Recent content by Ckroeger

  1. C

    Sea Ray 40 Cummins QSB 380 Prop size

    Hi Everyone, I asked this on a different part of this forum, so sorry for the repeat. I have a 2007 Sea Ray Sundancer 40...great boat! It has twin Cummins QSB 380's and I have 21" dia x 23 pitch nibral props. I'm pretty sure I'm over propped as I cannot achieve max RPM @3060. In fact, I'm...
  2. C

    RPM + - rocker switch on dash...what's the right way to use this feature?

    OK, great information. I'm working through a problem in which my engines will not achieve max RPM (and never have). They used to get up to @ 2900 and Sea Ray told me the reason it couldn't achieve max @ 3060 is because the bottom was fouled. OK...fast forward to today, now I'm at 2700 RPM max...
  3. C

    RPM + - rocker switch on dash...what's the right way to use this feature?

    Hi, I have a 2007 Sea Ray 40 with twin Cummins QSB 380's. On the dash switch panel, I have a rocker switch that is labeled RPM + - OK, I feel stupid asking this question, but what is this toggle switch used for? Does it set the cruise control? Does it limit engine RPMs? There is nothing in...
  4. C

    Raw Water Flush Cummins QSB 5.9

    Hi, For the first time, I'm attempting to flush my raw water system on my QSB 5.9's. My question is, can I pipe a hose to the downstream port (1/4"NPT fitting just past the impeller) and run fresh water through the system without running the engine? I started doing this, but got paranoid...
See more
Back
Top