Description
Overview:
The Centre Main Bearing Undersize 040 (part no. 570 12990/040) is a precision plain bearing for the centre main journal of selected Lister diesel engines, notably the SR2 and SR3. Made from durable, bearing‐grade metal for reliable hydrodynamic lubrication, it supports the crankshaft under continuous load and helps maintain correct oil clearance. The 0.040 in undersize (1.02 mm) specification is intended for engines with a reground crankshaft, restoring correct fit and prolonging service life. Suitable for workshop rebuilds and routine overhauls, this centre main bearing helps reduce friction, limit vibration, and protect mating components in harsh operating conditions typical of generators, pumps, compressors, and other machinery powered by Lister SR-series engines.
Key Features:
- 0.040 in undersize (1.02 mm) to suit reground crank journals for correct oil clearance
- Precision-machined bearing surfaces for consistent lubrication and smooth running
- Robust bearing-grade metal for durability under continuous load and high temperatures
- Helps reduce crankshaft and housing wear, supporting longer engine life
- Stable performance in demanding environments common to industrial and agricultural use
- Suitable for Lister SR-series centre main position for dependable support
- Straightforward to fit during overhauls using standard workshop tools and procedures
- Aids efficient oil film formation to minimise friction and heat build-up
- Reliable choice for preventative maintenance and full engine rebuilds
- Matches the requirements of engines specified for 0.040 in undersize bearings
Typical Applications:
Used during maintenance or overhaul of Lister SR-series engines driving equipment such as standby and prime-power generators, water pumps, compressors, mixers, small plant, and agricultural machinery. Ideal when a crankshaft has been reground to 0.040 in undersize (1.02 mm) and correct bearing geometry must be restored for dependable service.
Also known as:
Crankshaft main bearing, engine main bearing, centre main bush, main bearing shells, crank journal bearing, 40‐thou undersize main, 0.040 in undersize main (1.02 mm), SR series centre main bearing.
Product Specifications
| L&S Part No. | 570 12990/040 |
|---|---|
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - 0.040 in undersize for reground crank journals - Precision-machined for consistent lubrication - Durable bearing-grade metal for high temperatures - Fits Lister SR-series centre main position - Suitable for workshop rebuilds and overhauls |
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