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Shutting off a Detroit 92 series

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Ben Rauls

05-23-2006 22:17:49

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Had a 92 series Detroit running backwards at work. Whats the right way to shut them down when they do that? Ive never seen it happen before. What we ended up doing was shooting a Co2 fire extingwisher (spelling?) down the exhaust, good thing it had a rain cap on it, took 2 of us to pry that rain cap up then she took off for a few seconds till i fed it some Co2. was worried about blowing the think up, man was it smoking!!
Ben

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85_Ranger4x4

05-24-2006 07:16:57

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

Make sure it is a thick book, with that much suction it could inhale a smaller one, I have heard of it happening. We always have a board handy when test firing a fresh diesel engine just in case.

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RodInNS

05-24-2006 06:28:18

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

Shut off the fuel, or shut off the air. Don't see why you couldn't just pull the fuel shutoff? That should have killed it. It was only running backwards. You could also load it down and stall it. That works. They probably have the emergency shutdown too. The 71's had that; the ones' I've seen anyway. However, that's only on the intake. If it's running backwards, it should be expelling through the blower. I would think it would just blow the emergency flap up, and keep pushing out... So if she took oil for her fuel, and you couldn't stall it, you probably did the right thing. You took away her air, the only way you could.
I remember a guy telling me a story about driving a truck with a silver 92 in it a number of years ago. He came down off the mountain over here, crossed the bridge, and started up another hill. All the way up the bridge ramp she was pullin good, and he was feedin' her gears. He was still going up hill loaded, still pullin' and he hit 15.... ran clear out of gears... Oh boy.... Somethin's goin on here... Looks in the mirror, and he couldn't see the road for smoke, and the old devil is still gaining. Was he ever glad for brakes that day. He pulled the shutoff, and laid into the linings. He was very lucky to stall her out in the top gear... I don't know if the rack stuck that day, or she just tunred the blower seal, but something went wrong.

Rod

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Ben Rauls

05-24-2006 07:29:02

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Re: Shutting off a Detroit 92 series in reply to RodInNS, 05-24-2006 06:28:18

I pulled the fuel shut off on the top of the engine and wouldnt shut down. These are are old military trucks, theres not much for saftey as far as emergency shut down, the only thing is a cable that goes to the fuel shut off but most of those cables are broke when they come in.
Ben

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jdemaris

05-24-2006 06:04:45

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

I'm not a Detroit Diesel expert - but we had many small ones to work on at our Deere dealership. Besides the Deere's using the little 2-53s, we had various wheel-loaders, crawlers, and log skidders with 3-53s, 4-53s, 2-71s, 3-71s, etc. including Franklin, Pettibone, Timberjack, Clark, Allis Chalmers, etc. Also worked on a couple of 8V-92s. Most that I worked on had the emergency shut-offs that choked off air supply at the blower. If we were working on a Detroit that did NOT have it, someone would be standing by with a rag to plug the air-intake to avoid motor run-away. We had a large truck shop across the road. The mechanic there told me that they sometimes would get a larger Detroit that would keep on running - even with the emergency shut-off closed. He said the engine, when choked, would suck crankcase oil through worn valve guides and blower seals - an it was just enough to let the engine keep on chugging away.

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Sid

05-24-2006 03:50:53

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

I have only had this happen twice so my experience is limited. Both times the engine stalled under a heavy load and when rolled backward the engine started in reverse. Niether one of them over reved. In fact they had very little power at all and would hardly run. I simply started the engine both times. From what experience I have had with desiel and what I understand about them is they will not run with fuel. So I do not know why simply shutting the fuel off would not kill the engine. I am not doubting what you say happened but it seems to me that an engine running backwards everything would be out of time and that it would not run away with itself.

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Sid

05-24-2006 03:56:51

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Re: Shutting off a Detroit 92 series in reply to Sid, 05-24-2006 03:50:53

Should have read with out fuel. And yes Texas Jim Blocking the air intake will stall the engine does on my tractor any way.

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Sid

05-24-2006 03:50:58

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

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JDknut

05-24-2006 03:31:11

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

Air intake. The emergency shutdowns on the 71 series "Jemmies" have flapper valves in the air intakes, I'm pretty sure the other series had them too, depending on application. The 6-71 bus I drove had one.

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Tx Jim

05-24-2006 03:08:15

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Re: Shutting off a Detroit 92 series in reply to Ben Rauls, 05-23-2006 22:17:49

Ben,years ago I was told if diesel engine over-reved to cover air intake with a thick object such as a book. So maybe that theory won't work as it would appear that rain cap should have done same thing on exhaust pipe if engine was turning backwards. Tx Jim

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