Cylinder Head Assembly: Service and Repair

REMOVAL AND INSTALLATION













Required Special Tools:

- MB990767: Front Hub and Flange Yoke Holder

- MB991614: Angle Gauge

- MD998719: Pin

REMOVAL SERVICE POINTS

[[A]] CAMSHAFT SPROCKET REMOVAL





Use special tools MB990767 and MD998719 to remove the camshaft sprocket.

[[B]] CYLINDER HEAD ASSEMBLY REMOVAL





Loosen the bolts in two or three steps in the order of the numbers shown in the illustration, and remove them.

INSTALLATION SERVICE POINTS

]]A[[ 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. Check in the following procedure before reusing the cylinder head bolt.
(1) Measure the outside diameter "A".
(2) Measure the smallest outside diameter "B" within the range "X" shown in the illustration.
(3) If the difference of outside diameter of thread exceeds the limit, replace the cylinder head bolt.
Limit: 0.1mm (0.0039 inch)










3. Tighten the bolts to the specified torque in the order shown in the illustration. (in two or three cycles)
Tightening torque: 45 ± 2 Nm (33 ± 1 ft-lb)






4.
CAUTION:

- If the bolt is turned less than 150 to 154 degrees, proper fastening performance may not be achieved. Be sure to turn the bolt exactly 150 to 154 degrees.

- If the bolt is overtightened, loosen the bolt completely and then retighten it by repeating the tightening procedure from step 1.

Using special tool MB991614, tighten the cylinder head bolt another 150 to 154 degrees.

]]B[[ 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)