1991 MITSUBISHI MONTERO power steering

* Wrap shop towels around fuel return and high pressure hoses
to prevent fuel splashing on engine. Disconnect fuel return
hose and high pressure fuel hose to drain any residual fuel.
ENGINE
Removal (Montero & Pickup)
1) Remove hood. Drain cooling system, and remove radiator.
Remove skid plate and splash shields. Release fuel system pressure.
See FUEL PRESSURE RELEASE under REMOVAL & INSTALLATION. Disconnect
negative battery cable.
2) Remove air cleaner ducts. Remove accessory drive belts.
Remove and support A/C compressor and power steering pump. DO NOT
disconnect hoses from compressor or pump. Disconnect oil cooler hoses.
Cover fuel hose using shop towel, and disconnect high pressure fuel
hose and "O" ring. Remove fuel return hose.
3) Label and disconnect all vacuum hoses. Disconnect cooling
system hoses. Label and disconnect all electrical connections from
engine. Remove heat shield from motor mounts. Remove motor mount
bolts. Ensure all hoses and wires are disconnected and set aside.
4) Disconnect exhaust pipe from exhaust manifolds. Remove
starter. Attach engine hoist to engine. Support transmission.
Disconnect engine from transmission. See appropriate article in
CLUTCHES or TRANSMISSION SERVICING. Remove engine.
Installation (Montero & Pickup)
To install, reverse removal procedure. Install new "O" ring
on fuel line. Install new exhaust gaskets and nuts. See TORQUE
SPECIFICATIONS (MONTERO & PICKUP) table at end of article. Adjust
fluid levels.
Removal (3000GT)
1) Release fuel pressure. See FUEL PRESSURE RELEASE under
REMOVAL & INSTALLATION. Remove hood. Remove cruise control vacuum pump
and linkage. On turbo models, remove necessary turbo air intake hoses
and pipes. On all other models, remove air cleaner hoses.
2) On all models, drain cooling system. Drain engine oil and
transaxle oil. Remove heater hoses and radiator hoses. Remove
transaxle assembly. See appropriate article in CLUTCHES or
TRANSMISSION SERVICING.
3) Remove radiator. Label and disconnect all vacuum hoses.
Label and disconnect all electrical connections and harnesses from
engine. Remove accessory drive belts.
4) Remove and support A/C compressor and power steering pump.
DO NOT disconnect hoses from compressor or pump. Cover fuel hose using
shop towel, and disconnect high pressure fuel hose and "O" ring.
Remove fuel return hose.
5) On turbo models, disconnect oil cooler and vacuum hoses.
On all models, remove motor mount bolts and brackets. Ensure all hoses
and wires are disconnected and set aside. Attach engine hoist to
engine. Remove engine.
Installation
To install, reverse removal procedure. Install new "O" ring
on fuel line. Install new exhaust gaskets and nuts. See TORQUE
SPECIFICATIONS (3000GT) table at end of article. Adjust fluid levels.
UPPER INTAKE MANIFOLD
Removal (Montero & Pickup)
1) Remove air intake hose. See Fig. 1. Remove accelerator
cable adjusting bolts. On models equipped with automatic transmission,
remove throttle control cable. On all models, remove accelerator

