MITSUBISHI 3000GT 1991 Owners Manual

ENGINE - Oil Pan and Oil Pump
Removal steps
1. Transaxle stay (front)
2. Transaxle stay (rear)
3. Oil pressure switch4.
Z:
;:9.10.l+11.l*12.** l * 13.
Oil pressure gauge unitOil filterOil cooler by-pass valve
Oil filter bracket stay
Oil filter bracket
Oil filter bracket gasket
Drain plugDrain plug gasket0; y; boltI
16. Relief plug17. Relief spring18. Relief plunger** 19. Crankshaft front oil seal
20. Oil pump case
21. Oil pump gasket
22. Oil pump cover
23. Oil pump outer rotor
24. Oil pump inner rotor
14. Oil screen
15. Oil screen gasket
Side
clearance
BodyclearanceSERVICE POINTS OF REMOVALMllRBBB
13. REMOVAL OF OIL PAN
(1) Knock the special tool in deeply between the oil pan and
cylinder block.
(2) Hitting the side of the special tool, slide and remove the
oil pan.
INSPECTION
OIL PUMPMllRKAB
Assemble the rotor on the oil pump and check the clearance
with a feeler gauge.
Standard value:
Body clearanceO.lOO- 0.181 mm (.0039 - .0071 in.)
Side clearance0.040 - 0.095 mm (.0016 - .0037 in.)
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II-42ENGINE - Oil Pan and Oil Pump
6LUOl;
Oil pumpcase7EN0139
Sealant coating area(Top view)
4 mm (. 16 in.) diameterOIL COOLER BY-PASS VALVE
(1) Make sure that the valve moves smoothly.
(2) Ensure that the dimension L measures the standard value
under normal temperature and humidity.
Dimension L: 34.5 mm (1.358 in.)
(3) The dimension must be the standard value when measured
after the valve has been dipped in 100°C (212°F) oil.
Dimension L: 40 mm (1.57 in.) or more
SERVICE POINTS OF INSTALLATIONMllRDEC
19. INSTALLATION OF CRANKSHAFT FRONT OIL SEALUsing the special tool, knock the oil seal into the oil pump
case.
NOTEKnock it as far as the surface.
13. APPLICATION OF SEALANT TO OIL PAN
(1) Apply specified sealant all around the oil pan flange to a
diameter of 4 mm
(.I6 in.).
Specified sealant: MITSUBISHI Genuine Part No.
MD9971 10 or equivalent(2) Install the oil pan within 15 mins. after applying the
liquid gasket.
Dead sealant
Groove areaBolt hole area7EN0305
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/
iENGINE
- Oil Pan and Oil Pump11-43
Tlghtenlng sequence of flange bolts(bottom view)
iTiming beltside)7EN030f
7EN030
12. TIGHTENING SEQUENCE OF OIL PAN BOLTTighten the flange bolts in the sequence shown in the
illustration.illustration.
11. INSTALLATION OF DRAIN PLUG GASKETInstall the drain plug gasket in the direction shown in the
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11-44ENGINE - Piston and Connecting Rod
PISTON AND CONNECTING RODREMOVAL AND INSTALLATIONMllTA--
r
Removal steps
1. Nutl * I)*2. Connecting rod cap
l *3. Connecting rod bearing (lower)
4. Piston, connecting rod assembly
1_ ._5. $nnec$ng. rod bearing (upper)WV WC 6. rrston ring No. 1l * **7. Piston ring No. 2
I)+ 8. Qil ringl * ._ - -’v* Y. Hston oin10. Piston11. Connecting rod
12. Bolt52
ihn38 fklbs.
7EN0266
6EN18!SERVICE POINTS OF REMOVAL
MllT6EC2. REMOVAL OF CONNECTING ROD CAP
Mark the large end of the connecting rod with the cylinder
number for use during reassembly.
6. REMOVAL OF PISTON RING No. 1
/ 7. PISTION RING
No. 2
Remove the piston rings with a piston ring expander.
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ENGINE - Piston and. Connectina RodII-45
LJ
Front mark
-
MD998764
lEN0113
lEN0114
v5EN057
,, Push in by thepiston.
