Mitsubishi Lancer Evolution 7. Manual — part 171
ENGINE OVERHAUL -
Piston and Connecting Rod
11B-61
4. If there is no identification, measure the oil clearance
and select.
"
FA CONNECTING ROD CAP INSTALLATION
1. Align the marks made during disassembly, and install
the bearing cap onto the connecting rod. When using
a new connecting rod that has no match marks, assemble
so that the bearing rotation-preventing notch comes to
the same side as shown in the illustration.
2. The plasticity range tightening method is adopted for the
connecting rod bolt and nut, so elongate and inspect
the bolt before reusing it.
Inspect that the bolt is elongated to the extent that the
nut can be screwed onto the last thread when screwed
by hand. If the nut cannot be screwed on smoothly to
the end, the bolt threads are elongated and the bolt must
be replaced.
3. Apply engine oil on the nut’s threads and seat surface
before installing the nut.
4. After installing each nut onto the bolt with fingers,
alternately tighten the nuts to assemble the cap correctly.
5. Tighten the nut at a 20 N•m torque.
6. Make a paint mark on the head of the nut.
7. Using the position of the mark painted on the nut as
reference, make paint marks on the bolt at the 90_ to
94_ positions in the nut tightening direction.
8. Tighten the nut between 90_ and 94_, and confirm that
the paint marks on the nut and bolt match.
Caution
If the tightening angle is less than 90_, the connection
performance may not be attained, so take special
care to the tightening angle when tightening.
If the tightening angle is larger than 94_, completely
loosen the nut and start again from step 1.
Cylinder No.
Rotation-
preventing
notch
Paint marks
90_ - 94_
Paint marks
Nut
Bolt
ENGINE OVERHAUL -
Piston and Connecting Rod
11B-62
9. Check that the thrust clearance at the large end of the
connecting rod is correct.
Standard value: 0.10 - 0.25 mm
Limit value: 0.4 mm
INSPECTION
1. PISTON RING
(1) Inspect the clearance between the piston ring and
ring groove. If the limit value is exceeded, replace
the piston ring or the piston ring and piston.
Standard value:
No. 1 0.03 - 0.07 mm
No. 2 0.02 - 0.06 mm
Limit value: 0.1 mm
(2) Place the piston ring and oil ring side rail into the
cylinder bore, and contact the piston front face side,
and press in. After attaining a right angle, measure
the closed gap with a thickness gauge.
NOTE
Press in the closed gap of the piston ring and oil
ring’s side rail at the position of the piston shown
in the illustration, and measure the closed gap.
Standard value:
No. 1 0.20 - 0.30 mm
No. 2 0.35 - 0.50 mm
Oil ring 0.10 - 0.40 mm
Standard value:
No. 1 0.8 mm
No. 2 0.8 mm
Oil ring 1.0 mm
Press in with piston
Piston ring
Closed gap
ENGINE OVERHAUL -
Piston and Connecting Rod
11B-63
2. CRANKSHAFT PIN OIL CLEARANCE (PLASTIC
GAUGE METHOD)
(1) Wipe off the oil from the crankshaft pin and connecting
rod bearing.
(2) Set a plastic gauge as long as the bearing width
on the pin shaft so that straightly aligned with the
shaft centre.
(3) Carefully set the connecting rod cap, and tighten the
nut at the specified torque 20 ± 2 N•m + 90_ to
94_
(4) Remove the nut, and carefully remove the connecting
rod cap.
(5) Measure the width of the crushed plastic gauge (at
the section crushed the most) with the scale printed
on the plastic gauge bag.
Standard value: 0.03 - 0.05 mm
Limit value: 0.1 mm
ENGINE OVERHAUL -
Crankshaft and Cylinder Block
11B-64
CRANKSHAFT AND CYLINDER BLOCK
REMOVAL AND INSTALLATION
25 ± 2 N•m + 90_ - 100_
2
1
Apply engine oil on
all sliding sections
before installing.
4
5
6
7
3
8
9
10
11
132 ± 5 N•m
11 ± 1 N•m
11 ± 1 N•m
9 ± 1 N•m
32 ± 2 N•m
14
13
12
15
Removal steps
1. Flywheel bolt
2. Flywheel
3. Rear plate
4. Bell housing cover
"
EA 5. Rear oil seal case
"
DA 6. Rear oil seal
"
CA 7. Bearing cap bolt
"
CA 8. Beam bearing cap
"
BA 9. Crankshaft bearing lower
10. Crankshaft
"
BA 11. Crankshaft bearing upper
"
AA 12. Thrust bearing
13. Check valve
14. Oil jet
15. Cylinder block
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