[Public-List] Stiff Main Sheave

[John Birch]

Mornin Don,

On some of the earlier boats they used Tufnell - I use a bit of Davis Teflon 
grease on the shaft, but Danny Klacko put an SS bearing into our alu sheave 
to avoid the alu SS contact at the turning point. Works well, but that was 
all part of Sunstone's mast retro fit project back in 97

Are you in yet ?

Best

John

----- Original Message ----- 
From: "Don Campbell" <dk.campbell at sympatico.ca>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Saturday, May 14, 2011 8:07 AM
Subject: Re: [Public-List] Stiff Main Sheave


> Hi Brennan:
>     It is probably not rust but the oxidation that occurs between steel 
> and aluminum. I think the sheave is aluminum and from the two masts I have 
> here, the bolts are stainless steel. If there is ever any salt that does 
> get up to that sheave, then the oxidation is more rampant. It is a major 
> problem on our highway trucks here in the winter when they use steel 
> rivets on aluminum frames.
>     There are two bolts up at the masthead that hold the rigging on the 
> mast. The one holds jumper straps and the other holds the uppers. There is 
> a bushing for the sheave on the second bolt but the top one is only 3/8" I 
> would take the stick down for safety and it will give you a chance to do a 
> thorough inspection of all that is on the mast, lights antennae etc. at 
> the same time.
>     I do not know of any product that will give you a good barrier to the 
> steel/aluminum contact on that sheave, but suspect that it has not been 
> down for a clean for  a few years.
> Don #528
>
> On 5/13/2011 4:45 PM, Brennan Carney wrote:
>> It looks like my main sheave has some rust on it which is keeping it from
>> turing as smoothly as it should. Can anyone say if it will be safe to go 
>> up
>> the mast and repair this? The problem is that the uppers are connected to
>> the same bolt that the sheave is on so we would have to disconnect them.
>> Lowers, fore and back stays will be unaffected.
>>
>> Thanks,
>>
>> BTC
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