[C320-list] Perkins M30 diesel water temperature sending units

[Charles Holbrook]

 Thanks for your detailed explanation of your wiring and alarm system.  I too have a 1995 Cat 320 #192 and I had an engine temp. issue last year but my audible alarm and red indicator light worked.  Glad to know that as I never tested it.  Turns out a small fish got sucked up into the intake.  The strainer stopped anything from getting into the cooling system but I had no water flow and a couple of pump impellers were damaged.  I just jury rigged my air compressor hose and gave the main water intake a short blast of air and it cleared out the system. 
Charlie Holbrook, Port Clinton, Ohio"Nautigirl"   
    On Wednesday, January 15, 2020, 08:16:45 PM EST, Troy Dunn <troutwarrior at gmail.com> wrote:  
 
 Bob

Unfortunately my 320 has a Yanmar engine so take my advice with a grain of
salt.

Typically a 'sender' operates a gauge, and a 'switch' operates an alarm.
I suppose you could incorporate a sender and a switch into a single device.
  Not sure how your engine is configured.  Switches do fail, and if the
sender is still good but the switch has failed you would get the situation
you are describing.  Your hull is quite old,  it's entirely possible your
controls are no longer configured with the original senders and switches.

Hopefully someone with your engine will chime in soon.

I know you included your Hull# in the body of your email.  Be sure to
always include that in your signature line so folks can determine how
closely your hull is to theirs.  The 320 has changed quite a bit over the
years.

Congrats on the new boat and welcome to the neighborhood.  GYB is one of
our typical overnight trips.

Troy Dunn
Hull #514
Wonky Dog
Tidewater Marina, HdG, MD