1997 MITSUBISHI TRITON oil pressure

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

AUTOMATIC TRANSMISSION ±
General Information/
Service Specifications23-2
GENERAL INFORMATION23100010141
ItemsVehicles with 4G63 engineVehicles with 4D56 engine
Transmission modelR4AW2-6V4AW2-6
Type4-speed full automatic4-speed full automatic
Gear ratio1st2.8262.826
2nd1.4931.493
3rd1.0001.000
4th0.7300.688
Reverse2.7032.703
Transfer type±2-speed
Gear ratioHigh±1.000
Low±1.925
Speedometer gear ratio (driven/drive)22/625/8
SERVICE SPECIFICATIONS23100030130
ItemsStandard value
Distance between inner cable stopper and end of outer cable <4G63> mm0 ± 1
Distance between inner cable stopper and end of outer cable <4D56> mm34 ± 35
Lock-up solenoid valve coil resistance (at 20
C) WApprox. 13
Stall speed r/min4G632,100 ± 2,400
4D562,300 ± 2,600
Governor pressure kPa1,000 r/min137 ± 166
2,000 r/min245 ± 284
3,200 r/min402 ± 460
Line pressure kPaAt idle speedD range480 ± 558
R range735 ± 852
At stall speedD range1,019 ± 1,195
R range1,519 ± 1,911
Operation temperature of engine coolant
temperature switch
C
On (continuity)50 + 3
tem erature switch
C
Off (no continuity)43
Clearance between shift lever guide and steering column mm2.4 ± 3.6

AUTOMATIC TRANSMISSION ± Troubleshooting23-4
TROUBLESHOOTING23100760152
STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING
Automatic transmission malfunctions may be caused by the following conditions.
(1) Improper maintenance and adjustment
(2) Shift control system malfunction
(3) Mechanical malfunctions
(4) Hydraulic malfunctions
(5) Poor engine performance
Troubleshooting in the event of any such malfunctions should begin by checking fluid level, ATF condition,
manual linkage adjustment, throttle control cable adjustment and other conditions whose deviation from
standards can be readily known. Then, road test shall be performed to determine whether or not the
problem has been corrected or more diagnosis is necessary. If the problem still persists after these tests
and corrections, hydraulic tests should be performed for further troubleshooting.
Road test (guess what causes malfunc-
tion.)
Check how A/T works in each drive
range to find a defective system.
A/T control component inspection
Check the throttle cable, inhibitor switch,
overdrive switch, overdrive solenoid
valve, overdrive control relay, defective
switch, engine coolant temperature
switch and vehicle speed sensor.
Torque converter stall test (Inspection
of engine performance and mechanical
function)
Check the engine performance, torque
converter operation and clutch and
brake sliding performance.
Hydraulic pressure test (Inspection of
hydraulic control mechanism)
Measure the fluid line pressure and
check for malfunctions of the oil pump
or regulator valve and for oil leaks.
Oil leak inspection
Visually check gaskets and oil seals for
leaks.
Adjustment of basic inspection items
ROAD TEST 23100780158
Prior to performing road test, be sure to make basic checks including check and adjustment of fluid
level and condition and adjustment of the throttle cable. For road test, the transfer must be placed in
the 2H (2WD-high) position. In road test, various changes such as slips in transmission and shifting
conditions are checked and the transmission operation at each shift position must have been checked.

AUTOMATIC TRANSMISSION ± Troubleshooting23-6
Ye s
Carry out TEST 4 again.
Ye s
Does the engine brake function in L range?NoBrake No. 3 malfunction
No
Does the engine brake function in 2 range?NoBrake No. 1 malfunction
TEST 4
When traveling in 3-speed or 4-speed, shift to 2 and L. Does the
engine brake function in each range?Ye sTEST 5
Ye s

High line pressure

Accumulator malfunction

Check ball malfunctionCarry out TEST 5 again.
TEST 5
Is there abnormal noise(s) during acceleration and deceleration?
Is there shocks when slipping and changing speed?NoTEST 6
Ye s

