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