1991 MITSUBISHI 3000GT light

GENERAL - Precautions before Service0045
c
mm (in.)so005
PRECAUTIONS BEFORE SERWCEMOOOAAOSERVICING ELECTRICAL SYSTEM
1. Note the following before proceeding with work on the
electrical system.
Note that the following must never be done:
Unauthorized modifications of any electrical device or
wiring, because such modifications might lead to a vehicle
malfunction, over-capacity or short-circuit that could result
in a fire in the vehicle.
2. When servicing the electrical system, disconnect the
negative cable terminal from the battery.
Caution1. Before connecting or disconnecting the negative
cable, be sure to turn off the ignition switch and the
lighting switch.(If this is not done, there is the possibility of
semiconductor parts being damaged.)
2. After completion of the work steps [when the
battery’s negative (-) terminal is connected], warm
up the engine and allow it to idle for approximately
five minutes under the conditions described below,in order to stabilize the engine control conditions,
and then check to be sure that the idling is
satisfactory.
Engine coolant temperature: 80 - 95°C (176 - 203°F)
Lights, electric fans, accessories: OFF
Transaxle: neutral position(A/T models: “N” or “P”)
Steering wheel: neutral (center) position
VEHICLE WASHING
If high-pressure car-washing equipment or steam car-washing
equipment is used to wash the vehicle, be sure to maintain the
spray nozzle at a distance of at least 300 mm (12 in.) from any
plastic parts and all opening parts (doors, luggage compart-
ment, etc.).
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GENERAL - Tightening Torque00-23TIGHTENING TORQUE
MOOJA- -Each torque value in the table is a standard value for tightening under the following conditions.
(1) Bolts, nuts and washers are all mode of steel and plated with zinc.
(2) The threads and bearing surface of bolts and nuts are all in dry condition.
The values in the table are not applicable:
(1) If toothed washers are inserted.
(2) If plastic parts are fastened.
(3) If bolts are tightened to plastic or die-cast inserted nuts.
(4) If self-tapping screws or self-locking nuts are used.
Standard bolt and nut tightening torque
Bolt nominaldiameter(mm)
M5
M6
M8
Pitchb-m-n)
0.8
1.0
1.25
Head mark @
2.5 (1.8)
5.0 (3.6)
12 (8.7)
Torque Nm (ft.lbs.)
Head mark @
5.0 (3.6)
9.0 (6.5)
22 (16)
Head mark @
6.0 (4.3)
10 (7.2)
25 (18)
M241.5400 (289)Flange bolt and nut tightening torque750 (542)870 (629)
Ml21.7543 (31)83 (60)98 (71)Taper thread tightening torque
Thread sizeTorque Nm (ft.lbs.1
Female thread material: Light alloyFemale thread material: Steel
NPTF 116I7.0 (5.1)I10 (7.2)I
PT 11810 (7.2)18 (13)
/I
idPT 114, NPTF 11425 (18140 (29)
PT 31848 (35)68 (49)
NOTE: NPTF is dry seat pipe thread, whrle PT IS pipe thread.
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GENERAL - Maintenance Service00-43
15. DRIVE SHAFT BOOTS (Inspect for grease
leaks and damage)
MOOSBJD1. These components, which are permanently lubricated at
the factory, do not require periodic lubrication. Damaged
boots should be replaced to prevent leakage or contamina-
tion of the, grease.
2.Inspect the boots for proper sealing, leakage and damage.
Replace it if defective.
16. REAR AXLE (CONVENTIONAL DIFFEREN-
TIAL) (Inspect oil level)
- AWDMOOSBPDRemove the filler plug and inspect the oil level at bottom of filler
hole. If the oil level is slightly below the filler hole, it is in
satisfactory condition.
16. REAR AXLE (LIMITED-SLIP DIFFERENTIAL)
(Oil change)
- AWDMOOSBQEBefore changing the rear axle oil, check to make sure that there
is no oil leakage from the rear axle housing.
Remove the drain plug and drain out of the oil.
Put the oil plug
,back in place, and then pour new oil in through
the filler hole.
17. EXHAUST SYSTEM (CONNECTION PORTION
OF MUFFLER, PIPINGS AND CONVERTER
HEAT SHIELDS) (Check and service as re-
quired)
MOOSBLB1. Check for holes and gas leaks due to damage, corrosion,
etc.
2. Check the joints and connections for looseness and gas
leaks.3. Check the hanger rubber and brackets for damage.
