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Old 02-10-2017, 08:48 PM   #1
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Turning Off Your Diesel Engine

When we turn off our Luggers we first turn off the ignition switch and then push the engine kill button. Maybe there is a few seconds between them.

Today, when the mechanics were on board finishing up the annual service and were running the engines, they shut them down by simultaneously turning the ignition off while pressing the engine kill button.

I asked the mechanic why he did that. He said that they felt that it was good practice to have them both killed at once rather than having the engines running while the ignition was off as they have found that sometimes by delaying the engine kill the engine will start back up again.

Has anyone else seen this? Thoughts?
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Old 02-10-2017, 08:57 PM   #2
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I have always pressed the kill button first. Watch the oil pressure gauge go down and hear the alarm. Then turn off the ignition. That way I know they were working when I shut down the engine.
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Old 02-10-2017, 09:08 PM   #3
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On mine, the ignition has nothing to do with the running of the engine, so can be turned off or on at any time while the engine is running.
The kill switch cuts off the fuel, so the engine won't run. The starter requires the ignition to be on, and the switch is a multi position switch, so you go through "ignition"
to get to "Start"

Leaving the ignition on after shutdown does no harm, but does allow the hour meter to continue adding time.
If the alarms are sounding, turning the switch off turns off the alarms. If it gets turned on again, they don't sound again until the alternator is spinning.
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Old 02-10-2017, 09:16 PM   #4
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I am with Fog, I kill the engine with the kill switch and then turn off the ignition.
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Old 02-10-2017, 09:16 PM   #5
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On my Perkins the Key Switch has to be in the on position for the fuel shut off solenoid to function.
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Old 02-10-2017, 09:17 PM   #6
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I've worked on heavy equipment with diesel engines for 35 years and the correct proceedure for any machine with a kill button or cable operated shutdown is...
1- Stop the engine by shutting off the fuel supply
2- Turn of electrical switch
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Old 02-10-2017, 09:21 PM   #7
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Greetings,
Ignition switch? Haven't got one. Push button to start. Pull knob (cable) to stop. Hour meter only runs when engines run.
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Old 02-10-2017, 09:25 PM   #8
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Push to kill button first. If one turns off the switch well before then, doesn't that affect recorded engine-run time?
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Old 02-10-2017, 09:31 PM   #9
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Perkins, one switch. Off is off. Excepting the glow plugs.
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Old 02-10-2017, 09:32 PM   #10
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Quote:
Originally Posted by markpierce View Post
Push to kill button first. If one turns off the switch well before then, doesn't that affect recorded engine-run time?
That seems to be the agreed order. As to adding to run time - miniscule effect and not worth worrying about. My engine run-time meter died years ago. Who cares what it says as long as the engine runs well, with minimal oil consumption, and clean exhaust. How it has been used and serviced is more important than how long it has run.
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Old 02-10-2017, 09:46 PM   #11
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Quote:
Originally Posted by Peter B View Post
That seems to be the agreed order. As to adding to run time - miniscule effect and not worth worrying about. My engine run-time meter died years ago. Who cares what it says as long as the engine runs well, with minimal oil consumption, and clean exhaust. How it has been used and serviced is more important than how long it has run.
Not to step on ur toes but isn't that how you know when to service, by the amount of hours? I'm not by any means an expert so I may be wrong...
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Old 02-10-2017, 09:53 PM   #12
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Greetings,
Mr. SR. You're absolutely correct unless Mr. PB keeps separate note of the running hours.
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Old 02-10-2017, 09:56 PM   #13
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With a 6/354 NA Perkins, change the oil(s) and filters annually and it will outlast your grand-kids.
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Old 02-10-2017, 09:59 PM   #14
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I would think it's best to keep the ignition and fuel running simultaneously as long as possible to keep the engine operating within its sweet spot until the end...then kill everything at once.

Why keep one or the other running if not needed to support operation? If it's no real problem doing both at once, why not? Either one alone won't support sustained combustion but I can imagine conditions where one or the other could sustain partial combustion upon shutdown and provide an extra kick or two to the engine.

If I could avoid those extra kicks, then it's all worth it.
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Old 02-10-2017, 10:09 PM   #15
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I kill the engine and immediately turn off the key to avoid hearing the alarm. Simple enough. But I turn on the key again to read the hours of the day's cruise for the log.
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Old 02-10-2017, 10:14 PM   #16
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For me it is pressing the off button to switch the engine off and then turn off the key to turns everything off. But this must be depending on the kind of solenoid you have.
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Old 02-10-2017, 11:09 PM   #17
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Fuel off first then electric and I suspect engines with just a key follow that order. All the engine manuals I have had called for that order. Maybe it has something to do with the alternator and its electronics since if you tern electric off first the belt is still driving the unit.
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Old 02-10-2017, 11:32 PM   #18
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Curious ... Wonder what will happen if pushing the start button with the key off? Probably how the system is wired, and electricity has always been a mystery.
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Old 02-10-2017, 11:39 PM   #19
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When I read ignition, I understood it to mean electrical power to the electronics of the engine. Is that what the PO meant?
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Old 02-10-2017, 11:41 PM   #20
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I just turn off the key. Don't have a stop button.
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