Will a 9n motor fit a 8n tractor?

4x4 crew

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I have a 9n that runs great, but I dont care for the high grearing or the heal pedals.

I may be able to get an 8n that the motor is bad in and was wondering if I could swap the 9n motor onto the 8n tractor to get the lower gearing and 8n pedal setup?
 
Any and ALL 'N' engines fit the entire Mfg., good idea. In order to get a "better" gearing " setup you will find that "The 9N & 2N have 3 forward gears and the 8N has 4". Find John Smith's site for the best info.
 
They are a direct swap.
I did the same thing about 12 years ago - put a 2N engine engine into an 8N.
But if you don't like the gears in a 9N you will hate the gears in an 8N.
8N reverse is rediculous fast.
 

I am more worried about the lowest forward gear. I am under the impression that an 8n is lower than a 9n in 1st low. Is that not correct?
 
As far as I know,the two machines have the same
ratio at the rear-end,just different trannies. lha
 
(quoted from post at 18:00:52 10/29/14)
I am more worried about the lowest forward gear. I am under the impression that an 8n is lower than a 9n in 1st low. Is that not correct?
N/2N/8N first & second gear ratios are the same.
 
(quoted from post at 14:44:00 10/29/14) I have a 9n that runs great, but I dont care for the high grearing or the heal pedals.

I may be able to get an 8n that the motor is bad in and was wondering if I could swap the 9n motor onto the 8n tractor to get the lower gearing and 8n pedal setup?
The 3 speed first gear is 1.79 mph at 1000rpm and the four speed is 1.85 mph at 1000 rpm so you actually have a slower gear in the three speed.

Mark
 
(quoted from post at 18:53:16 10/29/14)
(quoted from post at 14:44:00 10/29/14) I have a 9n that runs great, but I dont care for the high grearing or the heal pedals.

I may be able to get an 8n that the motor is bad in and was wondering if I could swap the 9n motor onto the 8n tractor to get the lower gearing and 8n pedal setup?
The 3 speed first gear is 1.79;1 and the four speed is 1.85;1 so you actually have a slower gear in the three speed.

Mark
ark. Better revisit those numbers.
 
You would need to retain the 8N governor, to connect up to the linkage on the tractor.

And, of course, if the 8N is a late unit with side-mount distributor there would be a difference in the ignition wiring, generator location, and voltage regulator or cutout used.
 


..."8N reverse is ridiculous fast."...

Amen to that. Try to do some box-blade work going backwards. Gets up to about 50 mph...or so it feels like...lol Always wondered if that was supposed to be a backwards road gear like the opening scene in "smokey and the bandit" movie where Burt Reynolds was going backwards in the pickup down the highway and passing people.
 
(quoted from post at 18:49:51 10/29/14)
(quoted from post at 18:00:52 10/29/14)
I am more worried about the lowest forward gear. I am under the impression that an 8n is lower than a 9n in 1st low. Is that not correct?
N/2N/8N first & second gear ratios are the same.
I was planning to measure those numbers on my 9N and 8N this year.
I have yet to find a reliable tach setup to run the test to my satisfaction.
However, driving the two my "feeling" is that the 8N ground speed is faster.
JMOR has told me before that the gear ratios are the same and I
do not doubt him. Maybe the Sherman in my 9N affects the feel.

The engine will swap and if it is a front mount 8N and you have
both complete tractors you should have all the parts to do it.
I wouldn't expect it to be any slower though.
 
(quoted from post at 00:48:44 10/30/14)
(quoted from post at 18:49:51 10/29/14)
(quoted from post at 18:00:52 10/29/14)
I am more worried about the lowest forward gear. I am under the impression that an 8n is lower than a 9n in 1st low. Is that not correct?
N/2N/8N first & second gear ratios are the same.
I was planning to measure those numbers on my 9N and 8N this year.
I have yet to find a reliable tach setup to run the test to my satisfaction.
However, driving the two my "feeling" is that the 8N ground speed is faster.
JMOR has told me before that the gear ratios are the same and I
do not doubt him. Maybe the Sherman in my 9N affects the feel.

The engine will swap and if it is a front mount 8N and you have
both complete tractors you should have all the parts to do it.
I wouldn't expect it to be any slower though.

"JMOR has told me before that the gear ratios are the same and I
do not doubt him."
........and I appreciate that . JMOR very, very rarely post something as fact if he can't back it up. If anything less than certain, I insert something like 'I believe' or 'to the best of my knowledge', etc.

To repeat, "first and second gearratios in 9N/2N, 8N, NAA are absolutely IDENTICAL". No measuring uncertainties, just count gear teeth.

 
Well thanks for everyone's input. If the ground speed in 1st low is going to be the same I dont think I will bother with the swap.

I may still look into getting the 8n for parts or a future rebuild though.

Thanks again eveyone!
 
Aside from the dumb reverse, 8Ns Are worth having over a 9/2N.
They have both draft and position control.
They have both brakes on the right side.
And they have a real drawbar.
 

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