[C320-list] Yanmar 3GM30F motor mounts

[John Meyers]

Ted,

It is possible for a mounting "bolt" to be bent by a very hard grounding
while under way. The engine still wants to go forward while the rest of the
boat stops.

John Meyers
#406 Wind Chime
Muskegon, MI



On Mon, Mar 25, 2019 at 9:45 AM <tharrison at innovations-plus.com> wrote:

> First thanks for prior information on the topic. I went to the boat
> yesterday  (sitting on the hard) and replaced the two front motor mounts.
> They are not cheap.
>
>
>
> I am planning on replacing the aft mounts as soon as they arrive. It is not
> a difficult job to replace the mounts. I placed two 2 x 3's under the
> engine
> for additional support as I change one mount at a time.
>
>
>
> If you have all the tools it only takes about 30 minutes to replace the
> mounts.  I used a gauge to measure the distance between the nut on the
> mount
> and the bottom nut on the mount.
>
>
>
> I did discover a couple of interesting items and concerns. Perhaps someone
> could help / advise if this is a concern.
>
>
>
> 1.       There are two screws (about 2.5 inches) that hold / fasten the
> mount to the boat stringers. They look like a lag bolts. The front one, on
> the port side was actually bent.
>
> What material are these bolt going into? Wood? Metal plate?
>
> What could be the cause of this one bolt to be bent? Of the four bolts I
> removed only the front port bolt was bent? Not a sever bend. But the bolt
> is
> not straight. To replace this bolt - what is it really - a 9/16th stainless
> steel lag bolt?
>
> 2.       The 2 bolts that attached the mount to the engine on the port side
> were rusted. They had an 7 marked in the head. I look through the Yanmar
> manual and I do not see how water could be getting to these bolts. Any
> thoughts?
>
>
>
> When replacing the bolts that attach the mount to the engine. Should I use
> blue lock tight on the bolts?
>
>
>
> Thanks for your help.
>
>
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>
>
> Ted  Harrison,
>
> Magic Moment
>
> Hull 424 , 1997
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