Hydraulic valve tappet, Exhaust. Porsche 986 / 987 Boxster / 996 / 997.1 / 987C Cayman / 955 Cayenne  ›  99610504172

Rocker Arm - Sold Each
Not to be used with Performance Camshafts

The Porsche Rocker Arm is a critical valve train component fitted to numerous Porsche 911 and Porsche 964 models produced between 1965 and 1994. As a key link between the camshaft and the engine valves, the rocker arm converts camshaft movement into precise valve operation, ensuring accurate opening and closing of the intake and exhaust valves throughout the engine's operating range.

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 31

Porsche's air-cooled flat-six engines rely on precise valve train geometry to deliver their renowned performance, reliability, and responsiveness. A correctly functioning rocker arm helps maintain valve timing accuracy, efficient combustion, smooth engine operation, and long-term durability.

Whether you are rebuilding a classic Porsche engine, refurbishing cylinder heads, or restoring a high-mileage 911 or 964, replacing worn rocker arms is an important step in maintaining valve train performance and engine reliability.

What Does the Rocker Arm Do?

The rocker arm transfers movement from the camshaft to the engine valves.

Its primary functions include:

• Opening intake and exhaust valves at the correct time
• Maintaining accurate valve lift
• Supporting proper valve timing
• Transferring camshaft motion efficiently
• Helping ensure optimal combustion efficiency
• Maintaining smooth engine performance throughout the rev range

Because the rocker arm operates continuously whenever the engine is running, it is one of the most heavily loaded components within the valve train.

Why Does the Rocker Arm Fail?

Over time, rocker arms are subjected to constant mechanical stress, friction, heat, and vibration. This can lead to wear and deterioration, particularly in higher-mileage engines.

Common causes of rocker arm failure include:

• Wear on the rocker arm contact surfaces
• Excessive valve train loads
• Poor lubrication
• Contaminated engine oil
• High engine mileage
• Incorrect valve adjustments
• Excessive camshaft wear
• Metal fatigue from repeated operation

As wear develops, the rocker arm may lose its ability to maintain precise valve control, affecting engine performance and increasing wear on related components.

Common Symptoms of a Worn Rocker Arm

A failing rocker arm can cause:

• Excessive valve train noise
• Ticking or tapping sounds from the cylinder heads
• Reduced engine performance
• Rough idle Increased valve clearance variation
• Premature valve train wear
• Misfires or inconsistent combustion
• Difficulty maintaining correct valve adjustments

If left unaddressed, worn rocker arms can accelerate wear to camshafts, valves, and adjustment hardware.

When Should You Replace It?

Rocker arms should be carefully inspected whenever cylinder heads or valve train components are serviced.

Replacement is recommended:

• During complete engine rebuilds
• During cylinder head refurbishment
• If excessive wear is found on contact surfaces
• When valve train noise persists after adjustment
• If rocker arm bushings show wear
• During high-mileage restorations
• When replacing worn camshafts
• As preventative maintenance during major engine work

Many Porsche engine builders replace worn rocker arms as part of a complete valve train refresh to restore factory performance and reliability.

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

93010504306

The product you are viewing cross references to these numbers

Rocker Arm Adjustment Screw 
Sold each

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

Rocker Shaft.

The OE Match Rocker Shaft is a premium-quality replacement valvetrain component designed to provide a precision mounting and pivot point for the engine's rocker arm assembly on compatible Porsche engines. Manufactured to OE specifications for fit, hardness and durability, the rocker shaft ensures smooth rocker arm movement, accurate valve operation and reliable engine 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
• Porsche 914 (1970-1976)  

Diagram Ref No 7

Manufactured from high-strength, precision-machined hardened steel, the rocker shaft is engineered to withstand constant mechanical loading, high engine temperatures and continuous lubrication. Its precision-ground surface minimises friction and wear between the shaft and rocker arm, ensuring accurate valve actuation throughout the engine's operating range. Designed for direct OE-style fitment, it is ideal for engine rebuilds, maintenance or replacing worn original components.  

What This Product Does:

• Provides the pivot point for the rocker arm assembly.
• Supports accurate opening and closing of the engine valves.
• Maintains correct valvetrain geometry.
• Reduces friction between the rocker arm and shaft.
• Ensures smooth and consistent valve operation.
• Helps maintain precise valve timing and engine performance.
• Supports long-term durability of the valvetrain.
• Forms an essential part of the engine's valve train assembly.

Symptoms Of Wear Or Failure:

• Tapping or ticking noises from the cylinder head.
• Excessive rocker arm play.
• Accelerated rocker arm wear.
• Uneven valve operation.
• Reduced engine performance.
• Rough idle.
• Increased valvetrain noise during acceleration.
• Visible scoring or wear on the shaft surface.
• Engine oil leaks around the rocker shaft area where applicable.
• Premature wear of associated valvetrain components.

Why Replacement Matters:

• The rocker shaft is subjected to continuous contact with the rocker arms while operating under high engine loads, elevated temperatures and constant lubrication. Over time, the shaft surface can wear, become scored or develop excessive clearance, affecting the accuracy of valve movement and increasing valvetrain noise.
• A worn rocker shaft can accelerate wear of the rocker arms and valve train components, resulting in reduced engine efficiency, increased mechanical noise and compromised valve timing. If left unattended, excessive wear may lead to more extensive engine repairs during future maintenance or rebuilds.
• Replacing a worn rocker shaft restores precise rocker arm operation, correct valve geometry and smooth engine performance. The OE Match replacement provides factory-style fitment, precision-machined hardened steel construction and exceptional durability, helping maintain reliable valve operation, engine efficiency and the long-term performance expected from your Porsche.

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

90110534205

The product you are viewing cross references to these numbers