646 repower

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Harry United States of America
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646 repower

Post by Harry »

Today I pulled the tired Onan from the 646 loader GT. I have the Honda replacement engine ready to go in. I’ll have to fabricate a attachment plate to bolt to the frame and engine to plate. I also will have to plumb up the hydraulic pump to existing lines where old pump is now. Engine runs great and as most Hondas starts right up. :peace: Harry
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Onan CCKA coming out of 646
Onan CCKA coming out of 646
Empty engine bay
Empty engine bay
Honda 20 hp replacement engine
Honda 20 hp replacement engine
Rear of Honda with Eaton hydraulic pump
Rear of Honda with Eaton hydraulic pump
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Eugen Canada
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Re: 646 repower

Post by Eugen »

Interesting project @Harry , looking forward to it! :highfive:
Case 224, 444, 644, 680E
Kubota B26 :blush:
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Timj United States of America
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Re: 646 repower

Post by Timj »

Nice project Harry, that Honda should be a good power plant for you. :highfive:
:446cart: let's go, it's finally time to blow. :peace:
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Harry United States of America
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Re: 646 repower

Post by Harry »

Today a friend brought over a lovejoy coupler that fit the engine crank and the hydro pump. All buttoned up and ready to make engine mount adapter plate and fit engine in the GT. :peace: Harry
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C0437187-0BE9-492B-8F5B-60CF3939C88E.jpeg
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Harry United States of America
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Re: 646 repower

Post by Harry »

Today I cleaned by more parts and carefully put the engine in the tractor. Connected the hydraulic line to hydraulic pump. Took some measurement’s and cut all the metal, 1/4” plate to fabricate the engine mount to tractor frame connection. :peace: Harry
Attachments
Setting in tractor, plenty of room for oil tank in original location.
Setting in tractor, plenty of room for oil tank in original location.
Hydraulic line connected, plenty of room for battery in top of tower.
Hydraulic line connected, plenty of room for battery in top of tower.
Exhaust will be on right side and drop down to ground.
Exhaust will be on right side and drop down to ground.
Looks like battery to exhaust is good. Will make heat shield in front of battery and wrap exhaust with header wrap.
Looks like battery to exhaust is good. Will make heat shield in front of battery and wrap exhaust with header wrap.
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Eugen Canada
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Re: 646 repower

Post by Eugen »

That is a nice fit Harry. When I wanted to repower my old 644 with a Honda clone it didn't seem to fit very well, so I went back to a K321. But yours looks good! :thumbsup:
Case 224, 444, 644, 680E
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Re: 646 repower

Post by DavidBarkey »

Looking good Harry . On the 446s there is a air baffle/ heat shield on the back of the motor . Does the 646 have the same thing?
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Harry United States of America
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Re: 646 repower

Post by Harry »

Eugen wrote: Sat Apr 08, 2023 11:34 pm That is a nice fit Harry. When I wanted to repower my old 644 with a Honda clone it didn't seem to fit very well, so I went back to a K321. But yours looks good! :thumbsup:
Eugen, the 600 series have more room than the 400 series does. :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Harry United States of America
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Re: 646 repower

Post by Harry »

DavidBarkey wrote: Sun Apr 09, 2023 6:25 am Looking good Harry . On the 446s there is a air baffle/ heat shield on the back of the motor . Does the 646 have the same thing?
David, the 600 series does have a heat shield on the onan CCKA engine, which dies not work for the Honda. I still have a few things to work out yet. I kept waking up last night thinking about the engine transplant. I hate when that happens. :pullhair: :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Re: 646 repower

Post by Jancoe »

Harry,
Best to have a notepad next to the bed for times like this.
The transplant is looking good. I like what i see. I know you said before you had these motors sitting on a shelf. I really like honda motors and if I were to replace any of my onan tractors I'd want to do it to my 6018bh. Running that backhoe for awhile at times is earmuffs loud and not efficient with fuel.

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