Valve Gear, Overview

Valve gear, overview





1. 5 Nm plus additional 90°(1/4) turn
^ Always replace
2. Housing for camshaft adjustment solenoid valve
3. Gasket
^ Always replace
4. Valve stem seal
5. Valve spring
6. Valve spring plate
7. Valve keepers
8. Hydraulic lifters Pressed into roller-type rocker finger Non-destructive removal not possible
9. Roller-type rocker finger
^ With hydraulic tappet -item 8 -
10. Dowel sleeve
^ 2x
11. Double bearing cap
12. 5 Nm plus an additional 90° (1/4) turn
^ Always replace
13. Oil deflector
^ At right cylinder head between bearing caps E4 and A4
^ At left cylinder head between bearing caps E2 and A2
14. 5 Nm plus an additional 90° (1/4) turn
^ Always replace
15. Bearing cap Pay attention to installation position and assignment
16. Intake camshaft
^ Check radial clearance with Plastigage (roller-type rocker finger removed) Wear limit 0.1 mm Run-out max. 0.01 mm
17. Exhaust camshaft
^ Check radial clearance with Plastigage (roller-type rocker finger removed) Wear limit 0.1 mm Run-out max. 0.01 mm
18. Shaft for roller-type rocker finger, intake end
19. 10 Nm
20. Shaft for roller-type rocker finger, exhaust end
21. 0-ring For roller-type rocker finger shaft Replace
22. Cylinder head
23. Intake valve
^ Do not reworked; only lapping permissible
^ Valve dimensions; Refer to Fig. 1
24. Exhaust valve
^ Do not reworked; only lapping permissible
^ Valve dimensions; Refer to Fig. 1
25. Dowel sleeve
^ 2x





Fig. 1 Valve dimensions





Note: Do not rework valves. Only lapping is permitted.

Attention:
^ Worn sodium-filled exhaust valves cannot simply be scrapped.
^ The valves must be sawn in two with an iron saw between center of stem and valve plate. When doing so, valves must not come Into contact with water. Following the above valve preparation, throw a maximum of ten into a bucket of water, then step well back out of the way of the abrupt chemical reaction involving combustion of the sodium fill.
^ After being treated in this manner, the parts can be disposed of as normal scrap.