Cylinder Head Assembly: Service and Repair

REMOVAL AND INSTALLATION













- MB990767: Front Hub and Flange Yoke Holder
- MD998051: Cylinder Head Bolt Wrench
- MD998715: Crankshaft Pulley Holder Pin

REMOVAL SERVICE POINTS

[[A]] CAMSHAFT SPROCKET REMOVAL





Use special tools MD998715 and MB990767 to remove the camshaft sprocket.

[[B]] CYLINDER HEAD ASSEMBLY REMOVAL





Use special tool MD998051 to loosen each bolt in two or three steps in the order shown in the illustration.

INSTALLATION SERVICE POINTS

]]A[[ CYLINDER HEAD GASKET INSTALLATION

1. Degrease the cylinder head and cylinder block gasket mounting surfaces.





2. Make sure that the gasket has the proper identification mark for the engine.
3. Lay the cylinder head gasket on the cylinder block with the identification mark at the front top.

]]B[[ CYLINDER HEAD ASSEMBLY INSTALLATION

1.
CAUTION:
Be careful that no foreign material gets into the cylinder, coolant passages or oil passages. Engine damage may result.

Use a scraper to clean the gasket surface of the cylinder head assembly.





2.
CAUTION:
Install the head bolt washers with the beveled side facing upwards as shown in the illustration.

Using special tool MD998051 and a torque wrench, tighten the bolts to the specified torque in the order shown in the illustration. (in two or three cycles)
Tightening torque: 108± 5Nm (80± 3 ft-lb) to 0Nm (0 in-lb) to 108± 5Nm (80± 3 ft-lb)


]]C[[ 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)


]]D[[ 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)