Case vac

DAVE Thompson jr · Dec 15, 2013

I own a 1956 case vac just for plowing tne driveway in the winter. My driveway is long and asphalt. I totally rebuilt this tractor from the front to the back. total engine overhaul and transmission everything. When it is cold outside it runs like hell for the first 15 minutes and then runs fine. Ive went thru the carb again cant find anything wrong. when its warm outside or the engine is good and hot it runs perfect. Anybody got any ideas. I thought it was in the carb but cant find anything wrong. I went bigger on the bore and had some head work done when I overhauled the engine it will hold 40 hp on the dyno.

VicS · Dec 15, 2013

Just a shot in the dark. But I think you need carb heat! Somehow try to get your intake air right over the exhaust manifold. Like a airplane, they have a butterfly to get carb heat. Once I tried running 3/8 copper line around the manifold right above the carb, ran hot water through it. This worked but took to long.

DAVE Thompson jr · Dec 15, 2013

you are probably correct. It runs fine when warm. The neighbor likes to plow snow so he comes over and gets the tractor out of the garage and plows everyones drive out all I do is keep it full of gas and mine is clean. I just cant stand it when something doesnt run correct. I put alot of money into the engine and restoration. It was worth every dollar when I can drive up that big hill with no problems in the winter. I want to keep everything original on it.

Anonymous-0 · Dec 15, 2013

any pictures of the tractor,,,

CLIFF S · Dec 16, 2013

Dave

A guy I built a pulling engine for his VAC done the same thing when he done winter pulls so he bolted a stainless shield from the exhaust side of the manifold down the intake to capture the exhaust heat from the weep hole and it worked great!

Cliff S

ss55 · Dec 16, 2013

Maybe restrict the airflow into the radiator and add side curtains along the engine to direct the heat off the radiator past the carb to keep the carb warmer? Similar to the front part of a HeatHouser or WeatherBreak. That helps on other brands of tractors run better in cold weather.

mattwillson · Dec 16, 2013

The VAC I have used to run like yours does. It turned that 2 of the rocker arms were mixed up causing the push rods to bind against the head.

DAVE Thompson jr · Dec 17, 2013

I dont know how I could put the rocker arms on wrong. But thanks for the advice. It would be almost impossible to adjust the valves and you would see that the push rod wasnt correct. At work when engines are adjusted wrong it is easy to notice by the length of the adjusting screw. after you take the lash out of it and do the adjustments everything should be almost the same if one is much different than the others there is a problem. I always check for that. Two revolutions of the engine and the adjustments are done. The first one is with the camshafts pinned and the second round is done with it rotated and the flywheel pinned. Injectors are set at the same time the valves are adjusted. Unless it is a Marine reverse rotation engine. If you dont set then different you bend alot of valves. Il get the case figured out. Just glad the Neighbor likes plowing snow.

bock · Dec 17, 2013

does the tractor have a thermostat in it

mattwillson · Dec 17, 2013

They are left and right handed, and they can easily be mixed up .

DAVE Thompson jr · Dec 19, 2013

Thanks for the picture. Il check that.

Case vac

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