Propeller System


Cutlass Bearing
Flexible Coupling
  • One might consider fitting a flexible synthetic coupling between the engine and shaft…this coupling reduces vibration and noise, and more importantly, prevents stray electrical currents in the water from causing corrosion in the engine. Most new diesels are fitted with sacrificial zincs. but it’s nice knowing you have double security.  (Upgrading the Cruising Sailboat, p. 147)
  • In most cases of shaft loss, the propeller shaft is held in its coupling with set screws that work loose. If this (common) method of attachment is used, it is essential to ensure that the set screws seat in a good-sized dimple in the propeller shaft, and that after being done up tightly, they are locked off so that they cannot possibly vibrate loose. The most effective method of locking the screws is to drill a small hole through each screwhead and then tied them together with stainless steel or Monel locking wire. However, I prefer to drill right through the coupling and shaft, and add a through-bolt held in place with a Nylok nut. This method is almost foolproof…Coupling bolts need to be locked off (with lock washers, Nylok nuts, or locking wire).  (Cruising Handbook, p. 203)
Propeller Shaft
Stuffing Box & Shaft Seal

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