MITSUBISHI TRITON 1997 Service Manual

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±

S
EA LA NT 111 00050218
I te m S
pecif ie d s e ala nt R
em ark O
il p an M
IT S U BIS H I G EN UIN E P A R T
M D970389 o r e quiv a le nt S
em i- d ry in g s e ala nt N
um ber N
am e U
se M
B991502 M
UT-II s u b a s-
s e m bly M
D998738 A
dju stin g s cre w M
B990767 E
nd y o ke h old er H
old in g th e c a m sh aft s p ro cke t M
D998719 o r
M D998754 C
ra nksh aft p ulle y
h old er p in M
D998713 C
am sh aft o il s e al
i n sta lle r P
re ss-in o f th e c a m sh aft o il s e al M
D998727 O
il p an r e m ove r R
em ova l o f th e o il p an M
D998781 F
ly w heel s to pper S
ecu rin g th e fly w heel < M /T > o r d riv e p la te
< A /T >

M
D998776 C
ra nksh aft r e ar o il
s e al in sta lle r P
re ss-fit tin g th e c ra nksh aft r e ar o il s e al M
B990938 H
andle P
re ss-fit tin g th e c ra nksh aft r e ar o il s e al M
D998747 C
ra nksh aft p ulle y
h old er S
upportin g o f c ra nksh aft s p ro cke t M
D998375 C
ra nksh aft fr o nt o il
s e al in sta lle r P
re ss-fit tin g th e c ra nksh aft fr o nt o il s e al M
D998767 T
e nsio n p ulle y
s o cke t w re nch T
im in g b elt te nsio n a dju stm ent

O
N-V EH IC LE S ER VIC E 111 00090326
D RIV E B ELT T E N SIO N C HEC K A ND
A DJU STM EN T
A LT E R NATO R D RIV E B ELT T E N SIO N C HEC K
U se a b elt te nsio n g auge to c h eck th at th e b elt te nsio n is
a t th e s ta ndard v a lu e a t a p oin t h alf - w ay b etw een th e tw o
p ulle ys a s s h ow n in th e illu str a tio n. In a ddit io n, p re ss th is
s e ctio n w it h a fo rc e o f 9 8 N a nd c h eck th at th e a m ount o f
b elt d efle ctio n is a t th e s ta ndard v a lu e.
S ta n dard v alu e:
T e nsio n N 2
94 ± 490 D
efle ctio n ( R efe re nce v a lu e) m m 7
.0 ± 9 .0 W
hen a u se d
b elt is in sta lle d W
hen a n ew
b elt is in sta lle d T
e nsio n N 3
43 ± 441 4
90 ± 686 D
efle ctio n ( R efe re nce
v a lu e) m m 7
.5 ± 8 .5 5
.5 ± 7 .5 W
ate r
p um p
p ulle y A
lt e rn ato r
p ulle y C
ra nksh aft p ulle y L
ock b olt

W
hen
c h ecke d W
hen a
u se d b elt is
i n ta lle d W
hen a n ew
b elt is
i n sta lle d T
e nsio n N 2
94 ± 4 90 3
43 ± 4 41 4
90 ± 6 86 D
efle ctio n
( R efe re nce
v a lu e) m m 5
.5 ± 7 .5 6
.0 ± 7 .0 4
.0 ± 6 .0 D
efle ctio n W
ate r p um p
p ulle y C
ra nksh aft
p ulle y A

W
hen
c h ecke d W
hen a
u se d b elt is
i n ta lle d W
hen a n ew
b elt is
i n sta lle d T
e nsio n N 3
55 ± 4 45 3
55 ± 4 45 5
30 ± 6 20 D
efle ctio n
( R efe re nce
v a lu e) m m 6
.0 ± 7 .0 6
.0 ± 7 .0 4
.5 ± 5 .5 C
ra nksh aft
p ulle y A
/C c o m pre sso r p ulle y C
ra nksh aft
p ulle y T
e nsio n p ulle y A
dju stin g b olt F
ix in g n ut A
/C c o m -
p re sso r
p ulle y

I
g nit io n tim in g a dju stm ent
c o nnecto r ( b ro w n) J
u m per w ir e T
o r e ta rd T
o a dva nce

ENGINE <4G6> ± On-vehicle Service11A-11
16. Attach a sealing tape to the fixing bolt and nut only for
vehicles for Switzerland.
NOTE
Sealing tape is attached to all new vehicles.
IDLE SPEED CHECK11100190330
1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Check the basic ignition timing. Adjust if necessary.
Standard value: 5 BTDC+2
3. After turning the ignition switch to OFF, connect the MUT-II
to the diagnosis connector.
4. Start the engine and run it at idle.
5. Run the engine at idle for 2 minutes.
6. Check the idle speed.
Curb idle speed: 750+100 r/min
NOTE
The idle speed is controlled automatically by the idle speed
control (ISC) system.
7. If the idle speed is outside the standard value, inspect
the MPI components by referring to GROUP 13A ±
Troubleshooting.
IDLE MIXTURE CHECK11100210265
1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Check that the basic ignition timing is within the standard
value.
Standard value: 5 BTDC+2
3. Turn the ignition switch to OFF and connect the MUT-II
to the diagnosis connector.
4. Start the engine and run it at 2,500 r/min for 2 minutes.
5. Set the CO, HC tester.
6. Check the CO contents and the HC contents at idle.
Standard value:
CO contents: 0.5% or less
HC contents: 100 ppm or less
7. If there is a deviation from the standard value, check
the following items:

Diagnosis output

Closed-loop control (When the closed-loop control
is normal, the output signal of the oxygen sensor
changes between 0 ± 400 mV and 600 ± 1,000 mV
at idle.)