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.
1998 Volvo S70 T-5, AutomaticFACTORY OEM SERVICE PROCEDURE
Mechanical Inspection: Compression
Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions.
WARNING:
Do not use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine oiling system.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| C70, S70 & V70 | |||
| Non-Turbo | 10.3:1 | ||
| High Pressure Turbo | 8.5:1 | ||
| Low Pressure Turbo | 9.0:1 | ||
| S90 & V90 | 10.7:1 | ||
| Compression Pressure (Minimum) | |||
| C70, S70 & V70 | |||
| Non-Turbo | 184-219 psi (13-15 kg/cm2 ) | ||
| Turbo | 156-184 psi (11-13 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.