Mitsubishi Grandis. Manual — part 665
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-55
1. Mark the cylinder number on the side of the
connecting rod big end for correct reassembly.
2. Keep the removed connecting rods, caps, and
bearings in that order according to the cylinder
number.
<<B>> PISTON PIN REMOVAL
The special tool Piston pin setting tool (MD998780),
consists of the elements shown in the drawing.
1. Insert the tool element, Push rod, into the piston
from the front mark side, then attach the element,
Guide C, to the push rod.
2. Place the piston and connecting rod assembly on
the element, Base, with the front mark facing up.
3. Use a press to remove the piston pin.
NOTE: Keep the disassembled pistons, piston
pins and connecting rods cylinder by cylinder.
INSTALLATION SERVICE POINTS
>>A<< PISTON PIN INSTALLATION
1. When replacing a piston, check the cylinder bore
size mark stamped at the indicated location on the
cylinder block and select an appropriate
replacement piston using the following table.
AK301562
Push
rod
Guide B
Guide C
Guide A: 17.9 mm
Guide A: 18.9 mm
Guide A: 20.9 mm
Guide A: 21.9 mm
Base
AB
AK202781
Push rod
Front mark
Base
Front
mark
Guide C
AC
AK301530
No.4
No.3
No.1
No.2
Timing belt side
AD
Crankshaft
bore size mark
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-56
NOTE: The piston size mark is located on the
piston top surface.
2. Measure the following dimensions:
A: Piston pin insertion hole length
B: Distance between piston bosses
C: Piston pin length
D: Connecting rod small end width
3. Obtain dimension L from the measurements using
the following formula.
L = [(A-C)
− (B-D)] ÷ 2
4. Insert the tool element, Push rod, into the piston
pin and attach the element, Guide A, to the push
rod end.
5. Assemble the connecting rod with the piston with
their front marks facing in the same direction.
6. Apply engine oil to the outside surface of the
piston pin.
7. Insert the assembly of piston pin, Push rod, and
Guide A (put together in step 4.) into the piston
holes from the front mark side.
8. Screw the tool element, Guide B, into the tool
element, Guide A until the gap between both the
elements is equal to the dimension L (obtained in
step 3.) plus 3 mm.
9. Place the piston and connecting rod assembly
onto the element, Piston setting base, with the
front marks facing up.
10.Install the piston pin using a press. If the required
press force is less than the standard value,
replace the piston and piston pin assembly or the
connecting rod, or both.
Standard value: 7,350
− 17,200 N
Cylinder bore size mark
Piston size mark
I
A
II
No mark
III
C
AK202784
Connecting rod
Piston
Piston pin
D
C
B
A
AE
AK301480
3 mm + L
Guide A
Guide B
AC
AK202782
Push rod
Front mark
Piston pin
Base
Front
mark
Guide B
Guide A
AB
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-57
11.Check that the piston moves smoothly.
AK301796
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-58
>>B<< OIL RING INSTALLATION
1. Fit the oil ring spacer into the piston ring groove.
CAUTION
Do not use a piston ring expander when
installing side rail.
2. Install the upper side rail.
To install the side rail, first fit one end of the rail
into the piston groove, then press the remaining
portion into position by hand. See illustration.
NOTE: The side rails and spacer may be installed
in either direction.
NOTE: New spacers and side rails are colored for
identification of their sizes.
3. Install the lower side rail in the same manner as
described in step 2.
4. Make sure that the side rails move smoothly in
both directions.
>>C<< PISTON RING NUMBER 2/PISTON
RING NUMBER 1 INSTALLATION
1. Using the piston ring expander, fit number 2 into
the number 2 groove of piston.
NOTE: Install piston rings with identification mark
facing up, to the piston crown side.
2. Install the number 1 piston ring in the same
manner as step 1.
Identification mark:
Number 1 ring: 1R
Number 2 ring: 2R
NOTE: Confirm the profile for No.1 and No.2
piston rings carefully. Install them correctly by
careful attention to the direction of top and
bottom.
NOTE: The identification mark and the size mark
are stamped on the upper plane of the piston ring
(piston top side).
3. To prevent wrong installation, check the
identification mark of each piston ring. The
identification mark is stamped near the ring gap.
Size
Identification color
Standard
None
0.50 mm oversize
diameter
Red
AK300190
Side rail end
AD
AK304597AB
Upper
side rail
Spacer
Lower
side rail
Size
Size mark
Standard
None
0.50 mm oversize
diameter
50
AK300191
Piston ring
expander
AD
AK301452AD
No.1
No.2
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