check engine MITSUBISHI SPYDER 1990 Service Owner's Manual

ENGINE On-vehicle
Caution
1.Keep away from the spark plug hole when crank-
ing.
2. If compression is measured with water, oil, fuel,
etc., that has come from cracks inside the cylinder ,
these materials will become heated and will gush
out from the spark plug hole, which is dangerous.
6.Set compression gauge to one of the spark plug hole s.
7. Crank the engine with the throttle valve fully o pen and
measure the compression pressure.
Standard value (at engine speed of
1,250 (178 psi)
Limit (at engine speed of
min. 935 (133 psi)
8.Measure the compression pressure for all the cylind ers,
and check that the pressure differences of the cylinders
are below the limit.
Limit:. max. 100
(14 psi)
9.If there’ is a cylinder with compression or a compr ession
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repe at
the operations in steps 7 and
(1) If the compression increases after oil is added , the
cause of the malfunction is a worn or damaged pisto n
ring and/or cylinder inner
(2) If the compression does not rise after oil is added,
the cause is a burnt or defective valve seat,
is leaking from the gasket.
10. Connect the crankshaft position sensor
11. Install the spark plugs and spark plug cables.
12. Use the scan tool to erase the diagnostic
codes,
or disconnect the negative battery cable’ for
than
10 seconds and reconnect it.
NOTE
This will erase the diagnostic trouble code from
the crankshaft position sensor connector being disc on-
nected.
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ENGINE On-vehicle Service
MANIFOLD VACUUM CHECK11100270200
1.Before inspection, set vehicles in the following condition:
lEngine coolant temperature:
lLights, electric cooling fan, and accessories: OFF
l Transaxle: Neutral (P range on vehicles with
2. Set up the tachometer or connect the scan tool t o the
data link connector.
3.Attach a three-way joint to the vacuum hose connect ed
between the intake manifold plenum and the fuel pressure
solenoid valve and connect a vacuum gauge.
4. Start the engine, and check that the curb idle s peed is
within the standard value range.
Standard value: 750
100
5. Check the manifold vacuum.
Limit: min. 60
(18
LASH ADJUSTER CHECK
NOTE
NOTE
If an abnormal noise (rattling noise) probably caus ed by the
If an abnormal noise (rattling noise) probably caus ed by the
lash adjusters is heard and the noise does not
lash adjusters is heard and the noise does not
as follows.
as follows.
1. Check the engine oil, and if required, refuel or replace
it.
NOTE
lIf the amount of the engine oil is insufficient, ai r will
be sucked in from the oil strainer and mix
the oil
passage.
lIf the amount of the engine oil is more than the sp eci-
fied amount, it will be stirred by the crankshaft to
make a lot of air
in the
l If the oil is deteriorated, it will not easily
from air and the amount of air’ mixed in the oil wi ll ,
increase.
If the air which has mixed in the oil due to the ab ove
causes enters the high pressure chamber in the lash
adjusters, the air in the high pressure chamber wil l be
pressurized during opening of the valve, which caus es
the lash adjusters to shrink excessively, and an abnormal
noise will be generated when the valve is closed. T his
is the same phenomenon as the one when the valve
clearance has been excessively adjusted by mistake.
In this case, if the air which has entered the lash adjusters
is bled, things will be normalized.
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ENGINE On-vehicle Service
Timing belt side
.
2.Start the engine and perform gentle racing* several times
(less than times.)
If the abnormal noise stops by racing, the air is b led
from the high pressure chamber of the lash adjusters
and the function of the lash adjusters is normalized.
After raising the engine speed from idling to 3000
gradually (in 30 seconds), drop the
ally (in 30 seconds) to idling.
NOTE
lIf the vehicle is parked on a slope for the oil
in the lash adjusters will be decreased ‘andairmay
enter the high pressure chamber when the
is started.
lAfter the vehicle is parked for long, air may enter
the high pressure chamber because the, oil in the
oil passage will be gone and, it will take a time b efore
the oil is supplied to the lash adjusters.
3.If an abnormal noise does not stop by racing, check the
lash adjusters according to the following procedure s.
Stop the engine.
(2)Set the NG. cylinder of the engine to the compression
top dead center.
(3) Push the rocker arm indicated by the white arro w
mark as shown in the illustration at left and check
whether or not the arm lock goes down.
(4) Turn slowly the crankshaft
(5) Check the rocker arm indicated by the black arr ow mark
as shown in the illustration at left above (3).
(6) If the rocker arm can be lowered easily when th e
part of the rocker arm which is directly above the
top of the lash adjuster is pressed, the lash adjus ter
is defective and should be replaced with a new part .
