1968 DATSUN 510 check engine

CON1EN1S

CHAPTER
ONE

GENERAL
INFORMATION

Introduction

Model
Identification

CHAPTER
TWO

PERIODIC

MAINTENANCE

RoutIne
checks

Pen
odic
checks

CHAPTER
THREE

TROUBLESHOOTING

EqUIpment

Starter

ChargIng
system

EngIne

Igmtlon

system

Fuel

system

Exhaust

emIssIon
control

CHAPTER

FOUR

ENGINE
AND
IGNITION
TUNE
UP

EqUIpment

Battery

Spark
plugs

DIstrIbutor

Igmtlon

timIng

CHAPTER
FIVE

ENGINE
LUBRICATION
SYSTEM

Descnptlon

Lubncation

cIrcuIt
SpecIficatiOns
and
dImensIons

EngIne
lubncation
and

maIntenance

Recommended
lubncants

Clutch

TransmIssiOn

Brakes

Steenng
and

suspension

TIre
wear

analysIs

Wheel

balancIng

Idle

speed
and
Idle

mIXture

Dwell

angle
setting

CompressIon
test

Valve
clearance

adjustment

AddlllOnal
checks

Oil

pump
I

6

t
1

4

V

9
t

1

20

27

II

CHAPTER
SIX

ENGINE

Cylmder
block

Crankshaft

PistOns
and

connectmg
rods

Cyhnder
head

Camshaft

Valve
mechamsm

Camshaft
dnve

Mamfolds

011

pump

Fuel

pump
Carburetor

Emission
control
devIces

Engme
removal

Engme
dISassembly

Pistons
and

connectmg
rods

Cyhnder
head

Engme
mspectIon
and

replllr

Engme
reassembly

Service
data
and

speCifications

CHAPTER
SEVEN

FUEL
SYSTEM

Air
cleaner

Fuel
strlllner

Fuel

pump
Carburetor

Fuel
tank

1
CHAPTER

EIGHT

COOLING

SYSTEM

DescnptIon

Water

pump

Fan
clutch
Thermostat

Radiator

CHAPTER
NINE

ENGINE

ELECTRICAL
SYSTEM

Starter

Overrunmng
clutch

assembly

ChargIng
ClrcUlt

Alternator

Alternator

output

Voltage
regulator
DIstrIbutor

Condenser

Igrntlon
cod

SpeCifications

Spark
plugs

CHAPTER

TEN

EMISSION

CONTROL

SYSTEM

Exhaust
emiSSIOn

control

Crankcase

emission
control

Air

mJectlon
system
Engme
modifications

Evaporative
emiSSion
control

Exhaust

system

CHAPTER
ELEVEN

CLUTCH

TRANSMISSION
AND
DRIVESHAFT

Clutch

TransmissIon

Master

cyhnder
TransmissIon
data
and

speCIfications

Operating
cyhnder
Dnveshaft

Withdrawal
lever

adjustment
Dnveshaft
data
and

speCIfications

Clutch

system

bleedmg
Automatic
transmIssIon
checks

Clutch
data

and

speCIfications
31

62

84

91

114

127

CHAPTER
TWO

PERIODIC
MAINTENANCE

To
ensure

good
performance
dependability

and

safety
regular
penodlc
maintenance
is

necessary
TIns

chapter
outlInes
routine

and

penodlc
mamtenance
for
the

average
dnver

Under

heavy
usage
semcmg
mtervals
will
be

shortened

Regular
routme
mamtenance
will

help
aVOId

expensive
repaIrs

ROUTINE
CHECKS

The

followlDg
checks
should
be

performed
at

each
fuel

stop

1
Check

engme
oil
level

Top
up
as

requrred

2
Check
radiator
coolant
level

Top
up
as
re

qwred

3
Check

battery
electrolyte
The

battery
case

IS
marked
With

upper
hrmt
and
lower
lnmt
lInes

Level
should
be
maID
tamed

between
the
IIDes

4
Check
that
the
master

cylInder
brake
flwd

reservOir
level
IS
between
the
max
and
mm

lInes
marked
on
the

plastic
case

S

Check
the

plastic
clutch

cyhnder
reservoir

level
Level
should
be
between
the
max
and

mm
lInes

6
Check
the
windsh1eld
washer
flwd
reservoir

Top
up
as

required
7
Check
tire

pressures
when
the
tIres
are
cold

Front
and
rear
tire

pressures
should
be
24

pounds
under
normal

dnving
conditions
TIre

pressure
should
be
28

pounds
for

h1gh
speed

dnvmg
conditions

8
Check
