Mitsubishi 380. Manual — part 750

GENERAL DESCRIPTION

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ENGINE MECHANICAL <3.8L ENGINE>

11A-2

GENERAL DESCRIPTION

M1111000100419

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.

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)

9

°

Closes (ABDC)

59

°

Exhaust valve

Opens (BBDC)

47

°

Closes (ATDC)

21

°

Lubrication system

Pressure feed, full-flow filtration

Oil pump type

Trochoid type

ENGINE DIAGNOSIS

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ENGINE MECHANICAL <3.8L ENGINE>

11A-3

ENGINE DIAGNOSIS

M1111000700273

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.

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.

SPECIAL TOOLS

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ENGINE MECHANICAL <3.8L ENGINE>

11A-4

SPECIAL TOOLS

M1111000600986

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION APPLICATION

Diagnostic Tool (MUT-III)

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

• Erasing the diagnostic trouble

code

CAUTION

For vehicles with CAN
communication, use MUT-III main
harness A to send simulated
vehicle speed. If you connect
MUT-III main harness B instead,
the CAN communication does
not function correctly.

MB991668
Belt tension meter set

Tool not available

Drive belt tension check [used
together with Diagnostic Tool
(MUT-III) ]

MB991800
Pulley holder

MB991800-01

Holding the crankshaft pulley

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

B991668

MB991800

SPECIAL TOOLS

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ENGINE MECHANICAL <3.8L ENGINE>

11A-5

MB991802
Pin B

MB991802-01

Holding the crankshaft pulley

MB990767
End yoke holder

MB990767-01

Holding the camshaft sprocket

MD998715
Crankshaft pulley holder
pin

MIT308239

Holding the camshaft sprocket

MD998443
Auto-lash adjuster holder

MD998443-01

Holding the auto-lash adjuster

MD998713
Camshaft oil seal
installer

MD998713-01

Press-in of the camshaft oil seal

MB991559
Camshaft oil seal adapter
installer

MB991559-01

Press-fitting the camshaft oil seal
(left bank side)

MD998051
Cylinder head bolt
wrench

MD998051-01 or
General service
tool

Cylinder head bolt removal and
installation

MD998717
Crankshaft front oil seal
installer

MD998717-01

Press-in of the crankshaft front oil
seal

MD998781
Flywheel stopper

General service
tool

Securing the drive plate

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION APPLICATION

MB991802

B990767

D998443

D998713

B991559

D998781