Engine shutdown

   / Engine shutdown #1  

choffman41

Bronze Member
Joined
Aug 28, 2007
Messages
64
Location
Sierra Foothills of California
Tractor
Yanmar 2301
Any pros or cons between shutting down the engine using compression release vs. using the throttle lever to cut the fuel?
 
   / Engine shutdown #2  
I've heard you shouldn't use the compression release to shut off the motor. Use the throttle! In the event of a runaway though (diesel engine starts to burn its own oil) you can use the compression release to shut it off.
 
   / Engine shutdown #3  
It was my understanding that using the decompression release to continually shut down a Yanmar diesel will weaken and distort the exhaust valve faces and seats.

I don't know how true that is, and I don't shut down the tractor that way so I can't really say either way...but it did sound logical.

Mark
 
   / Engine shutdown #4  
mark777 said:
It was my understanding that using the decompression release to continually shut down a Yanmar diesel will weaken and distort the exhaust valve faces and seats.

I don't know how true that is, and I don't shut down the tractor that way so I can't really say either way...but it did sound logical.

Mark

Ditto.
 
   / Engine shutdown #5  
Agree with others the compression release in not the recommended way to shut the engine down. On newer models you shut the engine off with the "ign" switch just like with a gas engine.
 
   / Engine shutdown #6  
If you turn the ignition off with the engine still running on some of the older tractors like mine, do you risk damaging the charging system? My dad had a sailboat that if you turned the battery bank switch off while the engine was off you could kiss your alternator goodbye!

Sorry to get off topic, just curious!
 
   / Engine shutdown #7  
Ditto on the "no" on using compression release to stop the engine.

As far as turning the key to off while running, I've read that this is acceptable- I read this in hardprinted literature and will take some time over the next day to look it up for you.

The key isn't for ignition since it's diesel, but to run the starter. So, I think it's out of the loop after running <but again, i'm not sure> I'll let you know if I find what I'm recalling. You could also test with a voltmeter and see if something strange happens at the alt after removing the key...
 
   / Engine shutdown #8  
Cites from the YM240 Operation Manual: (same engine as YM2000)

"IMPORTANT Always leave key turned on, in position 'ON', while engine running."

and

"IMPORTANT Do not use decompression lever to stop engine."
 
   / Engine shutdown #9  
California said:
Cites from the YM240 Operation Manual: (same engine as YM2000)"IMPORTANT Always leave key turned on, in position 'ON', while engine running."

Don't you hate it when instructions tell you NOT to do something but don't tell you why? You have to wonder why! Is it because it will damage my alternator? Is it because my gauges don't work while the key is off? Is it because the key may fall out of the ignition switch and get lost? :confused:

I frequently turn my key off and remove my keys while the tractor is running to give someone the keys to unlock a gate, move my truck, etc., so far, with no bad results.:)
 
   / Engine shutdown #10  
California said:
Cites from the YM240 Operation Manual: (same engine as YM2000)

"IMPORTANT Always leave key turned on, in position 'ON', while engine running."
...

The Electrical Schematic for my YM2220 shows a power feed back to the regulator from the same line that provides power to the temp and fuel gauges. Possibly a voltage sensing feed for regulating alternator output??

Lacking an internal schematic of the regulator (and more importantly, lacking the knowledge to read that schematic even if I had one) I don't know what happens if that voltage goes to zero while the alternator is running - unregulated output from the alternator???

I do know that I've frequently turned off the master switch with the engine running. I also know that I've replaced two regulators. Is there a connection between those two events? Not necessarily, but certainly possible. I think I'll be a little more concientious in the future about not turning off the master switch with the engine running.

Thanks, California.
 

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