ENGINE MECHANICAL
-
Compression Check
[B
and 38]
EM-27
I
the
then
maxi-
lh the
ust
so
COMPRESSION
CHECK
[B
and 38]
HINT: lf
there
is lack of
power,
excessive oil consumption
or
poor
fuel economy,
measure
the cylinder compression
pressure.
WARM
UP
AND
STOP
ENGINE
REMOVE
GLOW
PLUGS
(See pase
EM-31)
NOTICE: Make
sure
the load wire
is not
grounded.
CHECK CYLINDER COMPRESSION
PRESSURE
(a)
lnstall
SST
(gauge
adapter) to the
glow
plug
hole.
ssr 09992
-mo24
(b)
Connect
SST
(compression
gauge)
to SST
(gauge
adapter).
ssr 09992-@024
(c)
Fully
open the throttle
valve.
(d)
While cranking the engine
with
the starter,
measure
the compression
pressure.
HINT: Always
use
a fully charged battery to obtain engine
revolutions
of
more than 25O
rpm.
(e)
Repeat
steps
(a)through (d)for
each cylinder.
Compression
pressure:
3O.O
kg,/cm2
(427 pst'
2'942 kPa) or more
Minimum
pressure:
2O.Okg/cm2
(284 psi,
1,961 kPa)
Difference between each cylinder:
2.Okg/cm2
(28 psi,
196 kPa)or less
(f)
lf the cylinder compression
in
one or
more
cylinders
is
low,
pour
a
small
amount of engine oil
into
the
cylinder through the
glow plug
hole
and
repeat
steps
(a)through (d)for
the cylinder
with low
compression.
o
lf
adding oil
helps
the compression,
chances are
that the
piston
rings andlor cylinder bore are
worn
or damaged.
o
lf
pressure
stays
low,
a valve
may
be sticking or
seating improperly, or there
may
be
leakage
past
the
gasket.
4. INSTALL
GLOW
PLUGS
(See page
EM-50)
1.
2.
3.
)y
the
ccele-
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