Camshaft nut. Porsche 911 / 912 / 930 / 914 › 90110517200

The OE Match camshaft nut is a retaining fastener for the camshaft drive assembly on the Porsche applications listed below. It is relevant to timing-system repairs and engine rebuilding where the existing nut is damaged or unsuitable for refitting.

Fits:

• Porsche 914 (1970–1976)
• 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 1975–1977 3.0L Turbo (930)
• Porsche 911 1978–1989 3.3L Turbo (930)
• Porsche 911 1978–1983 3.0L / SC

Diagram Ref No 41

The 1978–1983 valve-control applications specify this nut only up to 1981. For the left-hand valve-control assembly on 1965–1969 911 models, the engine-number restriction is M 090 7001 >>. Check the fitted camshaft and retaining arrangement, particularly where an engine has been rebuilt or modified.

Check fitment for your specific vehicle (model, year, engine) before ordering.

Required Quantity
Sold individually; 2 required per car for the applicable nut-retained arrangement.

What Is This Part?
This is the threaded retaining nut used in the camshaft drive assembly. The matched 911 applications place it within the left- and right-hand valve-control assemblies, alongside the timing-chain drive components. Its role is to secure the assembled camshaft drive components once their position has been correctly established. During dismantling, the nut and the mating camshaft thread should be inspected together rather than assessing the fastener in isolation.

What Does This Part Do?

• Retains the drive assembly: Provides the threaded fastening used to hold the camshaft drive components in their assembled position.
• Maintains secure seating: Allows the retained components to be secured when fitted and tightened using the correct engine-specific procedure.
• Supports timing-system reassembly: Forms part of the fastening arrangement checked during camshaft and valve-control work.

Why Replace This Part?
Replacement is appropriate if inspection finds damaged threads, distorted tool-engagement surfaces, cracking or deterioration that prevents the nut from seating correctly. Damage caused by unsuitable tools or previous incorrect tightening can also make a fastener unsuitable for reuse.

When the timing assembly is dismantled, inspect the mating thread and the retained components as well. A new nut will not correct damage elsewhere in the assembly. Removal alone does not establish that this nut must be replaced; follow the workshop instructions for the particular engine and retaining arrangement.

When to Replace This Part?

• Thread damage: Renew the nut if its threads are stripped, crossed or visibly deformed.
• Tool damage: Replace it if damaged engagement surfaces prevent the correct tool from fitting securely.
• Cracking or distortion: Do not refit a nut with visible structural damage.
• Poor seating: Investigate a nut that will not seat correctly, checking the mating thread and adjacent components before reassembly.
• Evidence of loosening: Have the complete retaining arrangement inspected rather than assuming the nut is the only cause.

Where Is This Part Fitted?
Location: At the camshaft drive retaining position within the valve-control assembly. The matched 911 applications include both left- and right-hand assemblies; access and installation procedures depend on the engine fitted.

FAQs

• Must this nut be replaced whenever it is removed? Follow the engine-specific workshop instructions. Replace a damaged or unsuitable nut, but do not assume it is single-use without confirmation.
• What else should be checked during fitting? Inspect the mating camshaft thread, seating surfaces and associated retaining components. Verify valve timing as required by the workshop procedure before returning the engine to service.

Product Summary

• Product: Camshaft retaining nut.
• Brand: OE Match.
• Part reference: 90110517200.
• Purpose: Retains components within the camshaft drive assembly.
• Quantity supplied: One nut.