1991 MITSUBISHI MONTERO Service Manual

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Page 33 of 1333

MITSUBISHI MONTERO 1991 Service Manual OIL PRESSURE
Oil pressure should be at least 11.4 psi (.8 kg/cm) at idle
and engine oil temperature of 167-194F (75-90C).
OIL PUMP
Removal
Remove timi

OIL PRESSURE
Oil pressure should be at least 11.4 psi (.8 kg/cm) at idle
and engine oil temperature of 167-194F (75-90C).
OIL PUMP
Removal
Remove timing belt and crankshaft sprocket. See TIMING BELT
under REMOVAL & INSTALLATION. Remove oil pan. See OIL PAN under
REMOVAL & INSTALLATION. Remove oil filter and mounting bracket. Remove
oil pump and gasket from cylinder block. Note bolt length and location
for installation.
Disassembly & Inspection
1) Disassemble pump, and check for scoring and cracks.
Install rotors in pump body. Check clearance between driven rotor and
pump body. See OIL PUMP SPECIFICATIONS table. Place straightedge
across pump body to check rotor side clearance.
2) Check clearance between straightedge and both rotors.
Replace rotor set or pump assembly if not within specification. Ensure
relief valve slides freely in pump body bore. Inspect relief valve
spring for damage.
OIL PUMP SPECIFICATIONS TABLE
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Application In. (mm)
Driven Rotor-To-Pump Body ........ .0039-.0071 (.099-.180)
Rotor Side Clearance ............. .0016-.0037 (.041-.094)
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Reassembly & Installation
1) Reassemble pump. Tighten pump rear cover bolts to
specification. See appropriate TORQUE SPECIFICATIONS table in this
article. Install oil pump and gasket. Ensure splined teeth of oil pump
align with crankshaft. Install bolts, and tighten to specification.
2) If oil seal was removed, coat new seal with grease. Using
Seal Installer (MD998717), install seal in oil pump until flush with
case. Install remaining components.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE (MONTERO & PICKUP)\
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Application Ft. Lbs. (N.m)
Air Intake Plenum Stay Bolts ............... 11-14 (15-19)
Camshaft Bearing Cap Bolt .................. 14-15 (19-20)
Camshaft Sprocket Bolt ..................... 58-72 (79-98)
Connecting Rod Nut ......................... 37-38 (50-52)
Crankshaft Pulley Bolt
Montero .............................. 108-116 (146-157)
Pickup ............................... 130-137 (176-186)
Cylinder Head Bolt ( 1)
Cold Engine .............................. 65-72 (88-98)
Drive Plate Bolt ........................... 53-55 (72-75)
Exhaust Manifold Nut ....................... 11-16 (15-22)
Flywheel Bolt .............................. 53-55 (72-75)
Intake Manifold Bolts ...................... 11-15 (15-20)
Left Engine Support Bracket Bolt ........... 15-21 (20-30)

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MITSUBISHI MONTERO 1991 Service Manual Main Bearing Cap Bolt ...................... 55-61 (75-83)
Oil Pick-Up Tube Bolt ...................... 11-15 (15-20)
Rear Engine Support
Bracket-To-Engine Bolt .................... 13-18 (18-2

