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48 8N

The Old Girl Just Won't Get Up to Speed?

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Steve

07-17-2002 20:17:44

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Hi, my 1948 8N starts but it is like she just wants to idle.....no rpm's when you give her throttle?

I have changed the coil, plugs, points, condenser, rotor, cap & rebuilt the carb (gas is getting through to carb okay, filters all cleaned or replaced) but she will start at less than half throttle (only at a idle speed mind you) and run all day but she won't go ever fast enough to drive anywere, moving throttle up has very little noticable effect on the rpm's but if you drop the throttle to low she dies....

Help, I'm stumped, any ideas for me to try?

Thanks
Steve

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Steve Keluke

07-20-2002 10:16:52

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Hi, everyone (Wayne, John, Don, Richie, Dell, Jack & Fast Ed), looks like Dell may have got it licked.....

Removed distributor and found the weights had come out of there slots (pin holes).

I ordered a new distributor assemble but I won't see it for 2 weeks, I may try and use the old one (by forcing the pins back in the slots) just to see if it works, if I do I will let you know the out come in a couple of days.....

Thanks for all your help!
Steve

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Wayne

07-19-2002 21:18:28

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

We are interested in the final fix you come up with on this. Don't forget to let us know what it turned out to be. Thanks.

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John

07-19-2002 06:15:38

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Steve, I didn't read all your replies, as I just got off work and I'm beat. But I would pull the distributor and check the timing advance weights to be sure they move freely. Good luck John

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DON TX

07-18-2002 19:51:28

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Check the butterfly vave in the top of carb. HTH DON TX

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Richie Magoo

07-17-2002 21:24:35

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Another possible culprit: The li'l doo-hickey that the end of the accelorator control rod attaches to (In other words....the thing that moves the accelorator to governor rod..... .just in front of the steering box)

Sometimes the clamp comes loose.....and the control thingie pivots...but doesnt move the rod.

In other words...you might be moving the throttle lever....but it may not be moving the linkage-to-governor rod.

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Steve Keluke

07-18-2002 17:09:01

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Richie Magoo, 07-17-2002 21:24:35

Hi Richie, I have checked the governor/carb linkage ... everythings seems to be working, any other suggestions?

Thanks
SteveK

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Richie Magoo

07-18-2002 17:34:54

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Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve Keluke, 07-18-2002 17:09:01

Steve: Ignore my last response- I just read the more recent posts....and you've already narrowed the problem down to most likely being in the carb.

My next step, before condemning the carb, would be to start the tractor and squirt all around the intake manifold with WD-40 or choke cleaner or ether. Both where it joins the carb, and where it joins the engine. If, as you're spraying, the idle increases, it means you have a vacuum leak. If not....we'll have to keep trying!

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Richie Magoo

07-18-2002 17:23:48

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Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve Keluke, 07-18-2002 17:09:01

Hey, Steve,

Oooooo -K..... here's something else to try: You know the big screw on the front of the carburetor, that adjusts the richness? Try turning that in either direction (counting your turns, so you can set it back to where it was when you're done!). If turning the screw has no effect on the engine speed or quality of its' running, then your main jet is blocked/screwed up. If the motor responds to the turning of the screw (wasn't that the title of a play by Shakesbeer?)then your carb is probably O-K, and we can rule it out, and look elsewhere for our gremlin.

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Dell (WA)

07-17-2002 20:47:33

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Steve..... ..... assuming that you have your 8N carb to governor rod connected onto the short lever of the governor and the throttle arm to the governor lever with the spring. That leaves a hung-up centrifical advance spark mechanism in your frontmount distributor. Old parts are known for breaking down and lack of engine speed is a common fault of the distributor centrifical timing advance..... .....Dell

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Steve Keluke

07-18-2002 17:06:31

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Dell (WA), 07-17-2002 20:47:33

Hi Dell, carb linkage is working okay.... what do I need to do to correct and/or check the timing?

