Mitsubishi Grandis. Manual — part 666
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-59
>>D<< CONNECTING ROD BEARING
INSTALLATION
1. Measure the crankshaft pin diameter and confirm
its classification from the following table. On a
crankshaft supplied as a service part,
identification marks of its pins are stamped at the
positions shown in the illustration.
2. If the crankshaft pin outside diameter identification
mark is "I," for example, select a bearing whose
identification mark is "1."
If there is no identification color paint on the
crankshaft, measure the pin outside diameter and
select a bearing appropriate for the measured
value.
3. Install the selected bearing in the big end and in
the cap of the connecting rod.
>>E<< PISTON AND CONNECTING ROD
INSTALLATION
1. Apply engine oil on the circumference of the
piston, piston rings, and oil ring.
2. Arrange the piston ring and oil ring gaps (side rail
and spacer) as shown in the illustration.
3. Rotate the crankshaft so that the crank pin is on
the center of the cylinder bore.
4. Use suitable thread protectors on the connecting
rod bolts before inserting the piston and
connecting rod assembly into the cylinder block.
Care must be taken not to nick the crank pin.
5. Insert the piston and connecting rod assembly
into the cylinder with the front mark on the piston
crown pointing to the timing belt side.
6. Using a suitable piston ring compressor tool,
install the piston and connecting rod assembly
into the cylinder block.
Crankshaft pin outside
diameter
Connecting
rod bearing
Identification
mark
Size mm
Identification
mark
I
44.995
− 45.000
1
II
44.985
− 44.995
2
III
44.980
− 44.985
3
AK304412
Locations of crankshaft pin diameter
marks
No. 3
No. 1
No. 2
No. 4
AB
AK304598
Connecting bearing
Identification
mark position
AB
AK202730
No. 1
No. 2
Side rail
Side rail
AB
AK300192
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-60
>>F<< CONNECTING ROD CAP
INSTALLATION
1. Verifying the mark made during disassembly,
install the bearing cap to the connecting rod. If the
connecting rod is new with no index mark, make
sure that the bearing locking notches are on the
same side as shown.
2. Make sure that the connecting rod big end side
clearance meets the specification.
Standard value: 0.10
− 0.25 mm
Limit: 0.4 mm
>>G<< CONNECTING ROD CAP NUT
TIGHTENING
1. The connecting rod bolts should be examined
before reuse. If the bolt threads are damaged, the
bolt should be replaced.
Hand-thread the nut to the full length of the bolt
threads. If the nut does not run down smoothly,
the bolt should be replaced.
2. Before installing each nut, apply engine oil to the
threaded portion and bearing surface of the nut.
3. Loosely tighten each nut to the bolt.
4. Then tighten the nuts alternately to the specified
torque to install the cap properly.
Tightening torque: 20
± 2 N⋅m
5. Make a paint mark on the head of each nut.
6. Make a paint mark on the bolt end at the position
90 to 94 degrees from the paint mark made on the
nut in the direction of tightening the nut.
CAUTION
• If the nut is turned less than 90 degrees,
proper fastening performance may not be
achieved. Be careful to tighten the nut exactly
90 degrees.
• If the nut is overtightened (exceeding 94
degrees), loosen the nut completely and then
retighten it by repeating the tightening
procedure from step 3.
7. Turn the nut 90 to 94 degrees and make sure that
the paint marks on the nut and bolt are aligned.
INSPECTION
M1113008500547
PISTON
Replace the piston if scratches or seizure is evident
on its surfaces (especially the thrust surface).
Replace the piston if it is cracked.
PISTON PIN
1. Insert the piston pin into the piston pin hole with
your thumb. You should feel a slight resistance.
Replace the piston pin if it can be easily inserted
or there is an excessive play.
2. The piston and piston pin must be replaced as an
assembly.
PISTON RING
1. Check the piston ring for damage, excessive
wear, and breakage. Replace if defects are
evident. If the piston has been replaced, the
piston rings must also be replaced.
AK300193
Notches
Cylinder
number
AD
AK300194
AK301477AD
Paint mark
Paint
mark
90˚ to 94˚
Nut
Bolt
PISTON AND CONNECTING ROD
ENGINE OVERHAUL
11B-61
2. Check for clearance between the piston ring and
ring groove. If it exceeds the limit, replace the ring
or piston, or both.
Standard value:
Number 1: 0.03
− 0.07 mm
Number 2: 0.02
− 0.06 mm
Limit: 0.1 mm
3. Insert the piston ring into the cylinder bore. Force
the ring down with a piston, the piston crown
being in contact with the ring, to correctly position
it at right angles to the cylinder wall. Then,
measure the end gap with a feeler gauge.
If the ring gap is excessive, replace the piston
ring.
Standard value:
Number 1: 0.15
− 0.30 mm
Number 2: 0.28
− 0.43 mm
Oil: 0.10
− 0.40 mm
Limit:
Number 1, Number 2: 0.8 mm
Oil: 1.0 mm
CRANKSHAFT PIN OIL CLEARANCE
<PLASTIC GAUGING MATERIAL
METHOD>
1. Remove oil from the crankshaft pin and the
connecting rod bearing.
2. Cut plastic gauging material to the same length as
the width of the bearing and place it on the pin,
parallel with its axis.
3. Install the connecting rod cap carefully and tighten
the nuts to the specified torque.
4. Carefully remove the connecting rod cap.
5. Measure the width of the plastic gauging material
at its widest part by using a scale printed on the
plastic gauging material package.
Standard value: 0.02
− 0.05 mm
Limit: 0.1 mm
AK300195
AK301481AD
Piston ring
Piston ring gap
Push in by
piston
AK300196
Plastic gauging
material
AD
AK300197
Plastic gauging
material
AD
CRANKSHAFT AND CYLINDER BLOCK
ENGINE OVERHAUL
11B-62
CRANKSHAFT AND CYLINDER BLOCK
REMOVAL AND INSTALLATION
M1113008700756
CAUTION
On the flexible flywheel equipped engines, do not remove any of the bolts "A" of the flywheel shown
in the illustration. The balance of the flexible flywheel is adjusted in an assembled condition.
Removing the bolt, therefore, can cause the flexible flywheel to be out of balance giving and resulting
in damage.
AK304605AB
6
7
8
9
10
11
12
14
13
15
16
17
18
19
20
11 ± 1 N·m
132 ± 5 N·m
25 ± 2 N·m
5
9.0 ± 1.0 N·m
11 ± 1 N·m
→ + 90˚
25 ± 2 N·m
→ + 90˚
1
3
A
4
2
132 ± 5 N·m
Apply engine oil to
all moving parts
before installation.
Removal steps
1. Flywheel bolt (M/T)
2. Adapter plate (M/T)
3. Flywheel (M/T)
4. Crankshaft bushing (M/T)
5. Drive plate bolt (A/T)
6. Adapter plate (A/T)
7. Drive plate (A/T)
8. Crankshaft bushing (A/T)
9. Rear plate
10.Bell housing cover
>>E<<
11.Oil seal case
>>D<<
12.Oil seal
>>C<<
13.Bearing cap bolt (Head 14)
>>C<<
14.Bearing cap bolt (Head 17)
>>C<<
15.Bearing cap
Removal steps (Continued)
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