Main Bearing Cap Bolt ...................... 55-61 (75-83)
Oil Pick-Up Tube Bolt ...................... 11-15 (15-20)
Rear Engine Support
Bracket-To-Engine Bolt .................... 13-18 (18-25)
Relief Valve Plug .......................... 29-36 (39-49)
Right Engine Support Bracket Bolt
10x22 mm ................................. 25-36 (34-49)
12x22 mm & 12x32 mm ...................... 47-61 (64-83)
Rocker Shaft ............................... 14-15 (19-20)
Timing Belt Tensioner Bolt ................. 16-21 (22-29)
Water Pump Bolt ............................ 14-20 (19-27)
INCH Lbs. (N.m)
Delivery Pipe Bolt ......................... 84-108 (9-12)
Distributor Adapter Bolt .................. 108-132 (12-15)
Oil Filter Bracket Bolt .................. 108-120 (12-14)
Oil Pan Bolt ................................. 48-60 (5-7)
Oil Pump Cover Bolt ........................ 72-108 (8-12)
Oil Pump Mounting Bolt ................... 108-120 (12-14)
Rear Seal Case Bolt ........................ 84-108 (9-12)
Rocker Cover Bolt ............................ 72-84 (8-9)
Throttle Body Bolt ......................... 84-108 (9-12)
Timing Belt Cover Bolt ..................... 84-108 (9-12)
Transmission Mounting Plate Bolt ........... 84-108 (9-12)
( 1) - Tighten in 2 steps using proper sequence.
See Fig. 4.
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TORQUE SPECIFICATIONS TABLE (3000GT)\
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Application Ft. Lbs. (N.m)
Air Intake Plenum Stay Bolts ..................... 13 (18)
Automatic Tensioner Bolt ......................... 17 (23)
Camshaft Bearing Cap Bolt ........................ 15 (20)
Camshaft Sprocket Bolt ........................... 65 (88)
Connecting Rod Nut ............................... 38 (52)
Crankshaft Pulley Bolt
SOHC ................................. 108-116 (146-157)
DOHC ................................. 130-137 (176-186)
Cylinder Head Bolt ( 1)
SOHC ................................... 76-83 (103-113)
DOHC
Non-Turbo ............................. 76-83 (103-113)
Turbo ................................. 87-94 (118-127)
Distributor Adapter Bolt ......................... 11 (15)
Drive Plate Bolt ................................. 55 (75)
Engine Support Bracket Bolt
Except 10x40 mm ........................ 76-83 (103-113)
10x40 mm ................................. 47-54 (63-73)
Exhaust Manifold Nut ............................. 13 (18)
Flywheel Bolt .................................... 55 (75)
Intake Manifold Bolt
Lower Manifold
Non-Turbo ............................... 11-15 (15-20)
Turbo .................................... 9-11 (12-15)
Upper Manifold ................................. 13 (18)
Main Bearing Cap Bolt ............................ 58 (79)
Oil Filter Bracket Bolt .......................... 11 (15)
Oil Pick-Up Tube Bolt ............................ 14 (19)
Oil Pump Mounting Bolt ........................... 11 (15)

Page 35 of 1333

MITSUBISHI MONTERO 1991 Service Manual Rear Engine Support
Bracket-To-Engine Bolt .................... 13-18 (18-25)
Relief Valve Plug ................................ 33 (45)
Rocker Shaft ............................... 14-15 (19-2

Rear Engine Support
Bracket-To-Engine Bolt .................... 13-18 (18-25)
Relief Valve Plug ................................ 33 (45)
Rocker Shaft ............................... 14-15 (19-20)
Roll Stopper Bracket Through Bolts ......... 36-43 (49-58)
Turbocharger-To-Exhaust Fitting ............ 40-47 (54-64)
Timing Belt Tensioner Bolt ....................... 31 (42)
Water Pump Bolt .................................. 17 (23)
INCH Lbs. (N.m)
Delivery Pipe Bolt .............................. 108 (12)
Oil Pan Bolt ................................. 48-60 (5-7)
Oil Pump Cover Bolt .............................. 96 (11)
Rear Seal Case Bolt .............................. 96 (11)
Rocker Cover Bolt
SOHC ....................................... 72-84 (8-9)
DOHC ............................................ 26 (3)
Throttle Body Bolt ......................... 84-108 (9-12)
Timing Belt Cover Bolt ..................... 84-108 (9-12)
Transmission Mounting Plate Bolt ........... 84-108 (9-12)
( 1) - Tighten in 2 steps using proper sequence.
See Fig. 4.
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ENGINE SPECIFICATIONS
GENERAL ENGINE SPECIFICATIONS
GENERAL SPECIFICATIONS TABLE\
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Application Specification
3.0L V6 DOHC Non-Turbo
Displacement ....................... 181.4 Cu. In. (3.0L)
Bore ................................... 3.587" (91.1 mm)
Stroke ................................. 2.992" (76.0 mm)
Compression Ratio ................................ 10.0:1
Fuel System ......................................... PFI
Horsepower @ RPM ............................. 222 @ 6000
Torque Ft. Lbs. @ RPM ........................ 201 @ 4500
3.0L V6 DOHC Turbo
Displacement ....................... 181.4 Cu. In. (3.0L)
Bore ................................... 3.587" (91.1 mm)
Stroke ................................. 2.992" (76.0 mm)
Compression Ratio ................................. 8.0:1
Fuel System ......................................... PFI
Horsepower @ RPM ............................. 300 @ 6000
Torque Ft. Lbs. @ RPM ........................ 307 @ 2500
3.0L V6 SOHC
Displacement ....................... 181.4 Cu. In. (3.0L)
Bore ................................... 3.587" (91.1 mm)
Stroke ................................. 2.992" (76.0 mm)
Compression Ratio ................................. 8.9:1
Fuel System ......................................... PFI
Horsepower @ RPM ............................. 143 @ 5000
Torque Ft. Lbs. @ RPM ........................ 168 @ 2500
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Page 36 of 1333

$MITSUBISHI MONTERO 1991 Service Manual CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS SPECIFICATIONS CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS TABLE ��\ ��\ ��\ ��$

