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Fordson N top speed (or lack of!)

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Roland

06-16-2002 20:59:34




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I have a 1942 model N with a 4.3mph low speed top gear. Is it feasable to improve speed by fitting just a high top gear or do I have to change the whole cluster? Allowing for size and weight of the components, is it a relatively straightfoward job to split the g/box on these models or do I need specialist knowledge? Thanks for any help received.




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Andrew from Aust.

06-17-2002 00:07:00




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 Re: Fordson N top speed (or lack of!) in reply to Roland, 06-16-2002 20:59:34  
Hello Roland,
I split my Fordson F-N "mix" (front end 1935 N back end model F) last year to fix a gearbox problem I inherited from the previous owner. He had made this tractor out of two wrecks bits but in haste had mixed a set of ploughing gears with the standard gears.(The result was a gearbox which only engaged reverse and second gears!) The whole operation (and gearbox) is pretty much straight forward. (I'm by no means as experienced as other guys out there!) I would think that to change from 4.3 to 7.5 shouldn't be a problem as long as you mate the right gears together so that they mesh correctly. Also so that they slide "into" one another properly. I assume you have a spare gearbox / parts supply?

When I split the tractor I made sure to pack the front axle so that the engine could not tip on the front trunnion. (Does that make sense? Check a service manual) Because of space limitations in my shed I actually worked in reverse to most manuals in that I blocked the gearbox end and wheeled the engine and front axle away on my trolley jack. It was still quite sturdy and safe.

I laid all the gears and numerous spares out on the workshop floor like a jigsaw puzzle and studied the manual and started counting gear teeth! I chose the best gears (some were chipped from impatient gear changes!). I also replaced a few bearings which were badly worn. I was surprised how cheap the bearings were considering their large size.
It made a gearbox that was a pleasure to use. The clutch in mine had been done previously and worked well but I would check out this at the same time.

Sorry for the two page essay!

Regards

Andrew

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Roland

06-17-2002 10:27:10




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 Re: Re: Fordson N top speed (or lack of!) in reply to Andrew from Aust., 06-17-2002 00:07:00  
No need to apologize for the essay Andrew, it's a big help! I assume once the engine etc is pulled foward out of the way I reach the g'box through the bellhousing rather than having to strip the diff? The existing 'box is fine, as is the clutch but the world stock of fuel will soon dry up unless I raise the gearing! I don't have a replacement cluster yet as I wanted to see how feasable the undertaking was.
The beast is fully registered now on an age related plate with free road tax and all for the sum of £25!
Thanks again for your help.
Roland

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nigelB

06-23-2002 23:29:15




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 Re: Re: Re: Fordson N top speed (or lack of!) in reply to Roland, 06-17-2002 10:27:10  
give us a mail if you have any probs roland ,il take some pics of some industrials for you my friend has some industrials inc a un restricted one? nigelB



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nigelB

06-20-2002 00:51:04




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 Re: Re: Re: Fordson N top speed (or lack of!) in reply to Roland, 06-17-2002 10:27:10  
Howdy quite a simple operation to get more speed as long as you have the parts? 4.3 to a 7.5 is a straight transplant through the middle,it helps if you are going green spot to green or red to red as the gear that runs through to the diff is different if you mix? also you will have to take out the pto drive to make room for a 7.5.and replace with a plate. then if you realy want to brake the sound barrier, change the crown gear and worm for a straight cut 11.1 instead of a 17.1,large wheels and tires like i did for a customer and you could reach 11.75mph. nigelB

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nigelB

06-20-2002 00:50:07




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 Re: Re: Re: Fordson N top speed (or lack of!) in reply to Roland, 06-17-2002 10:27:10  
Howdy quite a simple operation to get more speed as long as you have the parts? 4.3 to a 7.5 is a straight transplant through the middle,it helps if you are going green spot to green or red to red as the gear that runs through to the diff is different if you mix? also you will have to take out the pto drive to make room for a 7.5.and replace with a plate. then if you realy want to brake the sound barrier, change the crown gear and worm for a straight cut 11.1 instead of a 17.1,large wheels and tires like i did for a customer and you could reach 11.75mph. nigelB

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Andrew

06-18-2002 18:27:45




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 Re: Re: Re: Fordson N top speed (or lack of!) in reply to Roland, 06-17-2002 10:27:10  
Hello Roland,
To split the tractor, you could move either end out of the way; which ever suits you. The manuals say to wheel away the back end but they show a picture with wheels under the rear of the engine. Just remember to chock the front so it doesn't tip. You also need to remove the clutch pedal/fork assembly from the top to gain access to the gearbox "front plate". As I mentioned mine was an F gearbox. There are only slight differences. Take out the bolts and slide it forward. The shafts and gears should probably all come out at once.

I have a 1938 blue N which came to me with a seized gearbox. I think it just needs bearings and a good clean out. It’s not at the top of the list the list at the moment! It’s a 4.3 as well. The speed won’t worry me as it’s got steels on and it’ll clean up well.

I don’t have any of my Fordsons on registration but we can register them for about $60 AU which is pretty good over here. I think it equates to about the same.

Anyway, it’s good to hear about the earlier models as well.

Regards

Andrew

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