AC Model G oil level.

Mine is the same way. 3 1/2 quarts does put it over the full mark. Doesn't hurt anything as far as I can tell.

I know what the stated engine capacities are: 3Q or 3.5 Q with filter change. I've included a picture to illustrate my dipstick indication question. The engine is leveled on stands. 

The February 1946 Continental "Instruction Manual for Model N50 and N62" says the oil capacity is 4 quarts.

It includes:
"CAUTION: Do not overfill the Crankcase. An excess of oil does not improve lubrication. it causes high oil consumption, smoking, and carbon deposit. Fill to the proper level, never letting it come below the low mark on Bayonet Gauge.

DRAINING THE CRANKCASE OIL
A very important factor in reducing wear and maintaining engine efficiency is the frequent and regular draining of the Crankcase oil. Drain the used oil after the first twenty hours of operation, if used for industrial service, and after two-hundred miles, if used in automotive service. Thereafter drain oil each fifty hours for industrial engines and each five-hundred miles for automotive service.
    DO NOT WASH OUT WITH KEROSENE
The reason for this is that some of the kerosene will be trapped and will remain to thin out the new oil, reducing its lubrication properties. The best method is to drain the oil when the engine is thoroughly heated. This will carry off most of the sediment. IF, then, a pint of fresh oil is poured in through the Filler Pipe, it will flush out the remainder."

That last paragraph kind of hints that 3-1/2 quarts is the proper amount of oil for an oil change.

Another measure of the required oil depth is this:
"The crankshaft and connecting rod bearings are lubricated by oil forced through the galleries, which are cast in the crankcase, and through a passage in the crankshaft. Lubrication of the front and rear camshaft bearings is affected by oil forced through the galleries. The middle camshaft bearing is taken care of by splash from the connecting rods, and the cylinder walls are oiled from oil spurt holes in the connection rods and from the splash of the connecting rods."

So the oil is supposed to be deep enough that the connecting rods splash in it.

The Allis G service manual that I downloaded from www.HenselFamilyFarm.com/links/ says with the oil filter it takes 3-1/2 quarts of oil. Typically when the oil filter is changed the stated oil amount makes the oil level a little high until the filter is filled. The Continental manual doesn't mention any oil filter.

Gerald J.

Is the seal just below the top stop still on the dipstick? If it's gone that might be the problem. The best thing to do is get someone with a G tractor to put a tape on the pan, dipstick and dipstick tube and then check the numbers of yours and theirs.