Description
Overview:
The Piston Ring Set (020) is a genuine Lister Petter replacement for AB1 and AC1 industrial engines. It restores correct sealing between the piston and cylinder, helping to maintain compression, control oil consumption, and transfer heat away from the piston crown. Manufactured from durable ferrous ring-grade material with precision-ground faces, the set is built for reliability in demanding duty cycles. The (020) size denotes an oversize of +0.020 in (+0.51 mm), suitable for engines that have been re-bored to the corresponding dimension. This is the "latest type" for these engines and carries OEM reference 391821 (020) for accurate identification. Supplied as unused old stock, it may show minor cosmetic tarnish expected of vintage parts. Genuine Lister Petter part for dependable fit and function.
Key Features:
- Genuine Lister Petter component for assured compatibility and quality
- OEM reference: 391821 (020) for precise identification
- Oversize specification: +0.020 in (+0.51 mm) for re-bored cylinders
- Robust ring-grade ferrous construction for wear resistance and long service life
- Precision-ground faces support excellent compression and controlled oil consumption
- Stable performance in industrial applications and continuous-duty operation
- Designed to fit the AB1, AC1, and ACZ1S engine family
- Straightforward installation using standard ring-compression tools
- Ideal for engine overhauls to recover power, starting, and fuel efficiency
- Unused old stock; may show light tarnish with no effect on performance
Typical Applications:
Used during engine rebuilds or top-end overhauls of Petter AB1, AC1, and ACZ1S units found in site generators, water pumps, air compressors, light construction plant, and agricultural machinery. Suitable for restoring compression after re-boring the cylinder to +0.020 in (+0.51 mm), improving starting, idle stability, and overall engine efficiency in daily-use or standby equipment.
Also known as:
Ring pack for Petter AB/AC engines, compression and oil-control ring kit, engine rebuild ring kit 0.020 in oversize (0.51 mm), AB1/AC1 oversize rings, industrial engine ring set.
Fits Models:
AB1
AC1
ACZ1S
Product Specifications
| L&S Part No. | 391821 (020) |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Lister Petter |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - Genuine Lister Petter part for AB1, AC1, ACZ1S engines - Oversize +0.020 in (+0.51 mm) for re-bored cylinders - Precision-ground faces for optimal compression - Durable ferrous material for long service life - OEM reference 391821 (020) for accurate identification |
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