1991 MITSUBISHI 3000GT engine oil

GENERAL - Maintenance Service00-39ogPOO268. ENGINE OIL FILTER (Change)
MOOEAEJThe quality of replacement filters varies considerably. Only high
quality filters should be used to assure most efficient service.
Genuine oil filters require that the filter be capable of
withstanding a pressure of 256 psi are high quality filters and
are recommended as follows:
Oil Filter Part No.
MITSUBISHI Genuine Parts: MD136790
ENGINE OIL FILTER SELECTIONThis vehicle is equipped with a full-flow, throw-away oil filter.
The same type of replacement filter is recommended as a
replacement filter for this vehicle. It is possible, particularly in
cold weather, that this vehicle may develop high oil pressure
for a short duration. You should be sure that any replacement
filter used on this vehicle is a high-quality filter and is capable of
withstanding a pressure of 256 psi (1,765
kpa) (manufacturer’s
specifications) to avoid filter and engine damage. The following
is a highquality filter and is strongly recommended for use on
this vehicle: Mitsubishi Engine Oil Filter P/N MD136790.
Any replacement oil filter should be installed in accordance with
the oil filter manufacturer’s installation instructions.
(1) Remove the engine oil filter by using the oil filter wrench.
(2) Clean the oil filter mounting surface of the oil filter bracket.
(3) Coat engine oil to the O-ring of new oil filter.
(4) Turn the oil filter by hand and install to the filter bracket.
NOTEThe oil filter tightening torque is 14 Nm (11
ft.lbs.1.(5) Start and run engine and check for engine oil leaks.
(6) After stopping engine, check oil level and refill as neces-
sary.
9. MANUAL TRANSAXLE (Inspect oil level)
MOOSBCGInspect each component for evidence of leakage, and check
the oil level by remaining the filler plug. If the oil is contami-
nated, it is necessary to replace it with new oil.
(1) With the vehicle parked at a level place, remove the filler
plug.
-Revision

GENERAL - Maintenance Service00-41
Good
t-lVA0283
I04FOOOd(4) Check the oil filter for clogging and damage and replace if
necessary.
(5) Clean drain plug and tighten drain plug with gasket to 30
-35 Nm (22
- 25 ft.lbs.).
(6) Clean both gasket surfaces of transaxle case and oil pan.
(7) Install oil pan with new gasket and tighten oil pan bolts to
10 - 12 Nm (7.5 - 8.5 ft.lbs.).
(8) Pour 4.5 liters (4.8 qts.) of specified ATF into case through
dipstick hole. [Total quantity of ATF required is approx. 7.5
liters (7.9 qts.). Actually however, approx. 4.5 liters (4.8 qts.)
of fluid can be replaced because rest of fluid remains in
torque converter.]
Specified fluid: Dia ATF SP or MITSUBISHI PLUS ATF or
equivalent(9) Start engine and allow to idle for at least two minutes.
Then, with parking brake on, move selector lever momen-
tarily to each position, ending in “N” Neutral position.
(lO)Add sufficient ATF to bring fluid level to lower mark.
Recheck fluid level after transaxle is at normal operating
temperature. Fluid level should be between upper and
lower marks of “HOT” range. Insert dipstick fully to prevent
dirt from entering transaxle.
11. ENGINE COOLANT (Change)
MOOSBEHCheck the cooling system parts, such as radiator, heater, and
oil cooler hoses, thermostat and connections for leakage and
damage.
CHANGING COOLANT
1.
2.
3.
4.
5.
6.
7.
8.Remove te heat protectors (front and rear) from the exhaust
manifold.
Loosen the radiator drain plug, remove two drain plugs from
the engine block (one for each bank) and remove the
radiator cap to discharge coolant.
Remove the reservoir tank and discharge coolant.
When coolant has been discharged, pour water through the
filler port to flush coolant passage.
Coat the threads of the engine drain plugs with the
specified sealant and tighten the plugs to specification.
Specified sealant: 3M Nut Locking Part No. 4171 or
equivalentTightening torque: 40 Nm (29
ftlbs.)Fit the radiator drain plug securely.
Mount the reserve tank.
Slowly pour coolant into the radiator to the brim and also
into the reserve tank up to the FULL line.
1 TSB RevisionI

