REMOVAL AND INSTALLATION



Removal steps

>>C<<
 1.
 Cylinder head bolt


2.
 Cylinder head bolt washer


3.
 Cylinder head assembly


4.
 Cylinder head gasket
<<A>>
 >>B<<
 5.
 Retainer lock


6.
 Valve spring retainer


7.
 Valve spring


8.
 Intake valve
<<A>>
 >>B<<
 9.
 Retainer lock


10.
 Valve spring retainer


11.
 Valve spring


12.
 Exhaust valve

>>A<<
 13.
 Valve stem seal


14.
 Valve spring seat

>>A<<
 15.
 Valve stem seal


16.
 Valve spring seat


17.
 Valve guide


18.
 Valve guide


19.
 Intake valve seat


20.
 Exhaust valve seat


21.
 Cylinder head

REMOVAL SERVICE POINTS

<<A>> RETAINER LOCK REMOVAL

While compressing the valve spring using the special tool Valve spring compressor (MD999597), remove the retainer lock.
note To facilitate reassembly, the valve, spring and other parts removed should be kept together and attached with a tag showing where it has been assembled including the cylinder number.

INSTALLATION SERVICE POINTS

>>A<< VALVE STEM SEAL INSTALLATION

1.Install the valve spring seat.
2.
caution
  • The valve stem seal should not be reused.
  • A new valve stem seal should be installed correctly using the special tool. Incorrectly installed valve stem seal will allow engine oil to leak through into the combustion chamber.
Lightly coat a new valve stem seal with engine oil.
3.Insert the new valve stem seal into the valve guide using the special tool Valve stem seal installer (MB991994).
note Use the special tool, on which the number "MB991994A" is stamped.

>>B<< RETAINER LOCK INSTALLATION

While compressing the valve spring using the special tool Valve spring compressor (MD999597), install the retainer lock.

>>C<< CYLINDER HEAD BOLT INSTALLATION

1.Inspect all reused cylinder bolts according to the following procedure.
(1) Measure the outside diameter shown in the illustration (arrow "A").
(2) Measure the smaller outside diameter shown in the illustration (arrow "B").
(3) When the difference between the smaller outside diameters (arrow "A" and "B") exceeds the standard value, replace the cylinder head bolt.
Standard value: 0 - 0.15 mm
2.Install the cylinder head bolt and washer assembly onto the cylinder head.

3.In accordance with the installation order, tighten them to the specified torque of 24.5 ± 2 N·m in several steps.
4.Make sure all bolts reach the specified torque.

5.Put paint marks on the bolt heads and the cylinder as illustrated.
6.
caution
  • When the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.
  • When the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedure.
Tighten the bolts in the correct sequence by 180 to 184 degree angle.
Ensure that the paint marks on the bolt heads and the cylinder are aligned in a straight line.