Camshaft: Service and Repair

REMOVAL AND INSTALLATION

[LEFT BANK]

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

- MB990767: Front Hub and Flange Yoke Holder
- MD998443: Auto-lash Adjuster Holder
- MD998713: Camshaft Oil Seal Installer
- MD998715: Crankshaft Pulley Holder Pin
- MD998772: Valve Spring Compressor
- MB991999: Valve Stem Seal Installer

[RIGHT BANK]

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 MD998715 and MB990767 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 valve spring compressor special tool (MD998772) is different between exhaust side and intake side.

INSTALLATION SERVICE POINTS

]]A[[ CAMSHAFT OIL SEAL CASE GASKET/CAMSHAFT OIL SEAL CASE/OIL FEEDER CONTROL VALVE HOUSING GASKET/OIL FEEDER CONTROL VALVE HOUSING INSTALLATION

1. Install the camshaft oil seal case gasket and oil feeder control valve housing gasket as their protrusions are in the direction shown.
2.
CAUTION:

- Be careful that any foreign materials does not get into the oil passages.
- Thoroughly confirm that there is not any foreign materials on the mating surfaces.

Install the camshaft oil seal case and oil feeder control valve housing to the cylinder head.
3. Tighten the mounting bolt to the specified torque.
Tightening torque: 24± 3Nm (18± 2 ft-lb)

]]B[[ GASKET/OIL FEEDER CONTROL VALVE PIPE/ EYE BOLT INSTALLATION

CAUTION:
Install the oil feeder control valve pipe as follows so that the pipe is not deformed.

1. Install a gasket to one of oil feeder control valve pipes and tighten the eye bolt by hand.

2. Install a gasket to the other oil feeder control valve pipe and tighten the eye bolt to the specified torque.
Tightening torque: 30± 3Nm (22± 2 ft-lb)

3. Tighten the eye bolt which is temporarily tightened by step 1 to the specified torque.
Tightening torque: 30± 3Nm (22± 2 ft-lb)

4. Tighten the oil feeder control valve pipe mounting bolt to the specified torque.
Tightening torque: 11± 1Nm (98± 8 in-lb)

]]C[[ O-RING/ENGINE OIL CONTROL VALVE INSTALLATION

1.
CAUTION:

- Never re-use the O-ring.
- Before installing O-ring, wind the tape with the soft adhesion (sealing tape) around the oil passages cut-out area of engine oil control valve to prevent the damage. If the O-ring is damaged, it can be the cause of oil leak.

Apply a small amount of engine oil to the O-ring and then install it to the oil control valve.
2. Assemble the engine oil control valve to the cylinder head.
3. Tighten the engine oil control valve mounting bolt to the specified torque.
Tightening torque: 11± 1Nm (98± 8 in-lb)

]]D[[ ENGINE OIL PRESSURE SWITCH INSTALLATION

1. Remove sealant from the engine oil pressure switch and cylinder head surfaces.

2. Apply sealant to the thread of the engine oil pressure switch as shown.
Specified sealant: 3M(TM) AAD Part No.8672, 3M(TM) AAD Part No.8679/8678 or equivalent
NOTE:
Install the engine oil pressure switch immediately after applying sealant.

3. Install the engine oil pressure switch to the oil feeder control valve housing.
4.
CAUTION:
After installing the parts, wait at least one hour. Never start the engine or let engine oil or water touch the sealant application area during that time.

Tighten the engine oil pressure switch to the specified torque.
Tightening torque: 10± 2Nm (89± 17 in-lb)

]]E[[ VALVE STEM SEAL INSTALLATION

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

2.
CAUTION:

- Valve stem seals cannot be reused.
- Special tool 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.

]]F[[ VALVE SPRING INSTALLATION

Install the valve spring with its identification color painted end facing the rocker arm.

]]G[[ VALVE SPRING RETAINER LOCK INSTALLATION

Use special tool MD998772 to compress the valve spring in the same manner as removal.

]]H[[ ROCKER ARM AND SHAFT ASSEMBLY INSTALLATION

1. Install the intake side rocker arm and shaft assembly so that the dia.6 mm (0.24inch) and 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± 3Nm (23± 2 ft-lb)
3. Install the exhaust side rocker arm and shaft 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± 1Nm (115± 9 in-lb)

6. Remove special tool MD998443.

]]I[[ CAMSHAFT OIL SEAL INSTALLATION

1. Apply engine oil to the camshaft oil seal lip.

2. Use special tool MD998713 to press-fit the camshaft oil seal.

]]J[[ CAMSHAFT SPROCKET INSTALLATION

1. Use special tools MD998715 and MB990767 in the same way as during removal to install the camshaft sprocket.
2. Tighten the camshaft sprocket mounting bolt to the specified torque.
Tightening torque: 88± 10Nm (65± 7 ft-lb)

]]K[[ CAMSHAFT POSITION SENSOR SUPPORT INSTALLATION

1. Remove old sealant from the camshaft position sensor support and cylinder head surfaces.

2. Apply sealant to the camshaft position sensor support flange in a continuous bead as shown in the illustration.
Specified sealant: 3M(TM) AAD Part No.8672, 3M(TM) AAD Part No.8679/8678 or equivalent
NOTE:
Install the camshaft position sensor support immediately after applying sealant.

3. Install the camshaft position sensor support to the cylinder head.
4.
CAUTION:
After installing the parts, wait at least one hour. Never start the engine or let engine oil or water touch the sealant application area during that time.

Tighten the camshaft position sensor support mounting bolts to the specified torque.
Tightening torque: 14± 1Nm (120± 13 in-lb)