Incorrect torque converter installation

Oil pump malfunction

Shifting gear not meshing correctly

Incorrect drive plate installationCarry out TEST 6 again.
TEST 6
Is there abnormal noise(s) or vibration when traveling in 3-speed
or 4-speed?NoTEST 7
NOTE
Abnormal noises and vibrations are often caused by an unbalanced propeller shaft, differential, tyre,
torque converter, engine, etc. Extremely thorough inspection is therefore required.
Ye s
Carry out TEST 7 again.
Ye s
Does lock up go on, off?No
Lock up signal valve malfunction

Lock up relay valve malfunction

Lock up clutch malfunction
No
Does the moment when lock up turns ON or OFF conform with
the shift pattern?No
Governor malfunction

Line pressure malfunction
TEST 7
Check that lock up ON, OFF. Does the shifting points conform
with shift pattern?Ye sCarry out the road test in 2 range.
NOTE
(1) Determine the moment when lock up turns ON by decreased engine r/min or by a slight shock back
and forth.
(2) Determine the moment when lock up turns OFF by increased engine r/min.
(3) Check lock up condition by pumping the accelerator slightly. If engine r/min rises in accordance with
throttle valve opening size, determine that the lock up is OFF, if not, determine it ON.
(When lock up is OFF, drive power is transferred through the fluid in the torque converter and therefore,
when the accelerator pedal is depressed, slipping occurs inside the torque converter with a resulting
large increase in engine r/min.)

REAR AXLE ± Service Specifications27-4
SERVICE SPECIFICATIONS27100030121
ItemStandard valueLimit
Rear axle total backlash mm±5
Axle shaft axial play mmVehicles without ABS or rear differential lock0.05 ± 0.20±
Vehicles with ABS or rear differential lock0 ± 0.25±
Limited slip differential
p
reload Nm
Using special tool13 or more±
reload Nm
Without using special tool25 or more±
Axle shaft retainer
press-fitting force NVehicles without ABS or rear differential lockInitial press-fitting force
49,000 or more±
Final press-fitting force
78,000±
Vehicles with ABS or rear differential lockInitial press-fitting force
49,000 or more±
Final press-fitting force
98,000 ± 108,000±
Clearance between axle shaft retainer and snap ring mm0 ± 0.166±
Rear differential lock air pump pressure kPa25 ± 40±
Drive gear backlash mm2WD0.08 ± 0.13±
4WD0.13 ± 0.18±
Drive gear runout mm±0.05
Differential gear backlash mm2WD0 ± 0.250.2
4WD0 ± 0.0760.2
Limited slip differential
starting torque Nm
When a new clutch plate is used39 ± 74±
starting torque Nm
When re-installing current clutch plate25 ± 74±
Drive pinion
turning torque NmWithout oil sealWhen replacing
(with anti-rust agent)0.6 ± 0.9±
When replacing or reusing
(with gear oil applied)0.4 ± 0.5±
With oil sealWhen replacing
(with anti-rust agent)0.8 ± 1.1±
When replacing or
reusing (with gear oil applied)0.6 ± 0.7±

REAR AXLE ± Service Specifications/Lubricants/Sealants27-5
ItemStandard valueLimit
Horizontal difference between friction plate and friction disc thickness mm0 ± 0.05±
Clearance between friction plate and friction disc mm0.06 ± 0.20±
Clearance in side gear axial direction mm0.05 ± 0.20±
Difference between left and right dimensions from back thrust face of pressure
ring to end of thrust washer mm0 ± 0.05±
Friction plate and friction disc warping (flatness) mm±0.08
Friction plate and friction disc wear
(difference in the thickness of the friction surface and the projections) mm±0.1
LUBRICANTS27100040049
ItemSpecified lubricantsQuantity
Rear differential gear oil
Conventional differential:
Hypoid gear oil
API classification GL-5 or higher SAE viscosity No. 90,
80 W

Limited slipdifferential:
2WD1.6


Limited sli differential:
Hypoid gear oil
MITSUBISHI Genuine Gear Oil Part No. 8149630 EX
CASTROL HYPOY LS (GL-5, SAE 90), SHELL-LSD
(GL-5, SAE 80W-90) or equivalent4WD2.6

