Description
Overview:
The Crankshaft Key to Hold Flywheel on JAP 4/3 Petrol Engine is a small but vital drive component used to lock the flywheel to the crankshaft, preventing slip and maintaining correct timing. Manufactured from durable, precision-machined steel, it is built to withstand repeated service and the torsional loads seen in starting and running. This Genuine Villiers part is engineered for a precise fit in JAP 3 and JAP 4 petrol engines, helping restore or maintain reliable operation in legacy plant, agricultural, and garden machinery powered by these units. By securing the flywheel in the keyway, it keeps ignition timing stable and ensures consistent engagement between the crankshaft and flywheel for smooth running and dependable performance during maintenance or full rebuilds.
Key Features:
- Genuine Villiers part for assured compatibility with JAP 3 and JAP 4 engines
- Precision fit in the crankshaft/flywheel keyway to prevent slippage under load
- Robust steel construction for long service life and repeatable reliability
- Helps maintain correct ignition timing and smooth engine operation
- Suitable for routine servicing, repairs, and full engine restorations
- Compact, simple component that is easy to handle and fit with basic tools
- Supports safe reassembly of the flywheel after points, magneto, or crank work
- Resists fretting and wear when correctly installed in a clean keyway
- Cost-effective fix for flywheel movement or timing drift issues
- Trusted choice for heritage engines used in construction and garden equipment
Typical Applications:
Used when fitting or refitting the flywheel on JAP 3 and JAP 4 petrol engines during servicing, ignition timing checks, crankshaft work, or full overhauls. Common on vintage machinery such as compactors, generators, pumps, rotavators, and mixers powered by JAP engines where a secure crank-to-flywheel connection is essential.
Also known as:
Engine key, flywheel key, shaft key, crankshaft locating key, keyway key, drive key, flywheel retaining key.
Fits Models:
JAP 3, JAP 4
Product Specifications
| L&S Part No. | 18431 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Villiers |
| OEM No. | 18431 |
| Unit of Sale | 1 |
| Applications | JAP 3, JAP 4, JAP3, JAP4 |
| Machine Type | Engines |
| Fits Brands | JAP |
| Fits Models | JAP 4, 3 |
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