[C320-list] Severe vibration at 1000 RPMs after engine mount replacement

[Jeff Smith]

FYI - The Perkins M30 manual lists 1,000 as the minimum RPMs. I assume this has to do with balance, given that it is a 3-cylinder engine (spacing of the crankshaft journals), and that balance issues are exacerbated at lower RPM speeds. 

Jeff
’94, #121

> On Dec 11, 2020, at 12:05 PM, Dave Hupe <hoopdtwo at yahoo.com> wrote:
> 
> I agree with Dan.  My Perkins doesn't like running (especially in gear) below about 1000rpm.  When I am motoring/steering into my slip, I wind up shifting in and out of gear because I would prefer to motor slower  .... but it shutters if I try. 
> Was your shaft realigned when the mounts were replaced? 
> Dave Hupe
> 1994 C320 (#32)
> Holland, MI 
> 
>