1991 MITSUBISHI 3000GT Service Manual

ENGINE - Winder Head Gasket11-23
CYLINDER HEAD GASKETREMOVAL AND INSTALLATION
MllJA-6
Pre-removal and Post-installation Operation
Draining and Supplying
l Engine Coolant(Refer to GROUP 00 -Maintenance Service.)Removal-and Installationl Air Intake Manifold(Refer to GROUP 15 -Air intake Manifold.)l Turbocharger (Refer to GROUP 15 -Turbocharger.)l Exhaust Manifold(Refer to GROUP 15 - Exhaust Manifold.)l Timing Belt(Referto P.l I-26.)
10 Nm3Nm
2.2 klbs.P
~~(Refer to GROUP 13 - Engrne Control.)
10 Nm7 ft.lbs.
7 ft.lbs.\
.- .-.../A- Q/-s+: 11 ft.lbs.
120-nng
‘3, ;
%
;;
Water01 LO21
7
i2o-IjONmY rt.lDS.
87
- 94 ft.lbs.
76 - 83 ft.lbs.d
fl (Turbo)i20-130 Nm87 - 94 ftlbs.(Non-turbo)105-115Nm76 - 83 ft.lbs.Removal steps
I. Pipe assembly
2. Blow-by hose
90
Nm3. Center cover (Front bank)
4. Spark plug cable
HI 5. Rocker cover4* l a
I
6. Intake camshaft sprocket7. Timing belt rear cover (Cent
7.----A//OlFOO218. Ignition coil9. Connection of heater hose10. Connection of water hoses
Rocker coverIOmm
410mm(.4 in.)1.4 in.)
OlA004;
Sealant: 3M ATD Part
No. 8660 or equivalent
.er)
tl-urbo>11. Connection of radiator hose
12. Thermostat housing
13. Connection of water inlet pipe** l + 14. Cylinder head assembly** 15. Cylinder head gasket
(Front bank)TSB Revision

11-24ENGINE - Cylinder Head Gasket
ldentlfrcatlonmark
01 N009iOlL0472
0111044
JI
j:: 1: :: ::p:i
c1
Q80401Q5 c
Frontbank074930296
- OlL105j8
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5SERVICE POINTS OF REMOVALMllJBBF
6. REMOVAL OF INTAKE CAMSHAFT SPROCKET
(1) Using a wrench, hold the camshaft at its hexagon and
remove the camshaft sprocket bolt.
Caution
Locking the camshaft sprocket with a tool damages
the sprocket.(2) Remove the camshaft sprockets.
14. REMOVAL CYLINDER HEAD ASSEMBLYUsing the special tool, remove the cylinder head assembly.
SERVICE POINTS OF INSTALLATION
MllJDEJ
15. INSTALLATION OF CYLINDER HEAD GASKET
(1) Make sure that the gasket has the proper identification
mark for the engine.
(2) Lay the cylinder head gasket on the cylinder block with
the identification mark at the front top.
14. INSTALLATION OF CYLINDER HEAD ASSEMBLY
(1)Use a scraper to clean the gasket surface of the cylinder
head assembly.
CautionTake care that no foreign material gets into the
cylinder, coolant passages or oil passages.
(2) Using the special tool and a torque wrench, tighten the
bolts to the specified torque in the order shown in the
illustration. (in two or three cycles)
CautionInstall the head bolt washers with shear droop
upward as shown in the illustration.
(3) Back off the bolts once and tighten them to the
specified torque as shown in step (2).

