1991 MITSUBISHI MONTERO spark plugs replace
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D - A D JU STM EN TS
1991 M it s u bis h i M onte ro
1991 ENGINE PERFORMANCE
On-Vehicle Adjustments
Chrysler Motors: Colt, Colt 200, Colt Vista,
Ram-50, Stealth, Summit
Mitsubishi: Eclipse, Galant, Mirage, Montero,
Pickup, 3000GT
ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or
ignition system, ensure engine mechanical condition is okay.
VALVE CLEARANCE
NOTE: All engines except 1.5L use hydraulic valve lifters. Valve
adjustment is only required on 1.5L engines. To check
hydraulic valve lifter operation, see CHECKING HYDRAULIC
VALVE LIFTERS.
MECHANICAL VALVE LIFTERS
CAUTION: DO NOT rotate crankshaft in opposite direction of normal
engine rotation.
1.5L
1) Ensure engine is at normal operating temperature. Remove
all spark plugs and valve cover. Rotate crankshaft to position
cylinder No. 1 on TDC of compression stroke. Adjust intake valves on
cylinders No. 1 and No. 2, and exhaust valves on cylinders No. 1 and
No. 3. See VALVE CLEARANCE ADJUSTMENT table for specification.
2) Rotate crankshaft 360 degrees to position cylinder No. 4
on TDC of compression stroke. Adjust intake valves on cylinders No. 3
and No. 4, and exhaust valves on cylinders No. 2 and No. 4.
VALVE CLEARANCE ADJUSTMENT TABLE
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Cold Hot
Application In. (mm) In. (mm)
Intake ............ .003 (.07) ......... .006 (.15)
Exhaust ........... .007 (.17) ......... .010 (.25)
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CHECKING HYDRAULIC VALVE LIFTERS
Except 1.5L
1) Remove valve cover. Push downward on end of rocker arm
above lash adjuster. If lash adjuster is normal, it will feel hard. If
lash adjuster moves downward easily when pushed, replace adjuster.
2) If lash adjuster feels soft or spongy, oil with air has
probably entered lash adjuster. If this occurs, check engine oil
level. If engine oil level is okay, check oil screen and oil screen
gasket for damage.
3) After repairing cause of air leak, warm engine to
operating temperature. Drive vehicle at low speed for approximately 5
minutes. Turn engine off for a few minutes.
4) Restart engine and drive at low speed for approximately 5
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than .010" (.25 mm) from tip. Chamfer sharp edge of reground valve
tip. Recheck valve stem installed height.
VALVE STEM OIL SEALS
Valve stem oil seals must be installed on valve stem. See
Fig. 2 . Seals are needed due to pressure differential at the ends of
valve guides. Atmospheric pressure above intake guide, combined with
manifold vacuum below guide, causes oil to be drawn into the cylinder.
Exhaust guides also have pressure differential created by
exhaust gas flowing past the guide, creating a low pressure area. This
low pressure area draws oil into the exhaust system.
Replacement (On Vehicle)
Mark rocker arm or overhead cam components for location.
Remove rocker arm components or overhead cam components. Components
must be installed in original location. Remove spark plugs. Valve stem
oil seals may be replaced by holding valves against seats using air
pressure.
Air pressure must be installed in cylinder using an adapter
for spark plug hole. An adapter can be constructed by welding air hose
connection to spark plug body with porcelain removed.
Install adapter in spark plug hole. Apply a minimum of 140
psi (9.8 kg/cm
) to adapter. Air pressure should hold valve closed. If
air pressure does not hold valve closed, check for damaged or bent
valve. Cylinder head must be removed for service.
Using valve spring compressor, compress valve springs. Remove
valve locks. Carefully release spring compressor. Remove retainer or
rotator and valve spring. Remove valve stem oil seal.
