Mitsubishi Lancer (4A9 engine). Manual - part 22

GENERAL INFORMATION

ENGINE MECHANICAL <4A9>

11A-2

GENERAL INFORMATION

M1111000101962

Item

4A91

4A92

Total displacement mL

1,499

1,590

Bore 

× Stroke mm

75.0 

× 84.8

75.0 

× 90.0

Compression ratio

10.5

11.0

Compression chamber

Pentroof

Camshaft arrangement

DOHC

Number of valve

Intake

8

Exhaust

8

Valve timing

Intake opening

BTDC 41

° − ATDC 9°

Intake closing

ABDC 11

° − ABDC 61°

Exhaust opening

BBDC 39

°

Exhaust closing

ATDC 5

°

Fuel system

Electronically controlled multipoint fuel injection

Rocker arm

Not equipped

Auto-lash adjuster

Not equipped

SERVICE SPECIFICATIONS

M1112000302768

Item

Standard value

Limit

Alternator and others belt tension (When 
checked)

Vibration frequency Hz

140 

− 171

−

Tension N

392 

− 588

−

Deflection mm (Reference)

9.5 

− 12.2

−

Alternator and others belt tension (When 
adjusted)

Vibration frequency Hz

148 

− 164

−

Tension N

441 

− 539

−

Deflection mm (Reference)

10.2 

− 11.5

−

Alternator and others belt tension (When 
replaced)

Vibration frequency Hz

198 

− 221

−

Tension N

784 

− 980

−

Deflection mm (Reference)

6.3 

− 7.6

−

Power steering oil pump drive belt tension

Vibration frequency Hz 
(Reference)

108 

− 221

−

Tension N (Reference)

169 

− 720

−

Deflection mm (Reference)

18.2 or less

−

Basic ignition timing

5

° BTDC ± 3°

−

Ignition timing

Approximately 
10

° BTDC

−

Idle speed r/min

750 

± 100

−

CO contents %

0.3 or less

−

SEALANTS AND ADHESIVE

ENGINE MECHANICAL <4A9>

11A-3

SEALANTS AND ADHESIVE

M1112000502687

Item

Specified Sealant and adhesive

Remark

Timing chain tensioner cover

ThreeBond 1217G (Mitsubishi Genuine 
Part No,1000A923), LOCTITE 5900, 
LOCTITE 5970 or equivalent

Semi-drying sealant

Cylinder head cover assembly
Timing chain case assembly
Cylinder block
Cylinder head gasket 
Engine oil pan

ThreeBond 1217G (Mitsubishi Genuine 
Part No.1000A923), ThreeBond 1227D, 
LOCTITE 5900, LOCTITE 5970 or 
equivalent

Crankshaft rear oil seal case assembly

Flywheel bolt <M/T>

LOCTITE 2701 or equivalent

Anaerobic adhesive

Drive plate bolt <A/T>

LOCTITE 2701, ThreeBond 1324 or 
equivalent

Timing chain case assembly (water 
pump)

ThreeBond 1227D, ThreeBond 1207F 
or equivalent

Semi-drying sealant

HC contents ppm

200 or less

−

Valve clearance (at cold) mm

Inlet valve

0.22 

± 0.04

−

Exhaust valve

0.30 

± 0.04

−

Compression pressure (at engine speed of 300 r/min) kPa <4A91>

1,550

Minimum 
1,100

Compression pressure (at engine speed of 250 r/min) kPa <4A92>

1,550

Minimum 
1,100

Compression pressure difference of all cylinders kPa

−

Maximum 98

Intake manifold vacuum kPa

−

Minimum 60

Cylinder head bolt outside diameter difference mm

0 

− 0.15

−

Item

Standard value

Limit

SPECIAL TOOLS

ENGINE MECHANICAL <4A9>

11A-4

SPECIAL TOOLS

M1112000603074

Tool

Number

Name

Use

B992080

a

b

MB992080
a: MB992081
b: MB992082

Belt tension meter set
a: Belt tension meter
b: Microphone assembly

Drive belt tension check

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991955

a: MB991824
b: MB991827
c: MB991910
d: MB991911
e: MB991825
f: MB991826

M.U.T.-III sub assembly

a: Vehicle communication 

interface (V. C. I.)

b: M.U.T.-III USB cable
c: M.U.T.-III main harness A 

(Vehicles with CAN 
communication system)

d: M.U.T.-III main harness B 

(Vehicles without CAN 
communication system)

e: M.U.T.-III adapter harness
f: M.U.T.-III trigger harness

CAUTION

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

• Checking the ignition timing

• Checking the idle speed

B992276

MB992276

Drive belt remover

Power steering oil pump drive 
belt removal

MB992858

SPECIAL TOOLS

ENGINE MECHANICAL <4A9>

11A-5

MB992858

Drive belt installer

Power steering oil pump drive 
belt installation

B991992

MB991992

Torque wrench adaptor

Removal and installation of 
V.V.T. sprocket assembly 
mounting bolt

MD998772

MD998772

Valve spring compressor

Valve spring compression

B992090

MB992090

Retainer holder attachment

MB992089

Retainer holder C

MB992085

Valve stem seal pliers

Valve stem seal removal

B992677

MB992677

Valve stem seal installer 
adjustable

Valve stem seal press-fitting

Tool

Number

Name

Use