Valve Train, Servicing

Valve train, servicing

Note:

^ Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can continue to be used without reducing service life provided the cracks do not exceed a maximum of 0.3 mm in width, or when no more than the first four spark plug threads are cracked.
^ After new hydraulic lifters, DO NOT start the engine for approx. 30 minutes or the valves will strike the pistons. After 30 minutes manually turn the crankshaft two rotations before starting.






1. 100 Nm (74 ft. lbs.)
^ Use 3415 counterhold to loosen and tighten
2. Camshaft sprocket
3. Oil seal
4. Woodruff key
^ Ensure tight fit
5. 20 Nm (15 ft. lbs.)
6. Bearing cap
^ Lightly coat bearing cap 1 contact surfaces with D 454 300 A2 sealant
7. Camshaft
^ Radial clearance, checking with plastigage: Wear limit: 0.1 mm
^ Runout: max. 0.05 mm
8. Hydraulic lifter
^ Do not interchange
^ with hydraulic clearance compensation
^ Store with cam contact surface facing downward
^ Check camshaft axial clearance before installing
^ Oil contact surfaces
9. Keepers
10. Valve spring retainer, upper
11. Valve spring
Cylinder head removed: use tool 2037
Cylinder head installed:
12. Valve stem seal
13. Valve guide
^ Replacement parts with shoulder
14. Cylinder head
15. Intake and exhaust valves
^ Do not rework! Only lapping is permitted