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ENGINE - Service Adiustment ProceduresII-13
I_ ianltion tlminaI!H Connector for Igdpstment 6rown)
4tll II -7FUO9371IGNITION TIMING ADJUSTMENTMllFLAF
(1) The vehicle should be prepared as follows before the
inspection and adjustment.
lEngine coolant temperature: 80 - 95°C (176 - 205°F)
l Lights, electric cooling fan and accessories: OFF
l Transaxle: neutral
(P for A/T)l Steering wheel: neutral position
(2) Insert a paper clip to the connector, and connect a
tachometer to the paper clip.
NOTEDo not use the Multi-use tester.
If tested with the Multi-use tester connected to the
diagnosis connector, the ignition timing will not be the basic
timing but be ordinary timing.
(3) Set the timing light.
(4) Start the engine and run at idle.
(5) Check curb idle speed.
Curb idle speed: 700
f 100 rpm
NOTEThe engine speed indicated is a third of actual speed. In
other words, the reading of the tachometer times 3 is actual
speed.
(6) Turn OFF the ignition switch.
(7) Using a jumper wire, ground the ignition timing adjusting
terminal.
NOTEGrounding this terminal sets the engine to the basic ignition
timing.
\(8) Start the engine and run at idle.
(9) Check basic ignition timing.
Basic ignition timing: 5” BTDC
k 2”
(10)lf not within the standard value range, loosen the crank
angle sensor mounting nut and adjust by turning the crank
angle sensor. Turning it to the counterclockwise retards
timing, and to the clockwise advances it.
(1 l)After adjustment, tighten mounting nut taking care not to
move the crank angle sensor.
(12)Turn OFF the ignition switch.
(13)Disconnect the jumper wire connected at step (7).
(14)Start and run the engine at curb idle speed.
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11-14ENGINE - Service Adjustment Procedures
(15)Check to be sure that the idling ignition timing is the correct
timing.
Actual ignition timing: Approx. 15” BTDC
NOTE:d
(1) Ignition timing is variable even under normal operation.
(2) And it is automatically advanced at higher altitudes.
CURB IDLE SPEED INSPECTIONMllFMAB
(1) The vehicle should be prepared as follows before the
inspection.
lEngine coolant temperature: 80 - 95°C (176 - 205°F)
l Lights, electric cooling fan and accessories: OFF
l Transaxle: neutral
(P for A/T)l Steering wheel: neutral position
(2) Connect a tachometer. (Refer to P.l l-1 3.)
(3) Set a timing light.
(4) Using a jumper wire, ground the ignition timing adjusting
terminal.
(5) Start the engine and let it idle.
(6) Check whether or not the ignition timing is the standard
value; if not, adjust.
Standard value: 5” BTDC + 2”
NOTECheck the ignition timing with the Multi-use tester not
connected to the diagnosis connector.
(7) Remove the jumper wire from the ignition timing adjusting
terminal.
(8) When using the Multi-use tester, turn OFF the ignition
switch and connect the tester to the diagnosis connector.
(9) Idle the engine for two minutes.
(10)Check the idle speed.
Curb idle speed:
700 + 100 rpm
NOTE(1) The idling speed is automatically regulated by the
idle-speed control system.
(2)’ The engine speed indicated is a third of actual speed. In
other words, the reading of the tachometer times 3 is
actual speed.
(1l)lf not within the standard value range, refer to GROUP 13 -Service Adjustment Procedures.
d
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11-16ENGINE - Service Adjustment Procedures
MANIFOLD VACUUM INSPECTION
MllFNAR
(1) The vehicle should be repaired as follows before the
inspection.
lEngine coolant temperature: 80 - 95°C (176 - 205°F)‘dl Lights, electric cooling fan, and accessories: OFF
l Transaxle: Neutral
(P for A/T)l Steering wheel: neutral position
(2) Connect a tachometer. (Refer to P.l l-l 3.)
(3) Disconnect the vacuum hose from the nipple for taking off
fuel pressure regulator vacuum from the air intake plenum.
(4) Conncet a three-way joint between the removed vacuum
hose and the nipple and connect a vacuum gauge to the
joint.
(5) Start the engine and check that idle speed is within the
standard value range.
(6) Check the manifold vacuum.
Standard value:
*
Approx. 520 mmHg (20 in.Hg)
Approx. 495 mmHg (19 in.Hg)LASH ADJUSTERS CHECK
Ml 1 FEAFIf an abnormal noise is heard from the lash adjusters, check as
follows.
(1) After warming up the engine, stop it.
(2) While installed to the cylinder head, press the part where
the rocker arm contacts the lash adjuster at the very top. If
the adjuster is normal, the part pressed will feel very hard.
d
(3) If it easily moves all the way downward when pressed,
there is a malfunction of the lash adjuster and it should be
replaced with a new one.
