871ti would not shut off

[seacolt]

After fishing for 12 hours, when i got to the dock one of my engines would not shut off and got a real ugly colored yellow smoke from the exhaust. It shut off about 3 to 4 four minutes after shuting down the air dampener. Could this be caused by long idle time and should i expect any further problems.. I have a 100 mile steam home tommorow. thanks for any input.

 

[Passages]

When you push the "off" button, it activates a solenoid fuel valve. If the valve is not getting DC current to the coil or there is crud preventing the plunger from actuating, the engine will not shut down.

Now as to the yellow smoke - that's a new one on me...

 

[yachtsmanbill]

Extra high sulfur content fuel accumulate somewhere?? I mean as though the refinery added the sulfur in wrong amount but small enough to pass through the filters. Sulfur makes yellow smoke and melts into a liquid form at about 120F.Anything cooler it turns solid with about a 5 degree window. Not being a chemical engineer I cant say as to how it stays in suspension and passes through on the molecular level, --probably has something to do with the parafin in the fuel.
We used to inject liquid sulfur at the coal fired generating station before the days of
SO2 scrubbers and the ash coming out of a 400 foot stack was yellow for a blast of a few seconds.This may sound stupid but weird stuff happens these days. Could be the shut down solenoid was stuck with the stuff or the rack was gummed up. (??)

 

[Gina Marie]

That has happened to me on my 6 92, I had to go down stairs and manually shut the selonoid. The yellow smoke should have nothing to do with the shut down. That may be another problem. Good luck.

 

[Capten]

I've had many a shut down solonoid go bad on me. Easy enough to check and/or replace.

If it took 3-4 minutes to shut down after you closed the air dampener (emergency shut down) then you may also have a problem with the damper. The motor should shut down within seconds of shutting off the air supply. Perhaps it is not closing all the way.

Yellow smoke??????

 

[MikeP]

The air door is definitely not closing all the way. If it is, the engine will shut down immediately. I had the same problem with one engine. I pulled the airhorn and found that there was a considerable gap when the door was "closed." Took a few seconds to adjust the door and now both engines shut down appropriately.

DD states the air door shutdowns MUST be checked periodically at idle to ensure they shut down the engines. Activate them from the helm position, don't just release them while in the engine room. You want to be sure they will work immediately if an emergency occurs. You don't want to have to go to the engine room to trip them - it may be too late!

The yellow smoke was just "light black" which looks kind of yellow, caused by insufficient air.

 

[Passages]

"Light Black"

Funny, I 've never seen that on the color spectrum

 

[seacolt]

After a five hour steam home yesterday, no problems and engine shut down fine. I think i will replace the selanoid anyway. BUT I must say (boy am I glad I own a hatt) the last leg of my trip we were in 8 to 10 footers with a chop for two hours and making 14 knots. (cape cod bay for all you locals). I was in a head sea, a beam and following sea. The boat never skipped a beat. Thanks for all the replys

 

[Fanfare]

Solonoids either work or they don't. They are just spring-loaded magnets. In this one the spring holds it open. It should be on the top forward end of your engine. When you push the stop button battery voltage goes to the coil, pulls the magnet in, which pulls the rack into no-fuel position. There is usually a screw adjustment to tighten/loosen the pull distance of the rack. Have someone push the stop button and you can usually hear and see it pull in. Adjust for proper pull--the distance you can pull the lever by hand. Check this before you buy a new one. Good luck.