Hudson 481 Series Owner's Manual page 45

40
Figure 28
The foregoing is approximate normal timing for regular or non-premium fuels at or near
sea level. For final setting see "Fuel and Altitude Compensation."
FUEL AND ALTITUDE COMPENSATION
When Ethyl or premium fuels are used in place of the regular or non-premium grades,
a more advanced spark timing should be used and final tests should be made on the road.
Also when operating a car at high altitudes, it will be found that a more advanced spark
timing can be used than at or near sea level.
To determine proper spark timing for these conditions, with engine at normal operating
temperature, accelerate at full throttle from 10 trifles per hour in high gear. A "ping" should
be noted at approximately 15 miles per hour. If no "ping" is heard, loosen the distributor
quadrant screw (I), and rotate distributor body in a counter-clockwise direction one gradua-
tion mark at a time until the "ping" is heard. Under no circumstances, however, should the
pointer on the rear engine support be more than 1 inch (on 1st short mark) before the U.D.C.
l-6 or U.D.C. 1-8 mark on flywheels.
If the "pinging" is heard at speeds above those previously mentioned, retard the spark
timing by loosening the clamp screw and rotate distributor body in opposite direction, one
graduation mark at a time until the proper setting is obtained.
HUDSON OWNER MANUAL
The engine can be cranked by removing the
knurled cap on the starting motor solenoid and
pressing the button in quick succession.
The distributor rotation is clockwise. Loosen
the distributor advance arm screw (I) and rotate
the distributor housing clockwise to the limit of
the slot in quadrant. Take off the distributor cap
and remove the central wire from the cap. Place
the bare end l/8" from the cylinder head. Turn on
the ignition and rotate the distributor body
counterclockwise slowly just until a spark jumps
from the high tension wire to the cylinder head.
Tighten screw (I), replace central cable in cap,
and clamp cap on distributor.
With the distributor cap in position, the metal
strip on the rotor should be directly in line with
No. 1 terminal. The cables should be in the cap
terminals in the order, 1-5-3-6-2-4 or 1-6-2-5-8-
3-7-4, following in a clockwise rotation.