CRANKSHAFT, MAIN & CONNECTING
ROD BEARINGS SPECIFICATIONS
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS TABLE
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Application In. (mm)
Crankshaft
End Play
Standard ...................... .0020-.0098 (.050-.250)
Limit ...................................... .012 (.30)
Main Bearings
Journal Diameter ........................... 2.36 (59.9)
Journal Out-Of-Round
SOHC ..................................... .0002 (.005)
DOHC .................................... .00012 (.003)
Journal Taper ............................. .0002 (.005)
Oil Clearance
Standard
SOHC ........................ .0008-.0019 (.020-.048)
DOHC ........................ .0007-.0017 (.018-.043)
Limit ...................................... .004 (.10)
Connecting Rod Bearings
Journal Diameter ......................... 1.965 (49.91)
Journal Out-Of-Round
SOHC ..................................... .0002 (.005)
DOHC .................................... .00012 (.003)
Journal Taper ............................. .0002 (.005)
Oil Clearance
Standard ...................... .0006-.0018 (.015-.046)
Limit ...................................... .004 (.10)
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CONNECTING RODS SPECIFICATIONS
CONNECTING RODS TABLE\
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Application In. (mm)
Maximum Bend .................................. .002 (.05)
Maximum Twist (Total Rod Length) .............. .004 (.10)
Side Play
Standard ....................... .0039-.0099 (.099-.251)
Limit ....................................... .016 (.41)
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PISTONS, PINS & RINGS SPECIFICATIONS (SOHC)
PISTONS, PINS & RINGS TABLE (SOHC)\
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Application In. (mm)
Pistons
Clearance ...................... .0008-.0016 (.020-.040)
Diameter ................................. 3.587 (91.11)
Pins
Piston Fit ......................................... ( 1)
Rod Fit ............................................ ( 2)
Rings
No. 1
End Gap
Standard .................... .0118-.0177 (.300-.450)
Limit .................................... .031 (.79)

Page 37 of 1333

MITSUBISHI MONTERO 1991 Service Manual Side Clearance
Standard .................... .0020-.0035 (.051-.089)
Limit .................................... .004 (.10)
No. 2
End Gap
Standard .................... .009

Side Clearance
Standard .................... .0020-.0035 (.051-.089)
Limit .................................... .004 (.10)
No. 2
End Gap
Standard .................... .0098-.0157 (.249-.399)
Limit .................................... .031 (.79)
Side Clearance
Standard .................... .0008-.0024 (.020-.060)
Limit .................................... .004 (.10)
No. 3 (Oil)
End Gap
Standard ........................ .008-.024 (.20-.60)
Limit .................................... .039 (.99)
(1) - Slip.
( 2) - At press load of 1686-3934 lbs. (7500-17500 N).
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PISTONS, PINS & RINGS SPECIFICATIONS (DOHC)
PISTONS, PINS & RINGS TABLE (DOHC)\
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Application In. (mm)
Pistons
Clearance ...................... .0012-.0020 (.030-.051)
Diameter ................................. 3.587 (91.11)
Pins
Piston Fit ......................................... ( 1)
Rod Fit ............................................ ( 2)
Rings
No. 1
End Gap ....................... .0118-.0177 (.300-.450)
Side Clearance
Standard .................... .0012-.0028 (.030-.071)
Limit .................................... .004 (.10)
No. 2
End Gap ....................... .0177-.0236 (.450-.599)
Side Clearance
Standard .................... .0008-.0024 (.020-.060)
Limit .................................... .004 (.10)
No. 3 (Oil)
End Gap
Standard ........................ .008-.024 (.20-.60)
Limit .................................... .039 (.99)
( 1) - Slip.
( 2) - At press load of 1686-3934 lbs. (7500-17500 N).
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CYLINDER BLOCK SPECIFICATIONS
CYLINDER BLOCK TABLE\
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Application In. (mm)
Cylinder Bore
Standard Diameter ......................... 3.586 (91.10)
Maximum Taper & Out-Of-Round ............... .0008 (.020)
Maximum Deck Warpage
Standard ..................................... .002 (.05)
Limit ...................................... .0039 (.099)

Page 38 of 1333

$MITSUBISHI MONTERO 1991 Service Manual ��\ ��\ ��\ ��\ ��\ ��\ �� VALVES & VALVE SPRINGS SPECIFICATIONS (SOHC) VALVES & VAL$

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VALVES & VALVE SPRINGS SPECIFICATIONS (SOHC)
VALVES & VALVE SPRINGS TABLE (SOHC)\
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Application Specification
Intake Valves
Face Angle ..................................... 45-45.5

