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bob
07-19-2006, 09:57 PM
The Daihatsu Turbo-Diesel engine on my Gravely 272z blew apart today. It has 597 well maintaned hours on it. Its also out of warrenty. I remember reading some posts about a problem that some of these engines had. I did a search, but couldn't find the exact posts. Does anyone remember the engine problem?

coyotekid
07-19-2006, 10:15 PM
Was it ever overheated, even once?! The Kubota and Daihatsu small 3 cylinder diesels are extremely sensitive to being overheated, as you may already know.

My Kubota was overheated once...and not that severely. It was enough to warp the head, make the engine start drinking coolant, and subsequently ruin all the internal bearings.

I had an Exmark engineer agree with me recently...he said both were great engines but VERY sensitive to overheating. Keep those screens clean...

tomo
07-20-2006, 06:49 AM
hello, big end bearing problems, on a turbo version,threw a conrod from memoryor very noisey [knocking b/end] . Do a number of different searches and you will find although not in the obvious places from memory.From my previous career some engines are more suseptable to b/end failure than others and occures mostly on highly stressed engines [turbo/high load]on engines that were not designed to be pushed to that level. This of course arises well b4 you expect eg low hrs/mileage.The diahatsu engine [only from what i have read] runs 14psi boost.I personally would think this is to high considering engine runs no intercooler. As toyota owns diahatsu i personally expect the engine to last a long time[toyota produce many t/diesel eng]On the topic of o/heating all engines are sensitive to coolant loss and there fore engine damage . I would suggest the fitting of a temp operated alarm or fuel cut off as done on heavy earthmoving equipment.Overheating is the biggest killer of engines PERIOD!!!!!!! Overheating severly shortens the life of eng parts particularly if it causes cracked heads etc . What about the rings??If a over heating is caught early enough you will have no problem. PS buy yourself a radiator pressure tester and pressure test cooling system at every service to makers spec .Basic mower maintenance still applies ,keep the radiator clean etc etc . any questions please post thanks tomo