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Old 12-12-2013, 17:35   #1
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Spade Rudder with no bearings.

Today, we dropped the rudder on our 1968 M33 SV and there was no BEARINGS. It only had two bottom plastic washers and one top plastic washer. The hole for the rudder shaft has a ss shaft from outside hull to cockpit sole. Does anyone know where I can get these spacer washers and should I be worried that there is no Bearings? Thanks
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Old 12-12-2013, 17:53   #2
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Re: Spade Rudder with no bearings.

I suspect that the washers were the bearings. If you can't find the exact replacements you should be able to have them made up from UHMWPE. I believe that is the same material most shaft bearings are made from.

Edit: here is a link to the properties.

http://www.google.ca/url?sa=t&rct=j&...57967247,d.b2I
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Old 12-12-2013, 18:03   #3
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Re: Spade Rudder with no bearings.

@ Deepfrz. I was thinking those little washers were only needed to keep the rudder and hull separated. Would these also be my bearings? I was picturing something with little balls in a machined chamber that would be inserted into the hull, Not flat plastic/nylon washers.Can I assume that this set up is good for its simplicity or did Charlie Morgan mess up. Thanks
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Old 12-12-2013, 18:49   #4
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Re: Spade Rudder with no bearings.

Pictures might help.
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Old 12-12-2013, 18:54   #5
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Re: Spade Rudder with no bearings.

Most (many?) rudder bearings are made of a high molecular weight PE. Also all (?) drive shaft bearings the same. Nylon will absorb water and can expand causing problems. UHMWPE will absorb very little water which means they can be fitted to closer tolerances.
It would be good if you posted some pictures.
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Old 12-12-2013, 19:00   #6
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Re: Spade Rudder with no bearings.

Here are some links to other threads with other recommendations.

Rudder bearing material

best material for rudder bearing

ACM Marine Bearings - L2 Marine for Rudder Applications
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Old 12-12-2013, 20:36   #7
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Re: Spade Rudder with no bearings.

I will get some pics and post. Thanks
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Old 12-12-2013, 22:03   #8
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Re: Spade Rudder with no bearings.

Quote:
Originally Posted by Autumns Wind View Post
@ Deepfrz. I was thinking those little washers were only needed to keep the rudder and hull separated. Would these also be my bearings? I was picturing something with little balls in a machined chamber that would be inserted into the hull, Not flat plastic/nylon washers.Can I assume that this set up is good for its simplicity or did Charlie Morgan mess up. Thanks
Yes, those were most likely to be "the bearings" or perhaps better termed "bushes". This is a usual arrangement with the bushes being Bronze, Delrin (acetal) or now better even better materials. Acetal looks a bit like nylon.

Works well and is simple.

Deepfrz is on the money!
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Old 14-12-2013, 12:28   #9
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Here are the pics of the bushes and rudder sleeve.

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Old 14-12-2013, 12:54   #10
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Re: Spade Rudder with no bearings.

Bushings more so than bearings with balls in races. If some crud gets in the bushing, it just gets crushed and spat out. If crud gets into a ball bearing, like sand or diatoms, it can eat them & cause problems. So lots of rudders just have bushings and your "flat" plastic washes may have been "top hat" shaped and just worn away. Or, sufficient just being flat.

If the post wiggles in the tube, a lot of folks would just shim it out by inserting a thin sheet of UHDPE or Teflon or whatever was at hand. Some folks cut up a 2-liter soda bottle, the plastic (is PET?) is actually quite durable and works as a shim in the tube.
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Old 14-12-2013, 12:58   #11
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Re: Spade Rudder with no bearings.

I guess the one on the right was at the top. Its pretty elongated. You could have one machined so that there was more bearing material inside the tube to better support the rudder shaft. Actually I would have some made for both top and bottom. The one for the top could have a larger flange so that it is supported more securely. I will see if I can draw something up in paint to explain what I mean.
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Old 14-12-2013, 13:09   #12
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Re: Spade Rudder with no bearings.

Actually hellosailor posted when I was typing so his "top hat" description pretty much fits. I'm sure you can visualize it.

Did the two from the bottom actually fit inside the tube or were they outside?
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Old 14-12-2013, 13:16   #13
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Re: Spade Rudder with no bearings.

If there's substantial wear and simply shimming doesn't seem like to will fix it, some of the Pearson owners used to clean & wax the tube and post, then pour in epoxy thickened with graphite powder. Once it sets up, it becomes a new bushing, graphite lubricated, down the entire length of the tube. You just have to make Real Damn Sure to use enough wax or release compound on the rudder post.
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Old 14-12-2013, 13:37   #14
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Re: Spade Rudder with no bearings.

And you want to make sure the rudder is perfectly aligned and centered in the tube. Not my preferred way of doing it.
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Old 14-12-2013, 14:34   #15
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Re: Spade Rudder with no bearings.

I did the epoxy graphite repair(fibreglass tube) repair on my boat two years ago and it is still nice and snug so it does work as advertised.
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