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.
1985 Mazda 626 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Compression
- Fully warm-up engine. Remove nozzle holders from all cylinders. Attach adapter set (49 1456 010) and compression gauge capable of measuring more than 427 psi (30 kg/cm2 ) on cylinder to be measured. Disconnect wiring of fuel cut solenoid. Measure compression by cranking engine.
- Check speed of engine, if compression does not reach standard pressure. If speed is normal, but compression is lower than standard value, disassemble and repair engine. If compression is more than standard value, but compression difference between each cylinder is more than 43 psi (3 kg/cm2 ), disassembling and repairing are required.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression | ||
| Standard | 427 psi (30 kg/cm2 ) @ 200 RPM | |
| Limit | 384 psi (27 kg/cm2 ) @ 200 RPM | |
| Variation | 43 psi (3 kg/cm2 ) | |
Factory Service Tools
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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.