Mazda Engine SKYACTIV-G 2.5. Manual — part 10
MECHANICAL
01-10–24
Snap Ring Disassembly Note
1. Before removing the snap ring, verify that the large end of connecting rod drops under its own weight with no
resistance. (See 01-10-35 PISTON AND CONNECTING ROD INSPECTION.)
2. Remove the snap ring using a flathead
screwdriver.
Lower Cylinder Block Disassembly Note
1. Before removing the lower cylinder block, inspect the crankshaft end play. (See 01-10-36 CRANKSHAFT
INSPECTION.)
2. Loosen the lower cylinder block installation bolts
B in two or three passes in the order shown in the
figure and remove them.
3. Loosen the lower cylinder block installation bolts
A in two or three passes in the order shown in the
figure and remove them.
SNAP RING
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ENGINE
FRONT
8
9
5
1
3
7
10
6
2
4
B
B
B
B
B
B
B
B
B
B
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3
7
10
6
2
4
8
9
5
1
ENGINE
FRONT
A
A
A
A
A
A
A
A
A
A
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MECHANICAL
01-10–25
01-10
4. Using a screwdriver wrapped in a cloth, peel the
sealant away a little at a time, and remove the
lower cylinder block.
Caution
• Do not apply excessive force to the
screwdriver. Otherwise, the lower
cylinder block could be damaged.
• Be careful not to scratch or damage the
seal surface. Otherwise, it could cause
oil leakage.
Thrust Bearing And Main Bearing Disassembly Note
1. The removed thrust bearings and main bearings are to be kept so that they can be assembled to the same
positions and in the direction as before removal.
Crankshaft Disassembly Note
Caution
• Placing the crankshaft on a disassembly bench will deform or damage it because the plate for the
crankshaft position sensor signal detection installed to the crankshaft is larger than the
counterweight. Therefore, set wood blocks or similar objects on the both sides of the crankshaft
so that the plate does not contact the disassembly bench directly when placing the crankshaft on
the bench.
End Of Sie
CYLINDER HEAD INSPECTION
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1. Inspect the cylinder head surface for cracks and other damage using a red dye penetrant.
• If there is a malfunction, replace the cylinder head.
2. Measure the combustion chamber side of the
cylinder head for distortion in six directions as
shown in the figure using a straight edge and
feeler gauge.
• If the distortion exceeds the maximum
specification, replace the cylinder head. Do
not attempt to repair the cylinder head by
milling or grinding.
Maximum distortion, head gasket side of the
cylinder head
0.05 mm {0.002 in}
LOWER CYLINDER BLOCK
CLOTH
CLOTH
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MECHANICAL
01-10–26
3. Inspect the contact surface of the exhaust
manifold and the intake manifold for distortion by
measuring as shown in the figure using a straight
edge and feeler gauge.
• If the distortion on the intake manifold side
exceeds the maximum specification, replace
the cylinder head.
• If the distortion on the exhaust manifold side
exceeds the maximum specification, grind the
surface or replace the cylinder head.
Maximum distortion, manifold side
IN: 0.10 mm {0.0039 in}
EX: 0.05 mm {0.002 in}
Maximum cutting length, manifold side
IN: Cutting not authorized
EX: 0.20 mm {0.0079 in}
End Of Sie
VALVE SEAT INSPECTION/REPAIR
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1. Measure the contact width of the valve face and
the valve seat using the valve lapping compound.
• If it is not within the specification, resurface
the valve seat using the
45° valve seat cutter.
Standard valve seat contact width
1.37—1.84 mm {0.0540—0.0724 in}
Valve seat angle
45°
2. Verify that the area where the valve seat contacts
the valve face is centered.
• If the seating position is too high, correct the
valve seat using a
70° (IN) 70° (EX) valve seat
cutter and a
45° valve seat cutter.
• If the seating position is too low, correct as
follows:
—
IN: Correct the valve seat using a
20°
valve seat cutter and then using a
45°
valve cutter.
—
EX: Correct the valve seat using a
45°
valve seat cutter.
EX
IN
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SEAT CONTACT
WIDTH
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IN
70°
45°
20°
EX
70°
45°
VALVE SEAT
VALVE SEAT
COMBUSTION CHAMBER
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MECHANICAL
01-10–27
01-10
3. Inspect the valve seat for sinkage. Measure the
protruding length (dimension L) of the valve stem
using a valve of standard length.
• If it is not within the specification, replace the
cylinder head.
Standard valve seat sinkage amount
(Dimension L)
IN: 48.93—50.17 mm {1.927—1.975 in}
EX: 48.87—50.11 mm {1.925—1.972 in}
End Of Sie
VALVE, VALVE GUIDE INSPECTION
id011000506200
1. Measure the valve head margin thickness using a
vernier caliper.
• If it is less than the standard specification,
replace the valve.
Standard valve head margin thickness
IN: 1.75—1.95 mm {0.0689—0.0767 in}
EX: 1.95—2.15 mm {0.0768—0.0846 in}
2. Measure the length of the each valve using a
vernier caliper.
• If it is less than the minimum specification,
replace the valve.
Standard valve length
IN: 107.00—107.60 mm {4.2127—4.2362 in}
EX: 117.09—117.69 mm {4.6099—4.6334 in}
Minimum valve length
IN: 106.78 mm {4.2039 in}
EX: 116.87 mm {4.6012 in}.
3. Measure the valve stem diameter of each valve
using the micrometer. Measurement positions
total six and are in the X and Y directions, at three
points (A, B, and C) as shown in the figure.
• If it is less than the minimum specification,
replace the valve.
Standard valve stem diameter
IN: 5.470—5.485 mm {0.2154—0.2159 in}
EX: 5.465—5.480 mm {0.2152—0.2157 in}
Minimum valve stem diameter
IN: 5.424 mm {0.2135 in}
EX: 5.419 mm {0.2133 in}
L
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MARGIN THICKNESS
IN : 34.0 mm {1.34 in}
EX : 29.0 mm {1.14 in}
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X
Y
A
B
C
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