TIMING BELT under REMOVAL & INSTALLATION. Remove intake camshaft
sprockets.
4) Remove coolant manifold and coolant inlet pipe. Using
Socket (MD998051), remove cylinder head bolts. Remove cylinder head
and camshaft assemblies. Note direction of washer installation on head
bolts.
Inspection (DOHC)
Check cylinder head height. Check warpage at gasket and
manifold surfaces. Resurface head if warpage exceeds specification.
See CYLINDER HEAD (DOHC) table under ENGINE SPECIFICATIONS at end of
article. After resurfacing, recheck cylinder head height. Replace
cylinder head if it is not within specification.
Installation (DOHC)
1) Ensure mating surfaces are clean and dry. Note
identification mark located on front of head gasket. Identification
marks are: "R" for SOHC, "2DN" for DOHC non-turbocharged and "2DT" for
DOHC turbocharged engine. Install head gasket with identification mark
toward timing belt side of engine and facing upward. Ensure all holes
are aligned.
NOTE: Install head gasket with identification mark toward timing
belt side of engine and facing upward. Ensure all holes
align. Install washers on head bolts with chamfered side
toward bolt head.
2) Install cylinder head and bolts. Ensure washers are
installed on head bolts with chamfered side toward bolt head. Using
proper sequence, tighten bolts to specification in 2-3 steps. See
Fig. 5 . See TORQUE SPECIFICATIONS (3000GT) table at end of article. On
turbocharger equipped engines, back off head bolts once, and repeat
tightening procedure.
3) To reinstall camshaft sprocket, hold hexagonal area of
camshaft using wrench while tightening sprocket bolt. Tighten rocker
cover bolts in a crisscross pattern. Start at 4 corners of rocker
cover and move toward center.
NOTE: Rocker cover bolts are color coded. Front cylinder bank
bolts are black; rear cylinder bank bolts are green.
4) To complete installation, reverse removal procedure.
Tighten bolts and nuts to specification. See TORQUE SPECIFICATIONS
(3000GT) table.
FRONT CRANKSHAFT OIL SEAL
Removal & Installation
Remove timing belt and crankshaft sprocket. See TIMING BELT
under REMOVAL & INSTALLATION. Pry oil seal from oil pump. To install,
coat seal lip with grease. Using Seal Installer (MD998717), install
seal in oil pump. Install remaining components. See appropriate TORQUE
SPECIFICATIONS table at end of article.
TIMING BELT
Removal (Montero & Pickup)
1) Drain cooling system. Disconnect upper radiator hose.
Remove upper radiator shroud. Remove cooling fan and fan clutch
assembly. Remove cooling fan pulley. Remove all drive belts. Remove
power steering pump with pressure and return hoses connected, and set
aside.
2) Remove power steering pump brackets. Remove A/C tensioner

Fig. 10: Engine Support Bracket Bolt Removal Sequence (3000GT)
Courtesy of Mitsubishi Motor Sales of America, Inc.
NOTE: Apply spray lubricant on reamer bolt during removal as bolt
is sometimes seized in engine support bracket.
Removal (3000GT)
1) Remove lower splash shields. Remove cruise control
actuator (if equipped). Remove all drive belts. Disconnect electrical
connector at power steering pump. Remove A/C tensioner pulley and
mounting bracket.
2) Remove power steering pump with hoses connected, and wire
aside. Support engine. Remove front engine mount through bolt and
front engine mount. Remove timing belt No. 1 upper outer cover and
gaskets. See Fig. 7.
3) Remove engine support bracket bolts in proper sequence.
See Fig. 10 . Remove engine support bracket. Remove cover cap and
timing belt No. 2 upper outer cover and gaskets. Using Holder
(MB990767) and Adapter Bolts (MD998719), remove crankshaft pulley.
4) Remove lower outer cover, gaskets and flange. See Fig. 7.
Rotate crankshaft and align all timing marks. See Fig. 8. Loosen belt
tensioner bolt, and rotate belt tensioner counterclockwise to release
belt tension.
5) If reusing timing belt, place arrow on belt to indicate
direction of belt rotation. Remove timing belt and belt tensioner.
6) If camshaft sprocket requires removal, install Holder
(MB990767) with Adapter Bolts (MD998719) on camshaft sprocket. Remov\
e
camshaft sprocket bolt and camshaft sprocket. Remove rear timing belt
cover (if required).
Inspection (3000GT)
Inspect timing belt for wear on edges of drive teeth. Inspect
belt for oil contamination. Replace belt if damaged or contaminated.