IPiston ringPistonring gap6EN0379. REMOVAL OF PISTON PIN
(1) Insert the special tool,
Pushrod from the front mark side
of the piston top and install the guide B.
(2) With the piston top facing the front mark side of the
special tool, Piston Pin Setting Base and the piston front
mark facing up, set the piston and connecting rod
assembly.
(3) Using a press, remove the piston pin.
NOTEAfter the piston pin is removed, store the piston, piston
pin and connecting rod as grouped for each cylinder
number.
INSPECTION
PISTON RING
MllTCEA
(1) Check the clearance between the piston ring and the ring
groove. When it exceeds the limit, replace the rings, the
piston, or both.
Standard value:
No.10.03 - 0.07 mm (.0012 - .0028 in.)
No.20.02
- 0.06 mm (.OOOS - ‘0024 in.)
Limit: No.10.1 mm (.004 in.)
No.20.1 mm
(.004 in.)(2) Insert the piston ring into the cylinder bore putting it against
the top of the piston head and pressing it in.
When it makes a right angle, measure the piston ring gap
with a feeler gauge. When the gap is too large, replace the
piston ring.
Standard value:
No.10.30-0.45 mm (.0118- .0177 in.)
No.20.45- 0.60 mm (.0177 - .0236 in.)
Oil ring side rail0.20 - 0.60 mmLimit: No.1
(.0079 - .0236 in.)
0.8 mm
(.031 in.)
No.20.8 mm
(.031 in.)
Oil ring side rail1 .O mm (.039 in.)
I
LJ
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11-46ENGINE - Piston and Connecting Rod
7EN246 1
7EN247
MD998765
(Pus:rod)
7EN25;
lENOl17
BEARINGMeasure the inner diameter of the connecting rod bearing and
the outer diameter of the crankshaft pin. If the oil clearance
exceeds the limit, replace the bearing, and crankshaft if
necessary.
Standard value: 0.016
- 0.046 mm (.OOOS - .0018 in.)
Limit: 0.1 mm
(.004 in.)
NOTEFor the method by which the oil clearance is measured using a
plastigauge, refer to the item on the crankshaft.
SERVICE POINTS OF INSTALLATION
MllTDAQ9. INSTALLATION OF PISTON PIN
(1) Insert the special tool, Pushrod into the piston pin and
install the guide A.
(2) Apply engine oil to the outside of the piston pin.
(3) Assemble the piston and connecting rod lining up the
front marks.
(4) Insert the guide A end of the piston pin assembled in
step
(1) into the piston through the pin hole on the front
mark.(5) With the piston top facing the front mark side of the
special tool, Piston Pin Setting Base and the piston front
mark facing up, set the piston.
(6) Using a press, install the piston pin.
If the installation load is smaller than the standard value
range, replace the piston pin (piston assembly) and/or
the connecting rod.
Standard value: 7,500 - 17,500 N (1,686 - 3,934 Ibs.)TSB Revision

ENGINE - Piston and Connecting RodII-47
6EN0223
Side rail
Side rail end
7EN249
7EN250
ldentiftcation mark embossed
No. 1
7Barrel
weldenthcation mark
Tapered
we7EN013i
LI(7) Check that the piston moves smoothly.
8. INSTALLATION OF OIL RING
(1) Fit the oil ring spacer into the piston ring groove.
NOTEOn the side rail and the spacer, no difference exists
between the upper and the lower surfaces.
(2) Attach the side rail on the upper side. When attaching
the side rail, engage one side of the side rail with the
piston groove. If pressed with a finger, as shown in the
illustration, it should enter easily.
NOTEThe side rail may be broken like other piston rings if the
gap is opened by the ring expander.
(3) In the same procedure as Step
(2), position the side rail
on the lower side.
(4) Check that the side rail smoothly rotates in both
directions.
7.INSTALLATION OF PISTON RING No. 2 / 6. PISTON
RING No.1
(1) Using a piston ring expander, position the No.2 and
No.1 piston rings.
Identification mark: No.1
No.2
NOTE
T
T2(1) Keep in mind that Nos.1 and 2 are different in shape.
