Repair Manual

CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <4A9>
11B-34
REMOVAL SERVICE POINTS
<<A>> RETAINER LOCK REMOVAL
AK304941
AB
MD999597
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 INSTALLA-
TION
AK304886
AB
MB991994
Valve
stem
seal
1. Install the valve spring seat.
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.
2. 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
AK304941
AB
MD999597
While compressing the valve spring using the special
tool Valve spring compressor (MD999597), install the
retainer lock.
>>C<< CYLINDER HEAD BOLT
INSTALLATION
AK401051
15 mm
29 mm
40 mm
A
B
AB
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.
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