)
| 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 (MD998735 or
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.
)
Do not reuse removed valve stem seal.
)
- Use the special tool Valve stem seal installer (MD998737) to install the stem seal on the valve guide. Use the stem of the valve to guide the stem seal.
)
NOTE: Do not confuse the stem seals for intake valves with those for exhaust valves.
)
Install the valve spring whose small diameter is shown from the rocker arm side.
Compress the valve spring using the special tool Valve spring compressor (MD998735 or
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.
)
- Tighten the bolts to 78 ± 2 N·m in the indicated sequence.
NOTE: Use the special tool Cylinder head bolt wrench (MB991654) to tighten the bolts.
- Loosen all the bolts completely.
- Tighten the bolts again to a torque of 20 ± 2 N·m in the indicated sequence.
)
- If the tightening angle is smaller than 90°, proper fastening performance could not be assured. Be sure to respect that angle.
- 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.
- Make paint marks on each bolt’s head and on the cylinder head.
CAUTION- 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.