the

engIne
for

general
conditIon

Check
for

leaky
or
cracked
hoses
and
loose

wmng

9
Check
condition
of
wmdshleld

wiper
blades

PERIODIC
CHECKS

Table

1

prOVIdes
penodIc
checks
and
main

tenance
that
should
be

performed
on
a
set

schedule
Table
2

gIves
recommended
lubncants

and
Table
3

specIfies
the

grades
of
oil
that
should

be
used
Procedures
for

performmg
the
semces

are

presented
ID
vanous

chapters
of
tlus
manual

Table
3
RECOMMENDED
GRADES
OF
OIL

Temperature
Engine
on

MS

Above
32
C
90

F
average
SAE
30
IOW
30

32
to
0
C
90

to
32

F
mlmmum
SAE
20
20W
IOW
30

O
to
12
C
32
tolO

F
mlRlmum
SAE
IOW
IOW
30

Below
12
C
10
F
mlmmum
SAE
lOW
IOW
30

PERIODIC

MAINTENANCE

7

Table
1
ENGINE

LUBRICATION
AND
MAINTENANCE

FREQUENCY
EVERY

E
E
E

E

E
E

E
Eo
00
00

00
00
00

00

00

gq
00

00

00

NO

t
r61li
0

CD

Check

engine
011
level

top
up
If

required
X

Change
engine
011
X

Lubricate

carburetor

hnkage
X

Lubricate
distributor
rotor
shaft
and
ann
shaft
X

Apply
grease
to
distributor
cam
heel
X

Check

radiator
coolant
level
X

Change
radIator
coolant
X

Change
radiator
coolant
additive

X

Check

battery

electrolyte
level
X

Check

specific
gravity
of

battery
X

Check

engine
starting
exhaust
color
X

Tighten

cyhnder
head

manifolds
and

pipe
flanges
X

Adjust
valve
clearance

X

Check

Ignition
timing
X

Tighten
carburetor

fittings
X

Check
fan
belt
tension
X

Check
for
011

pan
leakage
X

Tighten
engine
mounts
X

Check
fuel
strainer
X

Replace
fuel
strainer
X

Check
for
fuel
leaks
X

Replace
011
filter
X

Check

spark
plugs
X

Replace
spark
plugs
X

Check
dlstnbutor

cap
rotor
and

POints
X

Adjust
engine
Idle

speed
X

Check

air
cleaner

fittings
X

Clean
011
filler

cap
X

Clean

battery
cables
and
terminals

X

Check
alternator
and

voltage
regulator
function

X

Check

starter
motor
function

X

Replace
aIr
cleaner
element

X

Check
fuel

pump
function

X

Check

cyhnder

compressIon
X

Clean
carburetor

Jets
and
float
chamber

X

Check
dlstnbutor
condenser

X

Check
crankcase
ventilation
control
valve
X

10
CHAPTER
THREE

pressure
bUllt

up
In
each

cylInder
The

readIngs

when

properly
Interpreted
IndIcate

general
cyl

Inder
and
valve
condltlOn

Vacuum

Gauge

The
vacuum

gauge
IS

easy
to
use
but
dIfficult

for
an

Inexpenenced
mechanIC
to

Interpret
The

results
when
conSIdered
WIth
other

findIngs
can

prOVIde
valuable
clues
to

pOSSIble
trouble

Connect
the
vacuum

gauge
WIth

a
T
connec

tIon
In
the
hose
from
the
carburetor
to
the

vacuum
advance
on
the
dIstnbutor
Start
the

engme
and
let
It
warm

up
thoroughly
Vacuum

readIng
should
be

steady
at
18
22
Inches

NOTE
Subtract
1
Inch

from

reading

for

every
1000

feet
of
altitude

Figure
1
shows
numerous

tYPical
readIngs

WIth

InterpretatIons
Results
are
not
conclusive

WIthout

companng
to
other
tests
such
as
com

preSSIOn
readIngs

Fuel
Pressure

Gauge

ThIS
Instrument

IS
VItal
for

evaluatIng
fuel

pump
performance
Often

a
vacuum

gauge
and

fuel

pressure
gauge
are
combIned

Dwell
Meter

A
dwell
meter
measures
the
dIstance
In
de

grees
of
cam
rotatIon
that
the
breaker

pOInts

remaIn
closed
while
the

engme
IS

runnIng
SInce

thIS

angle
IS
determmed

by
breaker

pOInt
gap

the
dwell

angle
IS
an
accurate
IndIcatIon
of

