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CAT3126 Oil Pressure Sender

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by david_h, Sep 21, 2020.

  1. david_h

    david_h Member SILVER Sponsor

    54
    Aug 9, 2015
    Lake Simcoe, Ontario
    2000 Sea Ray 400 Sedan Bridge (400DB)
    CAT 3126 350 HP
    Transmissions: ZFMarine IRM 220 A-1
    I have a pair of CAT 3126s on my SeaRay. The Port helm oil pressure gauge is very bouncy, and wavers all over the place. The engine mounted oil pressure gauge is steady. Also, I swapped the helm oil pressure gauges, and the port helm oil pressure gauge is still bouncy after the swap.

    So, I believe that I have eliminated the helm gauges, and the oil pressure is OK, given the engine mounted gauge being steady.

    I noticed a previous thread on this matter, here:

    http://www.clubsearay.com/index.php?threads/cat-3126-oil-pressure-transducer.43781/

    And here is a picture included in the previous thread:

    Sender.png


    A few questions:
    1. Is the oil pressure sender for the helm mounted gauge, item A, or item B, or something different?
    2. Can we confirm that the oil pressure sender for the engine mounted gauge is another item?
    3. Can the oil pressure sender for the helm mounted gauge, be changed with the oil full?

    thanks,

    Dave
     
  2. 920richardf

    920richardf Member

    74
    Dec 25, 2007
    Great Lakes
    2000 410DA
    CAT 3126TA
    1. Item B
    2. Engine mounted gauge is mechanical
    3. Yes
     
    dtfeld likes this.
  3. david_h

    david_h Member SILVER Sponsor

    54
    Aug 9, 2015
    Lake Simcoe, Ontario
    2000 Sea Ray 400 Sedan Bridge (400DB)
    CAT 3126 350 HP
    Transmissions: ZFMarine IRM 220 A-1
    Hey Rick, thanks so much! It looks like the connector is held on with a bolt, so that is something for me to check, (tightness, clean), before I order a replacement.

    And, I guess I can follow the wiring from the engine mounted gauge, to see where the 'mechanical' sender is located, (just for my own curiosity).

    Thanks again!!

    Dave
     
  4. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Try cleaning or replacing the ring connector on the end of the wire that is attached to the sender.
     
  5. david_h

    david_h Member SILVER Sponsor

    54
    Aug 9, 2015
    Lake Simcoe, Ontario
    2000 Sea Ray 400 Sedan Bridge (400DB)
    CAT 3126 350 HP
    Transmissions: ZFMarine IRM 220 A-1
    As it turns out, the connector was faulty and needed to be replaced. I cleaned up the post on the sender as well. All good now. Thanks for everyone's input.

    Dave
     
  6. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy
    3126 Cat's
    Connection @ sender, connection at engine wiring harness, connection @ back of helm gauge all possible places to review... don't ask me how I know :)
     

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