If oversized valves have been installed, oversized oil seals
must be used. Coat valve stem with engine oil. Install protective
sleeve over end of valve stem. Install new oil seal over valve stem
and seat on valve guide. Remove protective sleeve. Install spring
seat, valve spring and retainer or rotator. Compress spring and
install valve locks. Remove spring compressor. Ensure valve locks
are fully seated.
Install rocker arms or overhead cam components. Tighten all
bolts to specification. Adjust valves if required. Remove adapter.
Install spark plugs, valve cover and gasket.
VALVE SPRING INSTALLED HEIGHT
Valve spring installed height should be checked during
reassembly. Measure height from lower edge of valve spring to the
upper edge. DO NOT include valve spring seat or retainer. Distance
must be within specifications. If valves and/or seats have been
ground, a valve spring shim may be required to correct spring height.
See Fig. 12 .
Fig. 12: Measuring Valve Spring Installed Height - Typical
This Graphic For General Information Only
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Idle Speed Control Actuator ............................... ISC
Mix Control Solenoid .............................. MC Solenoid
Secondary Air Injection System Management Device .... AIR, PAIR
Vacuum Regulator Solenoid .................................. ..
Waste Gate Control Solenoid ................................ ..
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SHROUDS, BAFFLES AND DEFLECTORS
SHROUD, BAFFLE AND DEFLECTOR INSPECTION \
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Condition Code Procedure
Application incorrect,
affecting cooling system
performance ............ A . Require repair or replacement.
Attaching hardware
broken ................. A .. Require repair or replacement
of hardware.
Attaching hardware
missing ................ C ......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A .. Require repair or replacement
of hardware.
Bent, affecting cooling
system performance ..... A . Require repair or replacement.
Blocked, affecting cooling
system performance ..... A . Require repair or replacement.
Broken, affecting cooling
system performance ..... A . Require repair or replacement.
Cracked, affecting cooling
system performance ..... A . Require repair or replacement.
Loose, affecting cooling
system performance ..... A ................ Require repair.
Loose, not affecting
cooling system
performance ............ 2 ................ Suggest repair.
Missing, affecting cooling
system performance ..... C ........... Require replacement.
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SPARK PLUGS
NOTE: You are not required to replace spark plugs in sets.
However, you may suggest replacement of the other plugs
for preventive maintenance.
SPARK PLUG INSPECTION
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Condition Code Procedure
Application incorrect ... B ............ Require replacement.
Electrode eroded ........ 1 ............ Suggest replacement.
Fouled .................. A ........... ( 1) Require repair or
replacement.
Gap incorrect ........... B .. Require repair or replacement.
Insulation broken ....... A ............. Require replacement
Insulator cracked ....... A ............ Require replacement.
Leaking compression ..... A .. Require repair or replacement.
Maintenance interval .... 3 ............ Suggest replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
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Service Or Inspect
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Verify Last Major Service Was Performed
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Valve Clearance (Jet Valve Only)
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Manual Transmission Oil & Transfer Case
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Carburetor Choke Mechanism & Linkage (If Equipped)
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Disc Brake Pads
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Drum Brake Linings & Rear Wheel Cylinders
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Brake Hoses
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Fuel & Vapor Hoses
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Steering Linkage Seals & Drive Shaft Boots
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Lubricate Ball Joint
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Power Steering Fluid (If Equipped)
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Power Steering Hoses (If Equipped)
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Lubricate Front Wheel Bearing
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Drive Axle Fluid (Without Limited-Slip Differential)
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Exhaust System
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Lubricate Upper Control Arm Bushings
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Drive Belt (Water Pump & Alternator)
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Replace
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Air Filter
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Spark Plugs
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Drive Axle Fluid (With Limited-Slip Differential)
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Automatic Transmission & Transfer Case Fluids
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Engine Oil & Filter
