Removmg Refitting - Datsun 320-U Service Manual

Removing and
Refitting Valve Guides
Remove the
cyhnder
head
Remove the
appropnate valve and
spnng
Rest the
ylmder
head with
Its
machmed face downwards
on a
clean
surface and dnve the
gUIde
downward
mto
the combustion
space wIth
a
dnft
ThIS
should
take the form of
a
hard
ened
steel punch See
Fig 8
When
fIttmg
new
valve
guides
these
should be dnven
m
from the
top
of the
cyhnder
head
0
Fig
8
Hardened Steel Punch
Renewing
a
Valve
Spring
in Position
Fig 7
Renewmg
a
Valve Glade
In
an
emergency
a new
valve spnng
can
be fitted wIthout removmg the
cyhnder
head
When
domg
thIS the
apphcable
pIston
must
be
brought to ItS
T D C
posltJon
to
ehmmate any
posslblhty
of the
valve
falhng mto
the
cylmder
Remove the
spark plug
from
the
cyhnder
concerned
Hold the valve
onto Its
seahng
WIth the aId of
a
sUItable
tool such
as a
bent
screwdnver WhICh
WIll
pass
through the sparkmg plug
onftce and locate
on
the valve head
By
usmg the rocker
shaft
as a
fulcrum pomt the
spnng
can
be
compressed
WIth
two
screwdnvers
or a
fork
ended bar
WlthClraw
the valve
cotters
and
renew
the
valve spnng
25