Joe brings up a good point. Have someone look at the failed bolts. It
should be evident as to whether the failure was shear or fatigue due to
a misaligned engine or twisting due to broken motor mount.
The failed surfaces will look different between a shear failure and low
cycle fatigue.
Neil Schiller
1983 C&C 35-3, #028
"Grace"
Whitehall, Michigan
WLYC
On 5/24/2018 8:20 AM, Della Barba, Joe via CnC-List wrote:
Back when I worked on boats we tried EVERYTHING – new bolts, better
bolts, safety wire, etc etc. to solve an issue like this.
What turned out to be the issue was one bad motor mount that let the
engine yank way out of position going into gear.
Joe
Coquina
*From:*CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of
*detroito91 via CnC-List
*Sent:* Thursday, May 24, 2018 6:09 AM
*To:* cnc-list@cnc-list.com
*Cc:* detroito91 <detroit...@aol.com>
*Subject:* [EXTERNAL] Re: Stus-List Coupling bolts shearing
No..but i'm going to follow up on that. Used grade 8.
Jim
-------- Original message --------
From: Russ & Melody via CnC-List <cnc-list@cnc-list.com
<mailto:cnc-list@cnc-list.com>>
Date: 5/24/18 12:37 AM (GMT-05:00)
To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
Cc: Russ & Melody <russ...@telus.net <mailto:russ...@telus.net>>
Subject: Re: Stus-List Coupling bolts shearing
Hi Jim,
My first question is, "Did someone recommend and use stainless steel
bolts, say 316L, as the "best" for marine application?"
Cheers, Russ
/Sweet /35mk-1
At 11:48 AM 5/23/2018, you wrote:
The boat in question is an 81 landfall 38.
The v-drive coupling bolts have sheared off 3 times and caused
loss of power.
Have been very careful to pause when changing gears.
The westerbeak engine runs great throughout all this. The shaft
removed and checked after the second time. The 2 bladed max prop
sent back and rebuilt. New motor mounts installed by po when
replacing engine. About 4 years ago (<200 hours on engine)
coupling. Allignment done each time and found okay.
I am looking for advice, suggestions, similar situations and
corrections. HELP
Losing confidence in boat.
Thanks
Jim schwartz
SEA YA I
38 LF
Washington nc
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
Virus-free. www.avg.com
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
