A valve cover is installed on the valve cover to protect the valve and the valve spring and ensure their normal operation.
Gaskets are usually installed between the valve cover and the cylinder head to ensure sealing performance and balance different thermal expansion coefficients.
The engine bonnet usually has a plurality of bolt holes for firmly mounting it on the cylinder head.
Support camshaft and valve mechanism: Engine bonnet provides the function of installing and supporting camshaft and valve mechanism. Their stable and accurate installation is very important for the normal operation of the engine.
Management of valve clearance: Engine bonnet usually has an accurately designed opening, which is convenient for checking and adjusting the valve clearance to ensure the good operation of the valve mechanism."

Notes	Year	Make	Model	Trim	Engine
	2018	BMW	320i	Base Sedan 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2018	BMW	320i xDrive	Base Sedan 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2018	BMW	X4	xDrive28i Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2018	BMW	X5	xDrive40e Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 PLUG-IN HYBRID EV-GAS (PHEV) DOHC Turbocharged
	2017	BMW	320i	Base Sedan 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2017	BMW	320i xDrive	Base Sedan 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2017	BMW	X3	sDrive28i Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2017	BMW	X3	xDrive28i Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
Engine Designation: N20B20A	2017	BMW	X4	xDrive28i Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
	2017	BMW	X5	xDrive40e Sport Utility 4-Door	2.0L 1997CC 122Cu. In. l4 PLUG-IN HYBRID EV-GAS (PHEV) DOHC Turbocharged
Engine Designation: N20B20A	2016	BMW	228i	Base Convertible 2-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
Engine Designation: N20B20A	2016	BMW	228i	Base Coupe 2-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
Engine Designation: N20B20A	2016	BMW	228i xDrive	Base Convertible 2-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged
Engine Designation: N20B20A	2016	BMW	228i xDrive	Base Coupe 2-Door	2.0L 1997CC 122Cu. In. l4 GAS DOHC Turbocharged

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