Fig. 32. Stromberg Model M—Adjustment Points
5. All piston rings should be tight and leak proof in order to insure good and even compression in all the cylinders. Without good and even compression in all the cylinders it is impossible to obtain the maximum power from the motor, and it is also impossible to obtain good idling of the motor.
6. It should be seen that the ignition system is delivering a spark to each spark plug without missing.
7. The spark plugs should be clean, and the accumulation of carbon on the inside of the plug should not be sufficient to cause fouling or short-circuiting of the plug. In the case of a short circuited plug it is impossible to obtain a spark at the end of the high tension cable, but this does not indicate that the plug is firing. For best results the gap of the spark plug should never be less than .020″ nor more than .032″. A good setting is at about .025″.
The foregoing constitute some of the more important troubles to look for when the motor is not performing satisfactorily.
Installation and Adjusting.—We are finally ready to proceed with instructions for installing and adjusting Model M carburetors.
1. Try the throttle lever and the air horn lever by moving same with the hand before the carburetor is installed, and be sure that the butterfly valves are open to the limit when the respective levers come in contact with their stops. Also be sure that when the throttle valve is closed, the lower side of the butterfly is adjacent to the hole through which the idling jet projects.
2. Prepare a paper gasket about .020″ thick to fit the flange of the carburetor. Shellac same and then attach the carburetor to the flange of the intake manifold very securely by means of proper cap screws.
The attaching of the gasoline line, hot-air stove, hot air flexible tubing, and choke control need not be discussed in detail as these installations are very simple.