Mitsubishi Grandis. Manual — part 634

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-13

2. Turn the ignition switch to the "LOCK" (OFF)

position and then connect the MUT-III to the
diagnosis connector.

3. Set the timing light to the power supply line

(terminal No.1) of the ignition coil No.1.
NOTE: The power supply line is looped and also
longer than the other ones.

4. Start the engine and let it run at idle.
5. Check that ignition timing is at the standard value.

Standard value: approximately 10

° BTDC

6. Run the engine at 2,500 r/min for 2 minutes.
7. Set the CO, HC tester.
8. Check the CO contents and the HC contents at

idle.

Standard value

CO contents: 0.5 % or less
HC contents: 100 ppm or less

9. If there is a deviation from the standard value,

inspect the MPI system (Refer to

P.13A-20

,

GROUP 13A

− Troubleshooting − Inspection

Chart for Diagnosis Code).

10.Turn the ignition switch to the "LOCK" (OFF)

position and then remove the MUT-III.

COMPRESSION PRESSURE CHECK

M1111002600722

1. Before inspection, set the vehicle to the

pre-inspection condition.

2. Remove all of the ignition coils and spark plugs.

3. Disconnect the crank angle sensor connector.

NOTE: Doing this will prevent the
engine-ECU<M/T> or engine-A/T-ECU<A/T> from
carrying out ignition and fuel injection.

WARNING

Keep away from the spark plug hole when
cranking. If compression is measured with
water, oil, fuel, etc., that has come from
cracks inside the cylinder, these materials
will become heated and will gush out from
the spark plug hole, which is dangerous.

4. Cover the spark plug hole with a shop towel etc.,

and after the engine has been cranked, check that
no foreign material is adhering to the shop towel.

5. Set compression gauge to one of the spark plug

holes.

6. Crank the engine with the throttle valve fully open

and measure the compression pressure.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AK305596AB

No. 1 Ignition coil

AK303421AB

Crank angle
sensor
connector

AK204360

Compression gauge

AE

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-14

Standard value (at engine speed of 200

r/min):

1,560 kPa

Limit (at engine speed of 200 r/min):

Minimum 1130 kPa

7. Measure the compression pressure for all the

cylinders, and check that the pressure differences
of the cylinders are below the limit.

Limit: Maximum 98 kPa

8. If there is a cylinder with compression or a

compression difference that is outside the limit,
pour a small amount of engine oil through the
spark plug hole, and repeat the operations in
steps from 5 to 7.
(1) If the compression increases after oil is added,

the cause of the malfunction is a worn or
damaged piston ring and/or cylinder inner
surface.

(2) If the compression dose not rise after oil is

added, the cause is a burnt or defective valve
seat, or pressure is leaking from the gasket.

9. Connect the crank angle sensor connector.
10.Install the spark plugs and ignition coils.

11.Use the MUT-III to erase the diagnosis codes.

NOTE: This will erase the diagnosis code
resulting from the crank angle sensor connector
being disconnected.

MANIFOLD VACUUM CHECK

M1111002700644

1. Before inspection, set the vehicle to the

pre-inspection condition.

2. Turn the ignition switch to the "LOCK" (OFF)

position and then connect the MUT-III to the
diagnosis connector.

3. Attach a three-way joint to the vacuum hose

between the fuel pressure regulator and the inlet
manifold, and connect a vacuum gauge.

4. Start the engine and check that idle speed is

within the standard valve.

Standard value: 700

± 100 r/min

5. Check the inlet manifold vacuum.

Limit: Minimum 60 kPa

6. Turn off the ignition switch.
7. Remove the vacuum gauge and the three-way

joint, and then connect the vacuum hose.

8. Remove the engine tachometer or the MUT-III.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AK204361

Vacuum gauge

Fuel pressure regulator

Inlet manifold

AC

CRANKSHAFT PULLEY

ENGINE MECHANICAL

11A-15

CRANKSHAFT PULLEY

REMOVAL AND INSTALLATION

M1112001600584

REMOVAL SERVICE POINT
<<A>> DRIVE BELT REMOVAL

The following operations will be needed due to the
introduction of the serpentine drive system with the
drive belt auto-tensioner.

1. Securely insert the spindle handle or ratchet

handle with a 12.7 mm insertion angle into the jig
hole of the auto-tensioner.

2. Rotate the auto-tensioner anti-clockwise and align

hole A with hole B.

CAUTION

To reuse the drive belt, draw an arrow indicating
the rotating direction (clockwise) on the back of
the belt using chalk, etc.

3. Insert an L-shaped hexagon wrench, etc. into the

hole to fix and then remove the drive belt.

Pre-removal Operation
• Engine Room Side Cover Removal.

Post-installation Operation
• Drive Belt Tension Check (Refer to

P.11A-7

).

• Engine Room Side Cover Installation.

AC312946 AB

AC312946

1

2

25 ± 4 N·m

Removal steps

<<A>>

1.

Drive belt

2.

Crank shaft damper pulley

AC301703

AC301704AB

Hole A

Auto-tensioner

Hole B

AC301705AB

L-shaped
hexagon
wrench

Auto-tensioner

CAMSHAFT AND VALVE STEM SEAL

ENGINE MECHANICAL

11A-16

CAMSHAFT AND VALVE STEM SEAL

REMOVAL AND INSTALLATION

M1112006600396

CAUTION

* Remove and assemble the marked parts in each cylinder unit.

Post-installation Operation
• Drive Belt Tension Check (Refer to

P.11A-7

).

• Valve Clearance Check and Adjustment (Refer to

P.11A-9

).

AC312947AB

1

10

9

8

6

5

4

3

2

11

12

N

3.0 ± 0.5 N·m

13 ± 2 N·m

11 ± 1 N·m

3.5 ± 0.5 N·m

24 ± 3 N·m

44 ± 5 N·m

5.0 ± 1.0 N·m

N

(Engine oil)

N

7

Camshaft removal steps

•

Timing belt upper cover (Refer to

P.11A-33

)

>>K<<

1.

Engine cover

2.

Engine cover bracket

3.

Rocker cover PCV hose connection

4.

Rocker cover breather hose
connection

•

Air cleaner (Refer to GROUP 15,
Air cleaner

P.15-3

)

•

Ignition coils (Refer to GROUP 16,
Ignition System

− Ignition Coil

P.16-27

)

5.

Control wiring harness connection

6.

Engine hanger

>>J<<

7.

Oil control valve

>>J<<

8.

O-ring

9.

Rocker cover assembly

10. Rocker cover gasket
11. Spark plug guide oil seals
12. Accumulator assembly
•

Valve timing belt (Refer to

P.11A-33

).

Camshaft removal steps