Description
Overview:
The Oil Release Valve Spring is a small but critical component for regulating oil pressure in BSA 320CC and 420CC industrial engines. Made from robust spring steel, it provides the correct tension on the oil release (relief) valve so the lubrication system maintains stable pressure under load and temperature. This helps protect bearings and other moving parts, supporting smooth, efficient running and longer engine life. As a Genuine Villiers Part (OEM No. 86 39), it is built to the original specification for reliable fit and performance. Suitable for factory engines used in stationary equipment and industrial applications, it is ideal when refurbishing or servicing BSA 320CC or BSA 420CC units, or when symptoms point to a weak or fatigued relief spring.
Key Features:
- Genuine Villiers Part for assured compatibility with BSA 320CC and 420CC industrial engines
- OEM No. 86 39 for easy identification during service or rebuilds
- Durable spring steel construction for consistent pressure control over time
- Helps restore correct oil pressure where the original spring has weakened
- Built to the factory specification for the BSA oil release (relief) valve assembly
- Resistant to heat and oil for dependable performance in industrial duty
- Straightforward to fit during routine maintenance or an engine overhaul
- Supports engine protection by preventing over- or under-pressure conditions
- Unused vintage old stock; item may show age-related tarnish without affecting function
Typical Applications:
Used during service or rebuild of BSA 320CC and 420CC industrial engines in generators, pumps, compressors, site equipment, and agricultural or workshop machinery. Commonly fitted when addressing low or unstable oil pressure, valve leakage, or after signs of spring fatigue. Suitable as preventive maintenance to keep the lubrication system working within the intended pressure range.
Also known as:
Oil relief valve spring, oil pressure relief spring, pressure regulator spring, bypass valve spring, engine oil valve spring, lubrication system relief spring.
Fits Models:
BSA 320CC
BSA 420CC
Product Specifications
| L&S Part No. | 86 39 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Villiers |
| Unit of Sale | 1 |
| Machine Type | Engines |
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