Oil stains appear at the gap between the cylinder head and the valve chamber cover, and they spread around the cover edge and the bolt hole.

Persistent oil stains or signs of moisture can be found around the cover gasket, and they reappear shortly after cleaning.

The oil level decreases, accompanied by oil leakage signs. If the oil level in the tank decreases without obvious leakage points, hidden leakage may have occurred.

After the engine is cleaned, obvious oil leakage points can be found again, and this symptom often occurs after driving at high temperatures.

There is a feeling of grease or oil film if the cover or bolt area is touched, indicating poor sealing.

Common key points for troubleshooting a valve chamber cover with oil leakage:

Visual inspection: After cleaning, check whether there are oil stains or oil spreading paths around the cover edge and the bolt hole.

Bolt torque and tightening sequence: Check if the torque is in line with the manufacturer recommendation, ensure gradual tightening in the correct sequence, and avoid concentration of stress on a single point.

Gasket status: Check for signs of cracking, hardening, deformation, and detachment of the gasket.

Cleanliness of the cover plate surface and the contact surface: Ensure that the contact surface between the cylinder cover and the cover plate is clean, free of residual pollutants, and free of protrusions.

Pressure and oil circuit: In the event of suspected abnormal oil pressure, check whether the oil pressure is normal and make sure the oil circuit is smooth.

Temperature difference observation: After warm-up of the car, observe the oil leakage area again, as leakage points can be exposed after thermal expansion and contraction.

vika BMW N20 valve chamber cover:

1. An internal plastic frame is added to vika BMW N20 valve chamber cover, preventing it from deforming and ensuring satisfactory sealing effect.

2. The vika BMB N20 valve chamber cover gasket is made of ACM material, which can operate normally in the temperature range of -30℃ to 150℃, thus guaranteeing stable use and leading to a longer service life.

3. The nuts are installed on the product using an original process, ensuring high stability and precise hole position.