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Author Topic: 4104 emergency 'shut off' solonoid question...  (Read 1793 times)
Jr. Member
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Posts: 62

« on: September 04, 2006, 05:19:50 PM »


The seller of a 4104 that I am considering has emailed me the following :

The emergency shut off solenoid is bad, which means that the air vent in the
turbo was shut and the normal amount of air wasn't getting to the engine
(blows black smoke), but I ordered a new one today and I opened the valve
and everything is back to normal and running fine.† It can run without the
solenoid without any problems, its just that it won't shut the valve if you
hit the switch† from inside if its not working.† It just took me awhile to
figure it out.

Does that sound right? or am I missing something? I thought the solonoid would shut down the engine altogether, not allow it to run rich and black smoke.

Any advice?† Undecided

thanks alot!

Barn Owl
Roanoke, VA
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PD4106-1063 "Wheezy Bus"

« Reply #1 on: September 04, 2006, 08:22:10 PM »

If something was wrong with it, could it possibly have not been closed all of the way? (If thatís possible, Iím not an expert) That might explain the symptoms. Otherwise from what I have read and heard others say, the motor will not run if the air passage is blocked.

L. Christley - W3EYE Amateur Extra
Blue Ridge Mountains, S.W. Virginia
Itís the education gained, and the ability to apply, and share, what we learn.
Have fun, be great, that way you have Great Fun!
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« Reply #2 on: September 04, 2006, 08:50:44 PM »

I guess it is possible for the shut-off to get stuck part way open but that is not supposed to happen. Sometimes they get very stiff from disuse and the solenoid wont clear the cam notch and also sometimes the shut-off valve won't work when the solenoid is tripped. The solenoid only releases the cam, the spring closes the shut-off valve.

When it is properly closed it will not run.

The 6-71 does not have a turbo unless it has been modified. He probably means the blower.

Ash Flat, AR
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'75 MC8 8V71 HT740

« Reply #3 on: September 05, 2006, 04:57:57 PM »

Reply over on BNO to this.

happy coaching!

Frozen North, Greater Toronto Area
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