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 MANUALSMAZDA1999MX-5 MIATA L4-1.8L DOHCREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYSYSTEM SPECIFICATIONSMAIN BEARING SIZE CODES
1999 Mazda MX-5 Miata L4-1.8L DOHC
Main Bearing Size Codes
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Main Bearing Size Codes
CLEARANCE SPECIFICATIONS
Main Bearing Oil Clearance
Standard 0.018-0.036 mm (0.0008-0.0014 in)
Maximum 0.10 mm (0.0039 in)
Main Bearing Thickness
Standard 2.007-2.025 mm (0.0791-0.0797 in)
0.25 mm Undersize 2.133-2.137 mm (0.0840-0.0841 in)
0.50 mm Undersize 2.258-2.262 mm (0.0889-0.0890 in)
0.75 mm Undersize 2.383-2.387 mm (0.0939-0.0939 in)
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.