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

[Jeff Smith]

If you go this route first, expect to replace the exhaust hose if it has not been previously replaced. My hose was impossible to remove without destroying the hose, which really did not matter because the hose was deteriorating and close to rupture anyway. Make sure you have a new exhaust elbow gasket on hand. In my opinion, at this point, you might as well install the hump hose from Catalina to lessen vibration on the neck of the muffler. 

Jeff,
-94, #121

> On Dec 12, 2020, at 9:34 AM, appleton1 at yahoo.com wrote:
> 
> 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.
> 
> ###############################
> 
>> 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)
>> 
>