Rocker Arm Shaft Nut. Porsche 911 / 912 / 964 1965-94  ❭  90110537603

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.

Related reference numbers
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90110537603

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