DRIV E B ELT R O UTIN G

1991 M it s u bis h i M onte ro
1991 ENGINE COOLING
Mitsubishi Drive Belt Routing
Mitsubishi; Eclipse, Galant, Mirage,
Montero, Pickup, Precis, 3000GT
BELT ADJUSTMENT SPECIFICATIONS
BELT ADJUSTMENT TABLE








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Deflection
Application ( 1) In. (mm)
Eclipse
1.8L .......................................... .32-.43 (8.1-10.9)\
2.0L .......................................... .35-.45 (8.9-11.4)\
Galant ( 2)
Alternator Belt ............................... .35-.45 (8.9-11.4)\
A/C Belt ............................................... .32 (8.1)\
Power Steering Belt ............................ .24-.35 (6.1-8.9)\
Montero ( 3) ...................................... .20-.24 (5.1-6.1)
Pickup
2.4L ........................................... .27-.39 (6.8-9.9)\
3.0L ( 3) ....................................... .32-.39 (8.1-9.9)
Precis
A/C Belt ...................................... .32-.40 (8.1-10.2)\
Alternator Belt ................................ .28-.32 (7.1-8.1)\
3000GT ( 4)
DOHC
Alternator Belt ............................... .16-.22 (4.1-5.6)\
Power Steering Belt .......................... .35-.43 (8.9-10.9)\
SOHC
Alternator & Power Steering Belt .............. .24-.35 (6.1-8.9)\
A/C Belt ...................................... .28-.37 (7.1-9.5)\
( 1) - With 22 lbs. (10 kg) pressure applied midway on belt run.
( 2) - For belt routing, see Fig. 1.
( 3) - For belt routing, see Fig. 2.
( 4) - For belt routing, see Figs. 3, 3 or 4.









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Inhibitor Switch (A/T) At base of shift lever.
Oil Pressure Switch On right side of engine, near
oil filter.
Power Steering Pressure Switch On power steering pump.









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MISCELLANEOUS








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Component Component Location








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A/C-Heater Blower Motor Resistor On blower motor housing.
Diagnostic/Test Connector:

FUEL TANKS
GAS CAPS
GASKETS
GROMMETS (VALVE COVER)
HARMONIC DAMPERS
HEATER CONTROL VALVES
HEATER CORES
HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS
HOSE CLAMPS
HOSE CONNECTORS
HOSE COUPLERS
HOSES AND TUBES (FUEL LINES, RADIATOR, VACUUM, BY PASS,
HEATER, RECOVERY TANK AND OIL COOLERS)
HOUSINGS
IDLE AIR CONTROLS
IDLE SPEED CONTROL ACTUATORS
IGNITION BOOTS
IGNITION COIL TOWERS
IGNITION COILS
IGNITION CONTROL MODULES (ICM)
IGNITION SWITCHES
IGNITION TERMINALS
IGNITION WIRES, BOOTS, COIL TOWERS AND TERMINALS (SECONDARY)
IN-TANK FUEL STRAINERS
INERTIA FUEL SHUT-OFF SWITCHES
INTAKE AIR TEMPERATURE SENSORS
INTAKE MANIFOLDS
INTERCOOLERS
KNOCK SENSORS
LIQUID VAPOR SEPARATORS
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSORS
MASS AIR FLOW (MAF) SENSORS
METAL AIR MANIFOLDS AND PIPES
METAL AIR PIPES
MIX CONTROL SOLENOIDS
MOTOR MOUNTS
O-RINGS, GASKETS, SEALS AND SPRING LOCKS
O2 SENSORS
OIL PRESSURE SENDING UNITS
OIL PUMP PICK-UP SCREENS
OIL PUMPS
PARK NEUTRAL POSITION SWITCHES
PCV BREATHER ELEMENTS
PCV ORIFICES
PCV VALVES
PICK-UP ASSEMBLIES (INCLUDES MAGNETIC, HALL EFFECT AND
OPTICAL)
POWER STEERING PRESSURE SENSORS
POWERTRAIN CONTROL MODULES (PCM) AND PROM
POWERTRAIN CONTROL PROM
PRESSURIZED EXPANSION TANK CAPS
RADIATOR CAPS AND PRESSURIZED EXPANSION TANK CAPS
RADIATOR FAN BLADES
RADIATOR FAN CLUTCHES
RADIATORS
ROLL OVER VALVES
SEALING COMPOUNDS
SEALS
SECONDARY AIR INJECTION SYSTEM MANAGEMENT DEVICES
SENSORS AND ACTUATORS
SHROUDS, BAFFLES AND DEFLECTORS
SPARK PLUGS
SPRING LOCKS

Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A ........... (1) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead corroded ...... A .. Require repair or replacement.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
( 1) - Determine cause and correct prior to repair or
replacement of part.
( 2) - Inoperative includes intermittent operation or out of
OEM specification. Refer to OEM recommended service'
procedures.









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POWER STEERING PRESSURE SENSORS
POWER STEERING PRESSURE SENSOR INSPECTION








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Condition Code Procedure
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of hardware.
Attaching hardware
threads stripped
(threads missing) ...... A ... Require repair or replacement
of hardware.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A ........... ( 1) Require repair or
replacement.
Connector missing ....... C ............ Require replacement.
Contaminated ............ A ........... ( 2) Require repair or
replacement.
Inoperative ............. B ........... ( 3) Require repair or
replacement. Further
inspection required.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Resistance out of
specification .......... B .. Require repair or replacement.
Restricted, affecting
performance ............ A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A ........... ( 1) Require repair or

Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
(1) - Determine cause and correct prior to repair or
replacement of part.
( 2) - Determine source of contamination, such as engine coolant,
fuel, metal particles, or water. Require repair or
replacement.
( 3) - Inoperative includes intermittent operation or out of
OEM specification. Some components may be serviceable;
check for accepted cleaning procedure.









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SENSORS AND ACTUATORS
NOTE: Conditions pertaining to the sensors and actuators listed
in this section may be found under the name of the sensor
or actuator.
SENSOR ABBREVIATION TABLE









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Sensor Abbreviation
Accelerator Pedal Position Sensor ......................... APP
Air Conditioning Cycling Switch ............................ AC
Air Conditioning Pressure Sensor ........................... ..
Air Fuel Ratio Sensor ...................................... ..
Barometric Pressure Sensor ............................... BARO
Camshaft Position Sensor .................................. CMP
Clutch Pedal Position Switch .............................. CPP
Cooling Fan Motor Sensors and Switches ..................... ..
Crankshaft Position Sensor ................................ CKP
Electronic Transmission Feedback Devices ................... ..
Engine Coolant Temperature Sensor ......................... ECT
Evaporative Emission feedback devices ...................... ..
Exhaust Gas Recirculation feedback devices ................. ..
Fan Control Sensor ......................................... FC
Intake Air Temperature Sensor ............................. IAT
Knock Sensor ............................................... KS
Manifold Absolute Pressure Sensor ......................... MAP
Mass Air Flow Sensor ...................................... MAF
O2 Sensor ................................................. O2S
Park Neutral Position Switch .............................. PNP
Power Steering Pressure Sensor ............................ PSP
Thermal Vacuum Valve ...................................... TVV
Throttle Position Sensor ............................ TP Sensor
Throttle Position Switch ................................... ..
Transmission Range Switch ........................... TR Switch
Vehicle Speed Sensor ...................................... VSS
Volume Air Flow Sensor .................................... VAF









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ACTUATOR ABBREVIATION TABLE








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Actuator Abbreviation
Air Injection Control Solenoid ............................. ..
Electronic Transmission control devices .................... ..
Evaporative Emission Canister ............................ EVAP
Purge Device ............................................... ..
Exhaust Gas Recirculation Device .......................... EGR
Fuel Injector .............................................. ..
Idle Air Control .......................................... IAC