Camshaft, Lifters and Push Rods: Locations

Valve gear, component overview





1 - Camshaft adjuster - exhaust

^ Identification- 32A

2 - 60 Nm 90 degrees (1/4 turn) further

^ Replace
^ To remove and install, counterhold with 32 mm open end wrench on camshaft

3 - Camshaft adjuster - intake

^ Identification- 24E

4 - Valve timing housing

^ Check filter of valve timing housing for dirt before installing
^ When installing, lightly oil contact surfaces of oil seals

5 - Valve stem oil seal

6 - Valve spring

^ Installed position- larger diameter on bottom

7 - Valve spring plate

8 - Valve keepers

9 - Camshaft seals

^ 3 per camshaft
^ Replace all if leak detected
^ When installing valve timing housing, item -5-, lightly oil contact surfaces of oil seals
^ Offset gaps by 120 degrees when installing
^ Do not stretch seals too wide when replacing

10 - 5 Nm 45 degrees (1/8 turn) further

11 - Bearing cap

^ Installed position

^ Installation sequence

12 - Intake camshaft

^ Check radial clearance with Plastigage(R)
^ Wear limit (radial clearance): 0.1 mm
^ Run-out: 0.01 mm (max.)
^ Checking axial clearance
^ Removing and installing camshafts
^ Identification

13 - Exhaust camshaft

^ Check radial clearance with Plastigage(R)
^ Wear limit (radial clearance): 0.1 mm
^ Run-out: 0.01 mm (max.)
^ Checking axial clearance

14 - Roller rocker finger

^ Do not interchange
^ Check roller bearing
^ Before installing, check camshaft axial clearance
^ Lubricate contact surface
^ Assembly: attach to supporting element using securing clip, item -15-

15 - Securing clip

^ Check for firm attachment

16 - Supporting element

^ With hydraulic valve clearance compensation
^ Do not interchange
^ Before installing, check camshaft axial clearance
^ Lubricate contact surface

17 - Cylinder head

18 - Valves

^ Must not be machined; only lapping is permissible
^ Valve dimensions
^ Checking valve guides
^ Machining valve seats

19 - 8 Nm





Camshaft identification

The camshaft identification is located between the cam pairs for cylinder No. 4 and 5.

A - Exhaust camshaft; identification 022 - index 101

B - Intake camshaft; identification 022 - index 102

Coat surface of bearing caps 7 and 8 with lubricating paste





- Thinly coat contact surface (hatched surface in illustration) of bearing caps 7 and 8 with lubricating paste G 052 723 A2.





Installed position of bearing caps for camshafts

^ Pointed section of bearing caps -A- for intake and exhaust camshafts faces outward.





Disassembling and assembling valve timing housing

1 - Guide rail; clipped onto valve timing housing

2 - Valve timing housing

3 - Valve -1 - for camshaft adjustment -N205-

4 - Camshaft adjustment valve 1 (exhaust) -N318-

5 - 8 Nm

Checking filter of valve timing housing for dirt





- Unclip filter -2- on back of valve timing housing -1 - and clean away any dirt or grime.





Valve dimensions

Note:
Intake and exhaust valves must not be machined. Only lapping is permitted.





WARNING!
^ Sodium-filled exhaust valves must not be scrapped without first being properly treated.
^ Using a metal saw, the valves must be cut in half between the shaft center and valve plate. They must not come into contact with water while being cut. After cutting open valves, throw not more than 10 at a time into a bucket of water. Then step back. A sudden chemical reaction will occur during which the sodium filling is consumed.
^ Valves that have been treated in this manner can then be disposed of as normal scrap metal.