I've seen a WD9 show tractor re-engined with a Detroit 4-71. No reason a 6V-71 cannot be similarly shoehorned in. There's however several considerations with a 6V-71 in a WD9:

1 - The OEM engine is rated about 46 HP. The 6V-71 is good for 238 HP in stock form. Would not be an issue for a show tractor. However for a working tractor getting that much power to the ground thru a WD9 transmission/rear end will tear it up in short order.

2 - The WD9 engine is governed to 1,500 RPM; the 6V-71 runs best at it's governed 2,100 RPM. Means in a WD9, a 6V-71 repower is gonna be 40% faster in every gear. (Would be at once scary and fun in road gear!)

3 - And of course in a working tractor there will be the NOISE of the 6V-71!
 
Believe early on the w9 rear end was used in pulling tractors.

Since my WR9 runs about 23 mph at speed, with the Detroit it would be running about 32. Rather scary!
 
anything can be done with money, but the tractor will not hold up to that horse power. the wd9 had weak bull pinion brgs. as it was. if i was doing it i would use the 660 tractor. and that would not be the best transplant either. but ok for show.
 
Well it would be for show alright, tractor pulling. No serious competition. I have 4 WD9 donor tractors. I also have a 506 IH that needs a head gasket maybe that would be better for the Detroit. The Detroit is just sitting in my garage though I would do something with it. Also have the auto trans to go with it. Tranny is new came out of Greyhound bus.

Curt
(like I don't have enough projects with 17 tractors) LOL
 
(quoted from post at 16:49:59 09/20/16) anything can be done with money, but the tractor will not hold up to that horse power. the wd9 had weak bull pinion brgs. as it was. if i was doing it i would use the 660 tractor. and that would not be the best transplant either. but ok for show.

I agree about the bull pinion bearings. They are the achilles heal of the WD-9 transmission. The Super WD-9, 600, & 650 was preferred by some people for pullers due to the improved bull pinion bearings. Those failed too when used for pulling.
 
(quoted from post at 18:53:45 09/20/16)
(quoted from post at 16:49:59 09/20/16) anything can be done with money, but the tractor will not hold up to that horse power. the wd9 had weak bull pinion brgs. as it was. if i was doing it i would use the 660 tractor. and that would not be the best transplant either. but ok for show.

I agree about the bull pinion bearings. They are the achilles heal of the WD-9 transmission. The Super WD-9, 600, & 650 was preferred by some people for pullers due to the improved bull pinion bearings. Those failed too when used for pulling.

So you are saying while I have the bull gear off the axle I should replace the bearings as PM?
 
So you are saying while I have the bull gear off the axle I should replace the bearings as PM?

If the bearings on your bull pinions are in good condition, replacing them is probably a waste of money. It's really a weak spot in the design and old versus new doesn't make much difference. If your tractor is not being used for hard drawbar work then they will likely never fail if the bearings are in good condition.

I had one fail on my Super WD-9 many years ago. The left one failed while pulling a 5-14 plow. Apparently it was somewhat common for this to happen to the furrow wheel (left) pinion bearing. The real damage came from the bearing debris getting caught between the pinion gear and the bull gear. There are other factors worth mentioning. The tractor had 11700 hours at the time and l am almost certain it was the original transmission oil. If the tractor would have had the transmission oil changed a couple of times in it's life then maybe the bearings would not have failed. We religiously changed oil in the engines on our equipment and almost never changed any of the other fluids unless driven by failure. Older & wiser now--well older anyway.
 

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