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8N Governor or Throttle Problem?


 
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Defndr
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PostPosted: Mon Sep 24, 2012 10:53 am    Post subject: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

I put a new governor on my 8N because the old one leaked. I started it and the throttle only needed 1 inch movement to go idle to full power plus. I then put on a brand new carb from Tractor Supply thinking that may be the problem. I runs fine but I only need to move the throttle one inch still to go from 400 RPM to 2200 RPM (would go higher but I stop moving the lever so I don't blow it up).

Does anyone know what could cause this? I re-dd all the linkage so I think it is correct. I am just getting it all back together after taking it all apart to paint and replace worn parts.
 
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Mr. T. Minnesota
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PostPosted: Mon Sep 24, 2012 11:17 am    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

DFD,
I am having the same problem. I completely rebuilt the old governor and the throttle range did not change?? Moving the throttle one inch is full throttle. Checked the linkage and it is within specs. I am to the point of thinking the throttle butterfly may be reversed, but do not know if that is possible. Have had the carb apart many times and do not believe that can happen. Hope help is out there.
Mr. T. Minnesota
 
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Dell (WA)
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PostPosted: Mon Sep 24, 2012 11:22 am    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Defndr.......uh? factory specs for flathead 8N engine is 400-to-2200 rpms. dunno what you are complaining about. Yes, yer carbie will effect engine operation. Where is this 1-inch that you are complaining about??? .......respectfully, Dell
 
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Defndr
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PostPosted: Mon Sep 24, 2012 11:35 am    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Dell (WA) wrote:
(quoted from post at 12:22:01 09/24/12) Defndr.......uh? factory specs for flathead 8N engine is 400-to-2200 rpms. dunno what you are complaining about. Yes, yer carbie will effect engine operation. Where is this 1-inch that you are complaining about??? .......respectfully, Dell


The thottle lever goes from the idle position (full left stop) to 2200 (it would not stop at 2200 but I stop moving it there) in about one inch of travel to the right (maybe 1/4 of avaliable travel of the throttle lever). It should go to the full right stop and be at 2200 RPM not at be at 2200 RPM at 1/4 travel. Hope that makes sence. If I try to use it like this it will eventually get bumped and over rev the moter since the lever can move a few more inches.
 
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Dell (WA)
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PostPosted: Mon Sep 24, 2012 12:02 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Defndr.......ok, so yer talkin'bout the dashboard mounted throttle quadrant with notches. Gitt-outt yer FO-4 manual ($25, cheap) and look at 'chur throttle lever layout. .......respectfully, Dell
 
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Defndr
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PostPosted: Mon Sep 24, 2012 12:28 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Dell (WA) wrote:
(quoted from post at 13:02:15 09/24/12) Defndr.......ok, so yer talkin'bout the dashboard mounted throttle quadrant with notches. Gitt-outt yer FO-4 manual ($25, cheap) and look at 'chur throttle lever layout. .......respectfully, Dell


Thanks Dell, Yes that is what I'm talking about. I just did not know how to say it so someone not looking at it would know what I ment. I have been looking in the manuals for this thing and the only adjustment I can find is to lengthen the governor linkage rod. That did not help at all. All the other linkage looks correct to me.
 


Last edited by Defndr on Mon Sep 24, 2012 12:28 pm; edited 1 time in total
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Bob Harvey
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PostPosted: Mon Sep 24, 2012 1:53 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Not SURE, but it seems, IIRC, that the throttle to govenor rods can get mixed up. Better remembery guys will pipe in. Gots a parts diagram ? HTH
 
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Defndr
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PostPosted: Mon Sep 24, 2012 2:26 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

I just tried adjusting the linkage again. No luck. I had tried all combinations earlier. I put the old one on and it worked good. I guess the new governor may be bad. Cheap Chinese garbage we are forced to buy here in American now days! The only problem is that during a 2 minute test the old one dumped 1/2 quart of oil out. I tried switching the spring out from the old one to the new one also. No change.

Maybe the new ones need some adjustments?
 
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8N'r--WI
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PostPosted: Mon Sep 24, 2012 3:00 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Defndr---for starters, long linkage rod goes to long governor arm, short linkage rod from carb to short arm of governor....long to long, short to short.

First, unhook the LONG linkage rod at one end, place your throttle arm in the "idle" position. Now adjust the LONG linkage rod so that it just fits snuggly between the throttle linkage and the governor arm. Low rpm is now set.

