Seized Halyard Deck Sheave Bolt

rgranger

rgranger

.
Jan 19, 2010
12,565
Hobie 16 & Rhodes 22 Skeeter Charleston
If you blow the hole in the aluminum plate, you can re-tap and thread one size up.

I keep one of these in my boat tools and have ended up using more than a few times.

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Ralph Johnstone

Ralph Johnstone

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Jan 4, 2006
7,264
Hunter 310 West Vancouver, B.C.
Project_Mayhem said:
is most likely to happen when the two fasteners expand/contract at different rates
Click to expand
It's most likely to happen when the hole in the outer material (in this case the aluminum plate) expands more, than the diameter of the SS bolt.

However in this case, the coeff. of linear expansion of the aluminum is greater than the coeff. of linear expansion of the SS which complicates things. You can blame @kloudie1 for this little wrinkle.

If done correctly, the bolt will be looser in the hole.
 
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Ralph Johnstone

Ralph Johnstone

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Jan 4, 2006
7,264
Hunter 310 West Vancouver, B.C.
Project_Mayhem said:
If the hole was enlarged in the fiberglass, filled and tapped, would it be strong enough for most deck hardware?
Click to expand
Wouldn't be strong enough to hang a dish towel on.

Where a Hunter gets the strength without nuts and a loading plate on the opposite side of the FG is with the buried and tapped aluminum plate between the layers of FG.
 
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rgranger

rgranger

.
Jan 19, 2010
12,565
Hobie 16 & Rhodes 22 Skeeter Charleston
Ralph Johnstone said:
Wouldn't be strong enough to hang a dish towel on.

Where a Hunter gets the strength without nuts and a loading plate on the opposite side of the FG is with the buried and tapped aluminum plate between the layers of FG.
Click to expand
Right!
You need to tap a larger size into the aluminum plate
 
Q

QCI

.
Jan 30, 2014
31
Hunter 25.5 Bradenton
Got it out! thank you all for the help!
I used WD Specialist Penetrant over the course of 4 days. Applied it in the AM and the PM. Then used the manual impact driver that rgranger suggested. I marked the screw head with a Sharpie to see if it was turning. It took time & patience but it worked. I will use anti-seize lubricant when I reinstall. And a new bolt. Thanks again!
Also, ya gotta give me props for using the word sheave instead of pulley.
 

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Project_Mayhem

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Sep 24, 2018
3,407
Catalina 30 MKIII Chicago
Patience is key! I read of one guy that had a seized antique engine. His plan was to fill all cylinders with penetrating oil and get them to move 1/8" once a month. He predicted it would take him four years at this rate!
 
garymalmgren

garymalmgren

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May 29, 2018
588
Canel 25 foot Shiogama, japan
Hi QCI
Thanks for coming back with your result.
Will help someone else out down the road.

gary
 
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