Removing rusty chainplate / kite bolts

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skinnydoc
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Removing rusty chainplate / kite bolts

Postby skinnydoc » Wed Nov 07, 2018 5:54 am

Hi all... Just got a new used Musto, not sure of hull number but around 450. I've had it out twice in light conditions... Super fun, I know I made the right decision selling off my Aero (which I liked quite a bit too).

I have some oxidised bolts I want to remove. Only sailed in salt water. Apparently the chain plate bolts were upgraded a while ago, though there still is a bar underneath. The nut was put on top so maybe that encouraged the oxidation? Anyway I want to remove the bolts and flip them over and at the same time remove the rust staining with some FSR. Problem is getting a purchase on the bolts. Looks to me límited by the chainplate.

Pics, (I couldn't get the img thing to work)
https://photos.app.goo.gl/mkdNkSEyKeBLjpKR7

Very little clearance even for a socket. Any suggestions?

I'm also going to refinish the mast with one part varnish.

Otherwise it's in good shape!

Ben

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paul manning
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Re: Removing rusty chainplate / kite bolts

Postby paul manning » Wed Nov 07, 2018 1:43 pm

Hi Ben

It is odd that the shroud bolts are that way around.

You might be able to get a socket on the nuts, but if not, you should be able to put an open ended spanner vertically down onto the nut and it should lock between the sides of the chainplate as you unwind the bolt from underneath.
Once removed, I’d put the fixings back in the other way.
Paul Manning
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skinnydoc
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Re: Removing rusty chainplate / kite bolts

Postby skinnydoc » Wed Nov 07, 2018 5:35 pm

Thanks Paul.

Is it true that the shroud upgrade once again includes the bar underneath not the formed washers?

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Electrolysis is cause? How to prevent?

Postby skinnydoc » Sun Nov 18, 2018 2:18 am

I got the chain plate bolts out. I tried some FSR and got some of the rust stains out but others remain. I'm wondering if the oxidation is from conduction in the layup interacting with the bolts?

I will clean up the steel, maybe with steel wool, but I wanted to try and prevent recurrence ? I thought maybe dielectric.grease would do it. ?

https://photos.app.goo.gl/GCfYpVdHFX4sYk347

I also noted real chafing on the deck and bowsprit throat from the sprit. How to prevent this continuing? I thought maybe some.kind of Teflon adhesive film on the deck. ? Slippery but protective ?

https://photos.app.goo.gl/L57h6eqELC2c5cQs9

Tips appreciated.

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paul manning
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Re: Removing rusty chainplate / kite bolts

Postby paul manning » Sun Nov 18, 2018 10:06 am

If FSR hasn't got the stain off, it's worth trying your equivalent of what is sold in the UK as CIF, which is a kitchen cleaner.
Although there is carbon fibre in the laminate in this area, the gelcoat would shield it from electrolytic action. It tends to be caused by the small difference between the different grades of stainless steel in the fixings and mounting plate. You could use an isolator as you suggest, or Tefgel for example.

Regarding the bowsprit area chafing, yes, a Mylar tape is a good solution.
Paul Manning
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Re: Removing rusty chainplate / kite bolts

Postby Bruce » Wed Nov 21, 2018 1:15 am

The pole doesn't normally wear the front of the hull that much, the wear is normally on the back pole support which can require a repair if you don't protect it. If I recall correctly, I use this tape, which has been on for the last few years. https://www.pinbax.com/index.asp?Details=30236&mc=Hardware&sc=Tape&ssc=Chafe%20Tape%20and%20Jap%20Tape This tape has stuck far better than all the other variations I have tried.
Also make sure you rinse the bow area under the chute out with freshwater after each sail, as sand and dirt tends to accumulate there, which will turn your pole into a sanding device.
Bruce
GBR534

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Re: Removing rusty chainplate / kite bolts

Postby skinnydoc » Mon Nov 26, 2018 6:53 am

Thanks.

I used some Cif, it got rid of the stains alright.

I got some of this stuff TapeCase 423-10 UHMW Tape 3" x 5yds to protect the deck where the back of the sprit drags in and out. I'll also put some on the two pole supports as well. We'll see how long it lasts.

https://www.amazon.com/gp/product/B0082 ... UTF8&psc=1


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