Internal valve spring – Hahn & Sohn HDE20SS3-DW

This engine uses dual valve springs (outer and inner), which is a common design solution in higher-performance engines — the combination of two concentric springs with different stiffness and diameters ensures more stable valve operation at high engine speeds and a more even distribution of force than a single large spring. The inner spring has a smaller diameter and is positioned concentrically inside the outer spring.

• The part is designed for the four-cylinder diesel engine WEICHAI WP2.3D25E200 (Hahn & Sohn HDE20SS3-DW generator, 20 kW / 25 kVA).

WHY CUSTOMERS CHOOSE IT

• Exact match for the WEICHAI WP2.3D25E200 engine
• Essential part for a complete valve train overhaul

PRACTICAL TIP

Always replace the inner and outer spring together as a pair at the given position, even if one of them appears visually undamaged — they are designed to work together with the specific combination of stiffness of both springs simultaneously.

KEY FEATURES

• Type: inner valve spring (part of a dual spring assembly)
• Material: steel (spring steel)
• Designed for engine: WEICHAI WP2.3D25E200
• Compatible generator: Hahn & Sohn HDE20SS3-DW (20 kW / 25 kVA)

USE / INSTALLATION / OPERATION

1. Remove the cylinder head and valve train according to the service procedure.
2. Using a suitable spring compressor, compress the springs, release the retaining clip, and remove the retainer, outer spring, and inner spring.
3. Before installing the new spring, visually check that it is not deformed, cracked, or corroded.
4. Install the inner spring, then position the outer spring concentrically around it, fit the retainer, and secure it with the retaining clip.

Installation requires a valve spring compressor and experience with valve train servicing.