In the same procedure as step 4, replace the lash
adjuster.
Furthermore, when replacing the lash adjuster, bleed
all of the air from the lash adjuster and then install.
After this, check that there is no problem by check ing
in steps to (5).
NOTE
lA leak-down test can be carried out to accurately
determine whether the lash adjuster is defective
or not.
l For the procedures for the leak-down test and
air bleeding of the lash adjuster, refer to
Furthermore, if the arm’ feels ‘extremely stiff
and cannot be lowered when it is pressed, the lash
adjuster is normal, so investigate for some other c ause
of the abnormality.
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ENGINE -‘Engine Assembly
COMPRESSOR
Disconnect the compressor connector and remove the
compressor from the compressor bracket
the hose
attached.
NOTE
Place the removed A/C compressor in a where it will
not be a hindrance when removing ‘and installing th e engine
assembly, and tie it with a cord:
Caution
Do not bend the joint the A/C hose and the
pipe by force.
ENGINE MOUNT BRACKET ASSEMBLY
REMOVAL
(1) Support the engine with a garage jack.
(2) Remove the special tool which was attached when the
transaxle assembly was removed.
(3) Hold the engine assembly with a chain block or similar
(4) Place a garage jack against the engine oil pan with a
piece of wood in between, jack up the engine so tha t
the weight of the engine is no longer being applied to
the engine mount bracket, and then remove the engin e
mount bracket.
ENGINE ASSEMBLY REMOVAL
After checking that all cables, hoses and harness connectors,
etc., are disconnected from the engine, lift the chain block
slowly to remove the engine assembly upward from th e engine
compartment.
INSTALLATION SERVICE POINTS
ENGINE ASSEMBLY INSTALLATION
Install the engine assembly while checking that the cables,
hoses, and harness connectors are not clamped.
ENGINE MOUNT BRACKET ASSEMBLY
INSTALLATION
(1) Place a garage jack against the engine oil pan with a
piece of wood in between, and install the engine mo unt
bracket while adjusting the position of the engine.
(2) Support the engine with the garage jack.
(3)Remove the chain block and support the engine assem bly
with the special tool.
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ENGINECamshaft and Camshaft Oil
Plastic hammer
sideExhaust side
Slits01
Dowel pins
ExhaustsideIntake side
I
REMOVAL SERVICE POINTS .
EX H A UST
CAMSHAFT SPROCKET
Use a wrench at the hexagonal part of the camshaft
(to prevent the crankshaft from turning) to loosen the
camshaft sprocket bolt.
(2) Remove the camshaft sprockets.
FRONT CAMSHAFT BEARING FRONT CAMSHAFT BEARING
B E A R I N G B E A R I N G
(L.H.) (L.H.)
(1) Loosen the bearing cap installation ‘in two or three
steps.
(2) Remove the bearing cap.
NOTE
If the bearing cap is difficult to remove, use a plastic
hammer to gently tap the rear part of the camshaft, and
then remove.
INSTALLATION SERVICE POINTS
INTAKE CAMSHAFT/EXHAUST CAMSHAFT
INSTALLATION
(1) Install the camshafts on the cylinder head.
Caution
Do not confuse the intake side and the exhaust side .
NOTE
Install new camshafts using the following procedure.
(1) Remove the rocker arms.
(2) Lay the camshafts on the cylinder head and inst all
the bearing caps.
(3)
that the camshaft can be easily turned by
(4) After’ checking, remove the bearing caps and th e
camshafts, and install the rocker arms.
(2) The camshafts dowel pins should be at the posit ions
shown in the figure.

ENGINECamshaft and Oil Seal
CAMSHAFT CAP
C A M S H A F T
BEARING CAP
INSTALLATION
Tighten the bearing cap installation bolts to the torque
in two or three steps.
C a u t i o n
Tighten uniformly, otherwise the rocker arms not
straight.
Camshaft position
Camshaft positionsensor paint
CAMSHAFT OIL SEAL INSTALLATION
Use the special tool to drive the camshaft oil seal into position
carefully.
CAMSHAFT POSITION SENSING CYLINDER/
CAMSHAFT POSITION SENSOR SUPPORT
INSTALLATION
(1) Install the camshaft position sensing cylinder to the end
of the camshaft as shown in the illustration.
(2) Install the camshaft position sensor support.
(3)Check that the identification paint on the
sensing cylinder is pointing in the same direction as the,
camshaft position sensor installation direction when
camshaft is at the No. 1 compression TDC position.
