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CAT 3408 Stop not working

Discussion in 'Engines' started by Globetrotter76, Dec 26, 2010.

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  1. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
    Messages:
    47
    Location:
    Cape Town - South Africa
    Hi and Merry X Mass to everyone out there.

    I have two CAT 3408 onboard, the one engine does not want to shutdown with the stop switch in the Wheelhouse/Engine room or any of the wind stations.

    My assumption is that it is obviously a common issue. I have read the manual and there is a junction box with a few relays to energize and the fuel shutoff solenoid.

    I have not opened up the junction box yet to have a look, but what do you folks reckon??? At times it is intermittent, sometimes it shutsdown and sometimes not. This is a recent problem?

    Any thoughts, I hope to open up the junction box 2 morrow to look and maybe swap out the relays to the other engine to try isolate the isssue to the relays that energize the fuel shutoff solenoid.

    Anyways I hope to hear some thoughts from those more experienced guys out there

    Regards

    Globe
  2. super termoli

    super termoli New Member

    Joined:
    Dec 23, 2007
    Messages:
    35
    Location:
    France
    I had the same problem a while back with a 3208... and it was indeed the solenoid. I can't remember what CAT service exactly did but I think they changed the whole thing and I do remember that they were not very surprised at all - seems to be a fairly common problem...
  3. Fishtigua

    Fishtigua Senior Member

    Joined:
    Jul 20, 2007
    Messages:
    2,814
    Location:
    Guernsey/Antigua
    Yep. same problem on another Cat at the moment. Shut-off solinoid down by the fuel cooler corroded up and needs replacing, new one on the way for about $250.

    This is the second time in 4 years.
  4. Silver Lining

    Silver Lining Member

    Joined:
    Sep 18, 2008
    Messages:
    118
    Location:
    Chesapeake/Florida
    Since the shutoff does not work from any station, it is most likely the solenoid or the shut off actuator itself. You should check the solenoid for its main voltage and then push the stop button and see if you get a voltage control signal (on one of the small terminals). The solenoid can be easily "jumpered" with a remote starter switch or even a screw driver across the correct solenoid terminals. You should here it click and then the stop actuator rod on the injection should actuate. You can put a volt meter on the actuator as well if the solenoid appears to be working. On my 3208 TAs the starter and stop solenoids are near each so make sure to test the correct one.
  5. Yachtjocky

    Yachtjocky Senior Member

    Joined:
    Oct 17, 2010
    Messages:
    366
    Location:
    Fort Lauderdale
    Make sure the pin has not dropped out of the soleniod actuator rod ?
  6. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
    Messages:
    47
    Location:
    Cape Town - South Africa
    Nice to hear all your thoughts, well the problem seems to be intermittent.

    I am thinking that the problem occurs when the engine heats up and the solenoid becomes more unreliable.

    I am looking at replacing them on both engines

    Thanks for your thoughts

    Globe
  7. mmss1

    mmss1 New Member

    Joined:
    Jul 11, 2010
    Messages:
    41
    Location:
    San Remo
    (A bit late answer, hopefully your problem is solved now but anyway...)

    One of our (old) 3408 had a similar problem. It turned out to be worn thread on the terminal on the solenoid causing the nut to loosen. Actually not as obvious as it may seem since you had to wiggle it to reproduce the fault.

    May save you from replacing the solenoids.

    Best regards!