Underwater Gear Projects & Solutions Part Two

A series of FREE Mini Guides for boating projects that run through the basic steps for the practical boat owner. This Mini Guide concentrates on what to look for when inspecting, repairing or renewing the Underwater Gear including the propeller shaft, rudder and anode condition.


Propeller Shafts

Check the propeller shaft is running true when the boat is out of the water. A simple visual check for signs of wear, particularly near the P-bracket where a ‘ring’ of wear can appear and any bend, which can be caused by hitting the bottom, can help to highlight any bad oscillation.

Freeman Propeller Shafts
from £525.00


Rudder stocks can split at the fork where the blade joins and should be examined. Sometimes the rivets loosen and the blades need to be tightened.

If there appears to be more serious damage or electrolysis has set in then a new rudder is usually the only option. Look for signs of ‘pinkness’ and pitting in the blade close to the stock.

Look for bent blades, electrolysis around the stock (if metals have been mixed) and snapped rudder stocks.

Freeman Rudders
from £485.00


Check the bolts are holding firm and that there is no sign that the P-bracket has been knocked and bent at all.

A more regular maintenance check and replacement of the cutlass bearing is by far the most common problem with P-bracket enquires.



If you have a mix of metals underwater then a right anode helps guard against electrolysis. Replace anodes if eroded or damaged. Remember not to antifoul over anodes as this will prevent them working as they should.

Underwater Gear Accessories

Additional underwater gear equipment & accessories.

Copyright © Sheridan Marine 2015. All rights reserved. E&OE. This is a project guidance sheet and not a ‘How-to’ fact book. It is presumed that all work is carried out safely following the product manufacturers instructions. Each project may differ so may need further discussions and guidance. Disable the engine so that there is no chance it starts while you work on the gear.