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

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Old 05-11-2011
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rselin rselin is offline
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Default CAT 3208 Run On / Slow Shutting Off

Twice today I turned off the key and it took 5-10 seconds for the engine to stop. First (and second) time it's happened in the 9,000 miles I've put on it. I heard this was a problem with the Detroits but didn't know it might be a problem with the 3208. Any ideas?

I'm at So. Oregon Diesel getting a service done tomorrow so I'll mention it to them.
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Old 05-11-2011
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Rich, have you checked/replaced the fuel shut-off solenoid?
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Old 05-11-2011
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Quote:
Originally Posted by Hoagie View Post
Rich, have you checked/replaced the fuel shut-off solenoid?
Nope. Don't know where it's located either. The guys at SOD should be able to find it though.
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Old 05-11-2011
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Quote:
Originally Posted by rselin View Post
Twice today I turned off the key and it took 5-10 seconds for the engine to stop. First (and second) time it's happened in the 9,000 miles I've put on it. I heard this was a problem with the Detroits but didn't know it might be a problem with the 3208. Any ideas?

I'm at So. Oregon Diesel getting a service done tomorrow so I'll mention it to them.

Richard,

You probably are referring to the subject below that has been mentioned from time to time about Detroit's here on the forum;

Quote:
http://en.wikipedia.org/wiki/Diesel_engine_runaway
From Wikipedia, the free encyclopedia


Diesel engine runaway is a rare condition affecting diesel engines, where the engine goes out of control, consuming its own lubrication oil and running at higher and higher RPM until it overspeeds to a point where it destroys itself either due to mechanical failure or engine seizure through lack of lubrication. For instance, a 1800 rpm engine can run to 4000 or 5000 rpm or beyond.
Wanderlodge Owners Group > Mechanic's Corner > Engine > Caterpillar 3208 Related Files

What it sounds like to me is exactly what Hoagie mentions in his post. The fuel shutoff solenoids is most likely the problem, that and possibly along with the combination of a power source problem for the solenoid. The solenoids requires a good 12 volt power source to hold the solenoid in the Fuel On position and when power is removed from it the solenoid plunger moves in the opposite direction and shuts the Fuel Off, there is a spring around the plunger to hold it in the Off position, this spring could be either broke or weak, or the plunger may need to be cleaned. The solenoid is easy to remove for inspection and testing.




The ignition switch is the source of the 12 volts for the Fuel Shutoff Solenoid on my 1982 FC and that can also be a weak spot, I had to replace my ignition switch and I removed and then routed the 12 volts source through a separate 50 toggle switch and then to the solenoid. Wanderlodge Owners Group > Mechanic's Corner > Electrical > Ignition Switch Part Numbers




Another solution to the voltage problem with the fuel shutoff solenoid is to add a TYCO (Bosch) relay to make sure that there is a good 12 volt source going to the solenoid;

If this is not the problem then I would be checking inside of the injector pump, but first check the easier less expensive things to fix. Keep in mind that your 1992 SP may be wired entirely different than my FC.
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Old 05-11-2011
Friday1 Friday1 is offline
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Quote:
Originally Posted by Hoagie View Post
Rich, have you checked/replaced the fuel shut-off solenoid?
See Hoagie, I told you you would be giving advice after your knowledge bank got started. Good call!

-Rick in Ohio
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Old 05-11-2011
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Initial inspection today was inconclusive. We started and stopped the engine several times and it worked fine. It might be a problem that only shows up when the engine is warm. I climbed Siskiyou Pass yesterday and the engine was working pretty hard.
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Old 05-11-2011
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I guess any diesel cycle can runaway. It's just the nature of the beast.
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Old 05-11-2011
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could have a funny ignition switch, OR if there is a relay powering the solinoid that could be the culprit. Relay would be the preferred method to control the solinoid, don't know if that was OEM in the SP's. Maybe BB got it together by then, didn't in my 83, had to do it myself.
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Old 05-11-2011
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FWIW, I am with Mike on this one... sounds like some kind of phantom feed from somewhere Now I know this is not much help though, sorry
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  #10  
Old 05-12-2011
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The siskiyous pass thats a mean pull done that a few times. Nice rv park at the seven featheres
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