11 34 552 Removing And Installing/Replacing All Valves (N62)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head. See 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (N62/N62TU) .

Remove valve springs. See 11 34 715 REPLACING ALL VALVE SPRINGS (N62) .

Remove valve stem seals. See 11 34 560 REPLACING ALL VALVE STEM SEALS (N62) .

Remove valves from cylinder head.

Installation:

If necessary, check valve guide for wear. See 11 12 595 CHECKING A VALVE GUIDE FOR WEAR (N62) .

If necessary, remachine valve seat. See 11 12 527 REMACHINING A VALVE SEAT - CYLINDER HEAD DISASSEMBLED (N62) .

IMPORTANT: Incorrect installation possible.
Valve springs of exhaust and inlet camshafts are different. Incorrect installation will result in engine damage.

NOTE: Valve springs for exhaust valves are approx. 4 mm longer.

Valve springs of inlet valves
Valve springs of exhaust valves

Fig 1: Identifying Valve Springs Of Inlet And Exhaust Valves
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Incorrect installation possible.
Incorrect installation will result in valve spring breakage.
Color marking (1) is normally on lower end of valve spring.
Only the diameter is decisive for the correct installation of the valve springs.
Install valve spring so that larger diameter points to spring plate at bottom.

Fig 2: Identifying Valve Spring Diameter And Color Marking

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

Valve
Valve stem seal with spring plate, bottom
Valve spring
Top plate spring
Valve tapers

Fig 3: Identifying Valve Assembly Components
Courtesy of BMW OF NORTH AMERICA, INC.