The EF7 oil pump O-ring has the vital task of sealing the oil outlet from the pump and its entry into the main passages of the cylinder block.
Since this part is directly exposed to high oil pressure and extreme heat of the engine body, Madsuran has used a material with high thermal stability in its production to prevent drying and leakage in the long term.
The dimensional accuracy of this O-ring prevents pressure loss in the main circuit and ensures perfect lubrication of sensitive parts such as camshafts and bearings.

Technical note
Failure or deformation of this O-ring causes oil pressure loss in the main circuit. It is strongly recommended to replace this part every time the oil pump is opened.

Identifying the location of an oil leak:
Symptoms:
Internal leak or loss of engine oil pressure
Oil warning light coming on while driving
Late oil pressure build-up after a cold start
Dumpty or knocking noise from the lower part of the engine