Controllable-Pitch Propeller (CPP) · Shaft Line & Propulsion
A Wärtsilä controllable‑pitch propeller (CPP) with an 8 m diameter and five blades, designed for medium‑speed diesel engines to provide variable thrust without changing shaft rotation.
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| Hub oil sampling | typically every 3-6 months, or per the maker's condition-monitoring schedule |
|---|---|
| Hub oil change | per maker's interval or on adverse sample result, commonly every 1-2 years |
| Blade seal renewal | condition-based, commonly carried out at drydock (roughly every 2.5-5 years) |
| Servo/hydraulic pump overhaul | per running-hour interval in the maker's manual, typically multi-year |
| Anode renewal | condition-based, inspected at each drydock |
| Blade bolt elongation/torque loss | renew or re-torque per the maker's limit - no universal figure across hub sizes, check this model's manual |
|---|---|
| Hub seal wear | renew on evidence of leakage or oil sample water content exceeding the maker's threshold rather than a fixed calendar figure |
| Feedback unit backlash | re-calibrate once indicated pitch deviates from actual pitch beyond the maker's tolerance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
CPP hub and blade condition is normally reviewed alongside the tailshaft/propulsion shafting survey regime; class wants hub oil sample records, evidence of seal renewal history, and blade/bolt inspection records from each drydocking. A CPP hub opening is typically expected at special survey intervals.
Estimated lifetime: Not meaningfully expressed in running hours; CPP hub mechanisms commonly remain in service 25+ years with scheduled seal renewal and periodic overhaul, typically aligned with drydocking cycles
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