Mazda Engine LF, L3. Manual — part 11
MECHANICAL
01–10–27
01–10
CYLINDER BLOCK (I) ASSEMBLY
E5U011002000E08
1. Assemble in the order indicated in the table.
.
OIL
OIL
OIL
OIL
OIL
4
3
3
2
1
SST
5
7
8
9
6
12
11
10
L3
L3
N·m {kgf·m, ft·lbf}
26—32 {2.7—3.2,
19.2—23.6}+80
°
—100
°
25+44—46
{2.6+4.5—4.7,
18.4+32.5—33.9}
2.9—4.9 N·m
{30—40 kgf·cm,
25.67—43.4 in·lbf}
ELASTIC REGION TIGHTENING BOLT
(BOLT STEM LENGTH 104 mm)
3—7 N·m {30.6—71.3 kgf·cm,26.6—61.9 in·lbf}
+23—27 {2.4—2.7, 17—19.9}
+38—42 {3.9—4.2, 28.1—30.9}
Loosen all the bolts
+3—7 N·m {30.6—71.3 kgf·cm,26.6—61.9 in·lbf}
+18—22 {1.9—2.2, 13.3—16.2}
+87.5
°
—92.5
°
PLASTIC REGION TIGHTENING
BOLT
(BOLT STEM LENGTH 110 mm)
44—46 {4.5—4.6, 32.5—33.9}
+175
°
—185
°
SST
SST
SST
E5U110ZE7S03
1
Oil jet valve
2
Upper main bearing, thrust bearing
3
Crankshaft
4
Lower main bearing, thrust bearing
5
Main bearing cap
(See 01–10–28 Main Bearing Cap Assembly Note)
6
Piston ring
(See 01–10–28 Piston Ring Assembly Note)
7
Upper connecting rod bearing
(See 01–10–29 Connecting Rod Bearing Assembly
Note)
8
Connecting rod, piston assembly
(See 01–10–28 Piston Assembly Note)
9
Lower connecting rod bearing
(See 01–10–29 Connecting Rod Bearing Assembly
Note)
10
Connecting rod cap
(See 01–10–29 Connecting Rod Cap Assembly
Note)
11
Adjustment shim
12
Balancer unit
(See 01–10–29 Balancer Unit Assembly Note)
MECHANICAL
01–10–28
Main Bearing Cap Assembly Note
1. Install the main bearing caps in the order
indicated in the figure.
2. Tighten the main bearing cap bolts using the SST
(49 D032 316).
Tightening torque
Plastic region tightening bolt (Bolt stem
length 110 mm)
(1) 44—46 N·m {4.5—4.6 kgf·m, 32.5—33.9
ft·lbf}
(2) 175
°—185°
Elastic region tightening bolt (Bolt stem
length 104 mm)
(1) Apply engine oil to all bolts.
(2) 3—7 N·m {30.6—71.3 kgf·cm, 26.6—61.9 in·lbf}
(3) 23—27 N·m {2.4—2.7 kgf·m, 17—19.9 ft·lbt}
(4) 38—42 N·m {3.9—4.2 kgf·m, 28.1—30.9 ft·lbt}
(5) Loosen all the bolts. (no remaining torque.)
(6) 3—7 N·m {30.6—71.3 kgf·cm, 26.6—61.9 in·lbt}
(7) 18—22 N·m {1.9—2.2 kgf·m, 13.3—16.2 ft·lbt}
(8) 87.5
°—92.5°
Piston Ring Assembly Note
1. Install the two oil control ring segments and spacer.
2. Verify that the second ring is installed with scraper face side downward.
3. Verify that the top ring is installed with scraper
face side inner of upper.
Piston Assembly Note
1. Position the end gap of each ring as indicated in
the figure.
9
8
7
5
4
3
1
2
10
6
B3E0110E105
LF
L3
C3U0110E056
30
°
TOP RING
UPPER OIL
RING RAIL
LOWER OIL
RING RAIL
OIL RING SPACER
AND SECOND RING
30
°
B3E0110E107
MECHANICAL
01–10–29
01–10
2. Insert the piston and connecting rod into the
cylinder with the arrow mark to front of the engine.
Connecting Rod Bearing Assembly Note
1. Install the connecting rod bearing to the
connecting rod and connecting rod caps, as
shown in the figure.
Connecting Rod Cap Assembly Note
Caution
• When assembling the connecting rod caps, align the broken, rough faces of the connecting rods
and connecting rod caps.
1. Tighten the connecting rod bolts in two steps using the SST (49 D032 316).
Tightening torque
(1) 26—32 N·m
{2.7—3.2 kgf·m, 19.2—23.6 ft·lbf}
(2) 80
°—100°
Balancer Unit Assembly Note
1. Confirm by visual inspection that there is no damage to the balancer unit gear and verify that the shaft turns
smoothly.
• If there is any damage or malfunction, replace the balancer unit.
Caution
• Due to the precision interior construction of the balancer unit, it cannot be disassembled.
2. Install the SST as shown in the figure.
3. Turn the crankshaft clockwise the crankshaft is in
the No.1 cylinder TDC position (until the balance
weight is attached to the SST).
4. Install the adjustment shim to the seat face of the
balancer unit.
B3E0110E108
CONNECTING ROD
BEARING
2.3
—
2.7 mm {0.091
—
0.106 in}
B3E0110E109
303-507
D3U110ZE4007
MECHANICAL
01–10–30
5. With the balancer unit marks at the exact top
center, assemble the unit to the cylinder block.
6. Set the SST as shown, then measure the gear
backlash using a dial gauge.
Note
• For an accurate measurement of gear
backlash, insert a screwdriver into the
crankshaft No. 1 balance weight area and
set both the rotation and the thrust direction
with the screwdriver, using a prying action,
as shown in the figure.
• If the backlash exceeds the specified range, remeasure the backlash and, using the adjustment shim
selection table, select the proper shim, according to the following procedure.
Caution
• When measuring the backlash, rotate the crankshaft one full rotation and verify that it is within the
specified range at all of the following six positions: 10
°, 30°, 100°, 190°, 210°, 280° ATDC.
Value range
0.005—0.101 mm {0.00019—0.0039 in}
(1) Using master adjustment shim (No.50), assemble the balancer unit to the cylinder block, then measure the
backlash.
(2) Select the proper adjustment shim according to the measured value.
(3) Install the selected adjustment shim to the balancer unit, then assemble the balancer unit to the cylinder
block.
MARK
B3E0110E111
DRIVEN GEAR SHAFT CENTER
DIAL GAUGE
49 G011 201
41.4 mm
{1.629 in}
B3E0110E112
B3E0110E113
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