(4) If it feels spongy or elastic, probably oil with air mixed in it
has entered the lash adjuster. Check whether the amount
of oil is too much or is not enough and the cause of air
becoming mixed into the oil is a damaged oil screen or oil
screen gasket.
(5) After repairing the cause of the air leak, warm up the engine
and then drive the vehicle at low speed for a while. Stop the
engine and leave it off for a few minutes; then restart the
engine and drive at low speed. Repeat this procedure
several times during the course of about one hour so as to
remove the air from the oil.
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11-28ENGINE - Timing Belt
Tlmlng mark01 N009E
A : :y,y;i;,$yi *&:;.~:;>
Exhaust valveside
*
/’*
120"* -1"
(*
6
7.^^^J‘c;Y
1zv w**
Intake valveside
Front bank
* : Approx. 35” o1 N0, og
Rockercoverslde
Exhaust valveside
Front bank
t~mng markOlNOlO
12. INSTALLATION OF TIMING BELT
(1) Align the timing marks on the respective sprockets.
In case of the camshaft sprockets in the front bank,
I~
proceed as follows:@ Install the crankshaft pulley. Shift the timing mark
on the crankshaft sprocket by three teeth to lower
the piston in No. 1 cylinder slightly from the top
dead center on compression stroke.
CautionTurning the camshaft sprocket with the piston
in No. 1 cylinder located at TDC on compression
stroke may cause the valves to interfere with the
piston.@ Make sure that the timing marks on the camshaft
sprockets for intake and exhaust valves are not
within the range A in the illustration at left.
If the timing mark is within range A, turn the
camshaft sprocket to move the timing mark to the
area closest to the range A.
CautionIn range A, the cam lobe on the camshaft lifts
the valve through the rocker arm and the
camshaft sprocket is apt to rotate by reaction
force of the valve spring. Therefore, be careful
not to have the finger pinched between the
sprockets.@ Turn the camshaft sprocket for either the intake or
exhaust valve to locate the timing mark as shown in
\the illustration at left. Then turn the other crankshaft
to locate the timing mark-as shown in the illustration
at left.
CautionIf the intake and exhaust valves of the same
cylinder lift simultaneously, interference with
each other may result. Therefore, turn the intake
valve camshaft sprocket and the exhaust valve
camshaft alternately.@ Turn the camshaft sprocket clockwise to align the
timing marks.
If the camshaft sprocket has been turned excessive-
ly, turn it counterclockwise to align the timing
marks.
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.@ Align the timing mark of the crankshaft sprocket.
NOTEShift the timing mark of the crankshaft sprocket one
teeth in counterclockwise direction to facilitate belt
installation.

11-32ENGINE - Rocker Arm and Camshaft
r
I
/7EN024E
Small wire
8ENOO58
Identification mark(stamped on hexagon section)
7EN0249
Front sideINSPECTION
MllZCAB
CAMSHAFTMeasure cam height (longer diameter of the cam). If it exceeds
the limit, replace the camshaft.
Standard value:
Intake side
35.49 mm (1.3972 in.)
Exhaust side
35.20 mm (1.3858 in.)
Limit:
Intake side
34.99 mm (1.3776 in.)
Exhaust side
34.70 mm (1.3661 in.)SERVICE POINTS OF INSTALLATION
MllZDAK
11. INSTALLATION OF LASH ADJUSTER
(1) Immerse the lash adjuster in clean diesel fuel.
(2) Using a small wire, move the plunger up and down 4 or
5 times while pushing down lightly in the check ball in
order to bleed out the air.
(3) Install the lash adjuster to the cylinder head.
9. INSTALLATION OF CAMSHAFT
(1) Turn the crankshaft to bring No.1 cylinder to the top
dead center.
(2) Check that the rocker arm is installed correctly on the
lash adjuster and valve.
(3) Install the camshaft noting the identification mark
(stamped on the hexagon sectioned).
Identification mark: Intake sideV
Exhaust side C
(4) Install the camshafts with their dowel pins positioned
as shown in the illustration.
Rear side ,
Approx. 100”
Pl
Frontm&k
M
0
/
Cap No
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Identificationmark
7EN03168. 7. 6. 4. 2. INSTALLATION OF BEARING CAPS
(1) Install noting the identification mark and cap No. No.2, 3
and 4 bearing caps bear the front mark. Install these
caps with the mark lined up with the front mark on the
cylinder head.
Identification mark: Intake side
IExhaust side E