Main Engine 4-Stroke · Main Engines (4-Stroke)
The 7H21/32 is a 7‑cylinder inline medium‑speed diesel main engine delivering up to 1 540 kW (≈2 070 hp) at 720–1000 rpm, featuring common‑rail fuel injection and Tier II/III emissions compliance.
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| oil_change | 400-600 hours |
|---|---|
| fuel_filter_change | 200-400 hours |
| air_filter_change | 100-200 hours |
| coolant_change | 2000-4000 hours |
| piston_ring_gap | 0.5-1.5 mm |
|---|---|
| cylinder_liner_wear | 0.5-1.0 mm |
| valve_clearance | 0.2-0.5 mm |
| crankshaft_bearing_clearance | 0.01-0.05 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically check for compliance with Tier II and Tier III emissions regulations, as well as inspecting critical components such as piston cooling nozzles, fuel injectors, and exhaust valves for condition and wear
Estimated lifetime: 20000-30000 hours
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