Datsun 1973 510 Repair Manual page 129

EMISSION CONTROLS AND FUEL SYSTEM 123
Fast Idle
earn
steps
fa
0 0 c
f
ti
Fast Idle
adjustment
Overhaul
wue or
similar
tools
to
clean
Jets fuel
Efficient carburetIon depends greatly
passages
or au
bleeds Clean all Jets and
on
careful
cleamng
and mspectlon dur
valves separately
to
aVOId accidental
m
mg
overhaul
smce
dirt
gum
water
or
terchange
varnish
m
or on
the carburetor parts
are
Check all parts for
wear or
damage
If
often
responsible
for
poor
performance
wear or
damage
IS
found
replace
tlie de
Overhaul
your
carburetor
m a
clean
fectlve parts
EspeCially
check the fol
dust free
area
Carefully
dIsassemble the
lowmg
carburetor
refernng
often to the
ex
1
Check the float needle and
seat
for
ploded
views
Keep
all slmllar and look
wear
If
wear IS
found replace
the
com
ahke parts
segregated
dunng disassembly
plete assembly
and
cleamng to
aVOId aCCidental
m
2
Check the float hmge
pm
for
wear
terchange dunng assembly
Make
a
note
and the
float
s
for dents
or
distortIOn
of all Jet
sizes
Replace
the
float If fuel has leaked
mto It
When the carburetor
IS
disassembled 3
Check the throttle and choke shaft
wash all parts except
diaphragms
elec bores for
wear or an
out
of round condl
tnc
choke
umts
pump
plunger
and
any
tlon Damage
or wear
to
the throttle
ann
other plastic leather fiber
or
rubber
shaft
or
shaft bore Will often
reqUIre
re
parts m
clean carburetor solvent
Do
not
placement of the throttle body These
leave parts
III
the solvent
any
longer than
parts
reqUIre
a
close
tolerance
of fit
wear
IS necessary
to
suffiCiently loosen the de
may
allow
au
leakage whICh could affect
pOSitS
ExceSSive cleamng
may
remove
starting and
Idlmg
the
special
fimsh from the float bowl and
NOTE
Throttle
shafts
and
bushmgs
choke valve bodies
leavmg
these parts
are
not
mcluded
m
overhaul kits
They
unfit for
servIce
Rmse
all parts
m
clean
can
be
purchased separately
solvent and blow them
dry
With
com
4
Inspect
the Idle
mIxture
adJustmg
pressed
au
to
allow them to
au
dry Wipe needles for burrs
or
grooves
Any
such
clean all cork plastIc leather and fiber condItIon
reqUIres
replacement
of the
parts WIth
a
clean lInt free cloth needle
smce
you
wIll
not
be able
to
ob
Blowout all
passages
and Jets With
tam
a
satIsfactory Idle
compressed
air
and be
sure
that there
are
5 Test
the accelerator
pump
check
no
restrIctIOns
or
blockages
Never
use
valves
They
should
pass au one way
but