Correct valve timing and lift
• Reduced mechanical noise
• Improved combustion efficiency
• Lower internal engine wear

By automatically adjusting clearance, hydraulic tappets eliminate the need for manual valve adjustment and help maintain optimal engine performance throughout the rev range.

Why Do Hydraulic Tappets Fail on Porsche Diesel Engines?

Over time, hydraulic tappets are subject to heat, oil contamination and mechanical stress, particularly in high-torque diesel engines.
Common causes of failure include:

• Oil sludge or poor lubrication
• Wear to internal check valves
• Loss of hydraulic pressure retention
• Extended oil change intervals
• Contaminated or incorrect oil grades

Symptoms of worn or failing tappets may include:

Ticking or tapping noises from the cylinder head Rough idle or misfiring Reduced engine efficiency Increased valve train wear

Why Replace Worn Hydraulic Tappets?

Replacing worn hydraulic tappets restores:

• Quiet and smooth engine operation
• Correct valve timing and combustion
• Reduced wear on camshafts and valves
• Long-term engine reliability

Ignoring tappet wear can lead to accelerated damage to the camshaft and valve train, resulting in significantly higher repair costs.

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Camshaft control valve. 
Sold each.

Fits:
Porsche  95B.2  Macan  2.9L / 3.0L  2019 - 2024

Porsche  971.1 Panamera 2.9L / 3.0L 2017 - 2021
Porsche  971.1 Panamera 4.0L turbo equipment 2017 - 2021
Porsche  971.1 Panamera 4.0L GTS version 2017 - 2021
Porsche  971.2 Panamera 4.0L V8  2021 - 2024
Porsche  971.2 Panamera 2.9L V6 2021 - 2024
Porsche  976 Panamera  4.0L  V8 2024 >> (TB5)

Porsche 9YA.1 Cayenne E3 4.0L / 3.0L / 2.9L 2018 - 2024
Porsche 9YA.2 Cayenne E3 PA 3.0L / 4.0L 2024>>

Diagram ref no 8

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Roller rocker arm - used to open and close the valves. 

Sold individually; x24 required for V6 models and x32 for V8 models. 

Fits:
Porsche 95B-2 Macan S 3.0L V6 2019-21
Porsche 95B-2 Macan GTS 2.9L V6 2019-21
Porsche 95B-2 Macan Turbo 2.9L V6 2019-21

Porsche 95B-3 Macan S 2.9L V6 2022>>
Porsche 95B-3 Macan GTS 2.9L V6 2022>> 

Porsche 971-1 Panamera 3.0L V6 2017-21
Porsche 971-1 Panamera 4 3.0L V6 2017-21
Porsche 971-1 Panamera 4 E-Hybrid 2.9L V6 2017-21
Porsche 971-1 Panamera 4S 2.9L V6 2017-21
Porsche 971-1 Panamera GTS 4.0L V8 2017-21
Porsche 971-1 Panamera Turbo 4.0L V8 2017-21
Porsche 971-1 Panamera Turbo S E-Hybrid 4.0L V8 2017-21

Porsche 971-2 Panamera 2.9L V6 2021-24 
Porsche 971-2 Panamera 4 2.9L V6 2021-24
Porsche 971-2 Panamera 4S E-Hybrid 2.9L V6 2021-24
Porsche 971-2 Panamera GTS 4.0L V8 2021-24*
Porsche 971-2 Panamera Turbo S 4.0L V8 2021-24*
Porsche 971-2 Panamera Turbo S E-Hybrid 4.0L V8 2021-24*

Porsche 976 Panamera 2.9L V6 2024>> 
Porsche 976 Panamera 4 2.9L V6 2024>> 

Porsche 9YA-1 Cayenne 3.0L V6 2018-24
Porsche 9YA-1 Cayenne E-Hybrid 3.0L V6 2018-24
Porsche 9YA-1 Cayenne S 2.9L V6 2018-24
Porsche 9YA-1 Cayenne GTS 4.0L V8 2018-24*
Porsche 9YA-1 Cayenne Turbo 4.0L V8 2018-24*
Porsche 9YA-1 Cayenne Turbo S E-Hybrid 4.0L V8 2018-24*
Porsche 9YA-1 Cayenne Turbo GT 4.0L V8 2018-24*

Porsche 9YA-2 Cayenne 3.0L V6 2023>>
Porsche 9YA-2 Cayenne E-Hybrid 3.0L V6 2023>>
Porsche 9YA-2 Cayenne S E-Hybrid 3.0L V6 2023>> 

Diagram ref. 11. 

NOTE: For models marked with an asterisk (*), this part is only compatible with vehicles manufactured on or before October 25, 2022. If your vehicle was built on or after October 26, 2022, a different part number is required. 


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Hydraulic tappet / valve lifter. 

Sold individually; x24 required for V6 models and x32 for V8 models. 

Fits:
Porsche 95B-2 Macan S 3.0L V6 2019-21
Porsche 95B-2 Macan GTS 2.9L V6 2019-21
Porsche 95B-2 Macan Turbo 2.9L V6 2019-21

Porsche 95B-3 Macan S 2.9L V6 2022>>
Porsche 95B-3 Macan GTS 2.9L V6 2022>> 

Porsche 971-1 Panamera 3.0L V6 2017-21
Porsche 971-1 Panamera 4 3.0L V6 2017-21
Porsche 971-1 Panamera 4 E-Hybrid 2.9L V6 2017-21
Porsche 971-1 Panamera 4S 2.9L V6 2017-21
Porsche 971-1 Panamera GTS 4.0L V8 2017-21
Porsche 971-1 Panamera Turbo 4.0L V8 2017-21
Porsche 971-1 Panamera Turbo S E-Hybrid 4.0L V8 2017-21

Porsche 971-2 Panamera 2.9L V6 2021-24
Porsche 971-2 Panamera 4 2.9L V6 2021-24
Porsche 971-2 Panamera 4S E-Hybrid 2.9L V6 2021-24
Porsche 971-2 Panamera GTS 4.0L V8 2021-24
Porsche 971-2 Panamera Turbo S 4.0L V8 2021-24
Porsche 971-2 Panamera Turbo S E-Hybrid 4.0L V8 2021-24 

Porsche 976 Panamera 2.9L V6 2024>>
Porsche 976 Panamera 4 2.9L V6 2024>>
Porsche 976 Panamera Turbo E-Hybrid 4.0L V8 2024>> 

Porsche 9YA-1 Cayenne 3.0L V6 2018-24
Porsche 9YA-1 Cayenne E-Hybrid 3.0L V6 2018-24
Porsche 9YA-1 Cayenne S 2.9L V6 2018-24
Porsche 9YA-1 Cayenne GTS 4.0L V8 2018-24
Porsche 9YA-1 Cayenne Turbo 4.0L V8 2018-24
Porsche 9YA-1 Cayenne Turbo S E-Hybrid 4.0L V8 2018-24
Porsche 9YA-1 Cayenne Turbo GT 4.0L V8 2018-24

Porsche 9YA-2 Cayenne 3.0L V6 2023>>
Porsche 9YA-2 Cayenne E-Hybrid 3.0L V6 2023>>
Porsche 9YA-2 Cayenne S 4.0L V8 2023>>
Porsche 9YA-2 Cayenne S E-Hybrid 3.0L V6 2023>> 
Porsche 9YA-2 Cayenne GTS 4.0L V8 2023>>
Porsche 9YA-2 Cayenne Turbo E-Hybrid 4.0L V8 2023>> 
Porsche 9YA-2 Cayenne Turbo GT 4.0L V8 2023>>

Diagram ref. 13.

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