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Old 05-06-2016, 09:53 PM   #21
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Originally Posted by cowlitzcoach View Post
I may be mistaken but I think that air shut off valve is either from Williams or it is a stock Detroit Diesel part.

I know my MCI with an 8V-71 had almost the save air operated fuel shut off valve.

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Thankyou! I'm going to give them a call on Monday.

I am also considering adding the electric unit. What kind would I need? Would I want the have its "relaxed" or "non powered" position be retracted so when the button is pushed it extends and shuts down the bus or one that its relaxed position is extended, power applied and it retracts to let the engine run then extends to its relaxed position to shut down? I hope that made sense.

Would one way or the other be better? I'm thinking the former would be best because it only has to be used briefly to stop the motor. Would it wear out faster always having power while to motor is running?

Thank you all for that info and the funny cartoons!!
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Old 05-10-2016, 01:09 PM   #22
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I drove an old '73 cabover Pete that had the 8V71 engine, it did not have an air-actuated cutoff, but instead, it had a red "kill" knob that one pulled to cut the engine. I just picked up an '87 IH bus with the 9 L engine that is set up with a similar "Kill knob" you pull out to cut the engine. The air cutoff works, it is simply a more "automatic" way set up to shut down these mechanical engines. If it were me, I wouldn't bother with an electrical version as the manual versions were very much the factory original setup (at least in my 2 cases), and, it's one more thing to maintain and "go wrong" over time.
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Old 05-10-2016, 01:38 PM   #23
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There have been several people that experienced bad electrical fuel shut off valves that either don't work or they work intermittently. A manual fuel shut off is a good thing.
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Old 05-10-2016, 01:40 PM   #24
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There's a satisfaction in pulling that little chrome t-handle, man.
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Old 05-10-2016, 01:51 PM   #25
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Another good part of the manual shut off is only older people seem to know how to start the rig.
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Old 05-10-2016, 02:27 PM   #26
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I have a perfectly good Cummins solenoid if anyone needs one. $25 bucks plus shipping. I am replacing it with a lo-tech but highly reliable on/off rod.
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Old 05-10-2016, 03:13 PM   #27
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There's a satisfaction in pulling that little chrome t-handle, man.
nostalgia for me from the diesel scout days.. and priceless for letting a friend drive that never payed attention and couldnt figure out how to start the scout..

-Christopher
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Old 05-10-2016, 05:07 PM   #28
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Reliability for me. Also works as a sort of security system for the truck/bus.
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Old 05-10-2016, 05:36 PM   #29
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when i got my bus from the school district, the cut off solenoid wasnt working and their mechanic showed me how to turn it off.

he mentioned that he had replaced that same solenoid 7 or 8 times and that it was an easy fix.

when i got it home, my mechanic installed that chrome T handle shut of cable. no problem since.

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Old 05-10-2016, 09:14 PM   #30
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I do like the idea of the manual shut off, however it might be hard to run it the 15 feet or so to the engine and then of course all the linkages to make it all work... I don't think I could get clear shot at it. Maybe some sort of cable system? hmmm... If I could just find an original part.
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