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The Prop That Fits Any Gearbox — Here’s How | S2 Ep.74
October 12, 2025 · 27 min · 6K views
What this video covers
Installing a J-PROP propeller on a new gearbox requires replacing the internal spline insert to match the specific shaft dimensions of the new transmission.▶ 0:18 The J-PROP design features a modular three-part body and a sacrificial rubber-ring anti-shock system, which protects the gearbox and damper plate from damage if the propeller strikes an object.▶ 6:20 During installation, the technician must use a specific spacer ring—distinct from the original ZF spacer—to ensure the propeller sits correctly on the shaft without contacting the sail drive leg.▶ 10:39 The process involves greasing all components with a Teflon-based polymer grease, such as the 4002 formula, and aligning the spline insert with the shaft before securing the assembly with a central extractor nut and a conical safety locking bolt.▶ 16:27 While the propeller includes an optional pitch-locking ring for high-horsepower engines, it is unnecessary for the 59-horsepower Nanni N4.65 engine used on this vessel.▶ 21:11 Regular factory servicing allows for the remachining of propeller components to maintain tight tolerances and eliminate vibration over decades of use.▶ 1:20
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