removing propeller from shaft

In shipyard practice the ship is moved by tugs from repair berth to the dry dock and engine is not used. Hub and shaft evaluation and preparation. The crack locations and their grooves are mapped and recorded in the survey report for future reference. (Fig: Sterntube shaft and oil seal) There is no need for an alignment check , since the coupling bolts go at the same locations (the bolts are correspondingly numbered and marked on holes as well as bolts.) (It is harder to reinstall the hub properly if the redrive is not removed.) Remove the propeller nut by turning it counterclockwise with an adjustable wrench. Marine Uniforms for MCA-UK & Rest of the world, Withdrawal of Propeller  shaft, survey and assembly, propeller shaft Withdrawal,survey assembly, Verification of tightness of nut on shaft, Assembly of propeller shaft and propeller, Sea water cooled/lubricated stern tube and shaft:-, Development of the Keyless propeller shaft, Renewal of propeller shaft using Spare propeller shaft, WHAT IS DRY DOCK? Thousands of photo’s, illustrations and pages of text to help the L322 owner tackle any problem. For boat yards, the Cadillac of propeller removal tools relies on the power of hydraulics. Pull out constant velocity joint (1), up to limit position. Readings taken at at least at six locations , readings taken in directions P-S and T-B. We can utilize two different methods of pulling the seals. It all depends on how stuck it is. (6) Chrome liners forward and aft flange connections uncoupled and chrome liners pushed in (7) A light mark(line) made on taper of shaft in line with forward edge of the boss made. When this happens, you have to cut off the impeller and chip all of the plastic away from the brass nut before you can remove the nut with a wrench. This problem came to light only when powers started increasing. In the case of the propeller shaft ,for withdrawal purpose in dry dock the same procedure was used. They are the shift shaft, the driveshaft, and the prop shaft. Undo and remove all clamping bolts between the flange and shaft. Remove coupling from shaft. Today my boat was lifted out, so the first job I like to do is remove the prop, inspect it and give it a good clean. The shaft is pushed in carefully to prevent the edges of the taper surface from damaging the white metal surface. This flange must remain on the propeller shaft. For a push up load of 700 tons the normal reaction on the taper face is 700*14* 9.81=96138 KN. Loosen the guides in the flanges of the propeller shaft by means of a cylindrical punch (R = 10 - 12 mm, length = about 150 mm). (3) Propeller cone dismantled , propeller nut key dismantled and propeller nut taken out (Fig: Propeller nut locking device), (4) Propeller blades position adjusted and weight of propeller supported by slings and chain blocks which are suspended from bridles(harness) properly rigged from poop bollards. (11) Lower propeller down to rest and keep it properly supported. Remove prop. This is an approximate and average estimate. The shaft torque formula is given by T/J =ft /R , Where T is the torque transmitted and resisted J is the polar second moment of area of cross section of shaft. The flange provides a stop located a short distance from the propeller hub thereby limiting movement of the propeller down the tapered shaft at the instant it is broken free. Hence this job can be commenced and completed before ship enters the dry dock. Most of these ships had conventional shafting systems , sea water lubricated. This job has to be done at a repair yard on the repair berth or at any port or repair berth.

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