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Engine Coolant
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Lubrication Specifications
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Application Specification
Brake & Clutch Fluid ............................ DOT 3 Or DOT 4
Engine Coolant .............. Ethylene-Glycol Antifreeze Coolant
Engine Oil (
1)
Minimum Temperature
Greater Than 32
F (0
C) ...... SAE 20W-40 Or 20W-50 API SG/CD
Greater Than -10
F (-23
C) ..... SAE 10W-30, 10W-40 API SG/CD
Maximum Temperature
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Replace
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Air Filter
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Spark Plugs
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Drive Axle Fluid (With Limited-Slip Differential)
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Automatic Transmission & Transfer Case Fluids
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Engine Oil & Filter
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Engine Coolant
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Lubrication Specifications
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Application Specification
Brake & Clutch Fluid ............................ DOT 3 Or DOT 4
Engine Coolant .............. Ethylene-Glycol Antifreeze Coolant
Engine Oil (
1)
Minimum Temperature
Greater Than 32
F (0
C) ...... SAE 20W-40 Or 20W-50 API SG/CD
Greater Than -10
F (-23
C) ..... SAE 10W-30, 10W-40 API SG/CD
Maximum Temperature
Less Than 60
F (16
C) .......... SAE 5W-30 Or 5W-40 API SG/CD
Front Axle & Conventional Rear Axle
Minimum Temperature
Greater Than -10
F (-23
C) ........... SAE 90, 85W-90, 80W-90
API GL-5
Maximum Temperature
Less Than -30
F (-34
C) .................... SAE 75W API GL-5
Power Steering Fluid ............................. Dexron-II ATF
Rear Axle (With Limited
Slip Differential) ............ Hypoid Gear Oil (8149630EX) Or
Equivalent
Transmission
Automatic ...................................... Dexron-II ATF
Manual Transaxle &
Transfer Case (4WD) ................. SAE 75W-85W, 75W-90 API
GL-4 Or GL-5
(
1) - Since temperature ranges for different oil grades overlap,
brief fluctuations in outside temperatures are no cause for
concern.
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Fluid Capacities
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Application Quantity
Automatic Transmission
1987-93 ...................................... 7.6 Qts. (7.2L)
1994 (3.0L SOHC) ............................. 7.6 Qts. (7.2L) \
1994 (3.0L DOHC & 3.5L) ...................... 9.0 Qts. (8.5L) \
1995 ......................................... 7.9 Qts. (7.5L)
Cooling System
1987-88 ...................................... 8.5 Qts. (8.0L)
1989-95
2.6L ........................................ 9.7 Qts. (9.2L)
3.0L ....................................... 10.0 Qts. (9.5L)
1994-95
3.5L ....................................... 10.0 Qts. (9.5L)
Differential
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Manual Transmission Oil & Transfer Case
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Carburetor Choke Mechanism & Linkage (2.6L Engine)
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Crankcase Emission Control System (PCV Valve)
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Evaporative Emission Control System
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Distributor Cap, Rotor & Spark Advanced System
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Intake Temperature Control System
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Secondary Air System
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Front Disc Pads
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Rear Drum Brake Linings & Wheel & Cylinders
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Brake Hoses
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Steering Linkage Seals & Drive Shaft Boots
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Lubricate Ball Joints
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Drive Axle Fluid (Without Limited-Slip Differential)
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Exhaust System
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Vacuum, Water, Crankcase Ventilation & Secondary Air Hoses
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Replace
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Air Filter
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Fuel Filter
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Spark Plugs
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Ignition Cables
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Camshaft Timing Belt
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Lubrication Specifications
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Application Specification
Brake & Clutch Fluid ............................ DOT 3 Or DOT 4
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![MITSUBISHI MONTERO 1991 Service Manual Power Steering (Dexron-II)
Colt, Colt Vista, Colt 200, Mirage & Summit ...... 1.9 Qts. (.9L)\
Eclipse & Galant .................................. 1.9 Qts. (.9L)\
Montero ................](/manual-img/19/57332/w960_57332-735.png "MITSUBISHI MONTERO 1991 Service Manual Power Steering (Dexron-II)
Colt, Colt Vista, Colt 200, Mirage & Summit ...... 1.9 Qts. (.9L)\
Eclipse & Galant .................................. 1.9 Qts. (.9L)\
Montero ................")
