[C320-list] Severe vibration at 1000 RPMs after engine mount replacement
Age Of Aquariums
dan at ageofaquariums.biz
Fri Dec 11 08:34:16 PST 2020
my perkins does the same thing , i don’t go below 1100
> On Dec 11, 2020, at 8:17 AM, Paul Borghese <packetpaul at gmail.com> wrote:
>
> A boatyard replaced the engine mounts in my Cat 320 Perkins M30 engine. The
> engine is noticeably smoother at all RPMs except one, 1000 RPMs. At
> exactly 1000 RPMs the harmonic vibration causes the engine to shake
> violently.
>
> The vibration occurs every time on every transmission setting ( neutral,
> forward, reverse).
>
> Any ideas as to the issue? I have an uneducated theory. The yard used
> off-brand engine mounts that were not tuned to the engine causing the
> severe vibration. Or maybe the bolts are not torqued to the correct
> specification.
>
> Thoughts?
>
>
> Paul
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