Reasons For Motor Missing; If Motor Lacks Power - Hudson Super Six 1916 Reference Book

1. Short circuited spark plug.
Points not adjusted .025" to .028".
2. Partially short circuited or
broken secondary terminals.
3. Poor contact between the
various ends and clips of wiring.
4. Loss of compression
in one or more cylinders.
Valves may be stuck. Valves
may need regrinding or
reseating. Valve springs may
be weak or broken.
5. Water in gasoline,
causing the motor to run
spasmodically. (This is dif-
ficult to distinguish from
other causes, and should be one
of the last things looked
for.)
6. When the motor misses, you may locate the missing cylinder by opening the priming cock on top of the
cylinders, one at a time. After replacing the spark plug in the missing cylinder with a new one, you will have to
determine whether the missing is caused by defective plugs or wires leading to same. If the trouble is still
continuing, turn over the motor slowly by hand in an endeavor to detect a defect in the compression in the
different cylinders.
7. If missing is not due to any of these items, there may be an air leak between the carburetor and the intake
manifold, or between the manifold and the cylinder bloc.
8. The check valve on top of the Vacuum tank which shuts off the suction from the intake pipe, may not be
seating properly and gasoline is being drawn through into the intake. This will cause continual missing an
cylinders No. 4, 5, and 6. For further details, see the instruction book on the Vacuum system or take the car to the
nearest Stewart Service Station
9. If any wires in the entire electrical system have been tampered with at any time, refer to the wiring diagram
on page 60.
The motor will run, but will not pull on grades or under heavy loads.
1. Loss of compression due to leaky valves.
2. Too rich a mixture through some trouble in the carburetor, probably flooding due to grit under the float
valve.
3. Late ignition. (See directions for timing the distributor, page 56 retarded spark.)
4. Lack of water in the radiator, or of oil in the motor, causing the motor to run hot.
5. Lack of gasoline. 11 this is due to stoppage of pipe, the motor will spit back through the carburetor when
the throttle is opened.
6. Poor grade of gasoline in cold weather, causing too weak a mixture.
7. Dragging brakes. See that the car can be rolled by hand easily or that it will coast down hill when the clutch
is released and does not slow down- Feel the brake drum with your hand to determine overheating.

Reasons for Motor Missing

If Motor Lacks Power

19