1930 Cadillac Brochure Front Cover - GM Heritage Center

cess oil to drain back through the piston into the crankcase. The
wrist pin which connects the piston to the connecting rod is locked
to one end of the piston by a set screw. It is free to move in the
other end, thus providing for all expansion which may occur without
distorting the piston.
CONNECTING RODS
The connecting rods, which transfer a maximum thrust of approximately
one and one-half tons per explosion from the piston to
the crankshaft, have been given attention in design and manufacture
commensurate with the importance of their function. The
connecting rods from opposite blocks are set side by side on the
same crank throw. The rods are drop-forged from a special formula
steel to an I section with the web of the I in the plane of lateral
motion. Where stress can be depended upon to remain in one
plane, this shape is the lightest and
strongest available.
The rods are rifle-bored to provide
forced lubrication for the
piston pin. An unusual feature is
the diamond boring of the bearings
in both ends of the rod, insuring
a perfect fit and consequent
Workmen wear special clothes to completely
protect them from the fine stream of sand
uh ich isblown under terrific pressure aga insl
each Cadillac crankcase, removing all scale
and dirt before inspection and machining
long life with quiet operation.
CYLINDER BLOCKS
The Cadillac cylinders
are cast iour en bloc,
Piston pin lubrication is assured by rifle
with detachable heads.
,) , or . in , K ll, p nnC( ' ,i,1R rods '• llro "K h