REMOVAL AND INSTALLATION

<Left bank>

caution

*Remove and assemble the marked parts in each cylinder unit.

Pre-removal and Post-installation Operation

Surge Tank Assembly Removal and Installation (Refer to GROUP 15 - Inlet Manifold ).

Ignition Coil Removal and Installation (Refer to GROUP 16 - Ignition Coil ).

			Removal steps
		1.	Blow-by hose connection
		2.	PCV hose connection
		3.	Rocker cover assembly
		4.	Rocker cover gasket
		5.	Spark plug guide seal
<<A>>	>>D<<	6.	Rocker arm and shaft assembly
<<B>>	>>C<<	7.	Valve spring retainer lock
		8.	Valve spring retainer
	>>B<<	9.	Valve spring
	>>A<<	10.	Valve stem seal
		11.	Valve spring seat

<RIGHT BANK>

Pre-removal Operation

Engine Coolant Draining (Refer to GROUP 14 - On-vehicle Service, Engine Coolant Replacement ).
Surge Tank Removal (Refer to GROUP 15 - Intake Manifold ).
Cooling Water Outlet Fitting Removal (Refer to GROUP 14 - Water Pump ).
Cooling Water Outlet Pipe Removal (Refer to GROUP 14 - Water Hose and Water Pipe ).

Post-installation Operation

Cooling Water Outlet Pipe Installation (Refer to GROUP 14 - Water Hose and Water Pipe ).
Cooling Water Outlet Fitting Installation (Refer to GROUP 14 - Water Pump ).
Surge Tank Installation (Refer to GROUP 15 - Intake Manifold ).
Engine Coolant Refilling (Refer to GROUP 14 - On-vehicle Service, Engine Coolant Replacement ).

			Removal steps
		1.	Blow-by hose connection
		2.	Breather hose connection
		3.	Accessory mount stay
		4.	Rocker cover assembly
		5.	Rocker cover gasket
		6.	Spark plug guide seal
<<A>>	>>D<<	7.	Rocker arm and shaft assembly
<<B>>	>>C<<	8.	Valve spring retainer lock
		9.	Valve spring retainer
	>>B<<	10.	Valve spring
	>>A<<	11.	Valve stem seal
		12.	Valve spring seat

REMOVAL SERVICE POINTS

<<A>> ROCKER ARM AND SHAFT ASSEMBLY REMOVAL

1.Before rocker arm and shaft assembly removal, install special tool lash adjuster holder (MD998443) as shown in the illustration so that the rocker arm lash adjusters will not fall out.
2.

caution

Never disassemble the rocker arm, shaft and rocker arm lash adjuster assembly.

Loosen the rocker arm and shaft assembly mounting bolt, and then remove the rocker arm and shaft assembly with the bolt still attached.

<<B>> VALVE SPRING RETAINER LOCK REMOVAL

caution

When removing valve spring retainer lock, leave the piston of each cylinder in the TDC (Top Dead Centre) position. The valve may fall into the cylinder if the piston is not properly in the TDC position.

Use special tool valve spring compressor (MD998772) to compress the valve spring, and remove the valve spring retainer locks.

INSTALLATION SERVICE POINTS

>>A<< VALVE STEM SEAL INSTALLATION

1.Apply a small amount of engine oil to the valve stem seal.

caution

Valve stem seals cannot be reused.
The special tool valve stem seal installer (MB991999) must be used to install the valve stem seal. Improper installation could result in oil leaking past the valve guide.

Use special tool (MB991999) to fill a new valve stem seal in the valve guide using the valve stem area as a guide.

>>B<< VALVE SPRINGS INSTALLATION

Install the valve springs with its identification colour painted end facing the locker arm.

>>C<< VALVE SPRING RETAINER LOCKS INSTALLATION

Use special tool valve spring compressor (MD998772) to compress the valve spring in the same manner as removal, install the valve spring retainer lock.

>>D<< ROCKER ARM AND SHAFT ASSEMBLY INSTALLATION

1.Ensure that all rocker arms do not press against the valve, then pre-tighten the rocker arm and shaft assembly with the mounting bolt.

2.Check that notches in the each rocker arm shaft are facing the direction shown in the illustration.

3.Check the rocker shaft spring is installed in the direction towards the spark plug guide shown.
4.Tighten the rocker arm and shaft assembly mounting bolts to the specified torque.

Tightening torque: 31 ± 3 N·m

5.Remove the special tool lash adjuster holder (MD998443) which was installed to the rocker arm when removing the rocker arm and shaft assembly.