Valve Train, Servicing
WARNING:
- Do not re-use any fasteners that are worn or deformed in normal use.
- Some fasteners are designed to be used only once, and are unreliable and may fail if used a second time. This includes, but is not limited to, nuts, bolts, washers, circlips and cotter pins. Always follow the recommendations - replace these fasteners with new parts where indicated, and any other time it is deemed necessary by inspection.
CAUTION: After installing new hydraulic valve lifters the engine must not be started for about 30 minutes (otherwise the valves will strike the pistons). Turn the crankshaft two complete revolutions by hand before starting.
Note:
- Cylinder heads which have cracks between the valve seats or between the valve seat inserts and the spark plug threads can continue to be used without reduced service life, if the cracks do not exceed a maximum of 0.3 mm (0.012 inch) in width, or when no more than the first 4 turns of the spark plug threads are cracked.
- Carefully apply a small amount of sealant D 454 300 02 at the four end points of the sealing surfaces on the cylinder head, using a small screwdriver Fig. 1.
CAUTION: Part numbers are listed here for reference only. Always check with your Parts department for the latest information.
1. Double bearing cap
- Lightly coat with sealant 454 300 02 before installing.
2. 10 Nm (7 ft. lbs.)
3. Exhaust camshaft bearing cap
- Note position of dowel sleeve
- Note installation position and numbering.
- Lightly coat last bearing cap (after chain) with sealant D 454 300 02 before installing
4. Exhaust camshaft
- Checking axial play.
- Removing and installing.
Check radial clearance using Plastigage (hydraulic valve lifters removed):
- Wear limit: 0.1 mm (0.0039 inch)
- Maximum run-out: 0.01 mm (0.0004 inch)
5. Cap
- Always replace
6. Intake camshaft bearing cap
- Note installation position and numbering.
7. Intake camshaft
- Checking axial play.
- Removing and installing.
Check radial clearance using Plastigage (hydraulic valve lifters removed)
- Wear limit: 0.1 mm (0.0039 inch)
- Maximum run-out: 0.01 mm (0.0004 inch)
8. Drive chain
- Installing.
9. 10 Nm (7 ft. lbs.)
10. Mechanical camshaft adjuster
- With valve -1- for camshaft adjustment -N205-
- Secure using 3366 bracket-tensioner before removing.
11. Hydraulic valve lifter (intake valve)
- Notes.
12. Valve keepers
13. Valve spring plate
14. Valve spring
15. Valve stem seal
- Replacing with cylinder head installed.
16. Rubber/metal seal
- Always replace
17. Seal
- Always replace
18. Cylinder head
- Removing and installing.
- Checking for distortion.
- Resurfacing.
19. Exhaust valve
20. Intake valve
21. Oil seal (Camshaft Position (CMP) sensor end)
- Replacing.
22. Rotor for CMP sensor
- Note position (notch on camshaft)
23. Washer
- Conical
24. 25 Nm (18 ft. lbs.)
25. CMP sensor
26. 10 Nm (7 ft. lbs.)
27. 55 Nm (41 ft. lbs.)
28. Camshaft sprocket
29. Oil seal (toothed belt end)
- Replacing.
30. Hydraulic valve lifter
- Notes.
- Removing and installing with cylinder head installed.
Fig. 1 Sealing end points of joints between bearing caps and cylinder head
- Using small screwdriver, carefully apply small quantity of sealant D 454 300 02 at four end points of sealing surfaces on cylinder head (arrows).
CAUTION: Part numbers are listed here for reference only. Always check with your Parts department for the latest information.