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.
1987 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Engine Compression
Check compression pressure with engine at normal operating temperature, spark plugs removed, throttle valve wide open and engine at cranking speed. Crank engine until maximum pressure is reached at each cylinder.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Normal Compression Pressure | |||
| 323 | 192 psi (13.5 kg/cm2 ) | ||
| 626 | |||
| Non-Turbo | 164 psi (11.5 kg/cm2 ) | ||
| Turbo | 156 psi (11.0 kg/cm2 ) | ||
| Min. Compression Pressure | |||
| 323 | 135 psi (9.5 kg/cm2 ) | ||
| 626 | |||
| Non-Turbo | 115 psi (8.1 kg/cm2 ) | ||
| Turbo | 110 psi (7.7 kg/cm2 ) | ||
| Max. Variation | 28 psi (2.0 kg/cm2 ) | ||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.