[11B] ENGINE OVERHAUL <4G6-SOHC> - - CYLINDER HEAD AND VALVES - REMOVAL AND INSTALLATION | PRINT PAGE / INDEX / PRIOR / NEXT

CYLINDER HEAD AND VALVES

REMOVAL AND INSTALLATION
|  |  | 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
| REMOVAL SERVICE POINTS
| <<A>> CYLINDER HEAD BOLT REMOVAL
| Use the special tool Cylinder head bolt wrench (MB991654) to loosen the cylinder head bolts.
| <<B>> RETAINER LOCK REMOVAL
| 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.
| <<C>> VALVE STEM SEAL REMOVAL
| CAUTION Do not reuse any removed stem seal.
| INSTALLATION SERVICE POINTS
| >>A<< VALVE STEM SEAL INSTALLATION
| Install the valve spring seat. CAUTION 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. Use the special tool Valve stem seal installer (MD998774) to install a new stem seal on the valve guide.
| >>B<< VALVE SPRING INSTALLATION
| Install each valve spring with the painted end toward the rocker arm.
| >>C<< RETAINER LOCK INSTALLATION
| Compress the the valve spring using the special tool Valve spring compressor (MD998772), then install the retainer lock.
| >>D<< CYLINDER HEAD BOLT INSTALLATION
| 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. CAUTION 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.

[11B] ENGINE OVERHAUL <4G6-SOHC> - - CYLINDER HEAD AND VALVES - REMOVAL AND INSTALLATION | PRINT PAGE / INDEX / PRIOR / NEXT

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