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Case 646 Repower

case 646 repower kohler

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#1 Case-Closed OFFLINE  

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Posted October 24, 2013 - 09:17 PM

After being followed home by a ratty old 646 in August I am about ready to begin it's reassembly. I have been trying to remember to take pics as I go so here they are. The previous repower was a 16 Hp Briggs with a vertical shaft and all I can say is it was a bad choice. With no space under the hood the battery was left sliding around on the floor board. This engine also had a dead clyinder so it really did have to go. The new engine is a Kohler CH 18 that I got for a good buy. Everything has been fit and refit and I think the final assembly is at hand.

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Edited by Case-Closed, October 25, 2013 - 12:25 AM.

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#2 JDBrian OFFLINE  

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Posted October 25, 2013 - 05:09 AM

That engine looks 1000% better in that 646 than the Briggs! Be sure to keep posting pics of your progress.


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#3 Case-Closed OFFLINE  

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Posted October 25, 2013 - 07:18 PM

Well I made a little progress today on the 646 and the puzzle is starting to take shape. The first pic is of the motor mount and oil cooler installed. The engine sits with the pump forward just I have seen done by many others with the oil cooler mounted near the back of the engine compartment. It's a tough deal to make everything fit but it can be done. For vibration reduction the engine sits on a quarter inch thick rubber pad. Tomorrow I hope to mount my new oil lines and a new filter on the return side.

 

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#4 Mjoe7 OFFLINE  

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Posted October 30, 2013 - 01:15 AM

I know a guy that has nice reproduction dash tower panels for sale if your missing yours.

That repower looks great! WAAAAAY better than that Briggs.

Nice job!


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#5 Case-Closed OFFLINE  

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Posted November 02, 2013 - 06:42 PM

I managed to get in a nearly solid undisturbed day working on the 646 repower. I got the muffler and supports put together, I used an ATV muffler rated for 600cc because I want this tractor to be a whole lot quiter than my 444. The hydraulics have also been fitted and I need to do their final installation in the next few days. I hope to get some paint on newly welded parts before the real cold weather gets here and then do a final assembly of this jigsaw puzzle.

 

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#6 Case-Closed OFFLINE  

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Posted November 12, 2013 - 06:49 PM

As of today the 646 is up and running, I still have work to do in order to make her a reliable rig but most of this is small stuff. Pics will be posted soon.



#7 Mjoe7 OFFLINE  

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Posted November 13, 2013 - 03:20 AM

Sweet!!! :rocker:


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#8 Cvans ONLINE  

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Posted November 13, 2013 - 11:35 AM

You do nice work and that is really looking good. 


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#9 Case-Closed OFFLINE  

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Posted November 14, 2013 - 07:05 PM

It runs!!! But!! I seem to have a hydraulic issue and I think it might just be the pump. It came with a Rexroth S16S5AH26R and I find no reference to that anywhere in the case world. I have learned that this pump is 2.9 GPM and that sounds a bit low to me. Does anyone out there know what pump should be in this tractor? I have heard that a 6296k63 from McMaster Carr is a direct replacement and puts out 4.52 GPM at 1000 PSI. I would really like to know if this is correct before I drop $200.00 on a pump.



#10 gopher OFFLINE  

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Posted November 14, 2013 - 09:52 PM

I think yours at 1000 psi should be 6.5 gpm. At 0 psi 3600 rpm. 8.5 gpm



#11 Case-Closed OFFLINE  

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Posted November 15, 2013 - 07:36 PM

I managed to find a replacement  pump and it is made by Eaton. I will be usinfg a 26004RZC rated at 10.3 GPM at 3000 RPM and 5.5 at 1800 RPM. The size and ports are Identical to the one I have and it's even made in USA. You can see in the pics how the pump mounts up and it took a mere 15 minutes to pull it.

 

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#12 Case-Closed OFFLINE  

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Posted November 21, 2013 - 01:56 PM

I recieved the new pump yesterday and installed it this morning. Everything was identical to the the old Rexroth so it bolted right up without a hitch. The difference in performance is astounding. I thought I might see a bit of difference with the new pump but instead it's huge. The weather here calls for highs in the low teens  so rigerous testing will have to wait, as I don't like to freeze if I don't have too. I hope to wrap up this whole engine swap stuff and move on to adapting my sleeve hitch tiller to go on the 3-point on the 646. I suspect one of the triangle shaped adaptors I see all over the internet will easily adapt to suit my needs.

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Edited by Case-Closed, November 21, 2013 - 02:07 PM.

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#13 MH81 ONLINE  

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Posted November 23, 2013 - 12:52 AM

Glad the swap went well, looking forward to the full test report when better weather is there.
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#14 Cvans ONLINE  

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Posted November 23, 2013 - 12:59 AM

Isn't it nice when things turn out better than hoped for. Project turned out nice.  :thumbs:


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#15 gopher OFFLINE  

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Posted November 23, 2013 - 05:36 PM

Just curious with the vertical what did they use to cool the oil?







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