REMOVAL AND INSTALLATION

caution

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

<Right bank>

			Removal steps
		·	Rocker arm and shaft assembly <right bank> (Refer to )
		1.	Right bank oxygen sensor (front) connector connection
		2.	Accessory mounting stay
<<A>>	>>C<<	3.	Valve spring retainer lock <exhaust side>
		4.	Valve spring retainer <exhaust side>
	>>B<<	5.	Valve spring <exhaust side>
<<B>>	>>A<<	6.	Valve stem seal <exhaust side>
		7.	Valve spring seat <exhaust side>
		·	Cooling water outlet hose fitting and cooling water outlet pipe (Refer to GROUP 14 - Water Hose and Water Pipe )
<<A>>	>>C<<	8.	Valve spring retainer lock <inlet side>
		9.	Valve spring retainer <inlet side>
<<B>>	>>B<<	10.	Valve spring <inlet side>
	>>A<<	11.	Valve stem seal <inlet side>
		12.	Valve spring seat <inlet side>

<Left bank>

			Removal steps
		·	Rocker arm and shaft assembly <left bank> (Refer to )
		1.	Engine hanger
<<A>>	>>C<<	2.	Valve spring retainer lock <exhaust side>
		3.	Valve spring retainer <exhaust side>
	>>B<<	4.	Valve spring <exhaust side>
<<B>>	>>A<<	5.	Valve stem seal <exhaust side>
		6.	Valve spring seat <exhaust side>
<<A>>	>>C<<	7.	Valve spring retainer lock <inlet side>
		8.	Valve spring retainer <inlet side>
	>>B<<	9.	Valve spring <inlet side>
<<B>>	>>A<<	10.	Valve stem seal <inlet side>
		11.	Valve spring seat <inlet side>

REMOVAL SERVICE POINTS

<<A>> 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.

note

Installation position of special tool (MD998772) is different between exhaust side and inlet side.

<<B>> VALVE STEM SEAL REMOVAL

Using the special tool valve stem seal pliers (MB992085), nip the valve stem seal and remove it.

INSTALLATION SERVICE POINTS

>>A<< VALVE STEM SEAL INSTALLATION

caution

Valve stem seal for intake valves and for exhaust valves are different. Be sure to install the correct ones.
The valve stem seal must not be reused.
Do not damage the tappet wall during assembly.
Be sure to use a special tool to install the valve stem seal. Poor installation causes oil loss via valve guides.
If oil is not applied, the valve stem seal may rise to the surface after it is press fitted.

Apply a small amount of engine oil to the press-fit part and lip part of the new valve stem seal.
2.Use a special tool to install the valve stem seal, obeying the following procedures.

3.Special tool valve stem seal installer adjustable (MB992922) is composed of the components shown in the illustration.
1: Chuck
2: Sleeve
3: Lock nut (small)
4: Outer pipe
5: Lock nut (large)
6: Guide pin (5.9)
7: Guide pin (4.9)
8: Cap
9: Guide pin (5.4)

4.Adjust the inside chuck diameter, obeying the following procedures.
(1) Install the sleeve to the chuck as shown in the illustration.
(2) Install the shoulder of the valve stem seal to the chuck, aligning with the outer circumference line of the chuck as shown in the illustration.
(3) Turn the sleeve to wring the chuck.
(4) Stop the sleeve at the position where you can easily remove the valve stem seal by hand.
(5) Use the (small) lock nut to fix the sleeve.

5.Adjust the stem seal insertion length, obeying the following procedures.
(1) The position, in which the end face of the outer pipe is aligned with the outer circumference line of the chuck, is 0 mm of the insertion length. Insert the chuck and the sleeve into the outer pipe to fit the nut as shown in the illustration.
(2) Turn the chuck to adjust the valve stem seal insertion length.

note

The insertion length can change by 1 mm per the chuck turn.
To easily know how many times the chuck is turned, put the mark at the position shown in the illustration.

(3) Use a vernier caliper to measure the checkpoint (L1) of the insertion length shown in the illustration. Check the insertion length.
Standard value: 18.2 mm
(4) Use the (large) lock nut to fix the sleeve.

6.Install the cap to the chuck.
7.Apply the engine oil to the valve stem seal to set the chuck.
8.Install the valve spring seat.

9.Use the plastic hammer to insert the valve stem seal.

>>B<< VALVE SPRING INSTALLATION

Install the valve spring with its identification colour painted end facing the locker arm.
Identification colour
Inlet: White
Exhaust: Blue

>>C<< VALVE SPRING RETAINER LOCK INSTALLATION

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