Inspection - Datsun 320-U Service Manual

Disassembling
Inspection
Checkmg
wIth
fuel pump
mstalled
on
engme
Switch off and stop the engme
Disconnect the fuel pIpe
at
the mlet
umon
of
the carburetor and
then turn the engme
with the
crank handle
Now the
gasohne
should be
ejected vlgorounsly
from the
tip of the
pIpe
once
every
two
rotations of
the crankshaft
To
test
the functIOn
of
the pump alone
operation
of
the hand pnmer
and
checkmg
the
fuel ejection
IS
enough
Removal
from
engme
Fuel
pump
can
be easIly
removed
by disconnecting
the mlet and outlet
umons
and
loosenmg
the 2 attachment
nuts
Inspection
pnor
to
dlsassembhng
Pnor
to
dlsassembhng
of the removed pump
measure
the
distance
between
the rocker
arm
and flange
of
the lower
body by means
of
a
scale and
see
If
the
rocker
arm
rocker lmk and pms
are worn
Method
of
dlsassembhng
first
wipe dIrt off
the
outer
surface of the pump and
put
marks
on
both the
upper and lower bodies
to
make their
reassemblmg
easy
It
IS
eaSIly separated
mto
two when
the
fIve
screws
around the
upper
body
are
loosened
Take great
care not to
damage
the
diaphragm
dunng
thiS disassembly
Checking Repaires
of Parts
Wash
the
dIsassembled parts well
m
gasohne
then mspect them
I
Replace
the
dIaphragm
If
any
damage
ImpregnatIOn
by gasohne
Replace
a
valve
assembly
If
any
wear or
faulty
operation
IS
detected
Even
If
repaIrs
are
unavoIdably reqUIred
the hmlt
for
repaIrs of warp
or
wear
of
the valve
IS
0 001
In
When the
surface of the valve
seat or
valve
IS
found
Irregular
remove
the
valve
seat
of
the
outlet and
dress
the surface
with
a
fme oIlstone
In
case
of
Irregulanty
of the
seat
surface of the mlet valve
which
cannot
be
taken off from the
body
recondItion
It
wIth
a
cutter
and
gnndmg
tool
When
the
surface of
the
valve
IS
faulty place some
very
fme gnndmg corn
pound
on
the surface of
a
flat pIece of
glass plate
and
gnnd
It
hghtly
wIth the tip
of
a
finger
The standard thIckness of tbe valve
IS
1 6
mm
The
hole
of the
jomt parts
of
diaphragm
shaft
and lmk
may
be
worn to some
extent
ThIS
IS not senous
but when
senous
eccentnc
wear
crack
or
break
age
IS
found
the
part
must be replaced
As a
remedIal
measure
such
wear can
be compensated
for
at
the
time
of
dlsmanthng
and
reassembhng
of the
body by
msertmg
a
packmg
made of thIck
paper
between the lower body
and
diaphragm
to raise
the relative pOSition of
dIaphragm
shaft WIth respect
to the lower body
The rocker
arm
should be
replace
when
ItS
contact
face WIth the
cam
and
that WIth the
hnk
and
ItS
pm hole are
senously
worn
1
46