Rolled my Tractor and it blew up ???

[dfkrug]

as for why? easy to spin engine over before letting it labor with compression. ie.. oil pump.. etc..

Of course, that is what compression release is for...ease of cranking
when starting. But clearly the small sub 2-liter diesels in tractors have
pretty much done away with them. They are not necessary. Even at
22:1 compression ratio, a conventional automotive starter and battery
have no problem cranking these engines. Bigger engines are a different
story, and CR, as well as pony motors, gasoline start, pneumatic start,
etc are ways to address that issue.

I remember in the 70s when the makers of larger displacement m/cs went
to electric start. They usually kept their kick starters for a while, even
though they became obsolete. Many conservative folks were apalled
when the kick starter got deleted. I suppose that also applied to the
crank starters on really old cars, too.

Compression release as an emergency shut-down? Great if you have it.

 

[Soundguy]

Of course, that is what compression release is for...ease of cranking
when starting. But clearly the small sub 2-liter diesels in tractors have
pretty much done away with them. They are not necessary.

I've talked to alot of jinma owners that would argue that point with you..

on a slightly related note.. I'm glad my JD-B has comp releases.. makes for easier starting.. same with the 5' bar shtil (sp? ) chainsaw.. comp release is a godsend..

soundguy

 

[DiezNutz]

Just discovered this is a duplicate thread.

For those that don't frequent the Kubota forums and just can't get enough of this discussion here's the link:
http://www.tractorbynet.com/forums/kubota-owning-operating/179496-rolled-my-3240-ran-till.html

Yes, little doubt it was ingesting engine oil through the breather tube.

 

[dfkrug]

I've talked to alot of jinma owners that would argue that point with you..

Chris' Jinma was noted above. 98% of sub-2L CUTs without CR = pretty
much done away with to me. Any Jinma owners want to argue that?

Alas, no electic start on chainsaws (most of them!), so even my wimpy
45cc Husky has compression release.

 

[Soundguy]

Chris' Jinma was noted above. 98% of sub-2L CUTs without CR = pretty
much done away with to me. Any Jinma owners want to argue that?

Alas, no electic start on chainsaws (most of them!), so even my wimpy
45cc Husky has compression release.

My point was about the necescity.

for anyone that has one and needs to use it.. they probably fell it is necescarry..

soundguy

 

[dj882000]

We are fortunate to have you still here! Check into your homeowner`s insurance...my Dad had a tractor that burned up and it was covered... just a thought.

 

[Sysop]

After three years I'm sure he's got something figured out.

Welcome to TBN dj882000!

 

[Shamus M]

After three years I'm sure he's got something figured out.

Welcome to TBN dj882000!

Yessir. I'm sure he installed a air intake kill so that he can roll his tractor with confidence that it won't runaway anymore.

 

[TnAndy]

Well it appears I'm very lucky in more ways than one......

Went out this morning and replaced all the fuses I pulled last night, I added about 3 quarts of oil, this got it back up in the operating range, I was thinking about pulling the injectors as some had suggested but after awhile I decided to see if it would turn over, I hit the starter and it fired up just like always..... no smoke, no unusual noises..... I went to town and picked up some more Rotella Syn. and came home and changed the oil and filter, degreased the front of the tractor where all the oil blew out and power washed it, there was a small amount of oil on both the inner and outer air filters so I'll replace them.

It appears the engine is OK, the only explanation to this is indeed it had to be running on it's own oil and once the oil got low enough that it quit running into the cylinders (or out the vent line)the tractor quit, there was still a couple quarts of oil scattered throughout the engine so I guess this protected it.

I'm guessing the crankcase vent line is run into the intake air and the oil came through the vent line into the intake (the reason I have oil on my air filters) and was sucked into the engine that way, I don't think it blew past the rings, it had to come through the crankcase vent into the air intake, I may look at rerouting this as well.

I don't think a fire extinguisher is the answer to a runaway engine, the only real solution to prevent this from happening is an emergency air kill which I will be adding as soon as I locate one.

This may never happen again (I hope not) but the next time it does I will have a switch or handle to shut the air off.

Thanks for everyones comments and suggestions, I'll post back and start another topic when I locate an air kill.

Steve

Had the same thing happen on an 8hp diesel I have on a Lombardini diesel on a garden tiller. Fuel seeped into the crankcase over the winter ( is my guess ) and after firing up for the first time in the spring, it ran away. Didn't know what it was either, so all I could do was back off and let it rip....which it did to the turn of 5-10,000 rpm ( who knows....it was screaming ! ).

Anyway, finally ran out of excess crankcase oil/fuel......I changed oil in it, fired it up and it's run for years now......but you better believe I check the oil level each and every time !

 

[PhysAssist]

Yessir. I'm sure he installed a air intake kill so that he can roll his tractor with confidence that it won't runaway anymore.

His point was that the thread is an old one and was last posted on in 2010; until yesterday anyway, and the posters didn't seem to be aware of that based on their responses to the OP.

Thomas