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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 914 (1970-1976)
This locking nut is critical in maintaining the correct clearance setting between the rocker-arm or cam follower and valve stem, ensuring reliable valvetrain performance and correct engine behavior.
SET OF 12
Fits:
Porsche 911 1973 - 1989
Porsche 911 Turbo 1975 - 1989
Porsche 964 C2 / C4 / RS 1989 - 1994
Porsche 964 Turbo 1991 - 1994
Porsche 914 1970 - 1976
Porsche 914/6 1970 - 1972
Diagram ref no 50
• Position on Vehicle: Engine cylinder head, at the valve adjusting screw area - used to lock the adjuster once clearance is set.
• Function: Locks the valve-adjusting screw in place, ensures the correct clearance remains unchanged under engine operation, prevents loosening of adjuster and ensures valvetrain reliability.
• Specification: M8 × 1 thread, correct height and socket size, treated or coated for durability - direct-fit replacement of Porsche part number 99903400500.
• Applications: Ideal when your original nut is damaged, the adjuster is loose, you are doing a valve-clearance service, or you require reliable hardware for engine rebuilds.
While small, this locking nut performs a vital role: without it, the adjuster can drift, valve clearance can open up or close down, leading to noisy operation, performance loss, premature wear or even engine damage. Symptoms of a failing/incorrect nut include adjusting screw backing out, noisy valvetrain, incorrect clearance and poor idle or performance.
When to replace:
• The adjuster locking nut is missing, corroded, rounded or damaged.
• After valve-clearance adjustment and you want guaranteed lock-in of the setting.
• During engine rebuild or cylinder-head service when valvetrain hardware is exposed.
• To replace the original with fresh hardware to maintain service integrity and reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903400500
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 9YA Cayenne Turbo V8 4.0L Petrol (550Hp) 2020-23
- Porsche 9YA Cayenne Coupe Turbo V8 4.0L Petrol (550Hp) 2019-23
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 971.1 Panamera Turbo V8 4.0L 4WD (550 Hp) 2017-20
- Porsche 971.1 Panamera Turbo V8 4.0L 4WD Executive 2017-20
- Porsche 971.2 Panamera Turbo S 4.0L V8 2021-23
- Porsche 971.2 Panamera Turbo S Sport Turismo 4.0L V8 2021-23
- Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
Fits:
Porsche 95B.1 Macan 2.0ltr - 2014 to 2018
Porsche 95B.1 Macan S 3.0lr - 2014 to 2018
Porsche 95B.1 Macan GTS 3.0ltr - 2014 to 2018
Porsche 95B.1 Macan turbo 3.6ltr - 2014 to 2018
Porsche 95B.2 Macan 2.0ltr - 2019 to 2021
Porsche 970 Panamera Hybrid 3.0ltr - 2009 to 2016
Porsche 971 Panamera turbo 4.0ltr - 2017 to 2023
Porsche 958 Cayenne Hybrid - 2010 to 2017
Porsche 9YA Cayenne turbo 4.0ltr - 2018 to 2023
Click 'Zoom in' for large parts diagram.
Diagram ref no 4
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A710931100
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
- Porsche 970.2 Panamera S E-Hybrid V6 3.0L (416Hp) 2014-16
- Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
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:
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810542320
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
- Porsche 970.2 Panamera S E-Hybrid V6 3.0L (416Hp) 2014-16
- Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
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:
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810542320
The product you are viewing cross references to these numbers
- Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
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:
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810941710
The product you are viewing cross references to these numbers