ENGINE - Cylinder Head Gasket11-25
Rear bank
6 011 010 09
Front bank
6
OlL105C6. INSTALLATION OF INTAKE CAMSHAFT SPROCKET
Using a wrench, hold the camshaft at its hexagon and
tighten the bolt to specification.
Caution
Locking the camshaft sprocket with a tool damages the
sprocket.5. INSTALLATION OF ROCKER COVER
Tighten the rocker cover bolts in the order shown in the
illustration.
NOTE(1) Only No. 5 bolt in the rear bank differs from other bolts
in length.
Rear bank No. 5 bolt._.._.._........._._____.__.._.. 20 mm (.79 in.)
Except rear bank No. 5 bolt
.._._............... 10 mm (.39 in.)
(2) Bolts are color-coded for the front and rear banks as
follows:
Front bank
__.._................_.......................................... Black
Rear bank . . . . . . . . . . ..___..................................._._._.............Green(3) When the rocker cover gasket has been replaced,
tighten bolts in this order, and then retighten bolts 1 to 6
to 4 Nm (2.9 ft.lbs.).
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11-26ENGINE - Timing Belt
TIMING BELT
REMOVAL AND INSTALLATION
MllKA-BI
Pre-removal Operationl Removal of the Under Cover (Front L.H.,side L.H.)l Removal of Front Under Cover Panel(Refer to GROUP 51 -Aero Parts,)l Removal of Cruise Control Pump andLink Assembly(Refer to GROUP 13 -Cruise Control.)l Removal of Alternator Assembly(Referto GROUP 16-Alternator.)
l Raise and Suspend the Engine to the ExtentForce is not Applied to the Engine Mounti LIOO-
120 Nm72 - 87 ft.lbs.
35 Nm25 ft.l$.
TurbochargerOSFOO03
lo-12Nm7 - 9 ft.lbs.
Removal steps
1. Air hose
11 31 ftlbs.
‘5IO-12Nm
B;p 49ftJbs.
\
180- 190 Nm130 - 137 ft.lbs.
2. Air pipe
3. Tensioner assembly
4. Drive belt (power steering)
(RefertoP.ll-11.)4** I)* 5. Crankshaft pulley’6. Brake fluid level sensor
7. Timing belt upper cover
8. Engine mount bracket
9. Idler pulley (alternator
/ air conditioner)+* l * 10. Engine support bracketl * 11. Timing belt lower coverl * lAdjustment of timing belt tensionl * l a 12. Timing beltl * 13. Auto tensionerNm
[email protected].
Post-installation Operation
l Installation of Alternator Assembly(Refer to GROUP 16 -Alternator.)
l Installation of the Under Cover(Front L.H., Side L.H.)l Installation of Front Under Cover Panel
l Installation of Cruise Control Actuator(Refer to GROUP 13 - Cruise Control.)l Adjustment of theEngine (Refer to P.l l-1 1.)n7 m-m
M D998754nSERVICE POINTS OF REMOVAL
5. REMOVAL OF CRANKSHAFT PULLEYMllKBEF
,Using special tools, remove the crankshaft pulley from the
crankshaft.
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CautionUse only the specified special tools, or a damaged
pulley damper could result.
,
LJ

ENGINE - Timinn Belt11-27
r bol
I01 NO07
10. REMOVAL OF ENGINE SUPPORT BRACKETRemove the engine support bracket in the numbered
sequence shown in the illustration.
Spraying lubricant, slowly remove the bolt (reamer bolt)
indicated by the arrow.
CautionKeep in mind that the reamer bolt is sometimes heat
seized on the engine support bracket.
Timing mark
mshaftrocket01 N009:
d Soft jawSoft jaw
OlL104E
Set hole
n
12. REMOVAL OF TIMING BELT(1) Align the timing marks.
(2) Make a mark on the back of the timing belt indicating
the direction of rotation so it may be reassembled in the
same direction if it is to be reused.
(3) Loosen the center bolt on the tensioner pulley to
remove the timing belt.
Caution
Water or oil on the belt shorten its life drastically, sothe removed timing belt, sprocket, and tensioner
must be free from oil and water. These parts should
not be washed. Replace parts if seriously contamin-
ated.
If there is oil or water on each part check. the front
case oil seals, camshaft oil seal and water pump for
leaks.SERVICE POINTS OF INSTALLATION
MllKDDB
13. INSTALLATION OF AUTO TENSIONER
(‘I) If the auto tensioner rod is in its fully extended position,
reset it as follows.@ Keep the auto tensioner level
and: in that position,
clamp it in the vise with soft jaws.@ Push in the rod little by little with the vise until the
set hole @ in the rod is aligned with that @ in the
cylinder.
CautionPush in the rod slowly to prevent the push rod
from being damaged.@ Insert a wire [I
.4 mm (.055 in.) in diameter] into the
set
ho&.@ Unclamp the auto tensioner from the vise.
(2) Install the auto tensioner.
CautionLeave the wire installed in the auto tensioner.
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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.