pOInt

gap
Many
tachometers
Intended
for

tunIng
and

testIng
Incorporate
a
dwell
meter
as
well
Follow

the
manufacturer
s
InstructIon
to
measure
dwell

on
the
Datsun

Tachometer

A
tachometer
IS
essential
for

tunIng
Datsuns

WIth
exhaust
emission
control
deVices

IgmtIOn

turung
and
carburetor

adjustments
must
be

per

formed
at
the

specified
Idle

speed
The
best
In

strument
for
thIS

purpose
IS
one
WIth

a

range
of

0
1
000
or
0
2
000

rpm
Extended

range
0

6
000
or
8
000
Instruments
lack

accuracy
at

lower

speeds
The
InStrument
should
be

capable

of

detecting
changes
of
25

rpm
Stroboscopic
Timing
Light

ThIS
Instrument

pernuts
accurate

IgnitIon

tImIng
By
f1ashmg
a

bght
at
the

preCISe
Instant

cylInder
No
1
fires
the

posItIon
of
the
crank

shaft

pulley
at
that
Instant

can
be
seen
Marks

on
the

pulley
bne

up
With

a
reference

pOInter
on

the
block

dunng
the

tIming
procedure
SUltable

bghts
are
neon
bulb

types
and
xenon
strobe

hghts
Neon

tunmg
bghts
are
ddticult
to
see
and

must
be
used
in

dImly
bt
areas
Xenon
strobe

bghts
can
be
used
In

bnght
sunbght
Use
the

bght
accordIng
to
the
manufacturer
s
InStruC

tIons

Exhaust

Analyzer

Of
all
Instruments
descnbed
here
this

IS
the

least

bkely
to
be
owned

by
a
home
mechanic

One
Instrument

samples
the
exhaust

gases
from

the

taIlpIpe
and
measures
the
thermal
conduc

tIVIty
of
the
exhaust

gas
SInce
different

gases

conduct
heat
at

varYIng
rates
thermal
conduc

tIVIty
of
the
exhaust
IS

a

good
IndIcatIon
of

gases

present
This
Instrument
IS
VItal
for

accurately

checkIng
the
effectIveness
of
exhaust
emIssion

control

adjustments
but
IS
too

expenSIve
for
an

amateur
mechanIC
to
conSIder

buying

STARTER

Starter

system
troubles
are

relatIvely
easy
to

ISolate
The

followmg
are
common

symptoms

and
cures

1

Engme
cranks

very
slowly
or
not
at
all

Turn
on
the

headhghts
If
the

bghts
are

very
dun

most

likely
the

battery
or
the

connecting
WireS

are
at
fault

Check
the

battery
using
the

pro

cedures
descnbed

in
the
Tune

up
chapter
Check

wmmgfur
e
s
wom
andd
connectIom

H
the

battery
and

connectIng
WIres
check

good
turn
the

headlIghts
on
and

try
to
crank
the

engIne
H
the

lIghts
dIDl

drastIcally
the
starter
is

probably
shorted
to

ground
Remove
the
starter

and
test
it

usmg
the

procedures
gIven
in

Chapter

NIne
If
the

lights
remain

bnght
or
dun

slIghtly

when

crankIng
the

engme
the
trouble

may
be
in

the
starter
solenOId
or

wmng
To
ISolate
the

trouble
short
the
two

large
solenoid
ternunals

together
not
to

ground
if
the
starter
cranks

normally
check
the
solenoid
and

wmng
up
to
the

12
CHAPTER
THREE

13
IMPROPER
IDLE

MIXTURE

Roats

slowly
between

13
17
14
SMALl
SPARK

GAP
or
DEFECTIVE

POINTS

Slight
float
between

14
16

ignItIOn
switch
If
the
starter
still
fails
to
crank

properly
remove
the
starter
and
test
it

2
Starter
turns
but
does
not

engage
with

engine

This
trouble
is

usually
a
defective

pInion
or
sole

noid

shlfting
fork

It

may
also
be
that
the
teeth

on
the

pInion
flywheel
ring
gear
or
both
are

worn
down
too
far
to

engage

properly

3
Starter

engages
but
will
not

dISengage
when

IgmtlOn
switch
IS
released

TIns
trouble
is

usually
caused

by
a

sticking
sole

nOid
but

occasionally
