MX5200 Engine Problem

rabcon · Feb 3, 2015

Well today It was -8 degs. And I was letting the tactor to run to warm up the Hydo. Started it and was set at a idele and went back in the garage. In about 10 min. I could hear something strange, I opened the door and all I saw was smoke and the tractor was screaming . I went to the tractor and the tack was pinned at 3000rpms. Humm Did not want to shut the key off at that RPM's being a trobo charged motor. Didn't know what to do . Finaly it stalled and was knocking really bad. . I called the dealer and spoke to a service rep and I was told It was running on the crank base engine oil being pumped through the trobo charger.I guess shut down because it hydo locked from the oil being pumped on top of the pistons. Well checked the engine oil after things settled down and there was no oil on the dip stick and the ground was covered with oil that was blowing out the muffler. 126 hrs. on the tractor and was bought on 7/2014. .... The Dealer was here within 1 hr. with my old 5030 as a loaner. Now just waiting to see what the damages are. The problem is that the crank vent was frozen I was told.

dodge man · Feb 3, 2015

Hate to say it, but it sounds expensive to me. Might need the engine rebuilt or replaced. Still under warranty?

rabcon · Feb 3, 2015

Yes it is !!

rbargeron · Feb 3, 2015

rabcon said:
Well today It was -8 degs. And I was letting the tactor to run to warm up the Hydo. Started it and was set at a idele and went back in the garage. In about 10 min. I could hear something strange, I opened the door and all I saw was smoke and the tractor was screaming . I went to the tractor and the tack was pinned at 3000rpms. Humm Did not want to shut the key off at that RPM's being a trobo charged motor. Didn't know what to do . Finaly it stalled and was knocking really bad. . I called the dealer and spoke to a service rep and I was told It was running on the crank base engine oil being pumped through the trobo charger.I guess shut down because it hydo locked from the oil being pumped on top of the pistons. Well checked the engine oil after things settled down and there was no oil on the dip stick and the ground was covered with oil that was blowing out the muffler. 126 hrs. on the tractor and was bought on 7/2014. .... The Dealer was here within 1 hr. with my old 5030 as a loaner. Now just waiting to see what the damages are. The problem is that the crank vent was frozen I was told.

Wow - talk about a spectacular engine "dismount". Old worn-out diesels (not new ones like this) sometimes run away on crankcase oil - but by scavenging it up around the worn rings, not from having it pumped in by the turbo. Sounds like something in the turbo failed, allowing pressurized engine oil to leak into the airflow to the engine. The engine may be junk now. Can't quite visualize how a plugged crankcase vent would set off this disaster. BTW, if it was running away on engine oil, turning off the key switch might not have saved it - might have kept going.

oosik · Feb 3, 2015

Frightening situation. Thank goodness its covered by warrantee & what sounds like a very responsive dealer.

coobie · Feb 3, 2015

YIKES,glad you have a warranty.Hope all goes well.

stoyan79 · Feb 3, 2015

Yeah, I bet if you turned the key to off, it would have not stopped it, I think a runaway can be only stopped by plugging the air intake.

TomSeller · Feb 4, 2015

Glad you have a good dealer and the MX is under warranty. Sounds like a fluke situation. Better now than after warranty. Very odd for a Kubota.

AKfish · Feb 4, 2015

Well.. I guess all those stories about "runaway diesels" is the real deal! Sorry to hear you had the one to have that experience!

I honestly, don't think I would be able to choke off the air quickly enough to save the engine on any of my diesel tractors, though. The huge, double filter air cleaner assemblies... About the only thing a guy might do would be to wrap a big garbage bag over the whole assembly.

But... If you finally got the motor shut down and found out that it only had a 1/2 or maybe only a quart of oil left... might just be better off to replace the whole engine, anyway.

Thank God, you're still under warranty!

AKfish

rabcon · Feb 4, 2015

After reading up on Runaway's , The shuting down the intake is the Key !! But get to the intake would of been the isue with the loader being down and the hood closed and the screaming engine !!! It all happened in a couple of min.