Lubrication System - Hudson Terraplane De Luxe 1935 Owner's Manual

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Table Of Contents

Table of Contents

mounted on the front, insures free running of the crankshaft under all oper-

ating conditions. The main bearings are removable bronze backed, virgin

babbitt and are fitted to .001" clearance and provided with shims for adjust-

ment. The working member of the dampener is rubber, fully enclosed, requir-

ing no adjustment.

The connecting rods are steel forgings carrying spun virgin babbitt bearings

in the lower end fitted with a clearance of .001" and having shims provided

for adjustment. The upper end is fitted with a bronze bushing, to which the

piston pin is fitted with .000clearance.

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 hearing 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 .001".

The pistons are removable from the top of the cylinder bore.

The camshaft is Electric Furnace Alloy, with hardened bearing and cam

surfaces. End play is prevented by a spring and plunger pressing against the

front end of the shaft.

The valves, which are silicon chromium steel, are operated by the cams

through adjustable tappets. The tappets should be adjusted while the engine is

at normal operating temperature. To adjust the tappets, remove the engine side

cover plates (right side of engine below intake manifold) and insert a feeler

gauge between the top of the tappet screw and bottom of the valve stem while

the engine is running. The valve tappets should be adjusted to a feeler gauge

clearance of .006" on the intake valves and .008" on the exhaust valves. The

tappet screw locking nut should be tightened securely after adjustment. The

tappet clearance is important and should be set accurately to the recommended

dimensions.

The valve timing is determined by the meshing of the crankshaft and

cam-shaft gears. The tooth of the crankshaft gear with the punch mark on the

front face should mesh between the two punch marked teeth of the camshaft

gear.