Pearson Yachts Forum

Pearson Boats - Common Systems => Mast and Spar Issues => Topic started by: cpbova on February 22, 2017, 06:51:07 PM

Title: Replacing mast step bolts
Post by: cpbova on February 22, 2017, 06:51:07 PM
What is the preferred method to repair a stripped mast step bolt hole.  I currently have 3/8" galvanized lag bolts.  These are very rusted, so I am replacing them with 316 SS bolts.  While replacing them I had one that will not tighten. I have searched the web, but I cannot find any recommended repair procedures.  As I see it I can install a longer bolt, install a bigger bolt, fill the hole with epoxy or drill a new hole. Just wondering if anyone has performed this repair before and what they did.
Title: Re: Replacing mast step bolts
Post by: Rusty Pelican on February 23, 2017, 12:04:40 PM
Is your mast step the original powder coated carbon steel?
When I replaced my step some of the original screws would not back out.
My mast step screws were stainless. I sheared them off and ground them down flush.
I drilled new pilot holes near the old ones for the new mast step.
Title: Re: Replacing mast step bolts
Post by: Dolce_Vita on February 23, 2017, 11:42:58 PM
When I replaced my mast step with a welded aluminum one made from 1/2" plate, two of the galvanized bolts came out and 2 didn't, shearing off the heads.
Since the step had slotted holes, I just drilled new holes for the SS lag bolts.
Be VERY careful drilling lead, as it can gall up and sieze and break the drill bit.  Go very slow, backing out the bit very often to allow the flutes on the bit to unload.
Title: Re: Replacing mast step bolts
Post by: cpbova on February 24, 2017, 06:38:28 AM
Thanks for the advice.  Since my bolts came out I might just go up a size and reuse the same hole.  I think the step bracket will accept the larger bolts.
Title: Re: Replacing mast step bolts
Post by: Captain Bri on May 24, 2018, 10:39:49 AM
My old mast step is out and I am waiting for a new one from DC Products.  The old bolts are just stubs of rust, nothing left to grab onto, vice grips just turn them to mush.  I am reluctant to grind them down because it seems that the positioning of the new step is critical.  I was thinking of leaving the old bolts stubs in for alignment purposes and drilling four new holes in the slots when I test fit the new mast step. 

Any comments on this approach?

About how long should the new bolts be (how far into the sub-surface)?  Maybe 3 inches?

Title: Re: Replacing mast step bolts
Post by: Captain Bri on June 05, 2018, 09:36:26 PM
I ended up using the old studs for marking/alignment, cut them off, and replaced with 3/8" x 2.5" bolts. They seemed plenty long enough as I would guess there is about an inch of fiber before penetrating the lead.