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Wärtsilä WARTSILA 645W4L20 Generator Set Marine engine Crankshaft 110-0005 110-0002F
Crankshaft, Connecting Rod, and Piston Assembly BOM
110-0005 (Qty: 1) - Crankshaft: One-piece forged crankshaft; OEM standard part with high-frequency induction hardening.
110-0003B (Qty: 1 set) - Vibration Damper: Silicone-filled torsional vibration damper; installed at the free end to prevent crankshaft fracture due to torsional vibration.
113-0001 (Qty: 4 sets) - Piston Assembly: Composite piston with steel crown and aluminum skirt (includes piston pin and snap rings).
113-002A (Qty: 4 sets) - Piston Ring Set: 3 rings per cylinder (barrel-faced compression ring, keystone compression ring, and oil control ring).
114-0005 (Qty: 4 pairs) - Connecting Rod Bearing Shell: Core bearing shell designed to withstand intense combustion pressures.
114-0010 (Qty: 8) - Connecting Rod Bolt: Mandatory replacement item during major overhauls; reuse is strictly prohibited.
Engine Block and Main Bearing Assembly BOM
100-0001 (Qty: 5 pairs) - Main Bearing Shell: Core tri-metal bearing shell supporting the crankshaft; 5 main bearing positions per engine.
100-0002 (Qty: 1 pair) - Thrust Bearing Pad: Controls crankshaft axial movement (end play).
100-0021A (Qty: 4 units) - Cylinder Liner: 200mm bore; includes top anti-polishing ring.
100-0035 (Qty: 4 sets) - Cylinder Liner O-ring Set: Includes high/low-temperature water seals (Viton material).
107-0057A (Qty: 8 units) - Crankcase Side Cover Gasket.
645W4L20 Generator Set Marine engine Mechanical & Engine Structure
| Parameter | Specification / Data | Remarks |
|---|---|---|
| Engine Platform | Wärtsilä 20 series | 4-stroke, direct injection, turbocharged with intercooler |
| Configuration | 4-cylinder in-line (4L20) | The most compact cylinder configuration in the W20 series |
| Bore | 200 mm | Internal diameter of the cylinder |
| Stroke | 280 mm | Distance between top and bottom dead center |
| Displacement per Cylinder | 8.8 L | Total displacement for 4 cylinders is approx. 35.2 Liters |
| Valves per Cylinder | 4 | 2 inlet valves, 2 exhaust valves |
| Mean Piston Speed | Approx. 8.4 m/s | At the rated speed of 900 RPM |
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