Minimum Margin ........................... .028" (.71 mm)
Standard Length ...................... 4.055" (103.00 mm)
Stem Diameter ............. .3134-.3140" (7.960-7.976 mm)
Exhaust Valves
Face Angle ..................................... 45-45.5

Minimum Margin .......................... .059" (1.50 mm)
Standard Length ...................... 4.043" (102.70 mm)
Stem Diameter ............. .3122-.3130" (7.930-7.950 mm)
Valve Springs
Free Length
Standard ............................. 1.988" (50.50 mm)
Limit ................................ 1.949" (49.50 mm)
Installed Height ...................... 1.591" (40.41 mm)
Out-Of-Square
Standard ............................................ 2

Limit ............................................... 4
Lbs. @ In. (kg @ mm)
Pressure
Valve Closed ..................... [email protected] ([email protected])
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VALVES & VALVE SPRINGS SPECIFICATIONS (DOHC)
VALVES & VALVE SPRINGS TABLE (DOHC)\
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Application Specification
Intake Valves
Face Angle ..................................... 45-45.5

Minimum Margin ........................... .019" (.48 mm)
Standard Length ...................... 4.185" (106.30 mm)
Stem Diameter ........................... .260" (6.60 mm)
Exhaust Valves
Face Angle ..................................... 45-45.5

Minimum Margin ........................... .039" (.99 mm)
Standard Length ...................... 4.150" (105.41 mm)
Stem Diameter ........................... .260" (6.60 mm)
Valve Springs
Free Length
Standard ............................. 1.846" (46.89 mm)
Limit ................................ 1.807" (45.90 mm)
Installed Height ...................... 1.492" (37.90 mm)
Out-Of-Square
Standard ............................................ 2

Limit ............................................... 4
Lbs. @ In. (kg @ mm)
Pressure
Valve Closed ..................... [email protected] ([email protected])
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Page 39 of 1333

$MITSUBISHI MONTERO 1991 Service Manual CYLINDER HEAD SPECIFICATIONS (SOHC) CYLINDER HEAD TABLE (SOHC)��\ ��\ ��\ ��\ ��\ ��\ ��$

CYLINDER HEAD SPECIFICATIONS (SOHC)
CYLINDER HEAD TABLE (SOHC)\
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Application Specification
Cylinder Head Height ................... 3.307" (84.00 mm)
Maximum Warpage ........................... .008" (.20 mm)
Valve Seats (Intake & Exhaust)
Seat Angle ......................................... 45

Seat Width .................... .035-.051" (.90-1.30 mm)
Seat Bore Diameter ....... 1.732-1.742" (44.00-44.25 mm)
Valve Guides
Intake Valve
Valve Guide Cylinder Head
Bore I.D. ............. .5118-.5189" (13.00-13.18 mm)
Valve Guide Length ..................... 1.732" (44 mm)
Stem-To-Guide Clearance
Standard ................ .0012-.0024" (.030-.060 mm)
Limit ................................ .004" (.10 mm)
Exhaust Valve
Valve Guide Cylinder Head
Bore I.D. ............. .5118-.5189" (13.00-13.18 mm)
Valve Guide Length ..................... 1.890" (48 mm)
Stem-To-Guide Clearance
Standard ................ .0020-.0035" (.050-.090 mm)
Limit ................................ .006" (.15 mm)
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CYLINDER HEAD SPECIFICATIONS (DOHC)
CYLINDER HEAD TABLE (DOHC)\
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Application Specification
Cylinder Head Height .................... 5.20" (132.1 mm)
Maximum Warpage ........................... .008" (.20 mm)
Valve Seats (Intake & Exhaust)
Seat Angle ......................................... 45

Seat Width .................... .035-.051" (.90-1.30 mm)
Seat Bore Diameter ....... 1.417-1.427" (35.99-36.25 mm)
Valve Guides
Intake Valve
Valve Guide Cylinder Head
Bore I.D. ............. .5118-.5189" (13.00-13.18 mm)
Valve Guide
Installed Height ................... .689" (17.50 mm)
Stem-To-Guide Clearance
Standard ................ .0008-.0020" (.020-.051 mm)
Limit .............................. .0039" (.099 mm)
Exhaust Valve
Valve Guide Cylinder Head
Bore I.D. ............. .5118-.5189" (13.00-13.18 mm)
Valve Guide
Installed Height ................... .689" (17.50 mm)
Valve Stem-To-Guide
Clearance
Standard ............... .0020-.0035" (.051-.089 mm)
Limit ............................. .0047" (.119 mm)
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CAMSHAFT SPECIFICATIONS (SOHC)

Page 40 of 1333

$MITSUBISHI MONTERO 1991 Service Manual CAMSHAFT TABLE (SOHC)��\ ��\ ��\ ��\ ��\ ��\ �� Application$

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