Mitsubishi Montero (2004+). Manual — part 99
11A-1
GROUP 11A
ENGINE
MECHANICAL
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
ENGINE DIAGNOSIS. . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
DRIVE BELT TENSION CHECK. . . . . . . . .
AUTO-TENSIONER CHECK . . . . . . . . . . .
IGNITION TIMING CHECK . . . . . . . . . . . . .
CURB IDLE SPEED CHECK . . . . . . . . . . .
IDLE MIXTURE CHECK . . . . . . . . . . . . . . .
COMPRESSION PRESSURE CHECK. . . .
MANIFOLD VACUUM CHECK . . . . . . . . . .
LASH ADJUSTER CHECK . . . . . . . . . . . . .
ENGINE ASSEMBLY . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
CAMSHAFT AND VALVE STEM
SEAL . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
CAMSHAFT OIL SEAL . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
OIL PAN AND OIL SCREEN . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
CRANKSHAFT OIL SEAL . . . . . . . . .
REMOVAL AND INSTALLATION
<FRONT OIL SEAL> . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION
<REAR OIL SEAL> . . . . . . . . . . . . . . . . . . .
CYLINDER HEAD GASKET . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
TIMING BELT . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
LUBRICANT . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION
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ENGINE MECHANICAL
11A-2
GENERAL DESCRIPTION
M1111000100527
The 6G75 (3.8 L) engine is a six-cylinder engine. The
cylinder numbers are assigned as 1-3-5 for the right
bank and 2-4-6 for the left bank from the front of the
engine (timing belt side). This engine is fired in the
order of 1-2-3-4-5-6 cylinders.
ENGINE DIAGNOSIS
M1111000700295
ITEMS
SPECIFICATIONS
Type
V type, overhead camshaft
Number of cylinders
6
Bore mm (in)
95.0 (3.74)
Stroke mm (in)
90.0 (3.54)
Total displacement cm
3
(cu. in)
3,828 (233.6)
Compression ratio
10.0
Firing order
1-2-3-4-5-6
Valve timing
Intake valve
Opens (BTDC)
5
°
Closes (ABDC)
55
°
Exhaust valve
Opens (BBDC)
51
°
Closes (ATDC)
17
°
Lubrication system
Pressure feed, full-flow filtration
Oil pump type
Trochoid type
SYMPTOMS
PROBABLE CAUSE
REMEDY
Compression is too
low
Blown cylinder head gasket
Replace the gasket.
Worn or damaged piston rings
Replace the rings.
Worn piston or cylinder
Repair or replace the piston and/or the
cylinder block.
Worn or damaged valve seat
Repair or replace the valve and/or the
seat ring
Drop in engine oil
pressure
Engine oil level is too low
Check the engine oil level.
Malfunction of engine oil pressure switch Replace the engine oil pressure switch.
Clogged oil filter
Install a new filter.
Worn oil pump gears or cover
Replace the gears and/or the cover.
Thin or diluted engine oil
Change the engine oil to the correct
viscosity.
Stuck (opened) oil relief valve
Repair the relief valve.
Excessive bearing clearance
Replace the bearings.
Engine oil pressure
too high
Stuck (closed) oil relief valve
Repair the relief valve.
ENGINE DIAGNOSIS
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ENGINE MECHANICAL
11A-3
Noisy valves
Malfunction of lash adjuster (including
entry of air into high pressure chamber)
Check the lash adjuster.
Thin or diluted engine oil (low engine oil
pressure)
Change the engine oil.
Worn or damaged valve stem or valve
guide
Replace the valve and/or the guide.
Connecting rod
noise/main bearing
noise
Insufficient oil supply
Check the engine oil level.
Thin or diluted engine oil
Change the engine oil.
Excessive bearing clearance
Replace the bearings.
SYMPTOMS
PROBABLE CAUSE
REMEDY
SPECIAL TOOLS
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ENGINE MECHANICAL
11A-4
SPECIAL TOOLS
M1111000600630
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991958
Scan tool (MUT-III sub
assembly)
A: MB991824
Vehicle
communication
interface (V.C.I.)
B: MB991827
MUT-III USB cable
C: MB991910
MUT-III main harness
A (Vehicles with CAN
communication
system)
D: MB991911
MUT-III main harness
B (Vehicles without
CAN communication
system)
E: MB991914
MUT-III main harness
C (for Daimler
Chrysler models only)
F: MB991825
MUT-III measurement
adapter
G: MB991826
MUT-III trigger
harness
MB991824-KIT
NOTE: G: MB991826
MUT-III trigger harness is
not necessary when
pushing V.C.I. ENTER
key.
• Drive belt tension check
• Ignition timing check
• Curb idle speed check
• Idle mixture check
CAUTION
MUT-III main harness B
(MB991911) should be
used. MUT-III main
harness A and C should
not be used for this
vehicle.
MB991668
Belt tension meter set
Tool not available
Measurement of drive belt
tension (used together with
scan tool <MUT-III Sub
Assembly>)
MB991910
MB991826
MB991958
MB991911
MB991914
MB991824
MB991827
MB991825
DO NOT USE
A
B
C
D
E
F
G
DO NOT USE
B991668
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