Mitsubishi Grandis. Manual — part 662

CYLINDER HEAD AND VALVES

ENGINE OVERHAUL

11B-43

VALVE SEAT

Assemble the valve, then measure the valve stem
projection between the end of the valve stem and the
spring seating surface. If the measurement exceeds
the specified limit, replace the valve seat.

Standard value:

<Intake> 48.33 mm
<Exhaust> 48.34 mm

Limit:

<Intake> 48.83 mm
<Exhaust> 48.84 mm

VALVE SEAT RECONDITIONING
PROCEDURE

1. Before correcting the valve seat, check for

clearance between the valve guide and valve and,
if necessary, replace the valve guide.

2. Using the seat grinder, correct to obtain the

specified seat width and angle.

3. After correcting the valve seat, lap the valve and

valve seat using lapping compound. Then, check
the valve stem projection.

VALVE SEAT REPLACEMENT
PROCEDURE

1. Cut the valve seat from the inside to thin the wall

thickness. Then, remove the valve seat.

2. Rebore the valve seat hole in the cylinder head to

a selected oversize valve seat diameter.

Intake seat ring hole diameters

0.3 oversize: 35.30

− 35.33 mm

0.6 oversize: 35.60

− 35.63 mm

Exhaust seat ring hole diameters

0.3 oversize: 33.30

− 33.33 mm

0.6 oversize: 33.60

− 33.63 mm

3. Before fitting the valve seat, either heat the

cylinder head up to approximately 250

°C or cool

the valve seat in liquid nitrogen, to prevent the
cylinder head bore from galling.

4. Using a valve seat cutter, correct the valve seat to

the specified width and angle.
See "VALVE SEAT RECONDITIONING
PROCEDURE" on the previous page.

VALVE GUIDE REPLACEMENT
PROCEDURE

1. Using a press, remove the valve guide toward the

cylinder block.

AK300596

Valve stem
projection

Spring
seating
surface

AB

Valve stem
end

AK300385AB

Intake side

Exhaust side

43.5˚ – 44˚

20˚

10˚

65˚

65˚

0.9 – 1.3 mm

0.9 – 1.3 mm

AK300719AB

0.5 - 1 mm

0.5 - 1 mm

Cut

AK300720AB

Oversize hole diameter

Valve seat
height

CYLINDER HEAD AND VALVES

ENGINE OVERHAUL

11B-44

CAUTION

Do not install a valve guide of the same size
again.
2. Rebore the valve guide hole of the cylinder head

so that it fits the press-fitted oversize valve guide.

Valve guide hole diameters

0.05 oversize 11.05

− 11.07 mm

0.25 oversize 11.25

− 11.27 mm

0.50 oversize 11.50

− 11.52 mm

3. Press-fit the valve guide until it protrudes 14.0 mm

from the cylinder head top surface as shown in
the illustration.
NOTE: When press-fitting the valve guide, work
from the cylinder head top surface.
NOTE: Pay attention to the difference in length of
the valve guides. (Intake side: 45.5 mm; exhaust
side: 50.5 mm)
NOTE: After installing the valve guides, insert new
valves in them to check for smooth operation.

AK304591AB

14.0 mm

OIL PAN AND OIL PUMP

ENGINE OVERHAUL

11B-45

OIL PAN AND OIL PUMP

REMOVAL AND INSTALLATION

M1113008100527

AK304604AB

1

2

4

5

6

7

8

9

10

11

12

13

14

15

17

18

19

20

21

22

23

24

25

26

27

28

30

29

31

36 ± 3 N·m

9.0 ± 3.0 N·m

10 ± 2 N·m

19 ± 3 N·m

22 ± 4 N·m

22 ± 4 N·m

9.0 ± 2.0 N·m

23 ± 3 N·m

23 ± 3 N·m

17 ± 1 N·m

19 ± 3 N·m

39 ± 5 N·m

44 ± 5 N·m

23 ± 3 N·m

16

Apply engine oil to
all moving parts
before installation.

3

9.0 ± 1.0 N·m

9.0 ± 3.0 N·m

Removal steps

1. Drain plug

>>M<<

2. Drain plug gasket
3. Oil level sensor

<<A>> >>L<<

4. Oil filter
5. Transmission stay

<<B>> >>K<<

6. Oil pan
7. Baffle plate
8. Oil screen
9. Oil screen gasket
10.Relief plug
11.Gasket
12.Relief spring
13.Relief plunger
14.Oil filter bracket
15.Oil filter bracket gasket

<<C>> >>J<<

16.Plug

17.O-ring

<<D>> >>I<<

18.Flange bolt

>>H<<

19.Front case
20.Front case gasket
21.Oil pump cover

>>G<<

22.Oil pump driven gear

>>G<<

23.Oil pump drive gear

>>F<<

24.Crankshaft front oil seal

>>E<<

25.Oil pump oil seal

>>D<<

26.Counterbalance shaft oil seal
27.Counterbalance shaft, left
28.Counterbalance shaft, right

<<E>> >>C<<

29.Counterbalance shaft, front bearing

Removal steps (Continued)

OIL PAN AND OIL PUMP

ENGINE OVERHAUL

11B-46

REMOVAL SERVICE POINTS
<<A>> OIL FILTER REMOVAL

1. Using general service tool, remove the oil filter

from the oil filter bracket.

<<B>> OIL PAN REMOVAL

1. Remove the oil pan bolts.
2. Insert the special tool Oil pen remover

(MD998727) into the joint between the cylinder
block and oil pan by tapping the tool with a
hammer.

3. Remove the oil pan by tapping an edge of the

special tool Oil pen remover (MD998727) with a
hammer to move it sideways.

<<C>> PLUG REMOVAL

Fit the teeth of the special tool in notches of the plug
as shown in the drawing and support the tool with the
special tool to loosen the plug.

• Plug wrench (MD998162)

• Plug wrench retainer (MD998783)

<<D>> FLANGE BOLT REMOVAL

1. Remove the plug on the side of the cylinder block.
2. Insert a Phillips screwdriver (shank diameter 8

mm) into the plug hole to lock the counterbalance
shaft.

3. Loosen the flange bolt.

<<F>> >>B<<

30.Counterbalance shaft, rear bearing,

right

<<F>> >>A<<

31.Counterbalance shaft, rear bearing,

left

Removal steps (Continued)

AK300169

General service tool

AD

AK300170

MD998727

AE

AK300171

MD998162

MD998783

AD

AK300172

AK300173