Power Steering (Dexron-II)
Colt, Colt Vista, Colt 200, Mirage & Summit ...... 1.9 Qts. (.9L)\
Eclipse & Galant .................................. 1.9 Qts. (.9L)\
Montero .......................................... 2.2 Pts. (1.0L)\
Pickup & Ram-50 ................................... 1.9 Qts. (.9L)\
Stealth & 3000GT
2-Wheel Steering ................................ 1.9 Pts. (.9L)\
4-Wheel Steering ............................... 2.5 Pts. (1.2L)\
Transfer Case (SAE 75W-85/API GL-4)
Colt Vista ........................................ 1.5 Pts. (.7L)\
Eclipse & Galant .................................. 1.3 Pts. (.6L)\
Montero, Pickup & Ram-50 ......................... 4.7 Pts. (2.2L)\
Stealth ............................................. .3 Pt. (.2L)\
3000GT .............................................. .6 Pt. (.3L)\
(1) - Add 1.0 Pt. (.5L) with oil cooler.
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QUICK-SERVICE
SERVICE INTERVALS & SPECIFICATIONS
REPLACEMENT INTERVALS \
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Component Miles
Colt, Colt 200, Mirage & Summit
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
Spark Plugs ...................... 30,000
Timing Belt ...................... 60,000
Colt Vista
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
EGR Valve ( 1) .................... 50,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
O2 Sensor ( 1) .................... 80,000
Rear Axle Fluid .................. 30,000
Spark Plugs ...................... 30,000
Spark Plug Wires ( 1) ............. 60,000
Timing Belt ...................... 60,000
Vapor Canister ( 1) .............. 100,000
Mirage
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Filter ........................... 15,000
Spark Plugs ...................... 30,000
Timing Belt ...................... 60,000
Eclipse
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Incorrect ignition timing Reset ignition timing,
See TUNE-UP
Leaking valves Replace valves, See
ENGINES
Worn fuel pump diaphragm Replace diaphragm or
or piston piston
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Intake Backfire Improper ignition timing Reset ignition timing,
See TUNE-UP
Faulty accelerator pump Replace accelerator
discharge pump
Improper choke operation Check choke and adjust
as required
Defective EGR valve Replace EGR valve
Fuel mixture too lean Reset air/fuel mixture,
See TUNE-UP
Choke valve initial Reset choke valve
clearance too large initial clearance
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Exhaust Backfire Vacuum leak Inspect and repair
vacuum system
Faulty vacuum diverter Replace vacuum diverter
valve valve
Faulty choke operation Check choke and adjust
as required
Exhaust system leak repair exhaust system
leak
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Engine Ignition timing too far Reset ignition timing,
Detonation advanced See TUNE-UP
Faulty ignition system Check ignition timing,
See TUNE-UP
Spark plugs loose or Retighten or replace
faulty plugs
Fuel delivery system Inspect lines, pump and
clogged filter for clog
EGR valve inoperative Replace EGR valve
PCV system inoperative Inspect and/or replace
hoses or valve
Vacuum leaks Check vacuum system and
repair leaks
Excessive combustion
chamber deposits Remove built-up
deposits
Leaking, sticking or Inspect and/or replace
broken valves valves
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External Oil Fuel pump improperly seated Remove pump, replace
Leakage or worn gasket gasket and seat
properly
Oil pan gasket broken or Straighten pan and
pan bent replace gasket
Timing chain cover gasket Replace timing chain
broken cover gasket
Rear main oil seal worn Replace rear main oil
seal
Oil pan drain plug not Remove and reinstall
seated properly drain plug
Camshaft bearing drain Remove restriction
hole blocked
Oil pressure sending Remove and reinstall
switch leaking sending switch
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