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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #21  
Old 11-22-2008
hturner 12
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My 84 1/2 pt 40 has it. I have had to use it once (had problems on a short trip from the house) if you do find it good luck on trying to move it (21 years of little to no use on a cable). I went to the Detroit history page http://www.detroitdiesel.com/about/history.aspx the 87 was the first year for the electronic engine

Last edited by hturner 12; 11-22-2008 at 11:53 PM. Reason: left out some information
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  #22  
Old 11-23-2008
hturner 12
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Quote:
Originally Posted by Randy Dupree View Post
lance,any diesel can run away.
a turbo just adds to the problem.
if your turbo blows a seal it can pump lots of oil into the intake side of the engine,which could cause an engine to run away,running it uncontrolled on engine oil.
its kinda rare,but it can happen.
Randy

when I went to diesel school back in the late 90s,there was a guy in my class that worked on the marine versions he told us "that in time they did a tune up for the first run the would always point the boat toward open water, that way if did runaway they cut cut the ropes and let it go to open water before it exploded". If my memory is right a bad valve or rake adjustment on the 2 strokes is what could caused the runaway. A lot of aircraft ground power units use non turbo detroits on those the shutoff valve did shut the air off. With the electronic 4 stoke engines the ddeck would shut the engine down in the event of a possible failure.
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  #23  
Old 11-26-2008
konehd konehd is offline
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HA,

Found the cut off! Its really buried behind some wiring and hard to see...

One thing you should know on the non DDEC motors, is that until you have air pressure you have very little control of the engine.

Try to shut off the ignition after just starting it... It will run for quite a while without the key in the ignition!

That lever is the only thing that will stop it!

/Joe
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  #24  
Old 01-04-2011
Bob Johannesen Bob Johannesen is offline
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Default 8V92 DDEC II sluggish shut down

On my 91 WLWB with an 8V92 DDEC II electronic engine control, the engine shut down has started getting sluggish - that is, when the key is turned to OFF, the engine continues to run (even though sometimes I can feel it trying to quit).

I'm getting ready to read the DDEC II section of the Detroit Manual (I know, that can be dangerous!) before I "re-arrange the flow of the micro-lizards or release the magic smoke".

I have noticed that if I shift the transmission to reverse or a lower gear, when the key is off, it will often shut down as if the DDEC is "talking" to the Allison control unit.

Any suggestions as to where to start? I limit my computer work to checking power to "pin whatever and ground from pin whichever"! The bigger hammer is locked in the gun safe!
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  #25  
Old 01-04-2011
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Ed Wimberley Ed Wimberley is offline
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Bob

Check the TPS it may not be returning to "O" allowing some fuel to still flow to injectors. It should be located under the accelerator maybe it's sticking.
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  #26  
Old 01-04-2011
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Randy Dupree Randy Dupree is offline
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I would suspect the fuel shut off valve is sticky.
Keep in mind i have never seen this valve,but it has to have one,somewhere.
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  #27  
Old 01-04-2011
Bob Johannesen Bob Johannesen is offline
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Quote:
Originally Posted by Ed Wimberley View Post
Bob

Check the TPS it may not be returning to "O" allowing some fuel to still flow to injectors. It should be located under the accelerator maybe it's sticking.
I will check that - thanks!
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1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
940-300-5257

FMCA #72567, WL #1986, Vintage Birds # 345,
IBA #11205
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  #28  
Old 01-04-2011
Bob Johannesen Bob Johannesen is offline
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Quote:
Originally Posted by Randy Dupree View Post
I would suspect the fuel shut off valve is sticky.
Keep in mind i have never seen this valve,but it has to have one,somewhere.
I am searching for that also - resorted to researching the DDEC manual!!
I know that a shut off lever (as shown in the manual) is on top of the mechanical governor housing which may or may not be on an electronic engine!

The throttle position sensor is fine and seems to go full travel without any interferance.
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Bob & Judy Johannesen
1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
940-300-5257

FMCA #72567, WL #1986, Vintage Birds # 345,
IBA #11205
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