1997 MITSUBISHI TRITON belt

11A-2
ENGINE <4G6>
CONTENTS11109000399
GENERAL INFORMATION 3. . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 3. . . . . . . . . . . . . . . . .
SEALANT 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 7. . . . . . . . . . . . . . . . . . . . .
Drive Belt Tension Check and Adjustment 7. . . . .
Ignition Timing Check and Adjustment 10. . . . . . .
Idle Speed Check 11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Mixture Check 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Compression Pressure Check 12. . . . . . . . . . . . . . . .
Manifold Vacuum Check 13. . . . . . . . . . . . . . . . . . . . . Lash Adjuster Check 14. . . . . . . . . . . . . . . . . . . . . . . .
CAMSHAFT OIL SEAL 16. . . . . . . . . . . . . . . . . . . .
OIL PAN, OIL SCREEN 19. . . . . . . . . . . . . . . . . . . .
CYLINDER HEAD GASKET 21. . . . . . . . . . . . . . . .
TIMING BELT, TIMING BELT B 26. . . . . . . . . . . .
CRANKSHAFT FRONT OIL SEAL 32. . . . . . . . . .
CRANKSHAFT REAR OIL SEAL 35. . . . . . . . . . .
ENGINE ASSEMBLY 37. . . . . . . . . . . . . . . . . . . . . .

ENGINE <4G6> ± General Information/Service Specifications11A-3
GENERAL INFORMATION11100010322
Items4G634G64
Total displacement m
1,9972,351
Bore y Stroke mm85.0 x 88.086.5 x 100.0
Compression ratio9.59.5
Combustion chamberPentroof typePentroof type
Camshaft arrangementSOHCSOHC
Number of valve
Intake88
Number of valve
Exhaust88
Intake
OpeningBTDC 11
BTDC 18

Valve timing
Intake
ClosingABDC 53
ABDC 58

Valve timing
Exhaust
OpeningBBDC 63
BBDC 58

Exhaust
ClosingATDC 21
ATDC 18

Fuel system
Electronic control
multipoint fuel
injectionElectronic control
multipoint fuel
injection
Rocker armRoller typeRoller type
Auto-lash adjusterEquippedEquipped
SERVICE SPECIFICATIONS11100030342
ItemsStandard valueLimit
Alternator drive
belt
Tension NWhen checked294 ± 490±
belt
tension
When a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked7.0 ± 9.0±
(Reference
value) mmWhen a used belt is installed7.5 ± 8.5±
When a new belt is installed5.5 ± 7.5±
Power steering
oilpumpdrive
Tension NWhen checked294 ± 490±
oil um drive
belt tensionWhen a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked5.5 ± 7.5±
(Reference
value) mmWhen a used belt is installed6.0 ± 7.0±
When a new belt is installed4.0 ± 6.0±

ENGINE <4G6> ± Service Specifications11A-4
ItemsLimit Standard value
A/C compres-
sor drive belt
Tension NWhen checked355 ± 445±
sor drive belt
tensionWhen a used belt is installed355 ± 445±
When a new belt is installed530 ± 620±
Deflection
(Reference
When checked6.0 ± 7.0±
(Reference
value) mmWhen a used belt is installed6.0 ± 7.0±
When a new belt is installed4.5 ± 5.5±
Basic ignition timing5
BTDC+2
±
Idle speed r/min750+100±
CO contents %0.5 or less±
HC contents ppm100 or less±
Compression pressure
(250±400 r/min) kPa
4G631,270min. 960
(250±400 r/min) kPa
4G641,320min. 1,000
Compression pressure difference of all cylinder kPa±max. 100
Intake manifold vacuum kPamin. 60±
Cylinder head bolt shank length mm±99.4
Auto-tensioner push rod movement mmWithin 1.0±
Timing belt tension torque Nm (Reference value)3.5±
Auto tensioner rod protrusion mm2.5 ± 3.0±

