Description
Overview:
This flywheel/crankshaft nut is a genuine Villiers part for various JAP stationary engines, supplied as unused vintage stock. It secures the flywheel to the crankshaft, maintaining correct clamping force for smooth, reliable operation. Made from robust metal with a hexagonal profile, it suits restoration and routine maintenance on classic JAP engines such as the JAP 3 and JAP 4. The nut carries Manufacturer Part Number 16684 and features an inner diameter of 16.64 mm and an outer diameter of 32.76 mm. It is a practical replacement where the original nut is worn, damaged, rounded, or missing, helping to keep heritage engines in service across older machinery in workshops, on-site, and in the garden. Genuine Part.
Key Features:
- Genuine Villiers/JAP component (MPN 16684) for period-correct fit and function
- Unused old stock; may show age-related tarnish or storage marks only
- Durable metal construction for consistent clamping and long service life
- Hex profile for use with standard spanners, aiding straightforward fitting and removal
- Helps prevent flywheel movement and timing drift by maintaining a secure joint
- Inner diameter 16.64 mm; outer diameter 32.76 mm for accurate sizing checks
- Direct replacement for tired or rounded fasteners during rebuilds or servicing
- Suitable for multiple JAP engines, supporting parts commonality across ranges
- Useful when refitting after ignition, magneto, or crank seal work
- Supports reliable running and reduces the risk of vibration-related loosening
Typical Applications:
Used when refitting or replacing the flywheel retaining nut on vintage JAP engines during maintenance, rebuilds, and restorations. Common during ignition timing work, magneto service, crankshaft seal replacement, or after flywheel removal for cleaning. Suitable for classic machinery powered by JAP engines in workshops, heritage equipment, and outdoor power applications.
Also known as:
Flywheel retaining nut, crank nut, crankshaft securing nut, flywheel fixing nut, JAP fastener, Villiers JAP nut, engine flywheel nut, crank end nut, vintage engine fastener.
Fits Models:
JAP 3, JAP 4, JAP 5, JAP 6
Alternate Part Numbers:
16684
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