engine MITSUBISHI 3000GT 1991 Owner's Manual

00-38GENERAL - Maintenance Service
6. DRIVE BELT (For Alternator)
00F0006
:Vehicles with air conditioner>OOFOO07
A: Crankshaft pulleyB: Tension pulleyC: Alternator pulleyD: Idler pulleyE: ,Air conditioner compressor pulley
OlLO183
OlLO18:(Inspect tension)
MOOS88(1(1) Measure the deflection with a force of
100 N (22 Ibs.)applied to belt mid-point between pulleys shown in the
illustration. If the standard value is not obtained, make
adjustment.
Standard value: 4.0
- 5.5 mm (.157 - 216 in.)
(2) On vehicles without air conditioner, set a tension gauge at a
position marked with
r3 in the illustration to measure the
belt tension.
7. ENGINE OIL
(Inspect oil level)
(I) Check to see that the engine oil level is within the range
indicated on the oil level gauge.
(2) Make sure that engine oil is not very dirty or is free from
coolant or gasoline and has an appropriate viscosity grade.J
(Change)
MOOSAAHAlways use lubricants which conform to the requirements of
the API classification “For Service SG” or “For Service
SGKD”when available, and have the proper SAE grade number for the
expected temperature range.
Never use nondetergent or straight mineral oil.
(1) After warming up the engine, remove the oil ‘filler cap.
(2) Remove the drain plug and drain the engine oil.
(3) Tighten the drain plug to 40 Nm (29 ft.lbs.).
(4) Pour new engine oil through the oil filler.
Caution
1.Cover the alternator with waste cloth or the like before
pouring engine oil to make sure that even if oil is spilt,it may not drop on the alternator.
2. Use an oil mug or a funnel to pour oil.
Engine oil total capacity:4.0 liters (4.2 qts.)
[excluding oil filter 0.3 liter (l/2 qt.)
and oil cooler 0.21 liter (l/2 qt.)](5) Check to ensure that the engine oil level is within the level
range indicated on the oil dip stick.
TSB Revision

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

00-42GENERAL - Maintenance Service
14UOO729. Install the radiator cap securely.
10.
Start’the engine and warm up until the thermostat opens.
11. Race the engine up to around 3,000 rpm several times, then
stop the engine.,12. When the enkine has cooled down, remove the radiator cap
L/and add coolant up to the brim. Add coolant to the reserve
tank up to the FULL line.

1. Lift up the vehicle.
2.Loosen the radiator drain plug, remove the drain plug from
the rear bank of the engine and remove the radiator cap to
discharge coolant.
3. Follow the same steps 3 to 12 above.
12.DISC BRAKE PADS (Inspect for wear)MOOSBFDCheck for fluid contamination and wear. Replace complete set
of pads if defective.
Caution
The pads for the right and left wheels should be replaced atIIthe same time. Never “split” or intermix brake pad sets. AllUfour pads must be replaced as a complete set.
Thickness of lining (A):
Limit2.0 mm (.08 in.)
13. BRAKE HOSES (Check for deterioration or
leaks)
MOOSBHBInspection of brake hoses and tubing should be included in all
brake service operations.
The hoses should be checked for:
1.Correct length, severe surface cracking, pulling, scuffing or
worn spots. (If the fabric casing of the hoses is exposed by
cracks or abrasion in the rubber hose cover, the hoses
should be replaced. Eventual deterioration of the hose may
occur with possible bursting failure.)
2. Faulty installation, casing twisting or interference with
wheel, tire or chassis.
14. BALL JOINT AND STEERING LINKAGE SEALS
(Inspect for grease leaks and damage)
MOOSglC1. These components, which are permanently lubricated at
the factory, do not require periodic lubrication. Damaged
seals and boots should be replaced to prevent leakage or
contamination of the grease.
2.Inspect the dust cover and boots for proper sealing, leakageIdand damage. Replace them if defective.
TSB Revision

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

II-2ENGINE - General Information
GENERAL INFORMATIONMllBAEC
SECTIONAL VIEW
I:
7EN0335ii
7EN0334
TSB Revision

ENGINE - General InformationII-3.UBRICATION SYSTEM
7LUOO25
TSB Revision

II-4ENGINE - Specifications
SPECIFICATIONSMllCA--GENERAL SPECIFICATIONS
‘,
‘dItems
Non-Turbo
Turbo
TypeV-type, DOHC
V-type, DOHC
Number of cylinders
6
6
Boremm (in.)
91 .I (3.587)
91 .I (3.587)
Stroke
mm (in.)
76.0 (2.992)
76.0 (2.992)
Piston displacementcc (win.)2,972 (181.4)
2,972 (181.4)
Compression ratio
10.08.0
Firing order
1-2-3-4-5-6
1-2-3-4-5-6
Valve timing
Intake valve
Opens (BTDC)16
16
Closes (ABDC)55”
55”
Exhaust valve
Opens (BBDC)4850”
Closes (ATDC)1517”SERVICE SPECIFICATIONS
MllCE -
Items
Compression pressure
kPa (psi)/rpm
Non-Turbo
Turbo
Compression pressure difference of all
cylinder
kPa (psi)
Manifold vacuum
mmHg (in.Hg.)
Non-Turbo
Turbo
Bas2Tig;ition timing at curb idle speedAct;ir-&yition
timing at curb idle speed
Curb idle speedrpmStandard value
-
-
-
520 (20)
495 (19)
5” f 2”
Approx. 15”700
ZII 100
Limit
min. 980
(139)/250 - 400
min. 810(115)/250-400
max. 100 (14)
d
1 TSB Revision

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