)
| Removal steps |
|||
|---|---|---|---|
<<A>> |
>>D<< |
1. |
Cylinder head bolt |
| 2. |
Cylinder head assembly |
||
| 3. |
Cylinder head gasket |
||
| <<B>> |
>>C<< |
4. |
Retainer lock |
| 5. |
Valve spring retainer |
||
| >>B<< |
6. |
Valve spring |
|
| 7. |
Intake valve |
||
| <<B>> |
>>C<< |
8. |
Retainer lock |
| 9. |
Valve spring retainer |
||
| >>B<< |
10. |
Valve spring |
|
| 11. |
Exhaust valve |
||
| <<C>> |
>>A<< |
12. |
Valve stem seal |
| 13. |
Valve spring seat |
||
| <<C>> |
>>A<< |
14. |
Valve stem seal |
| 15. |
Valve spring seat |
||
| 16. |
Intake valve guide |
||
| 17. |
Exhaust valve guide |
||
| 18. |
Intake valve seat |
||
| 19. |
Exhaust valve seat |
||
| 20. |
Cylinder head |
)
Use the special tool Cylinder head bolt wrench (MB991654) to loosen the cylinder head
bolts.
)
Compress the valve spring using the special tool Valve spring compressor (MD998772), then
remove the retainer lock.
NOTE: Store removed valves, springs and other parts, after putting to each of them a tag that
identifies its cylinder No. or installation location.
)
CAUTION)
- Install the valve spring seat.
- Do not reuse any removed valve stem seal.
- The special tool must always be used when installing the valve stem seal. Improper installation could result in oil leaks past the valve guide.
CAUTION- Use the special tool Valve stem seal installer (MD998774) to install a new stem seal on the valve guide.
)
Install each valve spring with the painted end toward the rocker arm.
Compress the the valve spring using the special tool Valve spring compressor (MD998772),
then install the retainer lock.
)
- When reusing a cylinder head bolt, check that its nominal length (shank length) is not greater than the limit. If the limit is exceeded, replace the bolt.
Limit: 99.4 mm
- Apply engine oil to the threads and washer of the bolt.
)
- Use the special tool Cylinder head bolt wrench(MB991654) to tighten the bolts to the specified torque in the indicated sequence.
Tightening torque: 78 ±
2 N·m
- Loosen all the bolts completely.
- Tighten the bolts again to a torque of 20 ± 2 N·m in the indicated sequence.
- Make paint marks on each bolt's head and on the cylinder head.
)
- Turn the bolts 90° in the tightening direction and in the indicated sequence.
- Give another 90° turn in the tightening direction to each bolt, making sure that the paint mark on the bolt head and that on the cylinder head are on the same line.
- If the tightening angle is smaller than the specified angle, proper fastening performance could not be assured. Be sure to respect the angle indicated above.
- If the bolt is tightened to an angle greater than the specified angle, loosen the bolt completely and then retighten it beginning with the first step.
CAUTION