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  #21  
Old 02-20-2013
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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.
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  #22  
Old 02-20-2013
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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!
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  #23  
Old 02-20-2013
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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.
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Old 02-21-2013
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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
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Old 02-21-2013
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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,
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Old 02-21-2013
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Re: BOLT head in the Bilge...

Congrats!!
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Old 02-22-2013
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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.
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Old 02-22-2013
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Re: BOLT head in the Bilge...

It is nice to read about an easy fix for once...LOL
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