the

pmlOn
can

jam
on
the

flywheel
With
manual
transmissions
the

pinion

can
be

temporanly
freed

by
rockmg
the
car
in

high

gear
Naturally
this
IS
not

poSSible
in
auto

matics
the
starter
must
be
removed

4
Loud

grinding
noISes
when
starter
runs

TIns

usually
means
the
teeth
on
the

pinion

and
or

flywheel
are
not

meshing
properly
It

may
also
mean
the
over

running
clutch
IS
broken

In
the
first
case
remove
the
starter
and

examine

the

gear
teeth
In
the
latter
remove
the
starter

and

replace
the

pmion
dnve

assembly

CHARGING
SYSTEM

Charging
system
troubles

may
be
in
the
alter

nator

voltage
regulator
or
fan
belt
The
follow

ing
symptoms
are

typical

1
Alternator

warning

lamp
does
not
come
on

when

IgmtlOn
is

turned
on

This

may
indicate
a
defective

ignition
switch

battery
voltage

regulator
or

lamp
Frrst

try
to
15
HEAD
GASKET

LEAK

Roats
between
5
19
16
RESTRICTm

EXHAUST
SYSTEM

Normal
when
first

started

Drops
to
0
as

rpm
Increases

May

eventually
rrse
to

about
16

start
the
car
If
it
doesn
t
start
check

the

igllltlon

sWitch
and

battery

If
the
car
starts
find
the

voltage
regulator
and

disconnect
the
wlute
red
Wire
this
is
the

lamp

wire
Ground
the

wire
If
the

lamp
hghts
the

voltage
regulator
is
defective
not

properly

grounded
try
tightening
the

mounting
screws

or
the
alternator
brushes
are
not

contactmg
the

commutator
If
the

lamp
does
not

light
when
the

wire
IS

grounded
the

lamp
is

probably
burned

out

replace
It

2
Alternator

warning
lamp
comes
on
and

stays
on

This

usually
mdicates
that
no

chargmg
is

takmg

place
Frrst
check
the
fan
belt

tension
and

adlust

if

necessary
Check
the

battery
condition
with

the

hydrometer
and
check
all
electrical
connec

tions
m
the

chargmg
system
Fmally
isolate
the

trouble
to
the
alternator
or

voltage
regulator

3
Alternator

warmng

lamp
flashes
erratically

This

usually
indicates
the

chargmg
system
is

workmg
intermittently
Check
the
fan
belt
ten

sion
and
all
electncal
connections
m
the

charg

ing
system
Check
alternator
brushes
and
cODlh

tlon
of
the
commutator

4

Baltery
reqUires
frequent
additiOns

of
water

or

lamps
require
frequent

replacement

The
alternator
IS

probably
overchargmg
the
bat

tery
The

voltage
regulator
is

probably
faulty

check
it

using
the

procedures
given
in

Chaper

Nme

5
ExceSSive

noISe

from
he
alternator

Check
for
loose
alternator

mountmg
The

TROUBLESHOOTING
13

trouble

may
also
be
worn

bearings
Remove
the

alternator
and

repair

ENGINE

These

procedures
assume
the
starter
cranks

the

engme
over

normally
If
not
refer
to
Starter

section
m
this

chapter

1

Engme
won
t
start

Could
be

caused

by
the

IgOltlon
or
fuel

problems

First
determine
If

high
voltage
to

spark
plug

occurs
To
do
thiS
dISconnect
one
of
the

spark

plug
wires
Hold
the

exposed
wrre
termlOal
y
to

Y2
lOch
from

ground
any
metal
in

engine
com

partment
With
an
msulated
screwdriver
Crank

the

engme
over
If

sparks
do
not

Jump
to

ground

or
the

sparks
are

very
weak
the
trouble

may
be

10
the

IgnitIOn
system
See

Ignition
System
Trou

bleshootmg
to
further
check
If

sparks
occur

properly
the
trouble

may
be
10
the
fuel

system

See
Fuel

System
Troubleshootmg

2

Engme
misses

steadily

