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 SPECIFICATIONSCRANKSHAFT
1999 Mazda MX-5 Miata L4-1.8L DOHC
Crankshaft
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Crankshaft
| Crankshaft Runout | 0.03 Max. | |
| Main Journal Diameter | ||
| Standard | 49.938 - 49.956 | |
| 0.25 Undersize | 49.688 - 49.706 | |
| 0.50 Undersize | 49.438 - 49.456 | |
| 0.75 Undersize | 49.188 - 49.206 | |
| Out-Of-Round | 0.05 | |
| Crank Pin Diameter | ||
| Standard | 44.940 - 44.956 | |
| 0.25 Undersize | 44.690 - 44.706 | |
| 0.50 Undersize | 44.440 - 44.456 | |
| 0.75 Undersize | 44.190 - 44.206 | |
| Out-Of-Round | 0.05 | |
| Main Journal Oil Clearance | ||
| Standard | 0.018 - 0.036 | |
| Minimum | 0.10 | |
| Crankshaft End Play | ||
| Standard | 0.080 - 0.282 | |
| Minimum | 0.30 |
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.