1990 MITSUBISHI SPYDER Service Repair Manual

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Page 177 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE Troubleshooting,
TROUBLESHOOTING
Symptom Probable causeRemedy
Compression too low Cylinder head gasket blown Replace gasket
Piston ring worn or damaged Replace rings
Piston or cy

Page 178 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Crankshaft
B E L T
ADJUSTMENT
Check the belt tension with the tension gauge, or check the
belt deflection by pressing the middle point of the belt by
a force of 98
(22 ibs.).
Sta

Page 179 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE On-vehicle
Power
Powersteering oilpump pulleyTension
pulley
POWER STEERING OIL PUMP DRIVE BELT
CHECK <Vehicle
Use the belt tension gauge to check belt tension at the sho

Page 180 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE On-vehicle Service
POWER STEERING OIL PUMP AND A/C
DRIVE BELT TENSION ADJUSTMENTTensionpulley nut1. Loosen the tension pulley nut.
Tension pulley2.. Adjust the belt deflec

Page 181 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE On-vehicle Service
IDLE MIXTURE CHECK
11100210081
1.Before inspection, set vehicles in the following co ndition:
lEngine coolant temperature:
l Lights, electric cooling fan and

Page 182 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual E N G I N E On-vehicle Service’
5. Cover the spark plug hole with a shop towel etc. , and
after the engine has been cranked, check that no foreign
material is adhering to t

E N G I N E On-vehicle Service’
5. Cover the spark plug hole with a shop towel etc. , and
after the engine has been cranked, check that no foreign
material is adhering to the shop towel.
. 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
p s i )
Limit (at engine speed of
min. 689 (100 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:
NOTE
The limit value can be derived by calculating the d ifference
between the maximum and minimum values for the
compression pressure and dividing this value by the
maximum value.
9.If there is a cylinder with compression or a compre ssion
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repeat
the operations in steps 7 and 8. (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 surface.
(2) If the compression does not rise after oil is a dded,
the cause is a burnt or defective valve seat, or pr essure
is leaking from the gasket.
10. Connect the
relay (ASD relay) connector.
11. Install the spark plug and spark plug cable.
12. Use the scan tool to erase the diagnostic troub le codes.
NOTE
This will erase the diagnostic trouble code resulti ng
the relay (ASD relay) being disconnected.
TSB Revision

Page 183 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE On-vehicle.’
M A N I F O L D V A C U U M
1.Before inspection, set vehicles. in the condition:
Engine coolant
lLights, electric cooling and
lTransaxle: Neutral (P
2. Con

Page 184 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE Engine
ENGINE ASSEMBLY
REMOVAL AND INSTALLATION
Pm-removal Operationl Fuel Line Pressure Releasing(Refer to GROUP On-vehicle Service.)l Hood Removall Engine Coolant Draining
(

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