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Another 646 Repower


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#1 Case-Closed OFFLINE  

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Posted December 17, 2017 - 06:58 PM

Winter is here in Helena Mt. and I figure it's time to get on with the winter project. Last winter I picked up another 646 up the road in Great Falls Mt. After rebuilding the rear end and the front end I figure it's time to remedy the smoking Onan under the hood. My last 646 repower was done using an 18 hp Kohler V-twin so I have chosen to use the same engine again. Everything on this tractor works well so the swap out should be easier to do than the last one. Unfortunately this tractor is not complete and some 3 point fabrication as well as new hoses will be needed. I will attempt to do a better job of documenting this process and posting the pics.

 

1217171611_HDR.jpg 1217171612a_HDR.jpg

 

1217171612b_Burst03.jpg 1217171612b_HDR.jpg

 

1217171612_HDR.jpg


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#2 secondtry ONLINE  

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Posted December 17, 2017 - 08:18 PM

From what i can see that is there it makes a complete three point fabrication seem trivial. Nice tractor  Don


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#3 Mark 149 J. ONLINE  

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Posted December 17, 2017 - 11:17 PM

Nice tractor!

I would love to find a 646 like that one!  I've never owned one but every time I see one they look to be well built.  I would to find one and put a diesel motor in it.


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#4 Case-Closed OFFLINE  

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Posted December 18, 2017 - 08:50 PM

I considered a Z482 Kubota diesel for a while but I live in a place that commonly hits 30 below zero and diesel engines dont like that a whole lot. My other 646 has a Kohler V-twin I stuffed in it a few years ago. Starts easily anytime, while my KE-70 diesel in the Suzue 150 is a bugger to start. One other problem, diesels are pricey, even used ones, and most don't come with a flywheel, bell housing or a pump drive which adds several hundred dollars to the cost of a used engine with an unknown past.IMG_0886.JPG


Edited by Case-Closed, December 18, 2017 - 08:52 PM.

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#5 Case-Closed OFFLINE  

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Posted December 20, 2017 - 10:28 PM

Got home from work tonight to find this big crate on my front porch.

 

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It was too big for me to drag into the shop with a foot of snow on the ground so I used the operational Case 646. The crate contained the new Kohler twin that is going into my dead 646. The engine and tractor are now getting to know each other before the procedure begins.

 

1220171832_HDR.jpg   1220171839_HDR.jpg


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#6 Mark 149 J. ONLINE  

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Posted December 20, 2017 - 10:30 PM

Got home from work tonight to find this big crate on my front porch.

 

attachicon.gif1220171812_HDR.jpg

 

 

It was too big for me to drag into the shop with a foot of snow on the ground so I used the operational Case 646. The crate contained the new Kohler twin that is going into my dead 646. The engine and tractor are now getting to know each other before the procedure begins.

 

attachicon.gif1220171832_HDR.jpg  attachicon.gif1220171839_HDR.jpg

Christmas came early!


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#7 Case-Closed OFFLINE  

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Posted December 26, 2017 - 07:38 PM

I got a chance to tear into the dead 646 over the weekend and here's the proof. I got the party started with an oil drain by removing the plug in the travel control valve and cranking the engine with spark plugs removed and fuel lines plugged. Once the oil was gone I proceeded to pull off anything that might get in the way.

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Next I removed the oil tank trying not to make a mess with the residual oil in the tank and yes I got it all over the floor. After that came the cooler and tank supports.

 

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The fuel line got clamped off, wires removed, choke, throttle, fuel pump vacuum and clutch contols followed. I marked the frame with a paint stick to indicate the location of the front pully just in case I decide to use the stub shaft to drive a mower.

 

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There are four bolts holding the engine to the frame and four more the pump mount to the engine. Onan's are heavy pigs and extraction is best done with a cherry picker and a chunk of chain.

 

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I have a lot of grease removal to tend to and also a steering pawl bushing to install and my bucket control valve is leaking. With a little luck she will be ready to work in the spring.

 

 

 

 


Edited by Case-Closed, December 26, 2017 - 07:45 PM.

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#8 Cat385B ONLINE  

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Posted December 26, 2017 - 11:09 PM

How much does a crate CH620 go for nowadays? Looks like my local market is about to be flooded with them for nowhere close to retail:
https://www.k-bid.com/auction/22832
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#9 Case-Closed OFFLINE  

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Posted December 27, 2017 - 12:28 AM

I gave up 900 bones and another 100 for shipping


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