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Case Tractors Discussion Forum
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Couple of VAC Questions

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John L.

02-04-2004 05:50:08




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So I'm off to try and get my father's '48 VAC up and running. As of right now I'm not sure what I'm looking at, but I'm pretty sure it's either a fuel or a fire issue (gee, that really narrows it down). The carb was rebuilt by what I believe is a somewhat qualified tech. However, my understanding is that since the carb was reinstalled the tractor hasn't started. My father doesn't believe he got a gas smell either when trying to start the tractor, so I'm leaning toward there being no fuel getting to the motor.

Any tips on troubleshooting the carb? The most I've ever done is adjust the carb on this tractor, never had it off much less torn apart.

Any tips on finding out whether we are getting fire from the coil and to the plugs short of grabbing a wire and seeing if I get a good shock?

Finally, anyone know the capacity for the radiator on the VAC? We're going to need to refill that since when my father removed the stack to get at the carb the stud came with it and a lot of the antifreeze leaked out.

Thanks in advance!

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Chicken

02-04-2004 10:34:22




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 Re: Couple of VAC Questions in reply to John L., 02-04-2004 05:50:08  
The other guys hit it right. I usually pull one spark plug and leave the wire attached to it and put it up against the block and crank the engine over and you should see a spark jump the plug gap.
Dont forget it does not take much corriosion on the points to keep an engine from starting but will give a weak spark on a plug that is not under compression, resulting in a no start. Never rule out inginition problems as they are easly stoped dead in their spark by bad connections or corriosion. Hope this helps. Chicken

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ff316

02-04-2004 06:33:29




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 Re: Couple of VAC Questions in reply to John L., 02-04-2004 05:50:08  
To check for fire, pull a plug wire off. Pull the boot back to expose the terminal. Hold it WITH PLIERS next to the plug. Have someone crank the engine and see if a spark jumps from the terminal to the plug. Auto parts stores sell something that looks like a spark plug for testing fire, it has a clip built onto it and something like a sight glass on the bottom. They are made for electronic ignition, I don't know if they work on points or not. Good luck, Fireman in KY

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Dave

02-04-2004 06:20:13




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 Re: Couple of VAC Questions in reply to John L., 02-04-2004 05:50:08  
John,

Rule out the fact that you are not getting spark. If the tractor ran BEFORE you had the carb rebuilt, I would definetly look into the fuel problem. Check all fittings and make sure that no fuel lines are pinched.

First thing I would do is unscrew the fitting, at the carb, that comes from the fuel tank and see if you have gas to that point.
Next if you have fuel comming to the carb, you will have to open up the carb and see if the float is stuck If you have to go into the carb don't fret. Lay down a towel to place the parts on, and get yourself comfortable, as you remove the bowl be careful to not tear the gasket. If it is easy for you, label all bolts if necessary. If the float is not stuck you will have to check if the needle and seat are operating correctly, this is where the fuel comes into the carb.

If this is operating correctly you will have to take her all the way appart.

As for taking out the jets, most will be seated against a shoulder(internal jets). For the adjustable jets, just count the number of turns till they are closed, then unscrew them out.

Once you have all the jets out, use carb cleaner and with the aid of the little red hose, aim a blast of spray into all the orrifices and make sure all passages are clear, checking for blockage in the jets themselves.

After you have determined that they all are clear you can start to reassemble the carb. MOST of the time you can't make a mistake putting the jets back in the correct position because of thread fit.

Re-adjust the adjustable jets and give her a try.

Good luck, let us know how it turns out.

Dave freezin' in Wis AGAIN

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John L.

02-04-2004 12:44:59




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 Re: Re: Couple of VAC Questions in reply to Dave, 02-04-2004 06:20:13  
Thanks all! So far I'm thinking there is nothing from the coil. I pulled the plug wire from the coil (at the coil end) and watched while someone turned the engine. I saw nada. I do have a couple of corroded wires that I'm going to replace, and maybe replace the coil while I'm here (if I can get one locally or get one sent overnight).

One odd thing I noticed is that the accellerator doesn't seem to be moving the way I would expect. Once the accelerator control on the carb is in it's forward most position, it never seems to go back. There is also significant play in the accel. pedal as well as the hand control. Does this play get taken up when the tractor is running? 30 years with this thing and I never noticed.

I'll keep everyone posted!

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Chicken

02-04-2004 14:24:34




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 Re: Re: Re: Couple of VAC Questions in reply to John L., 02-04-2004 12:44:59  
Just remember if the tractor is not running the governer is not opperating, the governer controls the carb the throtle controls the governer
Pete



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John L.

02-05-2004 08:46:23




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 Re: Re: Re: Re: Couple of VAC Questions in reply to Chicken, 02-04-2004 14:24:34  
Thanks for all the replies folks. I'm still not seeing spark after rewiring from the switch to the coil, from the coil to the distributor, replacing the coil, and cleaning up the switch. I'm now in the process of replacing the points and condensor. Amazing I've gotten everything from our local NAPA store - they had it all in stock. See my other thread started at 11:45 am or so today (5 Feb) regarding how to set the points.

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