[C320-list] Vibration at 1000 RPMs and Perkins Injectors?

[appleton1 at yahoo.com]

Check the exhaust elbow for soot/rust build-up, which can severely restrict flow. Back pressure wreaks havoc on the entire combustion process, but is often overlooked in diagnosis. Ask me how I know.
- Joe, s/v Assignment, #103 1994 ~2,000 hrs.

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> On Dec 12, 2020, at 8:29 AM, Jeff Smith <jeffreyssmith at live.com> wrote:
> 
> Max RPMs on the Perkins is somewhere between 3,400 and 3,500. If you are only getting 2,700, it sounds like a fuel restriction issue. I just chased a hard start problem (injectors), followed by reduced RPMs under load (I could get 2,100). My reduced RPMs was an issue with my injection pump. I had all of my injectors rebuilt ($240) and my injection pump rebuilt ($360) and everything seems to work fine now, though I winterized after a brief sea trial, so I did not get an extended test under load. We usually only use it to get it and out of the slip, though, so I am happy. 
> 
> Good luck. It took me forever to get this figured out.
> 
> Jeff Smith
> ’94, #121
> 
>> On Dec 12, 2020, at 8:19 AM, argates2nd at comcast.net wrote:
>> 
>> Since launch in FL two weeks ago, my 1995 Hull #182 Perkins has expelled grey smoke.  There is no water in the Raycor separator and the fuel is fresh. RPMs seem normal and top out at 2700 under load.
>> A mechanic says it may be due to a stuck injector.  Does anyone have relevant experience?
>> Thanks, Rollie
>> 
>>> On 12/11/2020 1:46 PM Christian <ccaper at gmail.com> wrote:
>>> 
>>> 
>>> Just another post sharing same as others about Perkins, once we drop below
>>> 1100, it's like in the middle of an earthquake, and rattles my nerves every
>>> time.
>>> -Christian
>>> #138 (Perkins, 1994 C320)
>