CYLINDER HEAD AND VALVES
ENGINE OVERHAUL
11B-40
NOTE: Bolts and washers are different parts for
bolts on the timing chain side.
AK502392
8
10
9
7
3
5
1
2
6
4
AC
Timing chain side
4. Tighten cylinder head bolts in several steps to the
specified torque of 35
± 2 N⋅m according to the
assembly order.
AK502523
AC
Paint mark
Paint mark
90˚
90˚
Paint mark
Paint mark
5. Put a paint mark on all of cylinder head bolt heads
and cylinder head.
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.
6. Tighten the cylinder head 90° according to the
tightening order.
Tighten it further 90° and make sure that the paint
mark on the cylinder head bolt is in a straight line
with that on the cylinder head.
INSPECTION
M1113007003106
CYLINDER HEAD
1. Check the cylinder head for water leakage, gas
leakage, damage or cracks before cleaning.
2. Completely remove oil, scale, sealant, carbon,
etc. After cleaning oil passages, blow air to make
sure that they are not clogged.
AK502740
CAUTION
The grinding limit shall be within 0.2 mm in com-
bination with the cylinder block to be assembled.
3. For the flatness on the cylinder head bottom,
measure distortion using a straight edge and free
gauge. If the distortion exceeds the limit, grind
and repair it.
Distortion on bottom
Standard value: Within 0.05 mm
Limit: 0.2 mm
Grinding limit: 0.2 mm
Cylinder head height: 128.5 mm
VALVE
AK305408
AB
Margin
The bottom of valve
seat contact facet
1. Repair the valve seat if contact with the valve seat
is poor, uneven or broken.
2. Measure the margin.
If the limit is exceeded, replace the valve.
Standard value:
Inlet 1.022 mm
Exhaust 1.094 mm
Limit:
Inlet 0.522 mm
Exhaust 0.594 mm
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