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post #1 of 17 Old 11-03-2009 Thread Starter
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universal M25 issues B I G

Hello all. We got the engine out and on a stand (yea!) but I have 1 issue that I fear will be a big one...

The engine spent about a year with fresh water covering the lower 1/2 of the engine. Some in the oil pan. well good news is that I tore it down and the water never got as high as the crank!

Bad news is that the flywheel bolts were a PIA and one snapped and three chewed the threads with only one having come out normally.

My question if any one here knows is can I chase the threads on thouse bad bolts and get by or timecert them oversize?

I have what is a 423hr or 1423 hour engine here that turns freely and looks good.

Thank you

Josh
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post #2 of 17 Old 11-03-2009
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Can you drill out the one that snapped and retap the threads?
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post #3 of 17 Old 11-03-2009
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I would clean up the threads and install new bolts and see if you can get it up to the specified torque when you put it back together. If it does, you're done. If it strips out the holes, you're back to plan b.

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Boating for over 25 years, some of them successfully.
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post #4 of 17 Old 11-03-2009 Thread Starter
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It would be very easy to do plan b now and save the step. I wonder if I am in there is there anything I should look for? I would prefer not to pull the crank rods etc. It supposedly was finiky but the guy before me used it very little. Would a local tractor place be able to test the injectors? My other plan here was to rebuild the heat exchanger as I would not be surprized if it had issues with getting hot.


Josh
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post #5 of 17 Old 11-03-2009
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it's a kubota engine

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #6 of 17 Old 11-03-2009
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Unless the threads look mighty good, I'd tap and re-thread. You have it out on a stand, it'll never be easier. Even if you manage to get them to torque to spec, if it's weak at all, it'll be that much closer to failure.
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post #7 of 17 Old 01-08-2010
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Take it to the local shop and let them remove the old bolts and if necessary put inserts in to fit the oem correct bolts. Make sure they are torqued to the correct specs and the right locking devices are in place. Having a flywheel come off is not a good thing!
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post #8 of 17 Old 01-25-2010
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Your M25 (not the M25XP) is a Kubota D850-B engine. Your local Kubota shop can easily help you with cleaning and testing the injectors. New injectors from Kubota also are not than expensive. You could probaly only change the injector needles if you are handy, which it seems you are...Just a thought.
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post #9 of 17 Old 01-25-2010
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Go to your local Auto Parts Store and look at his assortment of "Heli Coils".

They are made for repairing damaged threads and if your talents and tools are up to it they do a can do a job that in many cases is better than new without changing bolt sizes.

Alternatively let a machine shop do it. No biggie.
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post #10 of 17 Old 01-29-2010 Thread Starter
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Just and FYI in regards to the 414 hour engine.

She Purrr's like a kitten! I hellicoiled 4 of 5 bolts with grade 8 or some such. All torqued fine and its being a low rpm engine of more HP/torque than I will ever need in a 30' boat I think we are fine. The injectors were also fine I took them out and turned them 180 deg to clear the engine and cranked it e few times and the spray pattern looked good and even. I then put on my NEW $89 chinese starter and added fresh deisel and WAM! started first go @ idle no less!!!

Very happy $1000 1985 Cat TR owner....Cushions are now recovered and the head rebuilt.....soon to dig into plumbing and electrical.

I love to sail, coming from a Swordboat capt's loin one would think I'd of caught the bug long before now! Oh well, this ones for you Bisque...(My Father may he RIP)

Now If I could only stay away from working on the damn things I could sail more!
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