I assume you have a late model 8N with tachometer/hour meter as you seem to know what the rpms are.

Look at your governor, there is a "stop nut" at the bottom of the arm that allows you to "set" the high end at 2200 RPM"s. This nut simply screws in and out and when adjusted correctly will not allow the rpm"s to exceed the set limit.

Next, start the tractor, and increase the throttle until your rpm"s arrive at the 2200 rpm level and SET the stop nut at this point.

You now should be very close to finish settings, other than possible carb adjustment.

Tim
 
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Defndr
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PostPosted: Mon Sep 24, 2012 3:55 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

8N'r--WI wrote:
(quoted from post at 16:00:24 09/24/12) Defndr---for starters, long linkage rod goes to long governor arm, short linkage rod from carb to short arm of governor....long to long, short to short.

First, unhook the LONG linkage rod at one end, place your throttle arm in the "idle" position. Now adjust the LONG linkage rod so that it just fits snuggly between the throttle linkage and the governor arm. Low rpm is now set.

I assume you have a late model 8N with tachometer/hour meter as you seem to know what the rpms are.

Look at your governor, there is a "stop nut" at the bottom of the arm that allows you to "set" the high end at 2200 RPM"s. This nut simply screws in and out and when adjusted correctly will not allow the rpm"s to exceed the set limit.

Next, start the tractor, and increase the throttle until your rpm"s arrive at the 2200 rpm level and SET the stop nut at this point.

You now should be very close to finish settings, other than possible carb adjustment.

Tim


Thanks, I have adjusted the linkage like that but the set screw will not work to set the high limit since I can't advance the throttle lever beyond one inch, as it reves up too high beond that. The throttle lever must be closer to the full position for it to reach the stop. I think this is a bad governer. I put my old one on again for the fourth time and it started scwealing now.
 
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Defndr
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PostPosted: Mon Sep 24, 2012 6:16 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Saw the arms looked a bit different. Seems one was cast a bit off. I tried to grind it but ended up making it worse. I guess I will try to swap the old one into the new case although it looks a bit different also. Oh, those crazy Chinese.
 
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Bill Rowles
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PostPosted: Mon Sep 24, 2012 10:05 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

The problem is in the governor mechanism. The large balls are supposed to push on the mating race harder as engine speed increases to close carb. butterfly at the setpoint determined by your throttle setting. The balls are not doing their job so engine speed increases as you increase throttle setting without any feedback to control speed.....You need to have someone inspect the governor who understands how it works and can identify the reason it is not doing its job.
 
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Greg 2N (TX)
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PostPosted: Tue Sep 25, 2012 9:18 am    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Defndr,

Wow,

Maybe we can get somewhere here...

Is the governor at least fighting back when RPMs go up... i.e. the lever that connects to the carb moving when rpms go up?

Have you checked your shim adjustment inside?

Post back,

Greg
 
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Defndr
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PostPosted: Tue Sep 25, 2012 5:21 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Greg 2N (TX) wrote:
(quoted from post at 10:18:41 09/25/12) Defndr,

Wow,

Maybe we can get somewhere here...

Is the governor at least fighting back when RPMs go up... i.e. the lever that connects to the carb moving when rpms go up?

Have you checked your shim adjustment inside?

Post back,

Greg


No, the governor doesn't seem to be doing anything. I took the guts including the arms off the old one and put in the new case. It did not work at all. I think the new case is a bit different size, I had a hard time getting the old guts to work in it. I also tried the new governor with the old arms, no luck.

I think it is so messed up now from swaping things around that I will just try and find a used one to swap on here. If that doesn't work I will rebuild the used one I buy. I really feel this new one is of so poor quality as to be unusable. Then I will have to try and figure out how to do the shim adjustment. LOL
 
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Greg 2N (TX)
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PostPosted: Tue Sep 25, 2012 10:31 pm    Post subject: Re: 8N Governor or Throttle Problem? Reply to specific post Reply with quote

Ouch,

Sorry to hear it...

Yea, better to rebuild your old one.
That's what I did with mine.
For me, the shim adjustment took a few go rounds,
but I licked it good and proper.

For a dumb city kid, I did real well studying it to death and figuring it all out.

I have all the confidence in the world for ya...

Greg
 
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