Remove
one

spark
plug
wrre
at
a
tune
and

ground
the
wrre
If

engme
mISs
increases
that

cyhnder
was
work

109
properly
Reconnect
the

wire
and
check
the
others
When
a
wire

IS
dIs

connected
and

engme
miss
remams
the
same

that

cylinder
IS
not

finng

Check

spark
as
descnbed
10

Step
1
If
no

spark

occurs
for
one

cyhnder
only
check
dlStnbutor

cap
wrre
and

spark
plug
If

spark
occurs

prop

erly
check

compressIOn
and
mtake
maOlfold

vacuum
to
ISolate
the
trouble

3

Engme
misses

erratlcally
at
all

speeds

Interrmttent
trouble
can
be
difficult
to
find
It

could
be
ill
the

Ignition
system
exhaust

system

or
fuel

system
Follow

troubleshooting
proce

dures
for
these

systems
carefully
to
isolate
the

trouble

4

Engme
misses

at
Idle

only

Trouble
could
exist

anywhere
ill

IgOltlon
system

Follow

Ignition
TroubleshootlOg
procedure
care

fully
Trouble
could
also
eXist
10
the
carburetor

Idle
crrcult
Check
Idle
mIXture

adjustment
and

check
for
restnctions
m
the
idle
crrcUlt

5

Engme
misses
at

high
speed
only

Problems
could
be
ill
the
fuel
or

IgOltlon
systems
heck
accelerator

pump
operation
fuel

pump

dehvery
fuel
hnes
etc
as
descnbed
under
Fuel

System
Troubleshootillg
Also
check

spark
plugs

and
wrres

6
Low

performance
at
all

speeds
poor

acceleratIOn

Trouble

usually
ill

IgOltlon
or
fuel

system
Check

each
With
the

appropnate
troubleshooting
pro

cedure

7
ExceSSive

fuel
consumptIOn

Could
be
caused

by
a

Wide

variety
of

seemmgly

unrelated
factors
Check
for
clutch

shppage

brake

drag
defective
wheel

beanngs
or

poor

front
end

alignment
Check

IgOltlOn
system
and

fuel

system

8
011

pressure
lamp
does
not

light
when

IgmtlOn

switch

IS
on

Check
the
alternator

warning
lamp
If
it
ISn
t
on

either

go
to

Step
1

Chargmg
System
Trouble

shootlOg
If

only
the
oil

pressure
lamp
IS
off

open

the

englOe
compartment
hd
and
locate
the
oil

pressure
sender
on
the
block
near
the
oil
filter

Make
sure
the
wrre
is
connected
to
the
sender

and

makmg
good
contact
Pull
the
wrre
off
and

ground
it
If
the

lamp
hghts
replace
the
sender

If
the

lamp
does
not

light
replace
the

lamp

9
011

pressure
lamp
lights
or

flickers
when

engme
IS

runmng

Indicates
low

or

complete
loss
of
oil

pressure

Stop
the

englOe
unmedmtely
coast
to
a

stop
With

the
clutch

dISengaged
Tlus

may

simply
be

caused

by
a
low
oil
level
or
an

overheatmg
en

glOe
Check
the
oil
level
and
fan
belt
tensIOn

Check
for
a
shorted
oil

pressure
sender
with
an

ohmmeter
or
a

contlOulty
tester
Remove
and

clean
the
oil

dipstick
and
check
oil
level
and

condition

RepleOlsh
or

replace
the
oil

as
re

qurred
Listen
for
unusual
nOISes

mdlcatmg
dam

aged
beanngs
etc
Do
not
re
start
the

engine

until

you
know

why
the

hght
went
on
and

are

sure
that
the

problem
has
been
corrected

IGNITION
SYSTEM

This

procedure
assumes
the

battery
IS
ill

good

enough
condition
to
crank
the

engme
at
a

normal
rate

TROUBLESHOOTING

15

5

Stumbling
when

acceleratmg
from
Idle

Check

accelerator

pump
diaphragm
and
Idle

speed
adjustment

6

Engine
mISses
at

hIgh

speed
or
lacks

power

This
mdlcates

pOSSible
fuel
starvatIon
Check

fuel

pump
pressure
and

capacIty
Clean
main

Jet

and
float
needle

valve

7
Black
exhaust
smoke