SEALANTS27100050042
ItemsSpecified sealantsRemarks
Bearing case3M ATD Part No. 8661 or equivalentSemi-drying sealant
Dust cover
Axle housing (differential carrier mounting part)
Drive gear and differential case mounting part3M Stud Locking 4170 or equivalentAnaerobic sealant

STEERING ± Service Specifications37A-3
SERVICE SPECIFICATIONS37100030021
ItemsStandard valueLimit
Steering wheel free play mmWith engine running±50
With engine stopped10 or less±
Steering angle2WDInner wheel33
55' ± 36
55'±
Outer wheel30
57'±
4WDInner wheel29
40' ± 32
40'±
Outer wheel29
30'
Steering gear backlash mm±0.5
Variation of tie rod end ball joint shaft direction mm±1.5
Tie rod end ball joint starting torque Nm3.0±
Steering gear oil level mm22±
Engine idle speed r/min4G6750 + 100±
4D56750 + 100±
Stationary steering effort N39.2 or less±
Oil pump
p
ressure MPa
Oil pump relief pressure8.3 ± 9.0±
ressure MPa
Pressure under no-load conditions0.8 ± 1.0±
Steering gear retention hydraulic pressure8.3 ± 9.0±
Oil pressure switch operating pressure MPaOFF
ON1.5 ± 2.0±
ON
OFF0.7 ± 1.2±
Mainshaft starting torque Nm0.49 ± 0.78±
Cross-shaft axial play mm0.05 or less±
Mainshaft total starting torque Nm<2WD>0.98 ± 1.47±
<4WD>0.69 ± 1.28±
Pitman arm ball joint starting torque Nm0.5 ± 1.5±
Mainshaft axial play mm0.03 or less±
Backlash between ball groove of rack piston and balls mm±0.05
Idler arm sliding resistance N2WD8.8 ± 30±
4WD2.4 ± 16±

± General Information HEATER, AIR CONDITIONER
AND VENTILATION55-3
GENERAL INFORMATION55200010121
The heater system uses a two-way-flow full-air-mix
system that features high performance and low
operating noise, and includes an independent face
air blowing function and a cool air bypass function.The A/C system is basically the same as the
conventional system, but a new refrigerant system
has been adopted as a response to restrictions
on the use of chlorofluorocarbons.
ItemsSpecifications
Heater unitTypeTwo-way-flow full-air-mix system
Heater control assemblyDial type
CompressorModelInclined-plate type
Dual pressure switch
kPa
High-pressure switchON
OFF: 2,648, OF
F ON: 2,059
kPa
Low-pressure switchON
OFF: 177, OFF
ON: 186
Refrigerant and quantity gR-134a (HFC-134a), Approx. 550 ± 600
SAFETY PRECAUTIONS
Because R-134a refrigerant is a hydrofluorocarbon
(HFC) which contains hydrogen atoms in place of
chlorine atoms, it will not cause damage to the
ozone layer.
Refrigerant R-134a is transparent and colourless
in both the liquid and vapour state. Since it has
a boiling point of ± 29.8
C, at atmospheric pressure,
it will be a vapour at all normal temperatures and
pressures. The vapour is heavier than air,
non-flammable, and nonexplosive. The following
precautions must be observed when handling
R-134a.Caution
Wear safety goggles when servicing the
refrigeration system.
R-134a evaporates so rapidly at normal
atmospheric pressures and temperatures that it
tends to freeze anything it contacts. For this reason,
extreme care must be taken to prevent any liquid
refrigerant from contacting the skin and especially
the eyes. Always wear safety goggles when
servicing the refrigeration part of the A/C system.
Keep a bottle of sterile mineral oil handy when
working on the refrigeration system. Should any
liquid refrigerant get into the eyes, use a few drops
of mineral oil to wash them out. R-134a is rapidly
absorbed by the oil. Next splash the eyes with
plenty of cold water. Call your doctor immediately
even though irritation has ceased after treatment.