Rudder Stock dropped

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Pengze
Mechanic
Posts: 60
Joined: Tue Sep 23, 2008 8:57 pm

Rudder Stock dropped

Postby Pengze » Sun Sep 07, 2014 8:27 pm

Dear Sirs,
Would appreciate to advise what are the probable causes that could affect the Rudder Stock to drop down a few centimetres from its original position ?
The Rudder is of the semi-balance type.
The ship had been operating for about 3 years.
Hereby extend my thanks for yr kind response.

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Big Pete
Engineering Mentor
Posts: 785
Joined: Fri Apr 24, 2009 11:18 pm
Currently located: Solihull, England

Re: Rudder Stock dropped

Postby Big Pete » Sun Sep 07, 2014 11:40 pm

I heard of one case with a new Japanese built car carrier, where the rudder and stock dropped and it was found that the ship had been built without a Pallister bearing!! Nothing to support the weight of the rudder at all.

Generally check out the condition of the Rudder bearings and the ship's framework below the Rudder.

Good Luck and let us know what you found.

Big Pete
It is always better to ask a stupid question than to do a stupid thing.

Pengze
Mechanic
Posts: 60
Joined: Tue Sep 23, 2008 8:57 pm

Re: Rudder Stock dropped

Postby Pengze » Mon Sep 08, 2014 7:23 pm

Dear Sir,
1.We are currently using the cylindrical roller bearing (23052 CC/W33) for the rudder carrier, any different with Pallister bearing ?
2.Would appreciate yr elaborate clarification about the framework below the Rudder ?
3.Our current jumping collar clearance is abt 10mm, is it okay ?

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JK
Enduring Contributor
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Joined: Tue Sep 04, 2007 2:29 am
Currently located: East Coast, Canada

Re: Rudder Stock dropped

Postby JK » Tue Sep 09, 2014 3:00 am

Consult your blueprints. All of the information is in there, or should be.


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