Mitsubishi Eclipse Workshop Manual page 30

"11-8
ENGINE
-
Engine Adjustment
Probable
cause
Vacuum gauge reads under standard
value but oointer is
stable.
r
Delayed
ignition timing.
o
Adtust ignition timing.
Vacuum gauge Pointer fluctuates
slowly.
o
Check
fuel injection
system.
o
Check
fuel injection
system.
Vacuum gauge reading
decreases
irregularly.
Vacuum oauqe pointer decreases about
4.O-21.5
kpä
(30-
160
mmHs.
1.1
8-
6.30 in.Hg) intermittently.
.
Burned.
warped
or pitted
valves.
o
Install new
valves.
Vacuum qauqe pointer
suddenlY
decreaseJ
auöui gg.g kpa (250
mmHg,
9.84
in.Hg)
from standard
value
and
then returns.
o
lnstall new cylinder head
gasket.
.
Blown cylinder head gasket.
IASH
ADJUSTERS CHECK
NOTE
Soon after
the
engine
is
started
or
while
it
is
running.
abnormal noise (clattering) which may be
aftributed
to
the
adjuster sounds
but
does
not stop. ln this
case. check the
following.
(1)Checkthe
engine oil, and relill or
replace
oil if
necessary.
NOTE
o
lf the oil amount is small. air
will
be sucked from the oil
strainer and mixed in the
oil
passage.
lf the oil amount is
excessive.
the oil
will
be stirred by
the crank and
mixed
with a
large amount of
air.
Air and oil can not
be separated easily in the deterio-
rated
oil.
and
the
amount
of air
mixed
in the
oil
increases.
lf
such mixed-in air enters the high pressure chamber
in
the lash adjuster, the air
in
the high-pressure
chamber
will
7ENO393
be compressed white the valve ir
op"n.ä];Ä;
ffi';i;i"O
will
be
excessively compressed and abnormal noise
will'be
produced when the valve is closed.
This is
the same phenomenon which
occurs when the
valve clearance
is
improperly adjusted
to
be
excessively
large.
..:.
However, it
will
return
to
be normal if the air entrapped
in
7
the adjuster is
released
in this
case.
(2)
Start the engine, and slowly
race'
it several times (10 times
or
less.)
lf the abnormal noise is eliminated by racing the engine it
means
that the air
is
released
from the
high-pressure
chamber
of the lash adjuster and the function of the
lash
adjuster is returned
to
normal.
'
Gradually increase
the
engine speed
from the
idle
speed
to 3,000 r/min. (for 30
seconds). and
then
C
gradually slow down the engine to the idling speed
(for
I
30
seconds).
PWUE9o|0
o