Engine Valve/Rocker Cover Assembly

This OE-grade top cover seals the cylinder head, keeps oil where it belongs, and manages crankcase ventilation. Built with heat-stable materials and precise baffles, it protects camshafts and timing components from dirt while channeling oil return flow. A molded gasket and tube seals prevent leaks around the perimeter and spark plug wells, keeping ignition parts dry and your engine bay clean .

Why this part is needed ️

It maintains oil containment, supports PCV airflow, reduces noise, and provides a rigid mount for ignition coils. A tight seal helps preserve oil pressure and extends gasket and chain life.

How it works ⚙️

The cover closes the head, integrating baffles and PCV passages to separate oil mist from blow-by gases. Even clamping and a formed gasket create a uniform seal through heat cycles, preventing seepage and vacuum leaks.

What happens if it’s broken ⚠️

Cracks or warpage cause oil leaks, burning smells, and smoke; oil in plug tubes triggers misfires; unmetered air upsets idle; sludge forms from poor ventilation; prolonged loss leads to wear and possible catalyst damage.

Tech notes ️

Replace if cracked, warped, or PCV is integrated and sticking. Clean mating surfaces, install a fresh gasket, and torque fasteners evenly in sequence. Inspect coil boots and plugs after any leak .

Compatibility

• Q60/G Coupe
• Q60/G Convertible
• Q40/G Sedan
• Q70/M
• Qx50/Ex
• Qx70/Fx
• Q50
• M
• G37 Sedan
• Q70(201802-)Lam