These Big End Shells (Standard) are genuine JAP replacement bearings for JAP 4F petrol engines and compatible JAP 4 variants. Supplied to OEM specification (No. 18476), they are metal-backed shells with an anti-friction bearing surface designed to support the crankpin at the connecting rod. By restoring correct oil clearance at the big-end, they reduce friction, heat, and wear, helping the engine run smoothly and quietly. Standard-size shells are intended for crankshafts at standard diameter, making them suitable for routine rebuilds where the journal has not been reground. Built for reliability and long service life, they are a practical choice for maintaining or refurbishing vintage and small plant engines powered by JAP 4 or JAP 4F units. Genuine JAP part for assured fit and performance.

Key Features:
– Genuine JAP part for correct fit and quality assurance (OEM No. 18476)
– Standard-size specification for crankpins at standard diameter
– Durable metal-backed construction with anti-friction bearing surface
– Helps restore oil pressure, reduce knock, and improve smooth running
– Precision finish to support consistent oil film and minimise wear
– Protects crankshaft journals and connecting rods under load
– Reliable performance when installed with correct clearances and lubrication
– Suitable for routine servicing and full engine overhauls
– Designed for JAP 4F and compatible JAP 4 petrol engine applications
– Made to support efficiency and longevity in older small engines

Typical Applications:
Used during engine rebuilds or repairs of JAP 4F and JAP 4 petrol engines found in small plant, stationary engines, pumps, generators, mixers, compactors, and grounds-care machinery. Ideal for replacing worn big-end bearings to restore smooth operation, reduce friction, and extend engine life.

Also known as:
Big-end bearings, con-rod bearings, connecting rod shells, crankpin shells, crankshaft big-end bearings, engine bearing shells, rod bearing shells.

Fits Models:
JAP 4, JAP 4F, JAP4, JAP4F

Product Specifications