Hudson Duo-flo Automatic Lubricating System, insuring proper lubrication from
the first turn of the engine, combined with a fully compensated crankshaft, provides
unusually long life and smoothness of operation.
The engine mounting is of three-point type with rubber grommets at both front
corners and a live rubber block at the rear end.
Crankshaft, Connecting Rods and Pistons
The crankshaft is a heavy forging with integral compensating weights. Full com-
pensation, together with five main bearings and a torsional dampener mounted on the
front, insures free running of the crankshaft under all operating conditions. The main
bearings are removable bronze-backed, virgin babbitt, and are fitted to .001" clear-
ance and provided with shims for adjustment. The working member of the dampener
is rubber, fully enclosed, requiring no adjustment.
The connecting rods are steel forgings with a heavy lower section to provide rigid
support for bearings, which are of spun virgin babbitt fitted with a clearance of .001".
The close fitting, hardened steel connecting rod bolts are securely locked in place
through the use of special "Palnut" locking nuts, having spring tension against the
regular hex connecting rod bolt nut.
The positive spring tension, applied to the regular hex nut in place of the former
practice of using cotter keys, positively assures the connecting rod bolt nut from
loosening.
The upper end of the connecting rod is fitted with a bronze bushing to which the
piston pin is fitted with .0003" clearance.
The pistons are of silicon aluminum alloy of new design. This alloy is hard, lighter
than aluminum, and dissipates heat rapidly. The piston is "T" slotted to compensate
for expansion; cam ground to give full bearing on the cylinder wall; and is fitted with
two compression rings and one oil control ring above the piston pin and one oil
control ring below. With this arrangement all of the rings are located somewhat lower
down on the piston, with the result that cooler operating conditions and better oil
control are obtained. The piston is attached to the connecting rod by a full floating pin
which is honed to give a perfect bearing in the diamond-bored piston bosses. The
piston pin is a snug fit in the piston bosses when the piston is heated to 200° F.
This piston design permits fitting to the cylinder with a clearance of .002". The
pistons are removable either from the top or bottom of the cylinder bore.
Camshaft, Tappets and Valves
The camshaft is Electric Furnace alloy with hardened bearing and cam surfaces.
The tappets are of the roller cam type which closely follow the cam, thus providing
for quiet, long-lived operation. The tappets are adjustable to provide proper clearance
for the silchrome steel valves.
Valve springs are of high-grade steel and are encased in steel cups to maintain
alignment and prevent spring flutter at high speed.
40 H U D S O N T E R R A P L A N E
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