tacting
the rod sphere, must
be
also replaced. The clearance in
the
tappet-to-tappet guide
co
njunction must not be
greater
than
0.10 mm.
If
the clearance exceeds the specified figure, replace the tappet.
Valve
Timing
Drive
Pinions
The backlash
in
the pinions should be checked
during
engine dis-
mant
ling as \\'ell as during replacement
of
the pinions.
On a new engine, the backlash
mu
.s
t be within 0.
03
to 0.08 mm.
In
sen·icc, the maximum permissible backlash must not exceed
0.2
mm
.
If
the backlash
is
too large,
it
is
permissible to replace any
oi
the pinions. Howeyer, il is better to replace the both pinions
at
a
time since the pinions are
fa
ctory-coupled forming a single set.
The
burrs
and dents,
if
any, should
be
thoroughly trimmed with
a need
le
file.
Camshaft
Carefu
ll
y inspect the
camshaft
that
has been washed
and
wiped
dry.
If
the camshaft has scores at its cams, worn or pitted (crumb-
led) surfaces,
it
must be replaced. Check the ball
bearings
for
good
condition, replace them,
if
found to
be
defective.
Repairing
the
Lubric.
ation
System
The lubrication system should
be
checked and,
if
necessarv,
re
-
paired in the case
of
total disassem
bl
y
of
the engine
and
whe-
n
the
lack
of
oi
l
is
observed
during
engine operation.
Oil Pump
Thoroughly wash the o
il
pump, for which purpose immerse
the
pump housing
in
kerosene and rotate the
shank
of
the driving
gear.
In the pump
that
has been subjected to washing, the
gears
mu
st
rotate freel
y,
without seizing.
After
washing
the pump, check the reducing valve for
air-tight-
ness.
If
the pressure
in
the space ahead
of
reducing valve is 3.5 kgf/cm
2
•
the l
eakage
from the
slant
channel may
lak
e place
in
the form of
drops (the valve is closed);
if
the pressure
in
the space ahead
of
reducing valve is 3.8
to
4.5 kgf/cm
2
,
at
a
1000
r.p.m. speed
of
the
oi
l pump, the valve
must
be
opened.
The valve is to be checked twice under the specified conditions.
The reducing valves
that
fail to comply with the test condit
ions
specified above, must be overhauled and then tested
again
. If neces-
sary, the plunger,
spring
and
the housing of lhe oil pump should be
replaced.
5
1953.
65
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