ENGINE <4D5> ± Service Specifications/Sealants11B-3
SERVICE SPECIFICATIONS11100030359
ItemsStandard valueLimit
Alternator drive belt
tension (for each
Tension NWhen checked245 ± 441±
tension (for each
belt)When a used belt is installed294 ± 392±)
When a new belt is installed392 ± 588±
Deflection
(Reference
When checked12.0 ± 17.0±
(Reference
value) mmWhen a used belt is installed13.0 ± 16.0±)
When a new belt is installed10.0 ± 13.0±
Power steering oil
pump drive belt ten
Tension NWhen checked294 ± 490±
pump drive belt ten-
sionWhen a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked8.0 ± 12.0±
(Reference
value) mmWhen a used belt is installed9.0 ± 11.5±)
When a new belt is installed6.0 ± 8.0±
A/C compressor
drive
Tension NWhen checked320 ± 400±
drive
belt tensionWhen a used belt is installed320 ± 400±
When a new belt is installed480 ± 560±
Deflection
(Reference
When checked6.0 ± 7.0±
(Reference
value) mmWhen a used belt is installed6.0 ± 7.0±)
When a new belt is installed4.5 ± 5.5±
Valve clearance (at hot) mm0.25±
Injection timing (Value indicated on dial gauge mm)9
ATDC (1 + 0.03)±
Idle speed r/min750 + 100±
Idle up engine speed for ABS r/min1,900 + 100±
Compression pressure kPa3,040Min. 2,200
Compression pressure difference of all cylinder (at engine speed of 280
r/min) kPa±Max. 300
Timing belt tension mm4 ± 5±
Timing belt B tension mm4 ± 5±
SEALANTS11100050270
ItemsSpecified sealantRemarks
Oil panMITSUBISHI GENUINE PART
MD970389 or equivalentSemi-drying sealant
Semi-circular packing and rocker
cover seal, and cylinder head seal3M ATD Part No. 8660 or equivalent

ENGINE LUBRICATION ± General Information12-2
GENERAL INFORMATION12100010053
The lubrication method is a fully force-fed, full-flow
filtration type.The corrugate fin type of engine oil cooler have
been adopted, and installed forward of the radiator.
<4D56>
Items4G634G644D56
Oil pump typeInvolute gear typeInvolute gear typeTrochoid type
Drive methodTiming beltTiming beltCrankshaft
ENGINE OILS
Health Warning
Prolonged and repeated contact with mineral oil
will result in the removal of natural fats from the
skin, leading to dryness, irritation and dermatitis.
In addition, used engine oil contains potentiallyharmful contaminants which may cause skin cancer.
Adequate means of skin protection and washing
facilities must be provided.
Recommended Precautions
The most effective precaution is to adapt working
practices which prevent, as far as practicable, the
risk of skin contact with mineral oils, for example
by using enclosed systems for handling used engine
oil and by degreasing components, where
practicable, before handling them.
Other precautions:

Avoid prolonged and repeated contact with oils,
particularly used engine oils.

Wear protective clothing, including impervious
gloves where practicable.

Avoid contaminating clothes, particularly
underpants, with oil.

Do not put oily rags in pockets, the use of
overalls without pockets will avoid this.

Do not wear heavily soiled clothing and
oil-impregnated foot-wear. Overalls must be
cleaned regularly and kept separate from
personal clothing.
Where there is a risk of eye contact, eye
protection should be worn, for example,
chemical goggles or face shields; in addition
an eye wash facility should be provided.

Obtain First Aid treatment immediately for open
cuts and wounds.

Wash regularly with soap and water to ensure
all oil is removed, especially before meals (skin
cleansers and nail brushes will help). After
cleaning, the application of preparations
containing lanolin to replace the natural skin
oils is advised.

Do not use petrol, kerosine, diesel fuel, gas
oil, thinners or solvents for cleaning skin.

Use barrier creams, applying them before each
work period, to help the removal of oil from
the skin after work.

If skin disorders develop, obtain medical advice
without delay.

MPI ± Troubleshooting13A-47
INSPECTION PROCEDURE 34
MUT-II: Inspection of no initial combustion
MUT-II Data list
16 Voltage of engine-ECU power source (Refer to P.13A-57.)NGCheck the power supply and ignition switch-IG system.
(Refer to P.13A-39, INSPECTION PROCEDURE 23.)
OK
Does the camshaft rotate at the engine cranking?
(When oil filler cap is removed.)NoCheck timing belt for breakage.
Ye s
MUT-II Self-Diag code
Are diagnosis codes displayed?Ye sRefer to P.13A-10, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-II Data list
22 Crank angle sensor
OK:Cranking speed is displayed.NoCheck the crank angle sensor system.
(Refer to P.13A-15, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 22.)
OK
MUT-II Actuator test
07 Fuel pump (Refer to P.13A-62.)NGCheck the fuel pump system.
(Refer to P.13A-40, INSPECTION PROCEDURE 24.)
OK
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13A-57.)NGCheck the engine coolant temperature sensor system.
(Refer to P.13A-14, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 21.)
INSPECTION PROCEDURE 35
Ignition system: Inspection of no initial combustion.
Does the engine tachometer display the cranking speed?

Set the tachometer of primary voltage detection type.NGCheck ignition circuit system.
(Refer to P.13A-44, INSPECTION PROCEDURE 30.)
OK
Check the ignition timing when cranking.
OK:Approx. 5BTDCNGCheck that the crank angle sensor is installed properly.

