Sectional View of the Model T Motor. (Cut No. 2)
Cylinder Assembly, showing the correct position of the valves with time gears properly set according to punch marks on the gears, also the relative position of the pistons in their strokes as indicated above. The firing order of the cylinders is 1, 2, 4, 3. (Cut No. 3)
In fitting the large time gear to the cam shaft it is important to see that the first cam points in a direction opposite to the zero mark (see Cut No. 3). The time gears must also mesh so that the tooth marked zero (0) on the small time gear will come between the two teeth on the large gear at the zero point. The time gears now being properly set, the exhaust valve on No. 1 cylinder is open and the intake valve closed, the other valves being in the position indicated in Cut No. 3. The opening and closing of the valves being as follows: The exhaust valve opens when the piston reaches 5/16″ of bottom center, the distance from the top of the piston head to the top of cylinder casting measuring 3⅜″. The exhaust valve will close on top centre, the piston being 5/16″ above the cylinder casting. The intake valve opens 1/16″ after top center, and closes 9/16″ after bottom center, the distance from the top of the piston to the top of the cylinder casting measuring 3⅛″.
How the valve lifting tool should be used. (Cut No. 4)