Description
Overview:
Main Bearings Undersize 020 for Lister HB4/6 and HA4/6 engines are precision bearing shells used to support the crankshaft and maintain correct oil film clearance after a crank regrind. This genuine Lister Petter set replaces worn mains to restore smooth, reliable running and correct oil pressure. Supplied as a matched pair (upper and lower shells), the bearings are engineered to factory tolerances for consistent fit and alignment. The 0.020" undersize (approx. 0.51 mm) suits crankshafts that have been ground to that dimension. Manufactured from high‐quality bearing materials with a durable bearing surface, they are suitable for heavy-duty use in industrial and agricultural Lister diesel engines. New Old Stock (NOS) for authenticity under original specification. Part number: 352 12671/020.
Key Features:
- Genuine Lister Petter main bearing set for assured compatibility and performance
- Undersize 0.020" (approx. 0.51 mm) for reground crankshafts
- Supplied as 2 shells (upper and lower), matched as a pair for one main journal
- Precision-engineered to OEM tolerances for correct oil clearance and stable oil film
- High-quality bearing surface for durability under continuous load
- Helps restore oil pressure, reduce vibration, and minimise wear on the crankshaft
- Suitable for heavy-duty service in plant, generators, pumps, and industrial engines
- New Old Stock (NOS) for authentic, original-spec replacement
- Easy to fit during rebuilds; professional measurement and cleanliness recommended
- Part number stamped for identification and future service reference
Typical Applications:
Used during engine overhauls or repairs where the crankshaft has been reground to 0.020" (0.51 mm) undersize. Common in Lister-powered generators, compressors, pumps, construction plant, and agricultural machinery to restore reliable operation, maintain oil pressure, and extend engine life.
Also known as:
Main bearing shells, crankshaft main bearings, 0.020" undersize mains (0.51 mm), undersize bearing set, main journal bearings, engine bearing set.
Fits Models:
HA, HA4/6, HA46, HB, HB4/6, HB46, HS6, HW4/6, HW46
Alternate Part Numbers:
35212671020
Product Specifications
| L&S Part No. | 352 12671/020 |
|---|---|
| Part Type | Genuine Part |
| Machine Type | Engines |
| Key Features | - Genuine Lister Petter main bearing set for HA4/6, HB4/6 engines - 0.020" undersize for reground crankshafts - Supplied as matched upper and lower shell pair - Precision-engineered to OEM tolerances for correct oil clearance - High-quality bearing surface for heavy-duty use |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
