Crankshaft bearing (lower) – Hahn & Sohn HDE20SS3-DW

The lower main bearing shell is installed in the bearing cap (unlike the upper shell, which sits directly in the engine block) and together with the upper shell forms a complete circular bearing surface for the crankshaft journal. Unlike the upper half, it does not have an oil hole — oil is supplied to the bearing through an oil passage from the upper side, while the lower shell primarily serves to distribute the load evenly and maintain the lubricating film.

• The part is designed for the four-cylinder diesel engine WEICHAI WP2.3D25E200 (Hahn & Sohn HDE20SS3-DW generator, 20 kW / 25 kVA) and, like the upper shell, features a locating tab, which ensures precise positioning in the bearing cap and prevents rotation.
• When replacing the main bearings, the lower and upper shells are always replaced together as a pair — never individually.

WHY CUSTOMERS CHOOSE IT

• Exact match for the WEICHAI WP2.3D25E200 engine
• Matching part for the upper shell — together they form a complete pair for one main bearing
• Essential part for a complete engine overhaul

PRACTICAL TIP

Always replace the upper and lower shells together as a pair, even if the wear is uneven — combining an old and a new shell in one bearing results in uneven oil clearance and faster wear of the new part.

KEY FEATURES

• Type: lower crankshaft main bearing shell
• Design: multi-layer construction (steel backing + bearing alloy)
• Without oil hole (unlike the upper shell)
• Locating tab to prevent rotation
• Designed for engine: WEICHAI WP2.3D25E200
• Compatible generator: Hahn & Sohn HDE20SS3-DW (20 kW / 25 kVA)

USE / INSTALLATION / OPERATION

1. The removal/installation procedure is identical to that for the upper shell (see previous part) — the lower shell is installed in the bearing cap.
2. The locating tab must engage in the groove in the cap.
3. Reinstall the cap with the new shell and tighten it to the specified torque.
4. After installation, check that the crankshaft rotates freely before refilling the oil and starting the engine.

Installation requires experience with combustion engine servicing — we do not recommend replacing the part yourself without specialist knowledge.