Temp and oil pressure alarm

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  • ndutton
    Afourian MVP
    • May 2009
    • 9601

    Temp and oil pressure alarm

    Mark,
    I decided to start a new thread as this was a little off topic on the coils thread. In response to your question about my delay relay wired into the temp and alarm circuit (30 second delay before arming the alarm circuit), I connected it before the alarm buzzer on the positive side.

    To be more specific, my ignition/start switch is the standard Cole-Hersee 3 position key switch (Off-Ign-Momentary start). For the alarm circuit, I took my power source from the IGN terminal on the key switch to a single pole toggle switch located on the engine control panel (serves as an override off switch - more on this below), then to the delay relay, then to the alarm buzzer. The temp and oil pressure sensors make the ground connection to the buzzer when they are outside acceptable ranges.

    I have an electric fuel pump that I also use to purge the air after changing the fuel filter. I put a fuel grade Y valve between the pump and the carb that I use to direct the fuel either to the carb or back to the tank. Directing it back to the tank and switching on the ignition (no start), I can pump fuel through the filter in a loop returning to the tank thereby purging it. It takes about a minute. The reason for the toggle switch mentioned above is to shut down the alarm during this operation. A side benefit of the valve is that I can shut off the fuel just ahead of the carb when closing up the boat.

    Note that this delay relay only involves the temp/pressure alarm system.

    I hope I addressed your inquiry.

    Neil
    77 Catalina 30
    Neil
    1977 Catalina 30
    San Pedro, California
    prior boats 1987 Westsail 32, 1970 Catalina 22
    Had my hands in a few others
  • Mark Millbauer
    Senior Member
    • Sep 2008
    • 193

    #2
    Neil,
    Thanks again for the info. Seems like a well thought out and interesting alarm system. One of these days, perhaps this winter, we'll see, I hope to install all new gauges and re-wire the instrument panel. I may incorporate an alarm system then.
    Does your boat utilize a starter relay other than the starter solonoid?

    Mark
    Mark
    C30 "Kismet"

    Comment

    • ndutton
      Afourian MVP
      • May 2009
      • 9601

      #3
      No relay in my starting system other than the solenoid. I would expect as long as your momentary starter switch is rated for sufficient amperage you wouldn't need an additional relay and since yours has already given you problems I would make every effort to eliminate it. Depending on your existing system, this may mean increasing the wire size from the starter switch to the solenoid.

      I have an engine control panel schematic available if you like.

      Neil
      77 Catalina 30
      Neil
      1977 Catalina 30
      San Pedro, California
      prior boats 1987 Westsail 32, 1970 Catalina 22
      Had my hands in a few others

      Comment

      • sastanley
        Afourian MVP
        • Sep 2008
        • 6986

        #4
        Neil,
        I am interested in your schematic. I have a '77 C-30 as well, and I am hoping to re-wire the panel and add some new gauges this winter.

        Thanks!
        -Shawn
        "Holiday" - '89 Alura 35 #109
        "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
        sigpic

        Comment

        • Mark Millbauer
          Senior Member
          • Sep 2008
          • 193

          #5
          Neil,
          I too would like to see your schematic. Thanks so much.

          Mark
          Mark
          C30 "Kismet"

          Comment

          • Administrator
            MMI Webmaster
            • Oct 2004
            • 2166

            #6
            You have a return line to your fuel tank, independent of the pickup (a la a diesel)?

            Bill

            Comment

            • ndutton
              Afourian MVP
              • May 2009
              • 9601

              #7
              Admin,
              Yes, I do. The previous owner had replaced the fuel tank and bless his heart, the "diesel" return port was included.

              I've heard of others returning fuel via the vent port and I suppose with a properly installed vent line (uphill to the vent fitting without dips, sags or traps) it would work but please don't interpret the comment as a recommendation. For all I know, it could be a third strike felony to do so.

              Neil
              77 Catalina 30
              Neil
              1977 Catalina 30
              San Pedro, California
              prior boats 1987 Westsail 32, 1970 Catalina 22
              Had my hands in a few others

              Comment

              • Administrator
                MMI Webmaster
                • Oct 2004
                • 2166

                #8
                Neil:

                That return line gives you the makins' for a wonderful fuel polishing system.

                Bill

                Comment

                • ndutton
                  Afourian MVP
                  • May 2009
                  • 9601

                  #9
                  I agree Bill, as long as I de-energize the coil during prolonged polishing.
                  Neil
                  1977 Catalina 30
                  San Pedro, California
                  prior boats 1987 Westsail 32, 1970 Catalina 22
                  Had my hands in a few others

                  Comment

                  • Administrator
                    MMI Webmaster
                    • Oct 2004
                    • 2166

                    #10
                    Yep!

                    I've been scratching my head over a fuel polishing system for an A4 for a long time, but I never could figure out how to get the filtered fuel back in the tank.

                    Bill

                    Comment

                    • ndutton
                      Afourian MVP
                      • May 2009
                      • 9601

                      #11
                      This conversation has given me an idea that solves the coil issue during fuel polishing. I'm going to change my alarm system single pole override off toggle switch to a 2 pole, one pole for the alarm, the other for the coil. With the switch off, both the alarm and coil are de-energized and the fuel pump can polish away as long as it likes. Also, it guarantees there is no engine operation without the alarm armed. The 2 pole switch allows me to power down the coil, yet keep it out of the delay system as well.

                      I should mention also that I have 2 fuel tanks on Kalina but the bypass/return is plumbed only to one of them. This gives me the ability to transfer polished fuel from tank 2 to tank 1.

                      And finally, last year I had some concerns over stale gas. There was no problem in performance but the gas had been sitting for a long time and I didn't want even the possibility of a problem so I disconnected the return hose at the tank end and put it in a jerry can, flipped the switch and popped open a cold one while the pump did all the work.

                      Guess which way I voted on the electrical/mechanical fuel pump poll!!
                      Neil
                      1977 Catalina 30
                      San Pedro, California
                      prior boats 1987 Westsail 32, 1970 Catalina 22
                      Had my hands in a few others

                      Comment

                      • Administrator
                        MMI Webmaster
                        • Oct 2004
                        • 2166

                        #12
                        I gotta' believe there are some Senior Members watching this thread with considerable interest!

                        Bill

                        Comment

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