Axle Genuine Porsche part 90110534700

Code: 90110534700

Genuine Porsche part

Axle

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Related products

Rocker arm screw. Porsche 911 1965-89 / 964 / 914

90110537002/1

Product Information

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

12213

90110537002

901.105.370.02

12213

911031-01

The product you are viewing cross references to these numbers