throttle body MITSUBISHI MONTERO 1991 Service Manual
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1991, Model line: MONTERO, Model: MITSUBISHI MONTERO 1991Pages: 1333, PDF Size: 24.61 MB
Page 3 of 1333

cable. Label and disconnect all vacuum hoses from throttle body and
upper intake manifold.
2) Disconnect O2 sensor connector. Remove EGR pipe and
gasket. Remove ignition coil. Remove engine oil filler neck bracket.
Remove throttle body, leaving coolant hoses connected. Remove throttle
body gasket. Remove upper intake manifold plenum mounting bolts and
nuts.
3) If necessary, remove EGR valve and pipe. Remove upper
intake manifold plenum brackets. Remove upper intake manifold and
gasket.
Inspection & Installation (Montero & Pickup)
Clean all gasket mating surfaces. Inspect for damage and
cracks on all mounting surfaces. To install, reverse removal procedure
using new gaskets. Tighten bolts and nuts to specification. See TORQUE
SPECIFICATIONS (MONTERO & PICKUP) table at end of article.
Fig. 1: Exploded View of Upper Intake Manifold & Components (DOHC)
Courtesy of Mitsubishi Motor Sales of America, Inc
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Fig. 2: View of Upper Intake Manifold & Components (DOHC Turbo, SOHC)\
Courtesy of Mitsubishi Motor Sales of America, Inc
Removal (3000GT)
1) Remove air intake hose. Remove throttle body and gasket
with control cables and coolant and vacuum hoses attached. See Fig. 2.
2) Remove EGR and EGR pipe (if equipped). Disconnect power
brake hose. Label and disconnect vacuum hoses and electrical
connections. Remove upper intake manifold plenum retaining bracket(s),\
mounting bolts and nuts. Remove upper intake manifold.
Inspection & Installation (3000 GT)
Clean all gasket mating surfaces. Inspect for damage and
cracks on all mounting surfaces. To install, reverse removal procedure
using new gaskets. Install throttle body gasket with projection on
gasket facing upward beyond throttle body mounting surface. Tighten
bolts and nuts to specification. See TORQUE SPECIFICATIONS (3000GT)
table at end of article.
LOWER INTAKE MANIFOLD
CAUTION: Fuel system is under pressure. Fuel pressure must be
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install, reverse removal procedure using new gaskets and "O" rings.
Coat "O" ring with fuel before installation.
2) Install lower intake manifold gasket with adhesive side
toward intake manifold and gasket protrusions facing outboard of
engine. Tighten bolts and nuts to specification. See appropriate
TORQUE SPECIFICATIONS table at end of article. Check for fuel leaks.
TURBOCHARGER
Removal (Front)
1) Drain coolant, and remove radiator. Disconnect exhaust
pipe from turbo. Remove all air intake pipes. Note match marks and
installation depth on air pipes and hoses for reinstallation. Remove
serpentine drive belt. Remove alternator. Remove A/C compressor and
bracket, and support aside.
2) Remove O2 sensor. Remove dipstick assembly and turbo heat
shield. Disconnect turbo coolant feed and return lines. Disconnect
turbo oil feed and return lines. Remove turbocharger assembly.
Removal (Rear)
1) Drain coolant. Remove battery. Disconnect accelerator
cable at bracket and throttle body. Disconnect exhaust pipe from
turbo. Remove all air intake pipes and heat shields. Disconnect
accelerator cable at pedal.
2) Remove clutch booster vacuum hose. Remove O2 sensor.
Remove EGR pipe and turbo heat shield. Disconnect turbo coolant feed
and return lines. Disconnect turbo oil feed and return lines. Remove
turbocharger assembly.
CAUTION: DO NOT allow foreign material into turbocharger air intakes
or coolant and oil passages.
Inspection (Front & Rear)
1) Inspect turbocharger for oil leakage. Check turbine and
compressor wheels for cracks and other damage. Both wheels should turn
easily by hand.
2) Apply 6.8 psi (61 kPa) vacuum to wastegate diaphragm.
Ensure wastegate operates and diaphragm holds vacuum pressure. Use
care when cleaning gasket surfaces so no foreign material enters
turbocharger oil, coolant and air passages.
Installation (Front & Rear)
Refill turbocharger with clean engine oil through oil pipe
installation hole. To complete installation, reverse removal
procedure. Align match marks, and install air pipes and hoses to
proper depth.
EXHAUST MANIFOLDS
Removal (Montero & Pickup)
1) Remove splash shields. Remove O2 sensor. Remove exhaust
pipe-to-manifold nuts. Lower exhaust pipe, and remove gasket. Remove
heat protector. To remove right exhaust manifold, remove air duct,
engine lift bracket and alternator bracket.
2) To remove left exhaust manifold, remove EGR pipe and
gasket. Remove front intake manifold plenum bracket. Remove exhaust
manifolds and gaskets.
Inspection (Montero & Pickup)
Clean all gasket mating surfaces. Inspect for damage and
cracks on all mounting surfaces. Check mounting surfaces of manifold
and cylinder head for warpage. Repair or replace components if warpage
exceeds .012" (.30 mm).
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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)
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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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