00-44
GENERAL - Main Sealant and Adhesive Table
MAIN SEALANT AND ADHESIVE TABLEMWZA- -
ApplicationRecommendedbrand
1. Sealants for engine accessories
(I 1Sealing between rocker
3M ATDcover and camshaft
Part No. 8660
bearing cap
(4G6 DOHC and 6G7or equivalent
engines only)
(2) l Sealing between semi-3M ATD
circular packing and
Part No. 8660
rocker cover and between
semi-circular packing andor equivalent
cylinder head
l Oil pressure switch
(except 4Gl and 6G7engines)
(3) Engine coolanttemperature switch,Engine coolanttemperature sensor,Therm0 valve,Therm0 switch, Joints,Engine coolanttemperature gauge unit(large size)
3M Nut LockingPart No. 4171
or equivalent
(4) Engine coolanttemperature gauge unit(;.s;il size, MD091 0563M ATDPart No. 8660
or equivalent
(5) Oil pan(except 4G5 engine)MITSUBISHI
GENUINE Part No.
MD9971 10or equivalent
2. Sealing between glass and
weatherstrip
(I 1 l Sealing between
tempered glass and
weatherstrip
l Sealing between body
flange and weatherstrip3M ATD
Part No. 8513or equivalent
3M ATD
Part No. 8509or equivalent
(2) Sealing betweenlaminated glass andweatherstrip
3. Adhesion with ribbon sealer
l Waterproof film for doorl Fender panell Splash shieldl Mudguardl Rear combination lamp
3M ATDPart No. 8509
or equivalent
3M ATDPart No. 8625or equivalent
ApplicationRecommended
brand
4. Adhesives for interior trim
(1)Adhesion of polyvinyl-chloride sheet3M Part No.EC-l 368or equivalent
(2)Adhesion of door
3M ATD
weatherstrip to body
Part No. 8001 or3M ATDPart No. 8011or equivalent
(3) Sealing betweengrommet or packing and
metal seal
(4) l Adhesion of headliningand other interior trimmaterialsl Adhesion of fuel tank
to pad
3M ATDPart No.851 3or equivalent3M
Part-No.
EC-l 368
or 3M ATD Part No.
8080 or equivalent
5. Body sealant3M ATDl Sealing of sheet metal,
Part No. 8531 or
drip rail, floor, body side3M ATDpanel, trunk, front panel and
Part No.8646the like jointsl Sealing of tailgate hingesor equivalent
6. Chassis sealant
(I 1 l Sealing of flange surfaces3M ATD
and threaded portions
Part No. 8659l Fuel gauge unit packingor equivalent
(2)Sealing of flange surfaces,3M ATD
threaded portions, packingPart No.8663
and dust cover
l Differential carrier packingor equivalent
l Dust covers for ball jointand linkage
l Steering gear box packing
and shims
l Steering gear housingrack support cover andtop coverl Mating surface of knucklearm flange
(3)Sealing between accelerator
arm bracket and toeboardDrying sealant
(4)Sealant for drum brakeshoe hold-down pin andwheel cylinder3M ATDPart No.851 3or equivalent
TSB Revision1

11-I
ENGINECONTENTS
IMllAA--
CAMSHAFT OIL SEALS....................................
CRANKSHAFT, FLYWHEEL AND
DRIVEPLATE........................................................
CYLINDER BLOCK................................................
CYLINDER HEAD AND VALVE........................
CYLINDER HEAD GASKET................................
ENGINE ASSEMBLY............................................
ENGINE OIL COOLER........................................
GENERAL INFORMATION................................
lbLubricationSystem............................................SectionalView
....................................................
OIL PAN AND OIL PUMP....................................
OIL PAN AND OIL SCREEN................................20
49
5334
23
17
552
3
240
22
PISTON AND CONNECTING ROD....................
ROCKER ARM AND CAMSHAFT....................
SERVICE ADJUSTMENT PROCEDURES........Compression Pressure Check
........................Curb Idle Speed Inspection
............................Drive Belts Tension Adjustment
....................Ignition Timing Adjustment
............................
LashAdjusters
Check........................................Manifold Vacuum
Inspection
.............................
SPECIAL TOOLS....................................................
SPECIFICATIONS................................................General Specifications
....................................
Sealants
.......................................
.....................Service Specifications
....................................
TIMING BELT........................................................
TROUBLESHOOTING........................................44
31
11
15
14
11
13
16
16
84
4
84
26
10

