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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- 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)
Rocker Arm Adjustment Screw
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The Porsche Rocker Arm Adjustment Screw is a
vital valve train component used on Porsche 911 and Porsche 964 models from
1965 to 1994. This precision-engineered adjuster screw allows accurate setting
of valve clearances, ensuring the correct relationship between the rocker arm
and valve stem for smooth engine operation and optimal performance.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- 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
Diagram ref no 32
In Porsche's iconic air-cooled flat-six engines, valve clearance adjustment is a critical maintenance procedure. The rocker arm adjustment screw enables technicians to set valve lash precisely, helping maintain correct valve timing, efficient combustion, reduced valve train wear, and long-term engine reliability.
Whether you are carrying out a routine valve adjustment, rebuilding a cylinder head, or restoring a classic Porsche engine, replacing worn adjustment screws helps ensure accurate valve settings and dependable valve train operation.
What Does the Rocker Arm Adjustment Screw Do?
The rocker arm adjustment screw is used to establish and maintain the correct valve clearance between the rocker arm and the valve stem.
Its primary functions include:
- Allowing precise valve clearance adjustment
- Maintaining correct valve lash specifications
- Supporting accurate valve timing
- Reducing excessive valve train wear
- Ensuring smooth engine operation
- Helping maximise engine performance and efficiency
Correct valve clearance is essential on air-cooled Porsche engines, as thermal expansion during operation can significantly affect valve train geometry.
Why Does the Rocker Arm Adjustment Screw Fail?
Over time, the adjustment screw is subjected to constant mechanical loading, heat cycles, vibration, and repeated adjustment procedures.
Common causes of failure include:
- Wear on the adjustment tip
- Surface pitting or scoring
- Metal fatigue Excessive valve train loads
- Poor lubrication conditions
- Incorrect valve adjustment procedures
- Corrosion during long-term storage
- Damage caused during engine rebuilds or maintenance
As wear develops on the adjustment surface, maintaining accurate valve clearances becomes increasingly difficult.
Common Symptoms of a Worn Adjustment Screw
A worn or damaged rocker arm adjustment screw may cause:
- Excessive valve train noise
- Difficulty achieving correct valve clearance
- Frequent valve adjustment requirements
- Inconsistent valve lash measurements
- Reduced engine performance
- Increased wear on valve stems
- Rough running or poor idle quality
- Premature wear of related rocker arm components
In severe cases, excessive wear can affect valve timing accuracy and contribute to accelerated engine wear.
When Should You Replace It?
Replacement is recommended whenever wear is identified during inspection or engine servicing.
The adjustment screw should be replaced:
- During valve adjustment procedures if wear is found
- During cylinder head rebuilds
- During complete engine rebuilds
- When valve train components are being renewed
- If the adjustment tip is pitted or damaged
- When accurate valve clearance cannot be maintained
- During preventative restoration work
- On high-mileage engines showing valve train wear
Many Porsche engine specialists replace adjustment screws during major engine work to ensure consistent valve train geometry and long-term reliability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110537002
The product you are viewing cross references to these numbers
- 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 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
The OE Match Rocker Arm is a premium-quality replacement valvetrain component designed to transmit camshaft movement to the engine valves on compatible Porsche engines. Manufactured to OE specifications for fit, strength and precision, this rocker arm ensures accurate valve operation, maintaining correct valve timing, engine efficiency and reliable performance throughout the engine's operating range.
Sold Each.
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 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Diagram Ref No 12
Manufactured from high-strength, heat-treated steel with precision-machined contact surfaces, the rocker arm is engineered to withstand constant reciprocating movement, high engine speeds and extreme operating temperatures. Designed for direct OE-style installation, it provides precise alignment with the camshaft and valve train components, making it ideal for engine rebuilds, cylinder head repairs and preventative maintenance.
What This Product Does:
- Transfers camshaft movement to the engine valves.
- Controls the opening and closing of the intake or exhaust valves.
- Maintains accurate valve timing and lift.
- Supports efficient combustion and engine performance.
- Reduces friction within the valvetrain assembly.
- Ensures smooth and reliable valve operation.
- Restores factory valvetrain performance.
- Forms an essential part of the engine valve train assembly.
Symptoms Of Wear Or Failure:
- Ticking or tapping noises from the top of the engine.
- Engine misfires.
- Reduced engine performance.
- Rough idle.
- Loss of power during acceleration.
- Excessive valvetrain wear.
- Uneven valve operation.
- Increased engine vibration.
- Metal particles found during engine servicing.
- Engine fault codes relating to valve timing or cylinder performance.
Why Replacement Matters:
- The rocker arm is subjected to continuous high-speed movement, heavy contact loads and constant lubrication cycles every time the engine operates. Over time, the contact surfaces, pivot points or roller mechanism (where applicable) can wear, reducing the precision of valve operation and increasing stress on the camshaft and valves.
- A worn or damaged rocker arm can prevent the valves from opening and closing correctly, leading to reduced engine performance, poor fuel economy, rough running and accelerated wear of other valvetrain components. If left unresolved, severe wear can result in valve train failure and costly engine repairs.
- Replacing a worn rocker arm restores accurate valve operation and ensures the engine continues to deliver smooth, efficient performance. The OE Match Rocker Arm is manufactured to OE standards using premium-quality materials, providing factory-style fitment, exceptional durability and long-lasting reliability, making it the ideal choice for Porsche engine repairs, rebuilds and preventative maintenance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510541720
The product you are viewing cross references to these numbers
- 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 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Price is for each.
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2009-10
Porsche 958 Cayenne 3.0L DIESEL 2011>>
Porsche 958 Cayenne 4.2L V8 DIESEL 2013>>
Porsche Macan 3.0L V6 TDI 2014>>
Porsche 970 Panamera 3.0L DIESEL 2012>>
Click 'Zoom in' for large parts diagram.
Diagram Ref No 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510541720
The product you are viewing cross references to these numbers
- 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
Diesel Engine Hydraulic Tappet / Valve Lifter
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:
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 wearWhy 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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958109521
The product you are viewing cross references to these numbers