1991 MITSUBISHI 3000GT torque

II-12ENGINE - Service Adjustment Procedures-
r
AdJl
bolt
Alternator wllev
haft
Fixing nutOlFOOO8
Alternator pulley
Adjusting bolt
/Crankshaftpulley
Air contionercompressorpulleyw Tension pulleyFlxtng nutOlN007.
Crankshaft pulleyOlN007TENSION ADJUSTMENT OF THE ALTERNATOR DRIVE
BELT
I(1) Remove front under cover panel ’
aero> (Refer to GROUP 51 - Aero Parts.).\\
3 ’
(2) Remove under covers (front L.H., side L.H.).
(3) Loosen tension pulley fixing nut.
(4) Adjust belt deflection with adjusting bolt.
(5) Tighten fixing bolt.
(6) Run the engine one time or more.
(7) Check the belt tension. Readjust, if necessary.
(8) Install under covers.
DEFLECTION ADJUSTMENT OF THE ALTERNATOR AND
AIR CONDITIONER COMPRESSOR DRIVE BELT with air conditioner>
(1) Use straight handle box wrench to loosen tension pulley
fixing nut.
(2) Adjust belt deflection with adjusting bolt.
(3) Use straight handle box wrench to tighten fixing nut.
(4) Run the engine one time or more.
(5) Check the belt deflection. Readjust, if necessary.
DEFLECTION ADJUSTMENT OF POWER STEERING PUMP
DRIVE BELT(1) Insert an extension bar (insertion depth 12.7 mm), etc. into
the opening at the end of the tension pulley bracket.
(2) Loosen the tension pulley fixing bolts in the order of B and
(3)
iove the extension bar installed to the tension pulley in the‘LJdirection of arrow to adjust the belt tension.
(4) Tighten the tension pulley fixing bolts in the order of A and
8.Tightening torque: 35
- 50 Nm (25 - 36 ftlbs,)(5) Give the crankshaft two turns in normal direction (clock-
wise) to run in the belt.
(6) Check the belt deflection. Readjust, if necessary.
1 TSB Revision

11-24ENGINE - Cylinder Head Gasket
ldentlfrcatlonmark
01 N009iOlL0472
0111044
JI
j:: 1: :: ::p:i
c1
Q80401Q5 c
Frontbank074930296
- OlL105j8
TSB Revision
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 - 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.
TSB Revision

ENGINE - Rocker Arm and Camshaft11-33
About 10 mm C.39 In.17ENO248
i,(2) Tighten gradually in two or three steps and finally
tighten to specified torque.
(3) Measure the camshaft end play. Replace if the limit is
exceeded.
Standard value: 0.1
- 0.2 mm (.004 - .008 in.)
Limit: 0.4 mm
(.016 in.)
NOTEIf the bearing cap is installed with the cylinder cap
removed, the valve will protrude. Install, therefore, with
the cylinder head lifted by about
10 mm (.39 in.).
5. INSTALLATION OF CIRCULAR PACKING
Using the special tool, insert the circular packing.
3. INSTALLATION OF OIL SEAL
Using the special tool, insert the oil seal.
TSB Revision1

L
,
LENGINE
- Cylinder Head and Valve11-391. INSTALLATION OF CYLINDER HEAD BOLT
(1) Using the special tool, tighten the bolts in two to three
stages in the illustrated sequence.
(2) Back off the bolts once and tighten them to the
specified torque as shown in step (1).
7EN0262
TSB Revision

