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Gunny357 
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Joined: 27 Aug 2018
Location: North Carolina
Points: 8
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 Topic: 616 engine swap
Posted: 27 Aug 2018 at 3:55pm |
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My old 616 is getting pretty tired. Engine starting to smoke and use a lot of oil, hour meter broke at 9980 hours back in 1998. Probably has well over 15,000 hours on it. Have a Kubota 3 cylinder diesel engine that looks like it might fit in there. The radiator might be a challenge but do able. Anyone else ever done this before? Ideas, comments, suggestions?
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4910
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Posted: 27 Aug 2018 at 8:07pm |
 Putting it In one of these?
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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mnoonan-NEWI
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Joined: 11 Sep 2009
Location: Marinette, WI
Points: 738
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Posted: 27 Aug 2018 at 8:27pm |
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Very nice looking 720!
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AC CA, Ferguson TO-20, Ford NAA, M-M BG, AC #3 Mower, SC Plow, PH Digger, AC 720's with Ark 700 loader & Brantly Backhoe, "Mini B" w/flathead Ford V8
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Tracy Martin TN
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Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10624
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Posted: 27 Aug 2018 at 8:49pm |
 Gunny357 wrote:
My old 616 is getting pretty tired. Engine starting to smoke and use a lot of oil, hour meter broke at 9980 hours back in 1998. Probably has well over 15,000 hours on it. Have a Kubota 3 cylinder diesel engine that looks like it might fit in there. The radiator might be a challenge but do able. Anyone else ever done this before? Ideas, comments, suggestions? |
If that engine lasted 15000 hrs, I would rebuild or find another one! Tracy
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No greater gift than healthy grandkids!
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talntedmrgreen
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Joined: 25 Jun 2013
Location: Caledonia, MI
Points: 477
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Posted: 28 Aug 2018 at 8:08am |
Tracy Martin TN wrote:
Gunny357 wrote:
My old 616 is getting pretty tired. Engine starting to smoke and use a lot of oil, hour meter broke at 9980 hours back in 1998. Probably has well over 15,000 hours on it. Have a Kubota 3 cylinder diesel engine that looks like it might fit in there. The radiator might be a challenge but do able. Anyone else ever done this before? Ideas, comments, suggestions? |
If that engine lasted 15000 hrs, I would rebuild or find another one! Tracy |
No kidding! I rarely hear of one over 2000 hours, and most hour meters quit within the first 1000hrs, it seems. I think there is an extra zero here 
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Patterson B1*B1/B1Forklift*B10*BigTen/B1Loader*B110*B208*B206*616*Homelite T16H/T8/T7/RM7E*Landlord/Loader/Trencher*Broadmoor717*Serf525*2110*7790*Legacy XL*Twin 20*Squire9*Squire6*JCPenny 494
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coggonobrien
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Joined: 14 Nov 2010
Location: Eastern Iowa
Points: 1819
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Posted: 28 Aug 2018 at 10:02am |
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There's a fellow that put a kubota 3 cylinder in his around here. I believe the engine rotated the opposite direction so they had to somewhere rework the hydro or its linkage as well as the ptos.
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Gunny357
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Joined: 27 Aug 2018
Location: North Carolina
Points: 8
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Posted: 28 Aug 2018 at 2:27pm |
AC720. That is a fine looking machine indeed!
Yes, mine looks like that but not near as nice. If that is a restore project, someone did a fine job.
Yes it has a lot of hours on it, Made in 1973. Man who I got it from used it commercially to cut grass and a push push blade to clean out his chick barns. Probably ran 2 hours a day, every day for him. Got a big break here, about 6 hours a week from early April until mid November. Just a couple of hours in the winter, if it snowed to push out the drive way.
Former owner would use air to clean it off after every use, change oil and filters every 100 hours and never abused it. It has never spent a night outside or been out in the rain. I'd rebuild the engine but oversized pistons for an Onan CCK are no longer available at a reasonable price. $120 each is not reasonable. so using tha Kubota diesel is looking like a good option. Not to mention that fuel pump and carburetor parts no longer available either.
Will have to verify engine rotation but could put that KUbota in pointed either way to get rotation correct. The Kubota is out of an Onan generator that suffered a stator winding failure, engine has under 600 hours on it. Do intend to do it right and make it look lie it left th factory with that engine, means I'll be doing some radiator modification to get that in there.
Any advice or suggestions are welcome.
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BrianC
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Joined: 16 Jun 2011
Location: New York
Points: 1619
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Posted: 28 Aug 2018 at 3:50pm |
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My hour meter died at 1286.9 hours. Can I get a new one, drop in replacement?
The oil pressure switch broke a few weeks ago, used one from a Ford 3000 tractor and 1/4 to 1/8 pipe reducer. Then the "HOT" light bulb went out.
Ordered a new air filter from Grainger. It is getting rare. Now I can't find it, it has to be here somewhere!
The hydro oil filter is dated 5/2013- but, but I just replaced it yesterday!
If my Onan bit the dust, I think I would re-power. That Onan is robust, but the fuel economy is the worst. Along with that is heat output. And with the 3.8gal tank, in about 2.5 hours I am out. It keeps surprising me with that and it is my #1 machine most likely to run out of gas. If I put in a diesel, I bet I still run it out of fuel per my usual practice. Then not so easy,
bleed the air out of the system time. That would not be fun.
Is it just me on that point?
Search the forums here, I recall someone extending the frame so a 3cyl could fit?
The front PTO pulley has to let the belt fit in that slot to the mule drive. If the new engine is longer, looks like trouble, at fwd and aft ends.
The re-power kits are about $2400 dollars. I wonder if the fuel efficiency is 50% better?
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4910
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Posted: 28 Aug 2018 at 9:52pm |
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Thanks Gunny, competed it about 6 years ago. Took it down to the frame, sandblasted just about everything. 11month project. She has around 1200 hours on the origional Onan. Back then, I really didn’t have issues getting parts, even Onan parts, but they were expensive. I replaced the hour meter only because it was weathered, but it still worked. I work her regularly, using the sickle mower along my property. Still runs well but I to wonder what will happen one day when she gives up the ghost. I hope that she can be rebuilt as I want to keep it origional. With that being said, there is a Honda 24 hp repower kit that doesn’t look too bad. Probably easier on fuel. But your diesel conversion is interesting, just can’t give you any advice on how to do it. My thought is it may have too much torque for the hydro so play it safe when flexing the diesel’s muscles.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4910
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Posted: 28 Aug 2018 at 9:58pm |
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Sandy Lake Implement and Jacks small engines had the parts I needed including the hour meter which is exactly the same as origional.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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