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 MANUALSMAZDA1991PROTEGE DX, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL1.8L 4-CYLENGINE SPECIFICATIONSCRANKSHAFT, MAIN & CONNECTING ROD BEARINGS SPECIFICATIONS
1991 Mazda Protege DX, Standard
Crankshaft, Main & Connecting Rod Bearings Specifications
1991 Mazda Protege DX, StandardSECTION Crankshaft, Main & Connecting Rod Bearings Specifications
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS
| Application | In. (mm) | ||
|---|---|---|---|
| Crankshaft | |||
| End Play | |||
| Standard | .0031-.0111 (.079-.282) | ||
| Maximum Wear Limit | .012 (.30) | ||
| Maximum Runout | .0016 (.040) | ||
| Main Bearings | |||
| Journal Diameter | 1.9660-1.9668 (49.938-49.956) | ||
| Journal Out-Of-Round & Taper | .002 (.05) | ||
| Oil Clearance | |||
| Standard | .0009-.0017 (.023-.042) | ||
| Maximum Wear Limit | .0039 (.100) | ||
| Connecting Rod Bearings | |||
| Journal Diameter | |||
| Standard | 1.7693-1.7699 (44.940-44.956) | ||
| Minimum | 1.7680 (44.908) | ||
| Journal Out-Of-Round & Taper | .002 (.05) | ||
| Oil Clearance | |||
| Standard | .0011-.0027 (.028-.068) | ||
| Maximum Wear Limit | .0039 (.10) | ||
RENDER: 1.0x
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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.