Neil,
It was awkward to see and corroded over. As best I can recall, it appeared
the same way as any bolt I've ever broken by applying too much torque. It
was definitely not a flat break across the face. The resulting diagonal
face added significant difficulty in getting drill started.
Josh
Josh,
Did you happen to get a look at the broken bolt looking across the face
of the break? Good possibility it was a fatigue failure which occurs at
stresses well below the breaking strength, in which case you can
sometimes see the "beach marks" as the failure works its way across the
Dennis,
Your number of 7500 lbs confirms my number of 7200 lbs. That just seems
incredibly high considering the OEM decided that 2 bolts would be
required. It also seems ridiculous that one of them broke. I am at a
complete loss as to how that would have happened.
Josh
On Tue, Feb 23,
Cast iron block. Typical M12 spec
On Tue, Feb 23, 2021, 15:36 Dennis C. via CnC-List
wrote:
> Josh,
>
> Where did you get the torque spec? Is it for the bolt? Or is it from the
> engine manual?
>
> The bolt torque spec for the bolt alone may exceed the torque for the
> aluminum block.
>
>
Josh,
Where did you get the torque spec? Is it for the bolt? Or is it from the
engine manual?
The bolt torque spec for the bolt alone may exceed the torque for the
aluminum block.
Dennis C.
On Tue, Feb 23, 2021 at 1:23 PM Josh Muckley via CnC-List <
cnc-list@cnc-list.com> wrote:
>
>
>> With
In the link is the parts manual picture. The bracket is #1 and the bolt is
#4. In the picture it only shows 1 bolt in the lower hole but the parts
list calls for 4 bolts.
https://drive.google.com/file/d/15gRsJhVMa9CsB_wXpbXfzmn25azGPPgB/view?usp=drivesdk
On Tue, Feb 23, 2021, 11:58 Neil
I'm guessing the thread degradation doesn't have much effect on the
strength as long as the shaft is not damaged. Having said that, the shear
strength of a M12 10.9 hardness bolt is about 7500 lbs.
Did I win? What's my prize? Can it be shipped or do I need to pick it
up/sail it home?
Dennis
Josh,
Not quite sure I got this right, are these horizontal bolts into the
side of the engine or vertical to the boat? In either case, though, the
bolts and plate are carrying the load - most of which is the thrust
loading of the propeller through the mounts and driving the boat - by a
