Description
Overview:
The Crankshaft Main Bearing Gear End (U/S040) GS1851SA is a genuine Lister Petter bearing shell designed for the gear-end main journal on Petter AA and AB diesel engines. Built as a steel-backed shell with an anti-friction lining, it supports the crankshaft under heavy load while maintaining stable oil film and smooth rotation. Marked U/S040, it is intended for a reground crank journal 0.040 in undersize (approximately 1.02 mm), ensuring correct oil clearance when used with a properly machined crankshaft. OEM reference AAC32/040 confirms dimensional accuracy and direct replacement fitment. Supplied as unused old stock, it may show light tarnish or storage marks that do not affect service performance. Suitable for workshop rebuilds and preventative maintenance on classic Petter industrial engines.
Key Features:
- Genuine Lister Petter part for assured compatibility and build quality (OEM AAC32/040)
- U/S040 sizing: 0.040 in undersize (approx. 1.02 mm) for reground crank journals
- Steel-backed, anti-friction bearing shell for dependable load carrying and long service life
- Precision-machined geometry to help maintain correct oil clearance and stable lubrication
- Gear-end position bearing to control crank alignment under drive-load side stresses
- Direct replacement fit; no modification when used with the correct undersize journal
- Durable construction suitable for diesel duty cycles and continuous operation
- Supplied as unused vintage stock; cosmetic ageing only, not affecting function
- Helps reduce noise, vibration, and wear by supporting the crankshaft accurately
- Suitable for professional engine rebuilders and competent DIY maintenance
Typical Applications:
Used during engine overhauls, crankshaft regrinds, and scheduled renewals on Petter diesel engines powering generators, water pumps, compressors, small plant, and agricultural machinery. Ideal where the gear-end main journal has been machined 0.040 in (1.02 mm) undersize and requires a matched bearing shell to restore correct operating clearance and reliable oil film support.
Also known as:
Main bearing shell (gear end), main journal shell U/S 40 thou (1.02 mm), engine main bush (gear-end), gear-end main shell, 40 thou undersize main, AAC32/040 gear-end shell.
Fits Models:
AA, AB, AC
Product Specifications
| L&S Part No. | AAC32/040 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Lister Petter |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - Genuine Lister Petter part for AA and AB engines - U/S040 sizing for 0.040 in undersize journals - Steel-backed with anti-friction lining - Precision-machined for correct oil clearance - Direct replacement fit for reground crankshafts |
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