Rocker Arms & Tappets

Rocker arm screw.



Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 914-6 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref No 32.

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90110537002

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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

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Rocker arm shaft bushing.



Fits:
Porsche 911/912 1965-89
Porsche 964 1989-94

Click 'Zoom in' for large parts diagram.
Diagram ref no 26

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90110534403

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Rocker arm shaft bushing. 
This rocker arm bush is an replacement bushing that supports the rocker arm/rocker shaft interface in the cylinder head. Manufactured to OE-style dimensions, it restores correct rocker shaft support, helps reduce valvetrain noise, and promotes smooth, consistent valve operation - ideal for top-end servicing or engine rebuilds.
Sold each, 12 required per vehicle.

Fits:
Porsche 911/912 1965 - 1989
Porsche 964 1989 - 1994

Diagram ref no 26

Worn or loose rocker arm bushings allow excessive shaft play, leading to noisy valve trains, inaccurate lift, premature shaft wear, and eventual valve timing issues. Replacing them with OE Match bushings during engine overhaul or top-end servicing restores proper geometry and prolongs the life of the valvetrain.

When to replace:
•  Crankshaft or valve train noise
•  Excessive lateral shaft movement
•  High-mile engine rebuild
•  During rocker shaft removal/service
•  Preventive maintenance

Related reference numbers
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90110534403

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Rocker arm shaft nut.



Fits:
Porsche 911/912 - 1965 to 1989
Porsche 964 - 1989 to 1994

Click 'Zoom in' for large parts diagram.
Diagram ref no 28

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90110537603

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Rocker Arm Shaft Nut.

Genuine Porsche Rocker Arm Shaft Nut retains rocker arm shaft securely to the cylinder head for precise valve timing.
Sold Each.
x12 Required.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1970-1973 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 914 (1970-1976)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93

Diagram Ref No 47

What This Product Does:

The rocker arm shaft is the pivot point upon which the rocker arms rotate, translating camshaft lobes into valve movement. The nut’s job is to clamp that shaft in position so the valvetrain geometry remains correct and the rocker arms maintain alignment under load.

Signs / Symptoms That It Needs Replacement:

• Excessive valvetrain noise (ticking, knocking) because the rocker shaft is not held firmly
  
• Irregular valve motion — valves might not open or close properly
• Misalignment of rocker arms
• In severe cases, mechanical damage to the rocker arms, shafts, or even the camshaft or head if components shift under load

Why Replacement Matters:

• Ensures correct torque and shaft alignment in the rocker arm assembly.
• Prevents vibration, noise, and wear caused by loose or aged hardware.
  
• Critical during rebuilds — reused nuts can lose clamping force or thread accuracy.

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90110537603

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Rocker arm shaft seal. O-ring designed to stop oil leaks from the rocker shafts.
24 required. Priced each.

Fits:
Porsche 911 1965-89
Porsche 930 Turbo 1974-89
Porsche 914-6 1970-72
Porsche 964 C2 / C4 1989-1994
Porsche 964 Carrera RS 3.6L 1992
Porsche 964 Turbo 3.6L 1993-94

Fits to number 25 on diagram.

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91109910352

The product you are viewing cross references to these numbers

Rocker arm shaft seal. O-ring designed to stop oil leaks from the rocker shafts.
24 required. Priced each.

Fits:
Porsche 911 1965-89
Porsche 930 Turbo 1974-89
Porsche 914-6 1970-72
Porsche 964 C2 / C4 1989-1994
Porsche 964 Carrera RS 3.6L 1992
Porsche 964 Turbo 3.6L 1993-94

Fits to number 25 on diagram.

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91109910352

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Rocker arm.



Fits:
Porsche 356B, Super, Super 90, C, SC
Porsche 912 1965-69

Click 'Zoom in' for large parts diagram.
Diagram ref no 14.

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61610503701

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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
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93010504306

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Rocker Arm.

This item is now an Exchange part and no longer available as new from Porsche. Surcharge applies.

Fits:
Porsche 911 1965-89
Porsche 964 1989-94

Worn rocker arms retard cam timing and rob power. these are the latest heavy duty 930 rockers for optimum reliability.

Diagram Ref No 31

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930105043EX

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Rocker shaft. Porsche 911 1965-89 / 964 / 914
Note: Please do not exceed factory torque spec of 18Nm

Fits:
Porsche 911 1965-89
Porsche 930 (911) 1975-89
Porsche 964 1989-94
Porsche 965 (964) Turbo 1989-94
Porsche 914-6 1970-76

Diagram Ref No 27

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90110534205

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Rocker shaft. Porsche 911 1965-89 / 964 / 914
Note: Please do not exceed factory torque spec
Porsche 911 1965-89 18Nm
Porsche 914 1970-76 18Nm
Porsche 964 1989-94 20Nm

Fits:
Porsche 911 1965-89
Porsche 930 (911) 1975-89
Porsche 964 1989-94
Porsche 965 (964) Turbo 1989-94
Porsche 914-6 1970-76

Diagram Ref No 27

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90110534205

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Rocker Shaft.



This is a new rocker shaft that is Hard Chromed then precision ground for an extended service life.
This short rocker shaft is sold per each, for an engine you need four.

Fits:
Porsche 912
Porsche 356 B/C

Click 'Zoom in' for large parts diagram.
Diagram ref no 13

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61610532500

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Spacer for rocker arm. 0,60 mm.
Sold each.



Fits:
Porsche 356 all models
Porsche 912 1965-69

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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53905237

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Spacer for rocker shaft



Fits:
Porsche 356 B (1960 - 1963)
Porsche 356 C (1963 - 1965)
Porsche 911 F (1965 - 1969)

Click 'Zoom in' for large parts diagram.
Diagram ref no 19

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61610531200

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