BOLT head in the Bilge... - Page 3 - SailNet Community
 11Likes
Reply
 
LinkBack Thread Tools
post #21 of 28 Old 02-20-2013
Senior Member
 
guitarguy56's Avatar
 
Join Date: Oct 2012
Posts: 662
Thanks: 8
Thanked 24 Times in 23 Posts
Rep Power: 3
 
Re: BOLT head in the Bilge...

Quote:
Originally Posted by SloopJonB View Post
I'm betting the shaft of that bolt is stuck really tight. I've found over the years that the single biggest reason for bolt heads failing is over tightening - someone leaned on the wrench until they felt the bolt head start to give and called it good enough.
Yes... overtightening a bolt can compromise the strength of the bolt but this is unlikely as Grade 8 bolts have a tensile strength of 150,000 psi... that's quite a bit for hand tightening... but if the bolt was over torqued I could see it failing... I believe it was more due to an overload condition on the engine causing the over torqued bolt head to break off... which is why you must change not only the two bolts shown on the photo but all bolts holding this engine... bolts are cheap... ruining your alignment is more costly... The preload, or thread tension in a fastener is higher when the type of steel being used is grade 8 in quality which if you can get aircraft bolts that would be the best overall grade.
guitarguy56 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #22 of 28 Old 02-20-2013 Thread Starter
Future liveaboard
 
Join Date: Feb 2006
Location: Wisconsin/Lake Michigan
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Re: BOLT head in the Bilge...

THANKS EVERYONE... Sure got a ton of replies and advice, and I appreciate all of it! Here's what I did...
Lined up the local boat yard to do the work if what I was going to try failed. Then, walked to Home Depot. Bought a bottle jack, a breaker arm (long socket wrench), PB Blaster Penetrating, and a big Visegrip (I only had the medium size). Last night I PB Blasted the bolts. This morning I put the jack in the bilge under the stern end of the engine, jacked it tight, but not enough to move it. Then with my fingers crossed I put the big wrench on the remaining upper bolt and slowly cranked. Woohoo, it moved. I removed it. That was probably a 5 inch bolt with threads only at the end (odd since the broken head had threads right to the head). Next I removed the bracket by taking off the upper nuts on the mount. Then I got the big Visegrips and put it on the end of the now revealed broken bolt. It moved so easily I thought the wrench had come off. I removed it with my fingers. It was only about 1.5" long and all threads. So the two bolts were different. I thought I would be visiting a hardware store or the boat yard for a new bolt, but a quick look in my stock and I saw I had three SS bolts that were identical to the broken one. I used a lock washer and one of those bolts to reassemble.
I suspect that the bad bolt was very tight, and then when the opposite corner was raised during the alignment it stressed the neck of that bolt and it eventually gave way. I'm just glad I found it.
Thanks again!
SailMonkey is offline  
Quote Quick Reply Share with Facebook
post #23 of 28 Old 02-20-2013
Senior Moment Member
 
SloopJonB's Avatar
 
Join Date: Jun 2011
Location: West Vancouver B.C.
Posts: 11,610
Thanks: 60
Thanked 72 Times in 69 Posts
Rep Power: 5
 
Re: BOLT head in the Bilge...





Sounds like the correct bolt got lost and something that was at hand got substituted.

Congrats and now head out and buy a lottery ticket.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
SloopJonB is offline  
Quote Quick Reply Share with Facebook
post #24 of 28 Old 02-21-2013
Member
 
Join Date: Dec 2011
Location: Wilmington NC
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
 
Re: BOLT head in the Bilge...

Good Job lesson learned. Broken bolt heads are almost always from loose bolts & vibration. Make sure you check your alignment & repair vibration issues


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
May you weather all storms
dorymate1 is offline  
Quote Quick Reply Share with Facebook
post #25 of 28 Old 02-21-2013
Seņor Member
 
PorFin's Avatar
 
Join Date: Sep 2007
Posts: 1,446
Thanks: 8
Thanked 20 Times in 20 Posts
Rep Power: 8
 
Re: BOLT head in the Bilge...

Monkey,

Congrats on the success!

Just a thought: If your replacement bolt is identical to the one that snapped, then keep a close eye on it. From your description it seems to differ from the others, and it sounds like it may not be up to the task for long. You might want to consider finding a bolt that's identical to the one that didn't break.

Best,
PF


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
________
'85 BYB Vagabond 39
PorFin is offline  
Quote Quick Reply Share with Facebook
post #26 of 28 Old 02-21-2013
Senior Member
 
bljones's Avatar
 
Join Date: Oct 2008
Location: South Coast Ontario
Posts: 8,480
Thanks: 35
Thanked 91 Times in 81 Posts
Rep Power: 8
   
Re: BOLT head in the Bilge...

Congrats!!

It's 5 o'clock somewhere:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bljones is offline  
Quote Quick Reply Share with Facebook
post #27 of 28 Old 02-22-2013
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 11,226
Thanks: 46
Thanked 237 Times in 222 Posts
Rep Power: 7
   
Re: BOLT head in the Bilge...

Read the entire escapade in one shot, so was glad to hear the positive outcome.

However, I second the concern that you use the correct bolt and not just what you found in your stock.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Quote Quick Reply Share with Facebook
post #28 of 28 Old 02-22-2013
Senior Member
 
blutoyz's Avatar
 
Join Date: Oct 2012
Posts: 661
Thanks: 10
Thanked 14 Times in 13 Posts
Rep Power: 3
 
Re: BOLT head in the Bilge...

It is nice to read about an easy fix for once...LOL
blutoyz is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Bilge Paint in the Head? CalypsoP35 Gear & Maintenance 2 01-24-2013 09:50 AM
Keel Bolt/Bilge Issues SailingWebGuy Gear & Maintenance 7 02-11-2011 05:00 PM
Shallow Bilge, Bilge Pump Switch labestia Gear & Maintenance 1 07-10-2009 02:40 PM
Teak Bolt Head Cover dougklay Gear & Maintenance 7 12-12-2008 03:16 PM
rust in the bilge from a bolt... sara_lugli Gear & Maintenance 3 02-04-2004 03:23 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome