Mazda Engine LF, L3. Manual — part 9
MECHANICAL
01–10–19
01–10
4. Insert the piston ring into the cylinder by hand and
use the piston to push it to the bottom of the ring
travel.
5. Measure each piston ring end gap with a feeler
gauge.
• If it exceeds the specification, replace the
piston, piston pin, piston ring and connecting
rod as a single unit.
Piston end gap (Standard)
Top: 0.16—0.31 mm {0.0063—0.0122 in}
Second: 0.33—0.48 mm {0.0130—0.0189 in}
Oil (rail): 0.20—0.70 mm {0.0079—0.0275 in}
Piston end gap (Maximum)
1.0 mm {0.0393 in}
End Of Sie
CRANKSHAFT INSPECTION
E5U011011301E01
1. Install the main bearing cap. (See 01–10–28 Main Bearing Cap Assembly Note.)
2. Measure the crankshaft end play.
• If it exceeds the specification, replace the
thrust bearing or crankshaft so that the
specified end play is obtained.
Crankshaft end play (Standard)
0.22—0.45 mm {0.0087—0.0177 in}
Crankshaft end play (Maximum)
0.55 mm {0.0216 in}
3. Remove the main bearing cap. (See 01–10–11
Main Bearing Cap Disassembly Note.)
4. Measure the crankshaft runout.
• If it exceeds the specification, replace the
crankshaft.
Crankshaft runout (Maximum)
0.05 mm {0.0019 in}
5. Measure the journal diameter in X and Y
directions at the two points (A and B) as indicated
in the figure.
• If it exceeds the specification, replace the
crankshaft or grind the journal and install the
undersize bearing.
Main journal bearing size
STD: 51.980—52.000 mm {2.0464—2.0472
in}
US0.25: 51.730—51.750 mm {2.0366—2.0373
in}
Main journal out of round (Maximum)
0.05 mm {0.0019 in}
Crank pin journal diameter [LF]
STD: 46.980—47.000 mm {1.8497—1.8503
in}
US0.25: 46.730—46.750 mm {1.8398—1.8405
in}
Crank pin journal diameter [L3]
STD: 49.980—50.000 mm {1.9677—1.9685 in}
US0.25: 49.730—49.750 mm {1.9579—1.9586 in}
Crank pin out of round (Maximum)
0.05 mm {0.0019 in}
PISTON RING
B3E0110E082
B3E0110E083
AME2224E311
A
B
X
Y
B3E0110E085
MECHANICAL
01–10–20
6. Install the main bearing caps and crankshaft.
7. Position a plastigage atop the journals in the axial direction.
8. Install the main bearing caps and cylinder block. (See 01–10–28 Main Bearing Cap Assembly Note.)
9. Remove the main bearing caps. (See 01–10–11 Main Bearing Cap Disassembly Note.)
10. Measure the main journal oil clearance.
• If it exceeds the specification, replace the
main bearing using the main bearing
selection table or grind the main journal and
install the oversize bearings so that the
specified oil clearance is obtained.
Main journal oil clearance (Standard)
0.019—0.035 mm {0.0007—0.0013 in}
Main journal oil clearance (Maximum)
0.10 mm {0.0039 in}
Main bearing size
STD: 2.506—2.509 mm {0.0987—0.0988 in}
OS0.25: 2.628—2.634 mm {0.1034—0.1037 in}
End Of Sie
CONNECTING ROD INSPECTION
E5U011011211E01
Caution
• The piston and connecting rod cannot be disassembled.
• When replacing the piston, piston pin, piston ring and connecting rod, replace them together as a
single unit.
1. Install the connecting rod cap. (See 01–10–29 Connecting Rod Cap Assembly Note.)
2. Measure the connecting rod large end side
clearance.
• If it exceeds the specification, replace the
piston, piston pin, piston ring and connecting
rod as a single unit.
Connecting rod side clearance (Standard)
0.14—0.36 mm {0.0056—0.0141 in}
Connecting rod side clearance (Maximum)
0.435 mm {0.0172 in}
3. Remove the connecting rod cap.
4. Position plastigage atop the journals in the axial
direction.
5. Install the connecting rod bearing and connecting rod cap. (See 01–10–29 Connecting Rod Cap Assembly
Note.)
6. Remove the connecting rod cap.
7. Measure the connecting rod oil clearance.
• If it exceeds the specification, replace the
connecting rod bearing or grind the crank pin
and use oversize bearings so that the
specified clearance is obtained.
Connecting rod bearing oil clearance
(Standard)
0.026—0.052 mm {0.0011—0.0020 in}
Connecting rod bearing oil clearance
(Maximum)
0.1 mm {0.0039 in}
Connecting rod bearing size [LF]
STD: 1.498—1.504 mm {0.0589—0.0592 in}
OS0.25: 1.623—1.629 mm {0.0639—0.0641 in}
Connecting rod bearing size [L3]
STD: 1.496—1.502 mm {0.0589—0.0591 in}
OS0.25: 1.621—1.627 mm {0.0639—0.0641 in}
B3E0110E086
B3E0110E087
B3E0110W128
MECHANICAL
01–10–21
01–10
End Of Sie
BOLT INSPECTION
E5U011010135E01
1. Measure the length of each bolt.
• If it exceeds the specification, replace the bolt.
Bolt length (mm {in})
Cylinder head bolt (With washer)
Standard: 149.2—149.8 {5.87—5.90}
Maximum: 150.5 {5.91}
Cylinder head bolt (Without washer)
Standard: 145.2—145.8 {5.72—5.74}
Maximum: 146.5 {5.77}
Connecting rod bolt
Standard: 44.7—45.3 {1.75—1.78}
Maximum: 46.0 {1.81}
Main bearing cap bolt (Plastic region
tightening bolt only)
Standard: 110.0—110.6 {4.33—4.35}
Maximum: 111.3 {4.38}
End Of Sie
VARIABLE VALVE TIMING ACTUATOR INSPECTION [WITH VARIABLE VALVE TIMING MECHANISM]
E5U011012490E01
Caution
• Variable valve timing actuator cannot be disassembled because it is a precision unit.
1. Confirm that the groove of the rotor and notch of
the cover at the variable valve timing actuator are
aligned and fixed.
• If the notch and the bump are not aligned,
rotate the rotor toward the valve timing retard
position by hand until they are in place.
• If the rotor and cover are not fixed even
though their notch and groove are aligned,
replace the variable valve timing actuator.
End Of Sie
OIL CONTROL VALVE (OCV) INSPECTION [WITH VARIABLE VALVE TIMING MECHANISM]
E5U011014420E01
Coil Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the oil control valve (OCV) connector.
3. Measure the resistance between terminals A and B using an ohmmeter.
• If not as specified, replace the oil control valve (OCV).
Specification
6.9—7.9 ohms [20
°C {68 °F}]
4. Connect the oil control valve (OCV) connector.
L
B3E0110E088
COVER
NOTCH
ROTOR
B3E0110E089
A
B
B3E0110W151
MECHANICAL
01–10–22
Spool Valve Operation Inspection
1. Disconnect the negative battery cable.
2. Remove the oil control valve (OCV).
3. Verify that the spool valve in the oil control valve
(OCV) is in the maximum valve timing retard
position as indicated in the figure.
• If it exceeds the specification, replace the oil
control valve (OCV).
4. Verify that the battery is fully charged.
• If it is less than specification, recharge the
battery.
5. Apply battery positive voltage between the oil
control valve (OCV) terminals and verify that the
spool valve operates and moves to the maximum
valve timing advance position.
• If it exceeds the specification, replace the oil
control valve (OCV).
Note
• When applying battery positive voltage
between the oil control valve (OCV)
terminals, the connection can be either of
the following:
— Positive battery cable to terminal A,
negative battery cable to terminal B
— Positive battery cable to terminal B, negative battery cable to terminal A
6. Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing retard
position.
• If it exceed the specification, replace the oil control valve (OCV).
End Of Sie
VALVE CLEARANCE INSPECTION
E5U011012111E03
1. Measure the valve clearance as follows.
(1) Turn the crankshaft clockwise so that the No.1 piston is at TDC of the compression stroke.
(2) Measure the valve clearance at A in the
figure.
• If the valve clearance exceeds the
standard, replace the tappet. (See 01–
10–23 VALVE CLEARANCE
ADJUSTMENT.)
Note
• Make sure to note the measured values for
choosing the suitable replacement tappets.
Valve clearance [Engine cold]
IN: 0.22—0.28 mm {0.0087—0.0110 in}
EX: 0.27—0.33 mm {0.0106—0.0130 in}
(3) Turn the crankshaft 360
° clockwise so that the No.4 piston is at TDC of the compression stroke.
(4) Measure the valve clearance at B in the figure.
• If the valve clearance exceeds the standard, replace the tappet. (See 01–10–23 VALVE CLEARANCE
ADJUSTMENT.)
Note
• Make sure to note the measured values for choosing the suitable replacement tappets.
Valve clearance [Engine cold]
IN: 0.22—0.28 mm {0.0087—0.0110 in}
EX: 0.27—0.33 mm {0.0106—0.0130 in}
SPOOL VALVE
(MAXIMUM VALVE TIMING RETARD POSITION
B3E0110E090
VALVE TIMING
ADVANCE
VALVE TIMING
RETARD
SPOOL VALVE
(MAXIMUM VALVE TIMING ADVANCE POSITION)
B3E0110E091
A
A
A
A
B
B
B
B
EX
IN
B3E0110E092
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