Description
Overview:
These Big End Shells in standard size are genuine JAP components for restoring the big-end bearing surfaces in JAP 3 and JAP 4 industrial petrol engines. Each precision-machined shell sits in the connecting rod and cap to support the crankpin, maintaining the correct oil film and clearance for smooth, reliable running. Built with a robust steel backing and an anti-friction bearing layer, they are made to handle continuous service typical of small plant and machinery. Supplied to the original specification, they are intended for use on standard (un-reground) crankpins and are identified by OEM reference 18474 STD. Choosing genuine parts helps ensure proper fit, consistent tolerances, and long service life in demanding workshop or site conditions.
Key Features:
- Genuine JAP part for assured compatibility and build quality
- Standard size (STD) for un-reground crankpins on JAP 3/4 engines
- Precision tolerances to restore correct oil clearance and bearing geometry
- Steel-backed construction with an anti-friction running surface for durability
- Helps reduce knock, vibration, and premature wear in the rod and crankshaft
- Supports stable oil film for reliable lubrication under load
- Suitable for engine rebuilds, overhauls, and preventative maintenance
- OEM reference: 18474 STD for straightforward identification
- Designed for straightforward fitting when following the correct torque and cleanliness procedures
Typical Applications:
Used during servicing or rebuilds of JAP 3 and JAP 4 engines found on compactors, cement mixers, generators, pumps, rollers, and other small site and garden machinery. Ideal for replacing worn big-end bearings to restore smooth running, reduce friction and heat, and extend engine life in equipment that operates for long periods or under frequent start-stop cycles.
Also known as:
Big-end bearings, con-rod shells, rod journal shells, crankpin shells, big-end inserts, rod bearings, and shell bearings. These terms refer to the semi-circular bearing liners fitted to the connecting rod big end that support the crankpin and maintain correct running clearance.
Fits Models:
JAP 3, JAP 4, JAP3, JAP4
Alternate Part Numbers:
S8730M, S8730S
Product Specifications
| L&S Part No. | 18474 STD |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | JAP |
| OEM No. | 18474 STD |
| Unit of Sale | 1 |
| Applications | JAP 3, JAP 4, JAP3, JAP4 |
| Machine Type | Engines |
| Fits Brands | JAP |
| Fits Models | JAP 4, 3 |
