Centaur rudder removal

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UserError
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Centaur rudder removal

Post by UserError » Sun May 27, 2018 12:15 pm

Hello,
I'm on the club slipway, now on a falling tide, having researched the process of removing the rudder but it won't budge despite judicious hammering with a block

I've removed the through-bolt & the collar/indicator turns freely.
Is there anything else? I saw mention of a Woodruff key, but can't see one. I presume I don't need to remove the stainless (bearing housing?).
Is the black plastic ring I can see a seal, or the top of the top bearing? I've gently prised it and it doesn't seem to want to come up.
Many thanks.
Jonathan
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Centaur Polly B
Littlehampton

UserError
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Re: Centaur rudder removal

Post by UserError » Thu May 31, 2018 11:40 am

I have just been advised by a number of Westerly owners elsewhere, that the black ring is the top flange of the bushing and that the rudder is now released to drop.
And that seriously heavy hammering is required. Club hammer inadequate, sledge hammer needed.
Centaur Polly B
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TyroSailor
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Re: Centaur rudder removal

Post by TyroSailor » Thu May 31, 2018 6:15 pm

I read somewhere recently that one should always use the smallest hammer that will do the job. It hurts less when you miss.
Experience: That which would have been most useful five minutes before you acquired it.

Steve
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UserError
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Re: Centaur rudder removal

Post by UserError » Tue Jun 05, 2018 8:23 am

That's probably good advice. Using a club hammer shifted it just enough to not be able to get the pin back in. I did go gently with the sledgehammer, not overhead swings...
We've now got it so that the machined square section is about to go into the bearing. Hitting took us so far, but the tube I was using to go over the round bit was starting to deform the square bit. Whether it helped, I don't know, but I anointed the shaft/bearing crevice with liquid soap and PTFE spray.

I then put the tiller on and stood on the pivot end whilst my daughter pushed it back & forth until the tiller head started resting on the travel stops.

I semi entered the water while she stood on the shaft and pushed the rudder to & fro whilst sitting on the edge of the Avon/hanging from the boat. I need someone heavier as she's only a slip of a girl.

I was wondering about undoing the top bearing housing and pulling the top bearing off to halve(ish) the friction.
Would I regret this? (I think I might). What holds the nuts underneath? - access doesn't appear to have been uppermost in the designers mind.
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Only 6 hours work...
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UserError
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Re: Centaur rudder removal

Post by UserError » Thu Jun 07, 2018 12:49 pm

I put a ratchet straps round the rudder & tied it to the boat.

Hitting it is only a solution if it moves. It will mushroom any part and what I didn't want to happen was the main shaft to increase in diameter at the top.

With mucho time in the water, eventually got it out. Various members of my family stood on the rudder shaft while I pushed the rudder from side to side sitting partially on the edge of the Avon.
Maybe took another 8 hours to get it to drop!

Bottom bearing drifted out textbook, using a piece of broom handle.

The top one wasn't interested. Using a technique from youtube involving two mole grips- plus my addition of a large adjustable spanner to exert twist, it gradually came out.

I think the cause of stiffness could be this rubbery stuff. The shaft is clean, the bushes aren't too bad. Very odd. Would explain why the stiffness didn't ease up.
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Re: Centaur rudder removal

Post by UserError » Sat Jun 16, 2018 10:58 pm

The new bushes from Trafalgar were nearly 2mm od oversize. Caroline (of Trafalgar) stated that they were machined to the original Westerly spec and that they shouldn't take much hitting to insert That may be the case, but I have no reason to doubt my rudder tube isn't original and lots of people report having to reduce the diameter. It took me many hours to reduce them - the local engineer had knocked off for the weekend so I had to come up with a solution. Sanding just took too long & I deduced that a rasp or surform was needed.

I mounted the bush in my drill, using a length of threaded stud and sockets to accommodate the internal diameter etc. It didn't centre perfectly, but wasn't too bad and I variously held the drill against the rasp/surform, grated off little by little until it was a hand fit.
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Blue bag collected all the dwarf, but then blew away into the river...
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Centaur Polly B
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