Description
Overview:
The Valve Spring (Inner) to suit Petter PAZ1 Diesel Engine is a genuine Lister Petter component that maintains positive valve closure and consistent timing under engine load. Made from high‐tensile spring steel with a dark, corrosion‐resistant finish, it is designed to handle repeated compression cycles and elevated operating temperatures. This inner spring is sized at approximately 40 mm height with 20 mm width and 20 mm depth, suitable for the compact PAZ1 valvetrain layout and the ZPB 56 variant. It is ideal for diesel stationary engines used in generators, pumps and small plant. Supplied as unused old stock, it may show light tarnishing or cosmetic age‐related marks that do not affect performance. A straightforward replacement during valve service or engine rebuilds.
Key Features:
- Genuine Lister Petter inner valve spring for accurate fit and performance on PAZ1/ZPB 56 engines
- High‐tensile spring steel construction resists fatigue, set and heat for long service life
- Dimensions: approx. 40 mm height, 20 mm width, 20 mm depth for correct seating and clearance
- Ensures reliable valve return and sealing to help maintain compression and smooth running
- Suitable for routine maintenance, decoke/valve service and full restorations of vintage units
- Unused old stock; cosmetic tarnish or minor storage marks may be present only on the surface
- Direct replacement for worn or weakened inner springs to restore factory valve spring rate
- Genuine part traceability helps match OEM specifications and avoids compatibility issues
Typical Applications:
Used during PAZ1 engine repairs and rebuilds, including head overhauls, valve lapping, and timing checks. Common on stationary generators, water pumps, compressors, and small construction or garden machinery powered by Petter PAZ1. Suitable as a preventative replacement when addressing valve float, misfire, or loss of compression.
Also known as:
Valve return spring (inner), engine valve inner spring, inner valve return spring, valvetrain inner spring, PAZ1 inner spring, ZPB56 inner valve spring.
Fits Models:
PAZ1, ZPB 56, ZPB56
Alternate Part Numbers:
ZPB-56, ZPB56
Product Specifications
| L&S Part No. | ZPB 56 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Lister Petter |
| OEM No. | ZPB 56 |
| Unit of Sale | 1 |
| Size | Overall Height: 40mm Overall Width: 20mm Overall Depth: 20mm |
| Machine Type | Engines |
| Fits Brands | Lister Petter |
| Key Features | - Genuine Lister Petter part for PAZ1/ZPB 56 engines - High-tensile spring steel resists fatigue and heat - Dimensions: 40 mm height, 20 mm width, depth - Ensures reliable valve return and sealing - Suitable for routine maintenance and restorations |
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