Black
exhaust
smoke
means
a

badly
ovemch

nuxture
Check
Idle

mIXture
and
Idle

speed
ad

Justment
Check
for
excessive
fuel

pump
pres

sure
or
blocked
return
hne
from
carburetor

to

fuel
tank
Check
for

leaky
float
or
worn
needle

valve

8
ExceSSIve

fuel

consumptIOn

ThIS

may
be
another
mdIcatIon
of

an
ovemch

fuel
mixture
Check
that
automatIc
choke

oper

ates

If
so

eqUIpped
or
that
the
manual
choke

contraIlS
not

being
left
out
Check
Idle
mIXture

and
Idle

speed
Check
for
excessIve
fuel

pump

pressure
leaky
float

or
worn
needle

valve
Make

certam
that

jets
are
the

proper
SIZe

Fuel

Pump
Pressure

Testing

1
Install
a
T

fittmg
m
the
fuel
hue

close
to
the

carburetor

2
Connect
a
fuel

pressure

gauge
to
the

fittmg

WIth
a
short
tube

3
Check
fuel

pump
pressure
as
described

in
the

Fuel

System
chapter

EXHAUST
EMISSION
CONTROL

The

followmg
symptoms
as
ume

you
have
ad

justed
the

Ignition
and
carburetor

to

specdicatIon

and
that

you
have
checked

the
results
on
an

accurate
exhaust

gas
anajyzer

1
CO

content
too
low

Make

sure
Idle

speed
IS
not
too
low
Check
Idle

mIXture

adjustment
too
lean
Check
carbu

retor

Jets
and

channels
Clean
and
or

replace
as

necessary
Check

engme
condition
With
a
com

pressIOn
and
vacuum
test

2
CO
content
too

hIgh

Check
Idle
mixture

adjustment
too

nch
Check

for

dIrty
air
cleaner

and
defectIve

automatIc

choke
If
so

equipped
Check
carburetor

Jets
and
channels
Clean
and
or

replace
as

necessary

Check

engme
condItIon
WIth

compression
and

vacuum
test

3

Hydrocarbon
level
too

hIgh

Check
that

Idle

speed
and
mIXture

adjustments

are

to

specIfication
Check

spark
plug
condItIon

and

gap
Check
breaker

pomts
Check

IgnItIon

tnumg
too

early
Check
mtake

mamfold
for

leaks
Check

valve
clearance
too

small
Check

condItIon

of
valves
With

compressIOn
test

MANUAL
CLUTCH

1

SlIppage

ThiS

is
most

noticeable
when

acceleratIng
m
a

hIgh
gear
at

relatIvely
slow

speed
To

check

slip

page
park
the
car
on

a
level
surface

WIth
the

handbrake

set
ShIft
to
2nd

gear
and
release
the

clutch

as
If

drlVing
off
If
the

clutch
is

good
the

engme
will
slow
and
stall
If
the

clutch

shps
con

tInued

engme
speed
will

gIve
It

away

CAUTION

ThIS
IS
a
severe

test

Perform

only

when

slippage
IS

suspected
not

penodlcally

Shppage
results
from
IDSufliclent
clutch

pedal

free

play
all
or

grease
on
the

clutch
disc

worn

pressure
plate
or
weak

sprmgs
Also
check
for

bIndIng
m
the
clutch
cable

and
lever
arm
which

may

prevent
full

engagement

2

Drag
or

failure
to
release

ThIS

problem

usually
causes
dIfficult

shIftIng
and

gear
clash

espeCially
when

downshIftmg
The

causes

may
be
excessive
clutch

pedal
free

play

warped
or
bent

pressure
plate
or
clutch
dISC
ex

cessive
clutch
cable

guide
sag
and
broken
or

loose
clutch

lmings
Check
conditIOn
of

mam

shaft

splines

3
Chatter
or

grabbing

A
number
of

thmgs
can
cause

tIns
Check

cable

gUIde
sag
and

tIghtness
of
transnusslOn
to
frame

and

engme
to
transmlSslon

mountIng
bolts

Check
for

worn
or

mISaligned
pressure
plate
and

misalIgned
release

plate

4

Other
nOIses

NOISe

usually
mdlcates
a

dry
or
defective
release

bearIng
Check
the

beanng
and

replace
If
neces