11 34 715 Replacing all valve springs (N52K)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

11 0 346
11 4 480
11 9 000
11 9 017

Necessary preliminary tasks:

Remove cylinder head, see 11 12 100 Removing and installing cylinder head (N52K) .
Remove exhaust camshaft, see 11 31 028 Removing and installing/replacing exhaust camshaft (N52K) .
Remove intermediate lever, see 11 37 010 Removing and installing/replacing intermediate levers (N52K) .
Remove inlet camshaft, see 11 31 025 Removing and installing/replacing inlet camshaft (N52K)
Remove cam followers, see 11 33 050 Removing and installing/replacing all cam followers (N52K)

Place cylinder head on special tool 11 9 000 .

Press down inlet valves with special tool 11 9 017 .

Press down exhaust valves with special tool 11 0 346 .

Fig 1: Special Tool (11 9 017) And (11 9 000)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove valve cotters with a magnet.

Remove valve spring with spring plates.

If the individual components are to be reused, they must be placed in neat order in special tool 11 4 480 .

Fig 2: Removing Valve Cotters With Magnet

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Incorrect installation possible.
Incorrect installation will result in valve spring breakage.
Risk of mixing up the valve springs for the inlet and exhaust valves.

The valve spring is color-coded (1) at the lower end.

Install the valve spring so that the larger diameter points to the lower spring plate.

Fig 3: Valve Spring Color-Coded

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

Valve
Valve stem seal with lower spring plate
Valve spring
Upper spring plate
Valve tapers

Fig 4: Upper Spring Plate, Valve Tapers And Spring

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME; if necessary, readjust uniform mixture distribution.