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Antique Farm Tractors Vintage farm tractors on rubber tires with various implements. Ford, John Deere, Oliver, McCormick and more.

Antique Farm Tractors

1948 Case VAC Hard Starting


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  #1  
Old 09-24-2015, 02:52:50 PM
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Default 1948 Case VAC Hard Starting

Hi All,

Continuing to help my friend with his VAC. Its got brand new plugs, wires, points, condensor, and cap/rotor. After all those new parts its still hard to start, it is getting gas to the carb, as we can open the drain tap and gas will come out. Also its getting nice blue spark to the plugs.

Any thoughts on what to check next? Carb need an overhaul?

Thanks for any help/suggestions.
Regards,
Jordan
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Old 09-24-2015, 03:31:13 PM
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Default Re: 1948 Case VAC hard starting

when you try to crank it does the magneto impulse click when the motor is turning over
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  #3  
Old 09-24-2015, 04:08:18 PM
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Default Re: 1948 Case VAC hard starting

I would surgest if you dont already have them maybe try getting a hold of the parts and operators manuals aswell as the shop manual for the VA series or just the VAC.they should give you the proper specs and yes going over the carb would not hurt.have you tried cleaning up the sediment bowl ? as it might be full of junk.John

Last edited by casertractor; 09-24-2015 at 04:19:56 PM.
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Old 09-24-2015, 09:47:21 PM
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Default Re: 1948 Case VAC hard starting

Will it start if you choke it each time? Just thinking about the valves and intake gasket. Also check the carb / intake gasket, and make sure it's gas and not water coming out of the carb bowl, seen that before too. Timing been messed with? Check the little things, mainly the carb.
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Old 09-24-2015, 11:40:12 PM
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Default Re: 1948 Case VAC hard starting

ehpower2, this particular VAC is has distributor ignition.

casertractor (John), This tractor has been in my friends family since new, and he still has the original documentation that came with the tractor when purchased. I will look into the shop manual for the VA Series. Will look at the sediment bowl next time i'm near the tractor.

JIMnWV, no it won't start each time if its choked. Especially after it has run and we try to restart it. It was like this before we put all the new ignition parts on it. Will look at the carb/intake gasket next time I'm near the tractor. As far as I know the tractor has not had any major engine work done to it, so the timing should be as set from factory.

Thanks Guys for all the great help and suggestions so far,
Regards,
Jordan
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Old 09-25-2015, 05:55:05 AM
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Default Re: 1948 Case VAC hard starting

Next time your close to it pull the distributor cap off and wiggle the distributor shaft, any loose motion? Next time you have it running take a piece of paper size of a dollar and lay on top of the exhaust, hold on to it and watch it. It will flutter but if it tries to go down the exhaust you have exhaust valves not sealing properly. That's how I found the miss in my wife's VAI. Make sure adjustments on carb have not been altered too. Good luck.
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Old 09-25-2015, 09:38:17 AM
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Default Re: 1948 Case VAC hard starting

Thanks Jim. I will check the things you suggested next time i'm over at my friends and near the tractor. If the exhaust valves do turn out to not be sealing properly, does the head have to come off to do a valve job in order to fix that?

Thanks Again,
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Jordan
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Old 09-25-2015, 10:42:10 AM
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Default Re: 1948 Case VAC hard starting

Even though it has a nice blue spark, maybe try a different coil just to make sure yours is OK. Sometimes electrical issues can mimic fuels problems.
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Old 09-25-2015, 02:32:56 PM
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Default Re: 1948 Case VAC hard starting

Quote:
Originally Posted by Gene Williams View Post
Sometimes electrical issues can mimic fuels problems.
THIS........
Ignition and carburetor symptoms are identical.......
You have to rule one out to get to the bottom of things.......
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Old 09-25-2015, 02:52:17 PM
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Default Re: 1948 Case VAC hard starting

Thanks Craig and Gene,

Will add that to the list to check. I forgot mention in my original post but along with the other ignition parts the coil was changed with a brand new one. Still will check it out.

Thanks Again Guys for all the Great help! Hopefully we can get this licked, as this is one of my friends primary tractors that he uses.

Jordan
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Old 10-01-2015, 03:23:56 PM
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Default Re: 1948 Case VAC hard starting

Has their been any progress made with this tractor ?.John
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Old 10-02-2015, 09:39:36 AM
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Default Re: 1948 Case VAC hard starting

Good Morning John,

No progress yet. Going up to visit my friend this weekend , and we'll see what we can come up with.

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Jordan
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Old 10-02-2015, 01:55:43 PM
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Default Re: 1948 Case VAC hard starting

Quote:
Originally Posted by Jordan View Post
Good Morning John,

No progress yet. Going up to visit my friend this weekend , and we'll see what we can come up with.

Regards,
Jordan


I would say it has to be down to eather a fuel or electrical problem but you may need to go thru both to find the exact problem.what kind of system are you running 6 or 12 volt ? that might be your problem too also past owners might have altered the electrical system wich may cause it not to work/run properly and that also goes for the generator and distributor aswell as the coil.Hopefully you guys can find a solution and have this tractor back up and running soon.John
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Old 10-02-2015, 02:57:39 PM
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Default Re: 1948 Case VAC hard starting

Tractor has the original 6 volt electrical system and is still wired the way it left the Case factory. Coil is a new 6 volt coil, cap, rotor, points/condensor, plugs and wires have all been replaced with new. This is why we are baffled, its got all these new parts and we are having this issue.

My friend is leaning towards it being a fuel issue so we are going to try and find some numbers on the carb and see if we can get an overhaul kit for it.

Jordan
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Old 10-30-2015, 09:36:35 AM
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Default Re: 1948 Case VAC Hard Starting

Hi Guys,

Just a quick update, i'm currently in the process of overhauling the carburetor, a Marvel Schebler TSX series, and will hopefully have a chance to put it back on the tractor in the next week or so. Will let you all know how it goes.

Thanks Again for all the help,
Jordan
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Old 10-31-2015, 12:11:30 AM
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Default Re: 1948 Case VAC Hard Starting

Remember you need 3 things for the engine to run: Fuel, Spark, and compression. So... How's the compression?
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Old 11-02-2015, 03:49:49 PM
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Default Re: 1948 Case VAC Hard Starting

Oldtech,

Compression is good. As for the actual compression numbers per cylinder not sure, as we never hooked a gauge up to it to see.

Jordan
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Old 12-20-2015, 08:37:16 PM
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Default Re: 1948 Case VAC Hard Starting

An update,

Got the rebuilt Carb back on 2 weeks ago, and had the chance to adjust it last week after replacing the fuel line. Tractor starts and idles nice, and now restarts easily after shutting down. Hopefully we've got it licked now.

Now we are just waiting for a bit warmer weather to get it out and get it working so we can adjust the power screw properly.

Thanks Again for all the help,
Jordan
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