This valve spring is a replacement component for the valve train in Yanmar single-cylinder diesel engines, including the L48E and L48N5SJ1. Made from high‐grade, heat‐treated spring steel, it provides the controlled tension needed to open and close the valves reliably across the engine’s operating range. By maintaining correct valve timing and seating, it helps protect compression, power output, and starting performance. Built to meet OEM standards for fit and function, it is designed for the L48E cylinder head and is suitable where the original spring has become worn, fatigued, or damaged. Typical uses include compact construction and garden machinery powered by Yanmar L‐series engines. Brand: Yanmar. Manufacturer Part Number (MPN): 114299-11120.

Key Features:
– Manufactured from durable, heat‐treated spring steel for long service life
– Meets OEM specifications for reliable valve control and seating
– Direct replacement for the original spring on L48E cylinder heads
– Helps restore smooth running, compression, and power when the old spring is fatigued
– Stable performance under high engine temperatures and repeated cycling
– Consistent spring rate to support correct valve timing across the rev range
– Suitable for professional service or DIY maintenance with standard tools
– Compatible with selected Yanmar L‐series engines used in compact equipment

Typical Applications:
Used during engine overhauls or repairs on Yanmar L‐series diesel engines to replace weakened valve springs. Common on small industrial and site machinery such as compactors, cement mixers, pumps, generators, and garden machinery, where consistent valve operation is essential for starting, torque, and emissions control.

Also known as:
Valve return spring, engine valve spring, cylinder head spring, valve coil spring, head valve spring, cam valve spring.

Fits Models:
L40AE, L48AE, L48E, L48N, L48N-S, L48N5SJ1, L48NS

Alternate Part Numbers:
114299-11120, 11429911120

Product Specifications