JCB Outer Valve Spring 26.5x50mm - AZERI PARTS 02/200052
The outer valve spring by AZERI PARTS is a valve train component designed for diesel engines used in JCB machinery (including Perkins AA, AC, YA series). It is responsible for the effective and rapid closing of intake and exhaust valves, which is crucial for maintaining combustion chamber integrity, ensuring proper compression, and protecting the engine against piston-to-valve contact at high RPM.
Technical Specification:
- Dimensions: 26.5 mm (diameter) x 50 mm (free length/height).
- Type: Outer spring (main).
- Engine Compatibility: Perkins AA (Phaser/1004), AC, YA (1006).
Compatibility with JCB Machinery:
| Machine Category | Models and Series |
|---|
| Backhoe Loaders |
3CX, 4CX, 2CX, 2DX, 1400-1700, 210-217, 3D, 4CN |
| Telescopic Handlers / TM |
504-550, TM 200 (including FM and T0 versions) |
| Wheel / Skid Steer Loaders |
407, 408, 409, 410, 425, Robot 185, Robot 1105 |
| Forklifts / Dumpers |
926, 930, 940 Rough Terrain Forklifts; 712 Articulated Dumper |
Workshop Tip: Valve springs undergo natural fatigue (settling) due to thousands of duty cycles and high temperatures. It is recommended to replace the entire set of springs during every cylinder head overhaul or valve replacement. A weakened spring can lead to "valve float," resulting in power loss, increased exhaust smoke, and in extreme cases, severe piston and valve damage.
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