Cat 3406A Model Won't shut off - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 03-03-2011, 05:42 PM Thread Starter
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Cat 3406A Model Won't shut off

Ok, so I am just about complete with all my repair's. I start it up, perfectly, no hesitation nothing..But the key won't shut it off..Which is all new last year..SO, I shut off my batteries, still running. I disconnect the fuel pump, BOTH wires, still running..Ok, what's left? Alternator, NOPE I disconnected BOTH POS/NEG..still running. I had to stall it out..This has happened before and I cut the frame side wire and it stopped, no more.
Questions(s):

Is there possibly something that won't let the engine shut off until possibly oil temp is up to a predetermined level ? I think not since there is no computer..
Is there a reverse voltage through ground that allows it to continue to run when all possible electrical connections are removed, ie Batteries and Alternator?
Little help here, diesel isn't getting any cheaper....

I should ad, I hear the solenoid click on the outside (frame side) of the pump when I put power to it when I am trying to troubleshoot this issue..as in power applied/removed. Thanks for the help..

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Last edited by tribaltrans; 03-03-2011 at 05:44 PM.
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post #2 of 15 (permalink) Old 03-03-2011, 08:54 PM
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Many of the "A"s were air shut down.

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post #3 of 15 (permalink) Old 03-03-2011, 09:49 PM
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Is it a 12/24 series parallel starting system?
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post #4 of 15 (permalink) Old 03-03-2011, 10:13 PM
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The reason I ask is, I have a '82 W900A w/a 92u motor. It had just started doing the same thing just before I parked it. never took the chance to determine the problem. I knew I was parking her soon, so I just clamped a pair of vice-grips on the rod on the side of the governor, flipped the hood open & pulled the rod counter-clock ways to shut her down. Pretty durn lazy, I must admit!
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post #5 of 15 (permalink) Old 03-03-2011, 11:03 PM Thread Starter
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Everything I can tell is 12V, I haven't looked at my starter which as you remember is doubtful as when it gets below 30 degrees it won't start without a boost from my van. My batteries haven't been replaced in 4.5 years so I'm leaning that way..
Hoping to hear from Ynot on this one. Prob the governor solenoid is sticking open but I even rapped on it a few times to no avail. I've driven all day, pulled in to park or fuel and it doesn't cut off, sometimes, multiple flicks on and off of the NEW ignition works..sometimes I have to stall it out if I really need to shut down.

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post #6 of 15 (permalink) Old 03-03-2011, 11:06 PM Thread Starter
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Quote:
Originally Posted by Johnp3 View Post
Many of the "A"s were air shut down.
Care to ad some detail on this? Where would I look to confirm?
Thanks,

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post #7 of 15 (permalink) Old 03-04-2011, 12:10 AM
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Some 92U s were equipped with normaly run solinoids, (needed power to shut off) most of these had engine stop buttons on the dash, but some may have had a oil pressure looped relay in the key curcuit.

Remove your shutdown solinoid and see if it is spring loaded pushing out or if it wants to stay in until power is applied. there is nothing that will fall out or anything .

Most solinoid failures are, no start , because the spring pushes the rack fully closed and the solinoild retracts to alow rack movement. the racks "normal position is low idle, the shut down either solinoid pushes it closed by spring, solinoid , or some times air .

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post #8 of 15 (permalink) Old 03-04-2011, 12:33 AM
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If on the back of the governor you have an air line going to it you have air shut down. The units I worked on had that set-up and needed air pressure to shut them down, if you have a solenoid, and wiring then it is electric shut down.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #9 of 15 (permalink) Old 03-04-2011, 02:56 AM
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Quote:
Originally Posted by tribaltrans View Post
Care to ad some detail on this? Where would I look to confirm?
Thanks,
12 volt would have (most likely) 4 batteries w/ 6 cells a piece. 12/24 would have four 6 volt batteries having 3 cells a piece.
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post #10 of 15 (permalink) Old 03-04-2011, 03:00 AM Thread Starter
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Quote:
Originally Posted by Johnp3 View Post
If on the back of the governor you have an air line going to it you have air shut down. The units I worked on had that set-up and needed air pressure to shut them down, if you have a solenoid, and wiring then it is electric shut down.
I have an airline going to the intake manifold ahead of #5 cylinder going to the top of Fuel Pump, I have a single wire from ignition to solenoid bottom front outside, another wire from ?? going to top front against the engine..
any information helpful..

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