Caution: Always replace the valve stem seals with new ones after each removal.
2. Install the valve stem seals:
Attention:
- Make sure the valves are seated correctly in their seats.
- Apply engine oil to the inside of the valve guides.
Note: It is very important to use the oil-reflecting cap fitting device (Mot. 1759) or the oil-reflecting cap fitting kit to install the oil-reflecting caps.
Oil seals with lower spring retaining washer:
- Insert the valve into the cylinder head.
- Install the protective device (Mot. 1511) on the valve stem.
Note: The inside diameter of the protector must match the diameter of the valve stem.
Caution: Do not lubricate the valve stem seals.
- While holding the valve against the seat, install the valve stem seal onto the guard on the valve stem, then push the valve stem seal through the guard.
- Remove the protective device from the valve stem.
- Install the mandrel (8) through the valve stem.
Note: The inside diameter of the mandrel must match the diameter of the valve stem. Also, the base of the mandrel must be pressed against the part of the valve stem seal that acts as a thrust washer for the valve spring.
- Press on the oil seal by gently tapping the mandrel with your palm until the oil seal rests against the cylinder head.
- Repeat the procedure for installing the valve stem seals for the remaining valves.
Oil seals without lower spring retaining washer:
- Insert the valve into the cylinder head.
- Install the protective device (Mot. 1759) on the valve stem.
Note: The inside diameter of the protector must match the diameter of the valve stem.
Caution: Do not lubricate the valve stem seals.
- While holding the valve against the seat, install the valve stem seal onto the guard on the valve stem, then push the valve stem seal through the guard
- Remove the protective device from the valve stem.
- Install the guide tube with the bushing assembly onto the oil deflector cap.
- Press on the oil seal by gently tapping the sleeve with your palm until the guide tube rests against the cylinder head.
- Repeat the procedure for installing the valve stem seals for the remaining valves.
3. Install valve springs and valve retainers.
4. Compress the valve spring with a special tool (Mot. 1502), as when removing the valve.
5. Insert the crackers with tweezers.
6. Install the crackers for the remaining valves in the same manner.
7. Apply two beads of RHODORSEAL 5661 (5) sealant with a diameter of 2 mm to bearing No.5 of the cylinder head.
8. Apply two drops of sealant WiODORSl /-I. 5661 (6) to bearing No.2 of the cylinder head.
9. Apply a drop of oil to the camshaft bearings in the cylinder head.
10. Install the camshaft into the cylinder head.
11. Install the camshaft bearing caps.
12. Tighten the bearing cover mounting bolts No.5 of the camshaft to a torque of 9 N·m.
13. Install the rocker shaft by placing the rocker arms on the corresponding valve stems. The mark (7) should be on the flywheel side.
14. Tighten the camshaft bearing cap bolts in the sequence shown in the figure to a torque of 5 N·m.
15. Loosen the mounting bolt (1).
16. Tighten the bolt (1) again to a torque of 7 Nm, and then tighten it further by an angle of 50° ±6°.
17. Repeat the procedure described with bolt (1) for bolts (2) to (10)
18. Make sure that the camshaft oil seal seat is clean.
19. Install the camshaft oil seal:
Note: A drift (Mot. 1605) can be used to install the camshaft oil seal.
- Insert the seal lips.
- Screw the threaded rod into the camshaft oil seal installation tool (Mot. 1587) into the camshaft.
- Install the oil seal with the protective device onto the camshaft, being careful not to touch the oil seal.
- Install the cover (8) with the nut (9) of the camshaft oil seal installation tool (Mot. 1587).
- Screw in the nut of the device so that the cover of the device rests against the cylinder head.
- Loosen the nut of the device and remove the cover, protective device and threaded rod.
20. Install the camshaft sprocket.
Note: Replace the camshaft sprocket mounting bolt with a new one after each removal.
21. Using the timing drive fixing device (Mot. 799-01) tighten the camshaft sprocket mounting bolt to a torque of 30 Nm, and then tighten it further by an angle of 45° ±6°.
22. Install the rocker cover.