Mitsubishi Outlander XL. Manual - part 155

GROUP 11A

ENGINE MECHANICAL

CONTENTS

GENERAL INFORMATION............

11A-2

ENGINE DIAGNOSIS...............

11A-2

SERVICE SPECIFICATIONS.........

11A-3

SEALANTS.......................

11A-4

SPECIAL TOOLS..................

11A-4

ON-VEHICLE SERVICE.............

11A-8

GENETATOR DRIVE BELT TENSION CHECK
...............................

11A-8

AUTO-TENSIONER CHECK...........

11A-8

DRIVE BELT TENSION CHECK AND
ADJUSTMENT.....................

11A-9

VALVE CLEARANCE CHECK AND ADJUSTMENT
..............................

11A-12

ROCKER ARM PISTON OPERATION CHECK
..............................

11A-13

IGNITION TIMING CHECK.........

11A-14

CURB IDLE SPEED CHECK.........

11A-16

IDLE MIXTURE CHECK............

11A-16

COMPRESSION PRESSURE CHECK. . . .

11A-17

MANIFOLD VACUUM CHECK.........

11A-19

LASH ADJUSTER CHECK...........

11A-19

CRANKSHAFT PULLEY.............

11A-21

REMOVAL AND INSTALLATION......

11A-21

CAMSHAFT OIL SEAL.............

11A-24

REMOVAL AND INSTALLATION......

11A-24

CAMSHAFT AND VALVE STEM SEAL
..............................

11A-27

REMOVAL AND INSTALLATION......

11A-27

OIL PAN AND OIL STRAINER......

11A-37

REMOVAL AND INSTALLATION......

11A-37

INSPECTION....................

11A-41

CRANKSHAFT FRONT OIL SEAL.....

11A-42

REMOVAL AND INSTALLATION......

11A-42

CRANKSHAFT REAR OIL SEAL......

11A-43

REMOVAL AND INSTALLATION......

11A-43

CYLINDER HEAD GASKET..........

11A-45

REMOVAL AND INSTALLATION......

11A-45

TIMING BELT...................

11A-49

REMOVAL AND INSTALLATION......

11A-49

INSPECTION....................

11A-54

ENGINE ASSEMBLY...............

11A-54

REMOVAL AND INSTALLATION......

11A-54

11A-1

GENERAL INFORMATION

M11102000001USA0000010001

The 6B31 (3.0 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)

87.6 (3.45)

Stroke mm (in)

82.9 (3.26)

Total displacement cm3(cu. in)

2,998 (182.9)

Compression ratio

9.5

Firing order

1-2-3-4-5-6

Valve timing

Intake valve

Opens (BTDC)

-1° <Low speed cam>
18° <High speed cam>

Closes (ABDC)

37° <Low speed cam>
86° <High speed cam>

Exhaust valve

Opens (BBDC)

55°

Closes (ATDC)

17°

Lubrication system

Pressure feed, full-flow filtration

Oil pump type

Trochoid type

ENGINE DIAGNOSIS

M11102000007USA0000010000

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

Incorrect valve clearance <Intake side>

Adjust valve clearance

11A-2

ENGINE MECHANICAL

GENERAL INFORMATION

SYMPTOMS

PROBABLE CAUSE

REMEDY

Malfunction  of  lash  adjuster  (including
entry  of  air  into  high  pressure  chamber)
<Exhaust side>

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.

SERVICE SPECIFICATIONS

M11102000003USA0000010000

Item

Standard value

Limit

Power  steering  oil  pump  drive  belt  tension
(When checked)

Vibration frequency Hz

128 - 165

-

Tension N (lb)

294 - 490 (66 - 110)

-

Deflection

 (Reference)

mm (in)

11.9  -  15.6  (0.47  -
0.61)

-

Power  steering  oil  pump  drive  belt  tension
(When adjusted)

Vibration frequency Hz

138 - 157

-

Tension N (lb)

343 - 441 (77 - 99)

-

Deflection

 (Reference)

mm (in)

12.7  -  14.6  (0.50  -
0.57)

-

Power  steering  oil  pump  drive  belt  tension
(When replaced)

Vibration frequency Hz

165 - 196

-

Tension N (lb)

490 - 686 (110 - 154) -

Deflection

 (Reference)

mm (in)

9.2  -  11.9  (0.36  -
0.47)

-

Basic ignition timing at idle

5°BTDC ± 3°

-

Actual ignition timing at curb idle

Approximately

 10°

BTDC

-

CO contents %

0.5 or less

-

HC contents ppm

100 or less

-

Curb idle speed r/min

600 ± 100

-

Compression pressure (200 r/min) kPa (psi)

1,460 (212)

Minimum
1,050 (153)

Compression pressure difference of all cylinder kPa (psi)

-

98 (14)

Intake manifold vacuum at curb idle kPa (in Hg)

-

Minimum
60 (18)

Auto-tensioner rod protrusion amount mm (in)

9.1  -  13.4  (0.36  -
0.52)

-

ENGINE MECHANICAL

11A-3

SERVICE SPECIFICATIONS

SEALANTS

M11102000005USA0000010000

Item

Specified sealant

Engine  upper  oil  pan,  engine  lower  oil
pan

3M™ AAD Part No.8672, 8704, 3M™ AAD Part No.8679/8678 or
equivalent

Engine oil pressure switch

3M™ ADD Part number 8672 or equivalent

SPECIAL TOOLS

M11102000006USA0000010000

Tool

Tool number and name Supersession

Application

B992080

A

B

MB992080
Belt tension meter set

A: MB992081
Belt tension meter
B: MB992082
Microphone assembly

Tool not available

Drive belt tension check

11A-4

ENGINE MECHANICAL

SEALANTS