Datsun C210 series Manual page 189

Manual Transmission
TROUBLE DIAGNOSES
AND
CORRECTIONS
Condition
Difficult
to inter mesh
gears
Causes for difficult
gear
shifting
are
classi
fied
to
troubles
concerning
control
system
and
transmission
When
gear
shift lever
is
heavy
and it is
difficult
to
shift
gears
clutch
disengagement
may also be unsmooth
First
make
sure
that clutch operates
correctly
and
inspect
transmission
Gear
slips
out
of mesh
In
most cases
this
trouble
occurs
when
check ball and
or spring
is
worn or weaken
ed
or
when
control system
is
faulty
In this
case
the
trouble
cannot
be
correct
by
replacing
gears
and therefore trouble shoot
ing must
be carried
out
carefully
It should
also be noted that gear
slips
out of mesh
due
to
vibration generated by weakened front
and
rear
enigne mounts
Noise
When noise
occurs
with engine idling and
ceases
when clutch is
disengaged
or
when
noise
occurs
while shifting
gears
it is
an
indication that the
noise is
from
trans
mission
Transmission
may
rattle
during engine
idling
Check air
fuel
mixture and ignition
timing
After above
procedure readjust
engine
idling
Probable
cause
Worn gears
shaft
and
or
bearing
Insufficient
operati
g stroke due
o
worn
or
loose
sliding
parI
Worn
or
damaged synchronizer
Worn
check
ball
and
or
weakned
or
broken
spring
Worn fork rod ball groove
Worn
or
damaged bearing
Worn
or
damaged
gear
Insufficient
or
improper
lubricant
Oii leaking
due
to damaged
oil
seal
or
sealant
clogged
breather
etc
Worn
bearing High humming occurs at a
high speed
Damaged bearing
Cyclic knocking sound
occurs
also
at
a
low
speed
Worn
spline
Worn
bushing
MT18
Corrective
action
Replace
Repair
or
replace
Replace
Replace
Replace
Replace
Replace
Add oii
or
replace with
designated oil
Clean
or
replace
Replace
Replace
Replace
Replace
as a rear ex
tension assembly