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.
Rocker Arm Oil Control System Description: Notes
The high output 1.8L RPO - LNK engine has a high speed cam system that increases engine output between 6,000-8,200 RPM. The increase in power is possible because valve lift is significantly increased at engine speeds above 6,000 RPM. A second camshaft lobe with a high lift profile is cast into each camshaft, alongside the low/medium speed lobes. In order to use the high speed cam only when desired, the engine utilizes a rocker arm oil control system. The system uses unique rocker arms that are hydraulically operated and electronically controlled.
| Callout | Component Name |
|---|---|
| 1 | Intake/Exhaust Valve Rocker Arms |
| 2 | Rocker Arm Oil Control Solenoid Housing |
| 3 | Rocker Arm Oil Pressure Switch |
| 4 | Rocker Arm Oil Control Solenoid Valve |
| 5 | Gasket |
| 6 | Rocker Arm Oil Filter |
| 7 | Camshaft Position (CMP) Actuator Solenoid Valve |
| 8 | Camshaft Position (CMP) Actuator Oil Filter |
| 9 | Cylinder Head |
| 10 | Intake Valve Rocker Arm Shaft |
| 11 | Exhaust Valve Rocker Arm Shaft |
The rocker arms (1) ride on rocker arm shafts (10, 11) that supply engine oil, that is under pressure, to the rocker arms. The flow of engine oil to the rocker arms and shafts is controlled by the rocker arm oil control solenoid valve (4). A rocker arm oil pressure switch (3) signals the PCM when oil pressure is detected. A screen type oil filter (6) is located in the oil supply passage to the rocker arm shafts. The rocker arm oil control solenoid (4) and the oil pressure switch (3) are located in the oil control housing (2).
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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.