CHAPTER 5 OVERHAULING INSTRUCTIONS
1.
GENERAL INSTRUCTIONS
1)
At
present
we
cannot
say
when your Model
40050
Engine should
be
put
to
a
thorough overhauling,
for
it
presupposes
under what conditions the engine will
be
sued,
but
can
mention
as
general
hints the following
cases
where
an
overhauling
is
required.
a)
When, engine parts having
been
uniformly
fatigued (or worn) down from long
use,
involving a drop
of
output,
it
is
judged better
to
overhaul
it.
b)
When
an
increase
of
blow-by out
of
crankcase
has
caused
a notable drop
of
engine output.
c)
When
oil consumption
has
increased.
d)
When,
with
nothing wrong
with
oil system, a remarkable drop
of
oil
pressure
is
noticed, which
is
judged ascribable
to
the wear
of
metals, etc.
e)
When
water
leaks
into
oil.
f)
When
such
a serious trouble
has
happened inside the engine that cannot
be
remedied
by
usual
services
or permits the replacement
of
broken
or
affected
assemblies.
2)
In taking apart the main parts
such
as
pistons, connecting rod,
valves
and metals,
arrange then
or
put
numbers on them in
an
appropriate way
to
place them later
where they were. Remember particularly
that
caps
on connecting rod and main
bearings, being machined in pairs with respective bodies, cannot
be
replaced
separately.
3)
When
the engine overhauled, make every
service
specified in "Retular Checkup
and
Service Table".
4)
After
a thorough overhauling, practice
an
adequate running-in and performance
test on bench, coupling
it
with
a dynamometer,
so
as
to
adjust
it
perfectly
for
actual operation,
for
example, on the vehicle.
For
fuel injection pump
and
governor, they must
also
be
tested,
when
overhauled, individually on a fuel injection pump tester in order
to
make
necessary
adjustments. New units supplied in
an
integral assembly, "injection pump
general
ass'y",
can
be
readily
put
in
service,
as
already adjust thoroughly. For informations
about the engine
bench
test
and
individual adjustment
of
injection pump
and
governor,
ask
your
dealer or
service
shop.
5)
Reference
to
"Parts Catalogue" will greatly help you in knocking down
and
-
69-
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