Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA2009B2300 L4-2.3LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIROVERHAULBALANCER UNIT ASSEMBLY NOTE
2009 Mazda B2300 L4-2.3L
Balancer Unit Assembly Note
2009 Mazda B2300 L4-2.3LSECTION Balancer Unit Assembly Note
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.
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.
Adjustment shim selection table
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.
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.
Adjustment shim selection table
Adjustment Shim Selection Table:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.