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 DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYCRANKSHAFT MAIN BEARING
2009 Mazda B2300 L4-2.3L
Crankshaft Main Bearing
2009 Mazda B2300 L4-2.3LSECTION Crankshaft Main Bearing
Main bearing
Main bearing size
STD: 2.506-2.509 mm (0.0987-0.0988 in)
OSO.25: 2.628-2.634 mm (0.1034-0.1037 in)
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)
Standard: 110.0-110.6 (4.33-4.35)
Maximum: 111.3 (4.38)
(1) 44 46 N-m (4.5-4.6 kgf-m, 32.5-33.9 ft-lbt)
(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-lbt)
(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°
Crankshaft
Crankshaft end play (Standard) 0.22-0.45 mm (0.0087-0.0177 in)
Crankshaft end play (Maximum) 0.55 mm (0.0216 in)
Crankshaft runout (Maximum) H 0.05 mm (0.0019 in)
Main journal bearing size
STD: 51.980-52.000 mm (2.0464-2.0472 in)
USO.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)
USO.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)
USO.25: 49.730-49.750 mm (1.9579-1.9586 in)
Crank pin out of round
(Maximum) (0.05 mm (0.0019 in)
Main journal oil clearance
(Standard) 0.019-0.035 mm (0.0007-0.0013 in)
(Maximum) 0.10 mm (0.0039 in)
Crankshaft Pulley
Tighten the crankshaft pulley lock bolt in the order shown following two steps using the SST (49 D032 316).
(1) Tighten 96-104 N-m (9.8-10.6 kgf-m, 70.9-76.7 ft-lbf)
(2) Tighten 87°-93°
Main bearing size
STD: 2.506-2.509 mm (0.0987-0.0988 in)
OSO.25: 2.628-2.634 mm (0.1034-0.1037 in)
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)
Standard: 110.0-110.6 (4.33-4.35)
Maximum: 111.3 (4.38)
(1) 44 46 N-m (4.5-4.6 kgf-m, 32.5-33.9 ft-lbt)
(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-lbt)
(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°
Crankshaft
Crankshaft end play (Standard) 0.22-0.45 mm (0.0087-0.0177 in)
Crankshaft end play (Maximum) 0.55 mm (0.0216 in)
Crankshaft runout (Maximum) H 0.05 mm (0.0019 in)
Main journal bearing size
STD: 51.980-52.000 mm (2.0464-2.0472 in)
USO.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)
USO.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)
USO.25: 49.730-49.750 mm (1.9579-1.9586 in)
Crank pin out of round
(Maximum) (0.05 mm (0.0019 in)
Main journal oil clearance
(Standard) 0.019-0.035 mm (0.0007-0.0013 in)
(Maximum) 0.10 mm (0.0039 in)
Crankshaft Pulley
Tighten the crankshaft pulley lock bolt in the order shown following two steps using the SST (49 D032 316).
(1) Tighten 96-104 N-m (9.8-10.6 kgf-m, 70.9-76.7 ft-lbf)
(2) Tighten 87°-93°
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.