L’
LENGINE
- Specifications11-5
Items
Standard value
Limit
Cylinder head
Overall height
mm (in.)
132 (5.20)-0.2 (-,008)’
Flatness of gasket surface
mm (in.)Max. 0.03 l.0012)0.2 (.008)
Oversize rework dimension of valveseat hole
mm (in.)
Intake
0.3 f.012) O.S.36.300 - 36.325 (1.4291 - 1.4301)
0.6 l.024) O.S.36.600 - 36.625 (1.4409 - 1.4419)
Exhaust 0.3
l.012) O.S.33.300 - 33.325 (1.31 IO - 1.3120)
0.6 (.024) O.S.33.600 - 33.625 (1.3228 - 1.3238)
Oversize rework dimension of valveseat hole depth
mm (in.)
Intake
0.3 l.012) O.S.7.5 - 7.7 (.295 - ,303)
0.6 t.024) O.S.
7.8 - 8.0 (.307 - ,315)
Exhaust 0.3 t.012) O.S.7.9-8.1 (.311 - ,319)
0.6 (.024) O.S.
8.2 - 8.4 (.323 - .331)
Oversize rework of valve guide hole
(both intake and exhaust)mm (in.)
0.05 f.002) 0,s.13.050- 13.068(.5138-.5145)
0.25 (.OlO) O.S.13.250- 13.268 (.5217- .5224)
0.50 (.020) 0,s.13.500 - 13.518 (.5315 - .5322)
Samshaft
Cam heightmm (in.)
Intake
35.49 (I .3972)34.99 (1.3776)
Exhaust
35.20 (1.3858)
34.70 (1.3661)
Journal O.D.
mm (in.)
26 (1.02)
Bearing oil clearance
mm (in.)0.05 - 0.09 f.0020 - .0035)
Jalve
Valve lengthmm (in.)
Intake
106.3 (4.185)
Exhaust
105.4 (4.150)
Stem O.D.mm (in.)
Intake
6.6 (.260)
Exhaust6.6 i.260)
Face angle
45 - 45.5”Thick;;ss,yf
valve head (Margin)
Intake
1 .o (.039)0.5 (.019)
Exhaust1.5 (.059)1 .o (.039)
Clearance (Valve stem to guide)
mm (in.)
Intake
0.02 - 0.05 (.0008 - .0020)0.10 l.0039)
Exhaust0.05 - 0.09 l.0020 - .0035)0.12 i.0047)
* Limit must be -0.2 mm (--.008 in.) combined with amount of grinding of cylinder block gasket surface.
TSB Revision

