Truck won't turn off!

[jake2far]

The 13BT engine shuts off with a shutter in the intake via a vacuum pot, pulling the small rubber hose off of the pot will not kill the engine, the vacuum pot requires vacuum to pull the shutter closed, the default (hose off or low vacuum) is shutter open so the engine will run. If your vacuum is low, the VSV (vacuum solinoid valve) is faulty, or the electric signal doesn't make it to the VSV, the engine will not shut off. Shown in earlier posts was an EDIC control motor, your 13BT doen't have one, the EDIC system was found on the 3B engine. The posts talking about your clutch booster, brake booster, or alternator are all about how much vacuum does the whole system have as they are all connected together, pulling the hose off anyone of the vacuum controlled components is supposed to help you diagnose if that piece is leaking air into the vacuum system. The best way to figure out the problem is hook a gauge to the hose from the shutter valve pot used to shut off the motor and see if vacuum is present when shutting off the key, it should have above 16 inches of mercury or 16HG, if the vacuum is present than the pot is bad or the shutter is frozen, if vacuum is low or missing you need to hook the gauge up to the back of the vacuum pump (back of the alt) and see what the whole system will hold for vacuum, if the vacuum is low isolate the pump and see if the pump pulls good vacuum, if it does than hook up the pump to the system and disconnect hoses from different components plug the hose and see if you can find the leak. Leaks can be anywhere, hoses, canisters(there are 2) to store vacuum, the boosters both brake and clutch.
The failure to shut off is related to the vacuum pot not closing the shutter valve.
The post that said there was a lever on the IP was correct, the lever cuts off the fuel to the pump which kills the engine, the lever is not connected to anything, pushing it toward the front and down will kill the engine.
I would not recommend killing the engine by stalling as a sound method, the diesel engines have alot of torque, killing the engine by stalling can damage the clutch (can not will).
Hope this helps

Jim

 

[ducatiman81211]

helps

Thanks, that explains everything better. I should have specified; When I take the vacuum hose off the clutch booster and try to turn it off, nothing changes from when it was connected. I do get vacuum pulling from the pump side. I will look over everything again and see what i can find. I am gonna try and get a new vacuum pot replacement, as this one never seems to stay in the off position. Then the VSV next.
Any more ideas appreciated!

 

[jake2far]

Thanks, that explains everything better. I should have specified; When I take the vacuum hose off the clutch booster and try to turn it off, nothing changes from when it was connected. I do get vacuum pulling from the pump side. I will look over everything again and see what i can find. I am gonna try and get a new vacuum pot replacement, as this one never seems to stay in the off position. Then the VSV next.
Any more ideas appreciated!

The vacuum pot will not stay in the off position if the vacuum system has a leak, I would test the system for leaks, a good way to do it without a gauge or hand pump, use a clean hose and your mouth, hook up the clean hose to the pot and see if you can pull and hold vacuum same goes for all the parts of the system.

Jim

 

[ducatiman81211]

Thanks! Fixed it.

Thanks for the info, after reading this I started checking all grounds and re-connected/cleaned up the few near the batteries for voltage regulator and headlight relay, plus after cleaning a bit-the battery connections, and underneath the big ground cable going from transmission/transfer to the frame. Then started the truck drove a bit, and when I stopped again, IT TURNED OFF! Now it's been 4 days and all is well again! Funny how a bad ground can wreak so much havoc! I still think there's a vacuum leak someplace but for now and glad it turns off again, and will address the leak next.

I had much the same trouble just would not shut off but if I had the lights on and turned the key off then turn the headlights off with the key in the off pos the truck would shut off.... and the glow plug solinoid was sounding funny and I found a loose ground wire ans some green death on the wire as well . So I fixed it and never had the trouble since. One can only hope your problem can be solved that easy... but I would bet it is a short some place ..

 

[seaken]

Well the problem seems to have fixed itself ..I Hope..
All I can think is that it had something to do with the very aggressive power washing that I did underneath . I was laying on my back under the vehicle spaying off the mud and I am thinking water went somewheres it shouldn't have ?? It took a few months but all of a sudden it is shutting off every time .So i guess i just wait and see

Thanks for the reply's
Ken

Sent from my iPad using IH8MUD

 

[John Galt]

For future reference the 13B-T has a manual shutoff lever just below the glowscreen housing. This lever is connected to an air valve that chokes the airflow and shuts off the engine.

It's a good idea to find that lever and test it a few times so you will know how to turn the engine off quickly, even in the dark.

 

[seaken]

My truck seems to have cured itself . It has been shutting off fine now for a few months . I think it was from when I power washed it . I didn't spray down into the engine compartment but I was underneath the vehicle spraying everywhere trying to clear the mud before I had Crown rust proofing done. Water must have got into somewheres that it shouldn't have.

Sent from my iPad using IH8MUD

 

[BobBJ74]

I've had the same problem with my BJ74 from time to time. Thanks for the information Jake2far.

 

[fossilcruiser]

For future reference the 13B-T has a manual shutoff lever just below the glowscreen housing. This lever is connected to an air valve that chokes the airflow and shuts off the engine.

It's a good idea to find that lever and test it a few times so you will know how to turn the engine off quickly, even in the dark.

Is the same lever present on the 3B engine in a BJ70?

 

[ducatiman81211]

update

I ended up replacing the vacuum switch that was shorting out from water damage over time(25 years); I found 2 thru Dave and Sheldon @ G&S-I bought 1 new and 1 used both 24v.
Over 1 year now since, and many km's later- no issues.
I also relocated the new switch and extended the vacuum lines to mount it high up on the firewall.

Well the problem seems to have fixed itself ..I Hope..
All I can think is that it had something to do with the very aggressive power washing that I did underneath . I was laying on my back under the vehicle spaying off the mud and I am thinking water went somewheres it shouldn't have ?? It took a few months but all of a sudden it is shutting off every time .So i guess i just wait and see

Thanks for the reply's
Ken

Sent from my iPad using IH8MUD