A two page advertisement from The Literary Digest of December 13, 1930:
ONE OF THE outstanding features of the new Ford is the precise care with which
each part is made and assembled. Many measurements are accurate to within one
one-thousandth of an inch. Some to three ten-thousandth of an inch.
This craftsmanship in volume production is particularly apparent in the pistons, valves and crankshaft--the most important moving parts of an automobile engine. To insure perfect fit in the cylinders, the aluminum pistons of the new Ford are held true to within one one-thousandth of an inch of the specified diameter of 3-7/8 inches. In weight they are not permitted to vary more than two grams (1/14 of an ounce). The wrist-pin holes are diamond bored within a variation of three ten thousandths of an inch.
The Ford valves are made of chrome silicon alloy, selected because of its durability and resistance to the oxidizing effect of hot gases. The valve stems are held exact in diameter to within one one-thousandth of an inch along their entire length. There is never a variation of more than two one-thousandths of an inch from the seat to the mushroom end.
Each half of the hole in the guide through which the valve stem passes is made to limits of five ten-thousandths of an inch. This insures accurate centering of the valve and minimizes the possibility of gas leakage and loss of compression.
It also reduces carbon deposits which cause sticking
The Ford crankshaft is made of carbon manganese steel and is ground, machined and polished to measurements as fine as five ten-thousandths of an inch. Ford crankshafts receive more than 150 gage tests for accuracy.
The main and connecting rod bearings are polished to mirror-like smoothness within a tolerance of one one thousandth of an inch. End clearances between the connecting rod bearing faces and those of the crankshaft are held to the unusually close limit of five one-thousandth of an inch.
Great care is taken to insure the proper static and dynamic balance of the crankshaft. The machines used for the dynamic balance tests are set upon foundations of gum rubber and are so delicately adjusted that the very air which surrounds them is first cleansed and then held at 68¡ by thermostatic control.
Though weighing many pounds, the Ford crankshaft is so carefully balanced that it will remain motionless in any position when placed upon two perfectly levelled parallel bars, yet will turn if but two grams weight is placed on any connecting rod bearing.
In addition to the many check-ups and inspections in manufacture, every Ford crankshaft is set in the motor block and given a run-in test approximating actual service. Only then does it receive the final O. K.
This accuracy in manufacturing, combined with simplicity of design and the high quality of materials, has a definite bearing on the good performance of the Ford and its economy of operation and up-keep. Throughout, it has been made to give you many months and years of satisfactory motoring.
For more indepth history and pictures reference site is at Marco's Ford Model A Barnyard, lots of good information and trivia about the Model A.
Dreams will come true in many homes this Christmas. For there, among the holiday gifts, will be a gleaming new Ford. From Dad to Mother. Or from Mother and Dad to Son or Daughter. Not a gift for the day only, but one that will be used and treasured throughout the year. A practical, lasting gift that will bring countless happy hours and shorten the miles to friends and distant places.
Car Stuff Dir |
Top |