11-6ENGINE - Specifications
Items
Valve guide
Lengthmm (in.)
Intake
Exhaust
Service sizemm (in.)Standard value
45.5 (1.791)
50.5 (1.988)
0.05 f.002). 0.25 (.OlO),0.50 f.020) OversizeLimit
Valve seat
Width of seat contactmm (in.)0.9 - 1.3 (.035 - ,051)
Seat angle44 - 44.5”
Valve spring
Free lengthmm (in.)46.9 (1.846)45.9 (1.807)
LoadN (Ibs.)280 (62) at installed height
Installed heightmm (in.)37.9 (1.492)38.9 (1.531)
Squareness1
Less than 2”4”
Cylinder block
Cylinder boremm (in.)
91 .I0
(3.5866)
Out-of-roundness and taper of cylinderLess than 0.02 i.0008)
boremm (in.)
Flatness of gasket surfacemm (in.)
Less than 0.05 t.0020)0.10 (.0039)
Piston0.D mm (in.)
91 .I0 (3.5866)
Clearance (Piston to cylinder)mm (in.)
0.03 - 0.05 (.0012 - .0020)
Ring groove widthmm (in.)
No. 11.2 (.047)
No. 21.5 f.059)
Oil
3.0 (.I 18)
Service sizemm (in.)
0.25 LO1 0),0.50 (.020),0.75 (.030), 1 .oo l.039)Oversize
Piston ring
Side clearancemm (in.)
No. 1
No. 2
End gap
mm (in.)
No. 1
No. 2
Oil ring side railmm (in.)
Service sizemm (in.)
0.03 - 0.07 (.0012 - .0028)
0.02 - 0.06 l.0008 - .0024)
0.30 - 0.45 (.0118 - .0177)
0.45 - 0.60 (.0177 - .0236)
0.20 - 0.60 (.0079 - .0236)
0.25 (.OlO), 0.50 (.020),0.75 (.030), 1 .oo (.039)Oversize
0.1 (.004)
0.1 (.004)
0.8 i.031)
0.8 l.031)
1 .o (.039)
Connecting rod
Bendmm (in.)
Twist
mm (in.)
Big end to thrust clearancemm (in.)
Piston pin press-in load
N (Ibs.)
0.05 i.0020) or less
0.1 (0.004) or less
0.10 - 0.25 (.0039 - .0098)
7,500 - 17,500 (1,686 - 3,934)
0.4 l.016)
1 TSB Revision

ENGINE - Specifications
/
L
L/
Items
Connecting rod bearing
Oil clearancemm (in.)
Crankshaft main bearing
Oil clearancemm (in.)
Crankshaft
Pin O.D.
mm (in.)
Journal O.D.mm (in.)
Out-of-roundness of journal and pin
mm (in.)
Taper of journal and pin
mm (in.)
End playmm (in.)
Oil pressure at curb idle speed
kPa (psi)
[Conditions: oil temperature is 75 to 90°C
(167 to
194”F)l
Standard value
0.016- 0.046 (.0006- .0018)
0.019 - 0.044 (.0007 - .0017)
49.9 (I ,965)
59.9 (2.358)
Less than 0.003 (.00012)
Less than 0.005 (0002)
0.05 - 0.25 (0020 - .0098)
80 (I 1.4) or more
Limit
0.1
(.004)
0.1 (.004)
0.3 (.012)
Oil pump
Side clearancemm (in.)
Body clearance0.100-0.181 (.0039-.0071)
Side clearance0.040 - 0.095 (.0016 - .0037)
Relief spring
Free lengthmm (in.)43.8 (1.724)
Load
137 N (8.3 Ibs.)]mm (in.)40.1 (1.579)
Drive belt
For alternator (Vehicle without air
conditioner)
Deflectionmm (in.)
Inspection
4.0-5.5(.157-,216)
New belt3.5-4.0(.138-,157)
Used belt4.0-5.0 (.157- ,197)
TensionN (Ibs.)
Inspection350 - 600 (77 - 132)
New belt650
- 850 (143 - 187)
Used belt450
- 600 (99 - 132)
For alternator and air conditioner
compressor
Deflectionmm (in.)
Inspection
4.0-5.5(.157-,216)
New belt3.5-4.0 (1388.157)
Used belt4.0-5.0(.157-,197)
For power steering pump
Deflection
mm (in.)9.0
- 11 .o (354 - ,433)
Timing belt
Amount of projection of auto tensioner3.8-4.5(.149-,177)rodmm (in.)(distance between the tensioner arm andauto tensioner body)
1 TSB Revision

11-8ENGINE - Specifications / Special Tools
SEALANTS
MIKE- -
Items
Oil pan
Oil seal case
Oil pressure switch
Specified sealant
MITSUBISHI GENUINE Part No. MD9971
10 or equivalent
Oil pressure gauge unit
Rocker cover3M ATD Part No.8660 or equivalent
SPECIAL TOOLSMIlDA--
MD998051-01
Loosening and tightening of cylinder head bol
seal installer
compressor
Camshaft oilsealInstallation of camshaft oil seal
1 TSB Revision