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.
2004 Mazda 3 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Piston, Engine
Piston
Piston Diameter
(Standard) 87.465-87.495 mm (3.4435-3.4446 in)
Piston-to-cylinder clearance
(Standard) 0.025-0.045 mm (0.0010-0.0017 in)
(Maximum) 0.11 mm (0.0043 in)
Piston ring-to-ring groove clearance (Standard)
Top: 0.03-0.08 mm (0.0012-0.0031 in)
Second: 0.03-0.07 mm (0.0012-0.0027 in)
Oil: 0.03-0.07 mm (0.0012-0.0027 in)
Piston ring-to-ring groove clearance (Maximum)
Top: 0.17 mm (0.0067 in)
Second, Oil: 0.15 mm (0.0059 in)
Piston end gap (Standard)
Top: 0.16-0.31 mm (0.0063-0.0122 in)
Second: 0.33-0.48 mm (0.01 30-0.0189 in)
Oil (rail): 0.20-0.70 mm (0.0079--0.0275 in)
Piston end gap (Maximum)
All 1.0 mm (0.0393 in)
Piston Diameter
(Standard) 87.465-87.495 mm (3.4435-3.4446 in)
Piston-to-cylinder clearance
(Standard) 0.025-0.045 mm (0.0010-0.0017 in)
(Maximum) 0.11 mm (0.0043 in)
Piston ring-to-ring groove clearance (Standard)
Top: 0.03-0.08 mm (0.0012-0.0031 in)
Second: 0.03-0.07 mm (0.0012-0.0027 in)
Oil: 0.03-0.07 mm (0.0012-0.0027 in)
Piston ring-to-ring groove clearance (Maximum)
Top: 0.17 mm (0.0067 in)
Second, Oil: 0.15 mm (0.0059 in)
Piston end gap (Standard)
Top: 0.16-0.31 mm (0.0063-0.0122 in)
Second: 0.33-0.48 mm (0.01 30-0.0189 in)
Oil (rail): 0.20-0.70 mm (0.0079--0.0275 in)
Piston end gap (Maximum)
All 1.0 mm (0.0393 in)
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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