ENGINE - Timing Belt11-29
OlN004t
& Pin hole
nilnq
8(2) Using paper clips, install the timing belt in the following
order with care not to allow the belt to slack.@ Exhaust camshaft sprocket (front bank side)
+ @
Intake camshaft sprocket (front bank side)
-+ @Waterpump pulley
+ @ Intake camshaft sprocket (rear bank
side)
+ @ Exhaust camshaft sprocket + @ Idler pulley
-+ @ Crankshaft sprocket + @ Tensioner pulley
NOTESince the camshaft sprockets turn easily, secure them
with box wrenches to install the timing belt.
Caution1. Be careful, the camshaft is turned by the reac-
tion of valve spring.
2.If the timing belt is reused, install it so that thearrow marks made at removal are in the direc-
tion of rotation.
(3) Turn the tensioner pulley so that its pin holes are
located above the center bolt. Then, press the tensioner
pulley against the timing belt and, at the same time,
temporarily tighten the center bolt.
(4) Check that the timing marks on all sprockets are aligned
properly.
(5) Remove the four clips.
. ADJUSTMENT OF TIMING BELT TENSION
(1) Rotate the crankshaft
114 turn counterclockwise, then
rotate it clockwise until the timing marks are aligned.
(2) Loosen the center bolt on the tensioner pulley. Using
the special tool and torque wrench, apply tensioning
torque to the timing belt and, at the same time, tighten
the center bolt to specification.
Specified torque:
10 Nm (7 ftlbs.)
[Timing belt tensioning torque]
Caution
When tightening the center bolt, make sure that thetensioner pulley is not rotated together.
(3) Remove the set pin from the auto tensioner. At this
time, make sure that the set pin can be easily removed.
(4) Rotate the crankshaft two turns clockwise and leave it
as is for five minutes or more. Then, check again that
the set pin can be easily removed from, and installed to,
the auto tensioner.
NOTEEven if the set pin cannot be easily inserted, the auto
tensioner is normal if its rod protrusion is within
specification.
Standard value (A): 3.8
- 4.5 mm (.I49 - .I77 in.)
If the protrusion is out of specification, repeat steps (1)
to (4).
(5) Check again that timing marks on all sprockets are
aligned properly.
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II-30ENGINE - Timing Belt
hread diameter x length
mm (In.)
6x201.23 x ,781fllllO4F
1 Thread diameter x Lengthmm (in.)
2(39
x1.06)l.47 x 2.50)OlN0072
11. INSTALLATION OF TIMING BELT FRONT COVER (LOW-
ER)Since the mounting bolts of timing cover are different in
size depending on location, insert them with care.
.\J
10. INSTALLATION OF ENGINE SUPPORT BRACKETSince the mounting bolts of engine support bracket are
different in size depending on location, insert them in
numbered sequence.
CautionWhen installing the reamer bolt, tighten it, slowly
spraying lubricant on the reamer area.
\/,,fjd99p54-II5. INSTALLATION OF CRANKSHAFT PULLEY
Using the special tool, attach the crankshaft pulley to the
crankshaft.
CautionUse only the specified special tools, otherwise a
:damaged pulley damper could result.
d
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