For 1990-2009 cars

### Removal Procedure

1. Remove the oil pan. Refer to Oil Pan Replacement.
2. Remove the oil pressure relief valve closure bolt (1).
3. Remove the oil pressure relief valve assembly (2).
4. Remove the piston (3) and the spring (4).

Warning: Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin.

Warning: To avoid eye injury, use approved safety lenses, goggles, or face shield when using buffing and cleaning equipment.

5. Clean the parts.
6. Inspect the parts.
7. Clean the thread.

### Installation Procedure

1. Install the piston (3) and the spring (4).
2. Install the oil pressure relief valve assembly (2).

Caution: Refer to Fastener Caution in the Preface section.

3. Install the oil pressure relief valve closure bolt (1) and tighten to 21 N·m (16 lb ft).
4. Install the oil pan. Refer to Oil Pan Replacement.