Kohler dieseling at shutdown

[Jeff]

Hardly a personal attack. Maybe a little drama on your end is all I see. Since you reported this Scott, I'm answering it.

[Chuck White]

Welcome to the Forestry Forum, tnsnakebite.

[ScottInCabot]

I don't think anyone was attacking you Scott. The man was simply saying that any engine including turbo diesels need to cool down before killing them. A turbo won't backfire if you don't cool it down but will soon enough suffer the consequences the same as a gas engine would.  Attacks around here are few and far between. This is just not that kind of forum. 

Fair enough.....was a long day, and since it's impossible to convey 'intent' on anything where typing is concerned....apologies from me please.



Question for the 'group'.
In your manual(I've read it to great lengths), exactly how long does the 'manual' say to let engine idle before turning it off?

-Mine states-  quoted from manual word-for-word

Let the engine run for 15 seconds with no load, then turn the key switch to the OFF position.

I wait much longer then that, although I have never used a stop watch....carrying flitches and boards, stacking, and such probably take longer then 30-45 seconds?  On a side note, the little B&S 10horse I had on the LT10 never backfired, and I'd often shut it down really fast.

As I said before.....humbly, I'm not as concerned with the 'farting', if it were backfiring through the carb(it'd be different).  The dieseling, to me is the problem.  Was just wanting to find out from other LT28 owners with this engine configuration if this was also an issue from them....





Scott in Cabot

[terrifictimbersllc]

Not every single comment in a thread is always directed to the original poster.

The 30HP Kohler gas engine on my Peterson will backfire loudly almost all  of the time, and run backwards occasionally a bit too, if I hit the kill switch at full RPM.  If I push the throttle down and wait several seconds before killing it, there is mostly no backfire and no running backwards.

[Dave Shepard]

I'm not attacking anyone. It can be hard to convey an idea over the internet, especially when being so limited by trying to do it over a smart phone. If you think that I'm attacking, you are mistaken. If I was critical of anyone, it was bkaimwood, and the thought that buying a new piece of equipment had anything to do with the best operating practices. All manufacturers are faced with the difficulty of less than ideal fuel properties and spa regs. If idling is necessary to prevent this issue, then so be it.

[Jim_Rogers]

bkaimwood:
In post #8 you said: "check for the right color". but for us non mechanics that isn't the best advice unless you tell us what the right color is, or what the wrong color is. I don't know either of them, and would find it helpful if you would tell us the colors you are talking about. Thanks, this is just asking for more information to understand how things are suppose to run.

Jim Rogers

[snowshoveler]

If I read it right, the mill is still "new" and will require many more hours of use to break in.
It is getting hot because its still stiff and will get better with time.
The cool down period will help and you will learn what makes the engine happy.
The dieseling/run on is just because its hot.
I know you said you go out of your way to make sure you are buying non ethanol fuel, and most of us try to avoid it.
However if you just buy a gallon or so at a time you end up with whatever the customer before you bought.
I never knew this until it was pointed out to me at a service school.
The gas pump is usually some distance from the gas nozzle and that's where the change over takes place.
Just something to make note of.
Regards Chris

[POSTON WIDEHEAD]

Its all good Scott. They ride me like a rented Mule.  >:(

[Kbeitz]

Spark plugs should run a light tan.

[LeeB]

You can't ride a goat. Sometimes you can train them to pull a wagon though.  Just don't get too close to them when they start 'backfiring'.

[Jim_Rogers]

Spark plugs should run a light tan.

thanks

[bkaimwood]

Jim R...happy someone read in detail, and took in what I wrote... Kbeitz beat me too it...tan, light brown OK...clean, too lean, black, too rich. I mean this respectfully to all, but it bothers me, so I hafta say...the cause/causes of this concern has already been listed here... Despite this useful information, why still focus on how long it has to idle before shut down in order to have it shut down as it should, without having to mask a concern? It is true and good practice to let any engine just off heavy load to return to idle, and settle down idling before shut down...but we shouldn't have to worry about whether or not it will actually shut off, or scare the dog into a heart attack...there should be no need for a timer. Every concern has a remedy...

[Kbeitz]

...............



 

[bkaimwood]

Can always count on you, Kbeitz, for the detailed pics...I prefer to see a strong #11, but not a #10...IMO, a 12 is OK on a liquid cooled engine, but would prefer not to see that lean on air cooled...

[booman]

Try shutting it down at about 1/2 throttle.  The  newer engines should have a solenoid that shuts of the gas to the high speed jet on shutdown.   This works on my LT15 with the 25 hp Kohler and my riding lawnmower with a 27 hp Kawasaki.

[bkaimwood]

Try shutting it down at about 1/2 throttle.  The  newer engines should have a solenoid that shuts of the gas to the high speed jet on shutdown.   This works on my LT15 with the 25 hp Kohler and my riding lawnmower with a 27 hp Kawasaki.

You're killing me...

[tnsnakebite]

booman is spot on with this. Read your Kohler manual.

[Chuck White]

Welcome to the Forestry Forum, booman.

My mill has the 25hp Kohler and it's always struck me funny when I shut down because the engine will continue to run as normal for about 15-20 seconds after I turn the key off!

[Jeff]

bkaimwood, please don't insinuate that others are giving bum advice unless you have this engine in this configuration and know what the "true" fix is.  It could be, the fix is exactly what they say know matter what you personally think.

[glassman_48]

Scott,
I have a 38 hp kohler on a firewood processor that was built in 2012, I had the same problem.  I went from regular gas to premium, then went to the recreational gas without ethanol.  My local chainsaw shop also sold me a fuel additive that was for gas with ethanol in it.  I have heard good and bad things about the fuel additive too.  With the recreational gas if I use at least a couple of tanks full my dieseling/farting problem gets better.  Hope that helps.

[timberjackrob]

I have a 18hp kohler on lt 28 never experienced any diesling but have had occasional backfire.have you tried any additives in your gas I run some chevron injector cleaner thru mine on occasion.dont know if this helps it or not.i have also been using some lucas additive for protection from ethanol if the mill is not gonna be used for awhile.

[bkaimwood]

10-4 Jeff...glad you put the "unless" in there...I apologize and don't mean to insinuate or offend anyone, truly looking to help. As I'm sure you noticed, I'm a fixer...when something doesn't function to expectation or as I would beleive its designed to function, I find out why. I was a diagnostician for 25 years, so its hard to let that go. I hate to see so many people have the same problem and have  to deal with it in ways I consider non conventional. You mentioned, in so many words, to soften my voice unless I knew what the true fix was, and had the mentioned Kohler engine, or something close to that...I do have a Kohler, and have had several over the years, and as mentioned, when I had listed issues it was always idle to high or lean fuel mixture...neither here nor there. I am only looking to help and guide as so many others here have done for me. For that, I am grateful. If anyone close to me has a mill with this problem, feel free to post or pm me...I would love to get my hands on one of these things...I would perform a diagnostic session in order to find the root cause, and repair it, in effort to help the dozens of owners on here with this issue...I'm sure the number is much higher...it goes without saying that this would be free of charge...thanks for listening, and again, by no means was I looking to offend anyone, just looking to motivate someone to entertain the idea that this is not normal.