Thanks
SteveK

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Dell (WA)

07-18-2002 21:23:13

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Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve Keluke, 07-18-2002 17:06:31

Steve..... ....Front mount distributor is a 2-bolt removal procedure. distributor drive is offset so it can only go on correctly. (don't use a bigg hammer)

Remove distributor, take to work bench, open up and inspect for centrifical advance weights to piviot freely, inspect that retract springs are properly hooked up.

Time per I&T FO-4 manual ($29 cheap, gettcha one). Their timing picture is worth a 1000 words..... .....Dell

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Wayne

07-17-2002 20:47:04

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Disconnect the rod from the gov to the carb and move the carb lever by hand to see if full throttle is attainable. I suspect your gov linkage is all messed up. Go back and snug everything up and follow the directions for governor adjustment. Did this just start happening? Have you had the gov off? There is an internal adjustment in the gov but should not change on its own. Maybe the gov is bound up internally, it is simple to take it off and examine. If you can't get full throttle with the gov rod disconnected and manually moving the carb lever, you have internal carb problems. I assume you have adjusted the throttle lever itself for full travel.

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Steve Keluke

07-18-2002 17:12:19

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Wayne, 07-17-2002 20:47:04

Hi Wayne, tried your suggestion re moving carb lever by hand no increase in rpm.... any other suggestions?

Thanks
SteveK

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Wayne

07-18-2002 20:48:48

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Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve Keluke, 07-18-2002 17:12:19

I reread the string and can't believe the trouble you are having! I can't believe the timing is the problem because it starts, etc. The problem has to be in gas flow up thru the main jet. TAke the carb apart again and run wires thru the passages and blow them out again, I have had to do that sort of thing repeatedly! The other unlikely thing is a flat cam or lifters way out of adjustment. No, that is too far out. To recheck timing, bring #1 up on compression (feel with finger in hole) and find the timing marks on the flywheel (hard to find and there are 2 sets, one will be for #1 on compression and the other #1 on exhaust). Align the 0 mark with the pointer, look at rotor on dist to see if it is pointing to #1 wire. Then loosen dist clamp and rotate it till the points just start to open (you can put a meter in system to see exact opening point if you like). Clamp it down and restart it.

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Wayne

07-19-2002 07:40:11

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Re: Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Wayne, 07-18-2002 20:48:48

Forget my instructions to check the timing. I forgot you had a front dist. With those it is not possible to get it in wrong, not a bad idea by Henry. The only problem with those is getting enough advance out of it. The small allowance for external adjustment is never enough. You have to play games with the point gap setting to get more advance. Dig further down into the dist and check the centrifugal advance for cleanliness. On the front dist models, there is no inspection hole to view the flywheel! Henry left that out thinking his foolproof distributor installation made it unnecessary! Thus it is impossible to find TDC as you can on any other motor.

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Jack - Illinois

07-17-2002 20:40:21

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Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Steve, 07-17-2002 20:17:44

Possible governor problem. Can you get it to rev up if you reach behind the carb and manually open the butterfly?? Will the shaft on the carb manually rotate about 1/4 turn when all is hooked up??

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Steve Keluke

07-18-2002 17:15:03

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Jack - Illinois, 07-17-2002 20:40:21

Hi Jack, tried to manually move carb but no increase in rpm's .... any other suggestions?

Thanks
Steve

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Fast Ed Ohio

07-17-2002 20:56:58

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Jack - Illinois, 07-17-2002 20:40:21

I had a mouse build a nest in the carb intake tube once , wasps nest will do the same, air starvation problem ??

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Steve Keluke

07-18-2002 17:16:34

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Re: Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Fast Ed Ohio, 07-17-2002 20:56:58

Hi Fast Ed, no, no mouses or wasps.....

Thanks
Steve

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Fast Ed Ohio

07-17-2002 20:55:17

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Re: Re: 48 8N - The Old Girl Just Won't Get Up to Speed? in reply to Jack - Illinois, 07-17-2002 20:40:21

I had a mouse build a nest in the carb intake tube once , wasps nest will do the same, air starvation problem ??

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