(2) Assemble the Nos.1 and 2 piston rings with the
manufacturer and size marks stamped on the side
facing upward (toward the piston top).
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11-48ENGINE - Piston and Connecting Rod
Side railNo.1
spacer slotrail
6ENO41
7EN0032
Cylindcnumbe
Stopper notch4. INSTALLATION OF PISTON, CONNECTING ROD~
ASSEMBLY
(1) Liberally coat engine oil on the circumference of the
piston, piston ring, and oil ring.
d
(2) Arrange the piston ring and oil ring gaps (side rail and
spacer) as shown in the illustration.
(3) Rotate crankshaft so that crank pin is on center of
cylinder bore.
(4) Use suitable thread protectors on connecting rod bolts
before inserting piston and connecting rod assembly
into cylinder block. Care must be taken not to nick crank
pin.(5) Using a suitable piston ring compressor tool, install
piston and connecting rod assembly into cylinder block.
Caution
Insert the pistons so that the front marks (arrows)on the piston tops point toward the front of the
engine (timing belt side).
2. INSTALLATION OF CONNECTING ROD CAP
(1) Install the connecting rod, aligning it with the mark
made or the connecting rod cap during disassembly.
When the connecting rod being installed is new and has
no alignment mark, install it so that the notches in the
connecting rod and cap are on the same side, as
illustrated.
‘d(2) Check the connecting rod big end thrust clearance.
Standard value: 0.10
- 0.25 mm (.0039 -‘.0098 in.)
Limit: 0.4 mm
(-016 in.)
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ENGINE - Crankshaft, Flywheel and Drive Plate
CRANKSHAFT, FLYWHEEL AND DRIVE PLATE
II-49
MIIUA- -REMOVAL AND INSTALLATION
L
/
id
75 Nm
155 ft.lbs.
11 Nmb4
8 ft.lbs.
I
9Removal steps
,12
80 Nm
‘58 ft.lbs.48Nm
35 ft.lbs.
7EN0318
1. Flywheel ‘2. Adaptor plate 3. Drive plate QVT>4. Rear plate5. Bell housing cover6. Oil seal case047. Crankshaft rear oil Seal** 8. Bearing cap stay ** 9. Bearing cap*+ IO. Thrust bearing A+* 11. Thrust bearing B*a 12. Crankshaft bearing (lower)
13. Crankshaft
** 14. Thrust bearing B*+ 15. Thrust bearing AI)* 16. Crankshaft bearing (upper)
7EN273
Sealant: 3M ATD Part No. 8660
or equivalent
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II-50ENGINE - Crankshaft, FlYwheel and Drive Plate
\7EN262
7EN261INSPECTION
MllUCHAFLYWHEEL (engine with a manual transaxle)
(I) Make a visual inspection of the clutch disc. If stepped wear, :streaking, or seizure are apparent, replace it.\J(2) If flywheel run out exceeds the limit, replace it.
Limit: 0.13 mm
t.0051 in.)
RING GEAR (engine with a manual transaxle)
When there is wear, cracks, or other damage to the ring gear
teeth, replace the ring gear by the following procedure. Check
the starter motor pinion.
Ring gear replacement procedure:
(1) Tap around the ring gear to loosen and remove it from the
flywheel..
CautionThe ring gear cannot be removed while it is hot.
(2) Heat the ring gear to 300°C (572°F) and install it into the
flywheel.
CRANKSHAFTInspect out-of-roundness and taper of crankshaft journal and
pin.
Limit:Out-of-roundness of journal and pin:
LJ
0.003 mm (.00012 in.)Taper of journal and pin: 0.005 mm
(.00020 in.)
OIL CLEARANCE MEASUREMENT
(I) To check the oil clearance, measure the outside diameter of
the crankshaft journal and the crank pin and the inside
diameter of the bearing. The clearance can be obtained by
calculating the difference between the measured outside
and inside diameters.
Standard value: 0.019
- 0.044 mm i.0007 - .0017 in.)
Limit: 0.1 mm
(.004 in.)
(2) If the oil clearance exceeds the limit, replace the bearing,
and crankshaft if necessary.
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