. Wolford
via CnC-List
Sent: Saturday, May 26, 2018 09:12
To: cnc-list@cnc-list.com
Cc: Matthew L. Wolford
Subject: Re: Stus-List [EXTERNAL] Re: Coupling bolts shearing
Not sure of the weight for my Westerbeke (will look), but I use Shell Rotella
heavy duty oil for diesel engines. Don’t use the
ssage
From: detroito91 via CnC-List
Date: 5/25/18 6:31 PM (GMT-05:00)
To: cnc-list@cnc-list.com
Cc: detroito91
Subject: Re: Stus-List [EXTERNAL] Re: Coupling bolts shearing
Thanks.
First step is today...grade 10. Previous bolts were grade 5.
I do like the idea of having someone lo
ito91 via CnC-List
Date: 5/25/18 6:31 PM (GMT-05:00) To:
cnc-list@cnc-list.com Cc: detroito91 Subject: Re:
Stus-List [EXTERNAL] Re: Coupling bolts shearing
Thanks.First step is today...grade 10. Previous bolts were grade 5.I do like
the idea of having someone look at the old bolts. They w
ist.com Cc: "Della Barba, Joe" Subject:
Re: Stus-List [EXTERNAL] Re: Coupling bolts shearing
Once you get your new bolts in, get someone to shift F-N-R while you watch the
engine and motor mounts. See if one or more of the mounts is allowing excess
movement.
For once I am glad to n
Once you get your new bolts in, get someone to shift F-N-R while you watch the
engine and motor mounts. See if one or more of the mounts is allowing excess
movement.
For once I am glad to not have rubber motor mounts, my engine is hard-bolted to
the boat.
Joe
Coquina
From: CnC-List [mailto:cn
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.
Ne
Set a couple o' dial indicators on the v-drive,
near the coupling, and cycle her in & out of
gear. The dial indicators will show any
deflection and the amount. You might have to move
them around and try different angles to get the full picture.
Cheers, Russ
At 05:20 AM 5/24/2018, you wr
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...@
!Check your motor mounts!
They can be sheared through or very loose and look OK when not in gear. When
you go to shift, the engine shifts on the bad mount(s) and shears the bolts.
Joe
Coquina
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of ed
vanderkruk via CnC-List
Sent: Wed
