Hudson 1947 3/4-TON COMMERCIAL, Owner'S Manual, Page: 27 / 75

CHANGING THE WHEEL AND TIRE
Before raising the car, remove the hub cap with a screw driver and with the hub
bolt wrench (jack wrench) loosen the hub bolts one turn. Raise the car sufficiently to
clear the ground and then remove all hub bolts and take off tire and wheel.
When installing the spare, be sure the pilot stud in the hub is in the top position, then
slide wheel onto hub using pilot stud as a guide. After wheel has been installed and car
lowered, again check tightness of hub bolts and replace hub cap.
ENGINES
THE ENGINES used in six and eight cylinder Hudson cars are of "L" head type,
designed for maximum efficiency and smoothness of operation. Live rubber cushions
are used at both front corners and at the rear center of the engine to provide flexibility
in the engine mountings. These cushions prevent engine sound or vibrations from being
transmitted to the chassis and body.
THE CRANKCASE AND CYLINDER BLOCK, cast integrally for maxi-
mum rigidity, is of high chrome iron alloy. The use of this hard material permits
seating the valves directly in the block which allows better transfer of heat from the
valve seats. Valve life is accordingly prolonged and frequent valve grinding is unnec-
essary.
THE PISTONS are of cast aluminum alloy, cam ground and are closely fitted in
smoothly finished cylinders.
PISTON RINGS are of the pinned type, to prevent ring rotation and permit their
maintaining greater efficiency over a longer period of operation.
TWO COMPRESSION RINGS and one oil ring are assembled above the piston
pin and one wiper oil ring is located below the piston pin. The compression rings are
specially processed to promote quick seating and freedom from scuffing.
THE PISTON PINS are of the full floating type, pressed in the diamond bored pin
bosses. Round spring steel lock rings set in grooves in the bosses hold the pins in place.
THE CONNECTING RODS are of drop-forged steel, I-beam construction, shim-
less type, with lower end bearings of spun bearing alloy. Integral dippers on the lower
ends of the rods passing through the oil troughs serve to circulate the oil, by splash,
throughout the engine.
PISTONS AND CONNECTING RODS are selected for uniform weight to
assure engine balance. They may be removed from the top on six cylinder models and
from the top or bottom on eight cylinder cars.
THE CRANKSHAFT is of heavy drop-forged steel with integral counter-
weights. It is balanced both statically and dynamically to maintain maximum bearing
life and smoothness of operation. A vibration dampener pressed on and keyed to the
front end of the crankshaft dampens out torsional vibration.
HUDSON OWNER’S MANUAL 25