ENGINE COOLING ±
General Information/
Service Specifications/Lubricant/Sealants14-2
GENERAL INFORMATION14100010125
The cooling system is designed to keep every part
of the engine at appropriate temperature in
whatever condition the engine may be operated.
The cooling method is of the water-cooled, pressure
forced circulation type in which the water pump
pressurizes coolant and circulates it throughout the
engine. If the coolant temperature exceeds the
prescribed temperature, the thermostat opens to
circulate the coolant through the radiator as well
so that the heat absorbed by the coolant may be
radiated into the air.The water pump is of the centrifugal type and is
driven by the drive belt from the crankshaft.
The radiator is the corrugated fin, down flow type.
ItemsSpecifications
RadiatorPerformance kJ/h4G63 114,700
4G63 126,800
4G64, 4D56 <2WD>170,000
4D56 <4WD>227,300
Automatic transmission oil coolerPerformance kJ/h4G63 6,400
4D56 6,300
SERVICE SPECIFICATIONS14100030121
ItemsStandard valueLimit
High pressure valve opening pressure of radiator cap kPa75 ± 10565
Range of coolant antifreeze concentration of radiator %30 ± 60±
ThermostatValve opening temperature of thermostat
C82 + 1.5±
Full-opening temperature of thermostat
C95±
Valve lift (at 95
C) mm4G6, 4D56 <4WD>8.5 or more±
4D56 <2WD>8 or more±
LUBRICANT14100040100
ItemsQuantity

HIGH QUALITY ETHYLENE GLYCOL ANTIFREEZE COOLANT4G637.4
4G64, 4D56 <2WD>7.7
4D56 <4WD>7.8
SEALANTS14100050110
ItemsSpecified sealantRemarks
Cylinder block drain plug3M Nut Locking Part No. 4171 or equivalentDrying sealant
Water by-pass fitting <4G6>Mitsubishi Genuine Parts No. MD970389 or
equivalentSemi-drying sealant

ENGINE ELECTRICAL ± Charging System16-6
This test determines whether the alternator output
current is normal.
(1) Before the test, always be sure to check the
following.

Alternator installation

Battery (Refer to GROUP 54 ± Battery.)
NOTE
The battery should be slightly discharged.
The load needed by a fully-charged battery
is insufficient for an accurate test.

Alternator drive belt tension (Refer to
GROUP 11 ± On-vehicle Service.)

Fusible link

Abnormal noise from the alternator while
the engine is running.
(2) Turn the ignition switch off.
(3) Disconnect the negative battery cable.
(4) Disconnect the alternator output wire from the
alternator ªBº terminal. Connect a DC test
ammeter with a range of 0 ± 100 A in series
between the ªBº terminal and the disconnected
output wire. (Connect the (+) lead of the
ammeter to the ªBº terminal. Connect the (±)
lead of the ammeter to the disconnected output
wire.)
Caution
Never use clips but tighten bolts and nuts
to connect the line. Otherwise loose
connections (e.g. using clips) will lead to
a serious accident because of high current.
NOTE
An inductive-type ammeter which enables
measurements to be taken without
disconnecting the alternator output wire should
be recommended.
(5) Connect a voltmeter with a range of 0 ± 20 V
between the alternator ªBº terminal and the
earth. (Connect the (+) lead of the voltmeter
to the ªBº terminal, and then connect the (±)
lead of the voltmeter to the earth.)
(6) Connect the negative battery cable.
(7) Connect a tachometer. (Refer to GROUP 11
± On-vehicle Service.)
(8) Leave the hood open.
(9) Check that the reading on the voltmeter is equal
to the battery voltage.
NOTE
If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the alternator ªBº terminal and the battery (+)
terminal.(10)Turn the light switch on to turn on headlamps
and then start the engine.
(11) Immediately after setting the headlamps to high
beam and turning the heater blower switch to
the high revolution position, increase the engine
speed to 2,500 r/min and read the maximum
current output value displayed on the ammeter.
Limit: 70% of normal current output
NOTE

For the nominal current output, refer to the
Alternator Specifications.

Because the current from the battery will
soon drop after the engine is started, the
above step should be carried out as quickly
as possible in order to obtain the maximum
current output value.

The current output value will depend on
the electrical load and the temperature of
the alternator body.

If the electrical load is small while testing,
the specified level of current may not be
output even though the alternator is normal.
In such cases, increase the electrical load
by leaving the headlamps turned on for
some time to discharge the battery or by
using the lighting system in another vehicle,
and then test again.

The specified level of current also may not
be output if the temperature of the alternator
body or the ambient temperature is too
high. In such cases, cool the alternator and
then test again.
(12)The reading on the ammeter should be above
the limit value. If the reading is below the limit
value and the alternator output wire is normal,
remove the alternator from the engine and
check the alternator.
(13)Run the engine at idle after the test.
(14)Turn the ignition switch off.
(15)Remove the tachometer.
(16)Disconnect the negative battery cable.
(17)Disconnect the ammeter and voltmeter.
(18)Connect the alternator output wire to the
alternator ªBº terminal.
(19)Connect the negative battery cable.