Valve Guide Seal: Service and Repair
REMOVAL AND INSTALLATION
CAUTION:
*Remove and assemble the marked parts in each cylinder unit.
[LEFT BANK]
Required Special Tools:
- MB990767: Front Hub and Flange Yoke Holder
- MB992182: Valve Stem Seal Installer
- MD998443: Auto-lash Adjuster Holder
- MD998713: Camshaft Oil Seal Installer
- MD998719: Pin
- MD998772: Valve Spring Compressor
- MD998777: Camshaft Oil Seal Installer Adapter
[RIGHT BANK]
Required Special Tools:
- MB990767: Front Hub and Flange Yoke Holder
- MB992182: Valve Stem Seal Installer
- MD998443: Auto-lash Adjuster Holder
- MD998713: Camshaft Oil Seal Installer
- MD998719: Pin
- MD998772: Valve Spring Compressor
REMOVAL SERVICE POINTS
[[A]] ROCKER ARM, SHAFT AND LASH ADJUSTER ASSEMBLY (EXHAUST SIDE)/ROCKER ARM AND SHAFT ASSEMBLY (INTAKE SIDE) REMOVAL
1. Install special tool MD998443 as shown in the illustration so that the lash adjusters will not fall out.
2.
CAUTION:
Never disassemble the rocker arm and shaft 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]] CAMSHAFT SPROCKET REMOVAL
Use special tools MB990767 and MD998719 to remove the camshaft sprocket.
[[C]] CAMSHAFT OIL SEAL REMOVAL
1. Make a notch in the oil seal lip section with a knife, etc.
2.
CAUTION:
Be careful not to damage the camshaft and the cylinder head.
Cover the end of a flat-tipped screwdriver with a shop towel and insert into the notched section of the oil seal, and pry out the oil seal to remove it.
[[D]] VALVE SPRING RETAINER LOCK REMOVAL
CAUTION:
When removing valve spring retainer locks, leave the piston of each cylinder in the TDC (Top Dead Center) position. The valve may fall into the cylinder if the piston is not properly in the TDC position.
Use special tool 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 intake side.
[[E]] POWER STEERING OIL PUMP REMOVAL
1. With the hose installed, remove the power steering oil pump from the bracket.
2. Tie the removed power steering oil pump using a string at a position where it will not interfere with the removal and installation of valve stem seal.
INSTALLATION SERVICE POINTS
]]A[[ VALVE STEM SEAL INSTALLATION
1.
CAUTION:
Valve stem seal for intake valves and for exhaust valves are different.
Be sure to install the correct ones.
- Valve stem seal identification color.
Intake: GREY
Exhaust: GREY GREEN
Apply an adequate and minimum amount of engine oil to the valve stem seal.
2.
CAUTION:
- Valve stem seals cannot be reused.
- Special tool must be used to install the valve stem seal. Improper installation could result in oil leaking past the valve guide.
Use special tool MB992182 to fill a new valve stem seal in the valve guide using the valve stem area as a guide.
]]B[[ VALVE SPRING INSTALLATION
Install the valve spring with its identification color painted end facing the locker arm.
Identification color
Intake: White
Exhaust: Blue
]]C[[ VALVE SPRING RETAINER LOCK INSTALLATION
Use special tool MD998772 to compress the valve spring in the same manner as removal.
]]D[[ ROCKER ARM AND SHAFT ASSEMBLY (INTAKE SIDE)/ROCKER ARM, SHAFT AND LASH ADJUSTER ASSEMBLY (EXHAUST SIDE) INSTALLATION
1. Install the intake side rocker arm and shaft assembly so that the dia.5.5 mm (0.22 inch) holes of rocker arm shaft face the cylinder head side.
2. Tighten the intake side rocker arm shaft mounting bolts to the specified torque.
Tightening torque: 31 ± 3 Nm (23 ± 2 ft-lb)
3. Install the exhaust side rocker arm, shaft and lash adjuster assembly so that the notch of rocker arm shaft is located as shown in the figure.
4. Check that the identification mark of exhaust side rocker shaft cap is located as shown in the figure.
5. Tighten the exhaust side rocker arm shaft mounting bolts to the specified torque.
Tightening torque: 13 ± 1 Nm (115 ± 8 in-lb)
6. Remove special tool MD998443.
]]E[[ ROCKER COVER INSTALLATION
Tighten the bolts in order of the numbers shown in the illustration.
]]F[[ CAMSHAFT OIL SEAL INSTALLATION
1. Apply engine oil to the camshaft oil seal lip.
2. Use special tools MD998713 and MD998777 to press-fit the camshaft oil seal.
]]G[[ CAMSHAFT SPROCKET INSTALLATION
1. Use special tools MB990767 and MD998719 in the same way as during removal to hold the camshaft sprocket.
2. Tighten the camshaft sprocket mounting bolt to the specified torque.
Tightening torque: 90 ± 10 Nm (66 ± 7 ft-lb)
]]H[[ ENGINE OIL PRESSURE SWITCH INSTALLATION
Apply the specified sealant to the thread of the engine oil pressure switch.
Specified sealant: ThreeBond 1141J or equivalent
]]I[[ O-RING/ENGINE OIL CONTROL VALVE INSTALLATION
1.
CAUTION:
- Never re-use the O-ring.
- Before installing O-ring, wind sealing tape around the oil passages cut-out area of engine oil control valve, to prevent damage. If the O-ring is damaged, it can cause an oil leak.
Apply a small amount of engine oil to the O-ring and then install it to the engine oil control valve.
2. Install the engine oil control valve to the cylinder head.
3. Tighten the engine oil control valve.
Tightening torque: 11 ± 1 Nm (97 ± 8 in-lb)