ENGINE - Crankshaft. Flvwheel and Drive Plate11-51
id
PLASTIGAGE METHODMllUlAA
Plastigage may be used to measure the clearance.
(1) Remove oil and grease and any other dirt from bearings and
journals.(2) Cut plastigage to the same length as the width of the
bearing and place it in parallel with the journal, off oil holes.
(3) Install the crankshaft, bearings and caps and tighten them
to the specified torques. During this operation, do NOT turn
the crankshaft. Remove the caps. Measure the width-of the
plastigage at the widest part by using a scale printed on the
plastigage sleeve.
If the clearance exceeds the repair limit, the bearing should
be replaced.
Should the standard clearance not be obtained even after
bearing replacement, replace the crankshaft.
SERVICE POINTS OF INSTALLATIONMllUDAM
16. INSTALLATION OF CRANKSHAFT BEARING (UPPER) /
15.10. THRUST BEARING A / 14.11. THRUST BEARING
B
/ 12. CRANKSHAFT BEARING (LOWER)
(1) Classify the crankshaft bearings (upper and lower) by
whether there is an oil groove or not. Then, assemble asshown in the illustration.
(2) Assemble the thrust bearings (A and
B) on the No.3
journal area as shown in the illustration.
CautionInstall them with the groove side facing outward.Crankshaft bearing (upper)
Oil groove
Thrust bearing A
Front of engine(Tlmlng belt side)
EN269
TSB Revision

11-52ENGINE - Crankshaft, Flywheel and Drive Plate
9. INSTALLATION OF BEARING CAP
(1) Attach the bearing cap on the cylinder block as shown in
the illustration.
(2) Tighten the bearing cap bolts to the specified torque in‘I
the sequence shown in the illustration.
J ~
(3) Check that the crankshaft rotates smoothly.
Cral
Bearing cap
\Bearing cap bolt
Front of engine
(Timing belt side)
7EN270(4) Check the end plate. If it exceeds the limit value,
replace the thrust bearing.
Standard value: 0.05
- 0.25 mm (.0020 - .0098 in.)
Limit: 0.3 mm
(.012 in.)
-rent ofengineTimingIelt side)
8.
LLiN03,ij
1 TSB RevisionINSTALLATION OF BEARING CAP STAY
(1) Apply engine oil to the thread and bearing surface of
each bolt.
(2) Temporarily tighten the bolts on the cylinder block side.(3) Tighten the bolts on the bearing cap side to specified
torque.(4) Finally, tighten the bolts on the cylinder block side to
specified torque.
NOTEThe bearing cap stays A and B differ in shape. Install
correct ones on correct sides.d

11-54ENGINE - Cylinder Block
I
$jA A@/
,12 mm (.47 in.)
I
t+ ‘: ;I 2 Center -
Thrust
direction
-point7EN268
(2) Using a cylinder gauge, measure the inside diameter and
roundness of the cylinder. If excessively worn, repair (over~
size) the cylinder and replace the piston and piston rings.The measurement points are shown in the illustration.
)d
BORING THE CYLINDERMllVEEB
(1) Based on the largest cylinder bore, determine the over
sized piston to be used.
(2) Measure with the outside diameter of the piston as the
datum measurement points.
NOTE
There are four sizes of oversize piston -0.25 mm (.OlO in.),
0.50 mm
(.020 in.), 0.75 mm (.030 in.), 1.00 mm (.039 in.).
(3) Calculate the reground bore size based on the measured.value of the outside piston diameter.
NOTEBore size = outside piston diameter + 0.03 to 0.05 mm
(.0012 to .0020 in.) (gap between cylinder and piston) - 0.02mm (0008 in.) (honing amount)
(4) Hone each of the cylinders to the calculated measurement.
CautionTo prevent distortion resulting from the temperature‘drise during reboring, bore the cylinder holes in the
cylinder numbers sequence.
(5) Hone the cylinders, finishing them to the proper dimension(outside piston diameter + gap with cylinder).
(6) Check the gap between the piston and cylinder.
Standard value: 0.03
- 0.05 mm (.0012 - .0020 in.)
SERWCE POINT OF INSTALLATIONMllVDAL
5. INSTALLATION OF DETONATION SENSOR BRACKET
Check that the bracket is in intimate contact with the
cylinder block boss and tighten to specified torque in the
order shown.
TSB Revision