Valve Spring: Service and Repair

11 34 715 - Replacing all valve springs (N62)





Special tools required:
- 11 0 346 11 0 340 Accessories
- 11 9 470 11 9 470 Support

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head Disassembling and Assembling Cylinder Head (N62/N62TU).





Remove bearing bracket (1) with inlet camshaft and stow in special tool 11 9 470 11 9 470 Support. The procedure is described in the section Removing and installing inlet camshaft.





Remove exhaust camshaft.





Align special tool 11 0 346 11 0 340 Accessories in direction of valve shaft.





Press down valve spring on spring cap, top, and remove valve keys.





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.

1) - Valve springs of inlet valves
2) - Valve springs of exhaust valves





Important!
Incorrect installation possible.

Incorrect installation will result in valve spring breakage.

The color coding (1) is normally located on the lower end of the 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.





Arrangement:

1) - Valve
2) - Valve stem seal with spring plate, bottom
3) - Valve spring
4) - Top plate spring
5) - Valve tapers