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ENGINE H e a d
I n t a k e s i d eFront of
enaine
Exhaust side
Step 4
I
Painted marks
Step 5
Painted marks
Thermostat case assembly orwater pump
Water inlet pipe assembly
(3) bolts by the f o l l o w i n g
Step
Tighten to
78
(58
Remarks
In the in the
2 Loosen In order of that
3Tighten to
20 Nm (15
4Tighten of a turn.In the order-shown in-the
. illustration; Mark
of the cylinder head bolt
and cylinder head by
paint. ,
5
Tighten of a turn. shown in the
Check that the
painted
of
. lined
the
Caution
1.Always make a tightening If
than the head bolt will loosened.
2.If it is more than remove the head bolt repeat
the procedure 1. ,
the O-ring to the water inlet pipe,and coat the outer
inside diameter
the O-ring with water or coolant.
Caution
Do not let engine oil or other greases contact
O-ring.
TH E R M OSTAT CASE AS S E M B L Y
(1) Loosen the water inlet pipe bolt shown in
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ENGINE Timing Belt
,Set pin
I
Timing marksCylinder had
Itop surface
Crankshaft
sprocket
60 mm
60 mm
(2.36 in.)
(2.36 in.)
or more
or more in.) in.)
(3) Use a press or vise to gently compress the auto tensioner
push rod until pin hole A of the push rod and pin hole
of the tensioner cylinder are aligned.
C a u t i o n If the compression speed is too fast, the rod may
become damaged, so be sure to carry out this opera-
tion slowly.
(4) Once the holes are aligned, insert the set pin.
NOTE
When replacing the auto tensioner a new part, the
pin will be in the auto tensioner.
(5) Install the auto tensioner to the engine.
TIMING BELT INSTALLATION’
(1) Align the timing marks on the camshaft sprocket , crank-
shaft sprocket and oil pump
(2) After aligning the timing mark on the oil pump sprocket,
remove the cylinder block plug and insert a Phillips screw-
driver with a diameter of 8 mm in.), and check to
be sure that the screwdriver goes in 60 mm (2.36 in .)
or more. If the screwdriver will only go in 20
25 mm
in.) before striking the counterbalance shaft,
turn the sprocket once, realign the timing mark and check
that the screwdriver goes in 60 mm (2.36 in.) or mo re.
Do not take out the screwdriver until thet i m i n g b e l t i s
installed.
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ENGINE Timing Belt
CounterbalanceBelt tension side
Timingmarks
Belt tension side tension side
installation bolt
BELT REMOVAL
Caution
If timing belt is ‘to be use chalk to
it with an arrow on its flat side indicating the tu rning
direction (to the right).
INSTALLATION SERVICE POINTS
BELT INSTALLATION
Install’ timing belt “B” by the following procedure .
(1) Ensure that crankshaft sprocket “B” timing mark and the
counterbalance shaft sprocket timing mark are align ed.
(2) Fit timing belt “B” over crankshaft sprocket
and the
silent shaft sprocket. Ensure that there is no slac k in
the belt.
BELT TENSION ADJUSTMENT
Adjust the tension of timing belt by the following procedure.
(1) Temporarily fix the timing belt “B” tensioner s uch that
the center of the tensioner pulley is to the left and above
the center of the installation bolt, and temporarily attach
the tensioner pulley so that the flange the front
of the engine.
Holding the timing belt “B” tensioner your finger
in the direction arrow, place the
belt so that the tension side of the taut. Now tighten
the bolt to fix the tensioner.
Caution
When tightening the bolt, ‘the tensioner
pulley shaft does not rotate
“bolt.
it to rotate with the bolt can cause excessive
on the belt.
(3) Press the belt at the shown point by a finger ‘ to check
belt tension. If not, adjust.
__Standard value: 5-7 mm In.)

ENGINE OVERHAUL Timing’
COUNTERBALANCE SHAFT
INSTALLATION
BELT “B” INSTALLATION
(1) Align timing marks on the crankshaft sprocket
and
counterbalance shaft sprocket with the marks on the front
case respectively.
(2) Install the timing belt on the crankshaft sprocket
and counterbalance shaft sprocket. There should be no
slack on the tension side.
(3) Make sure that the relationship between, the te nsioner
pulley center and the bolt center is as shown in th e
illustration.
(4) Move the tensioner “B” in the direction of arrow while
lifting with a finger to give a sufficient tension to the tension
side of timing belt. In this condition, tighten bolt to secure
tensioner When the bolt is tightened, use care to
prevent shaft from turning together. If shaft is tu rned
together, belt will be
(5) Check to ensure that timing marks on sprockets and front
case are in alignment.
(6) Press with index finger the center of span on
side of timing belt “B”. The belt must deflect 5-7 mm
in.).
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