ENGINE
CYLINDER BLOCK ASSEMBLY
l-Front
plate
2-Cylinder block
3-0il
seal
case
4-0il
seal
5-Bearing
cap,
No.1
6-Cap bolt
7-Main bearing,
No.1
8-Main bearing, flanged,
No.3
9-Cap side
seal
Cylinder block assembly - Exploded view
Cylinder block
The material
of
the block
is
a special cast iron
whose composition
is
carefully controlled
to
present surfaces adapted to sliding
contact
with
pistons.
In
other
words, liners are
not
used in
this block.
Four
ribs are cast
out
of
the block
for four main bearings,
of
which
No.3
bearing
is
flanged
to
take up the axial thrust.
These bearings are
of
shell type constructed
according to the tri-metal concept: a sintered
copper alloy (Kelmet type) deposited on the
steel backing, with an overlay
of
a tin-lead alloy
for improved initial wearing-in action. The whole
surface
is
flash-plated,
The bushing supporting the front journal
of
camshaft
is
a special copper alloy deposited on
the backing, (The early production
of
this engine
is
not
equipped with this bushing,)
\ -
()
o
(
o
-=-
No.3
bearing
as
thrust-and-journal bearing
Crankshaft
The crankshaft
is
a carbon-steel
preCISIOn
forging, whose sliding-contact surfaces at jour-
nals, crankpins and sealed portions are induction-
hardened.
It
is
an integral piece, well-balanced
and shaped for high rigidity.
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