CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <4G63-Turbo>
11D-43
CAUTION
•
If the tightening angle is smaller than 90
°
,
proper fastening performance could not be
assured. Be sure to respect that angle.
•
If the bolt is tightened to an angle greater than
the specified angle, loosen the bolt com-
pletely and then retighten it beginning with
the first step.
6. Make paint marks on each bolt’s head and on the
cylinder head.
7. Turn the bolts 90
°
in the tightening direction and in
the indicated sequence.
8. Give another 90
°
turn in the tightening direction to
each bolt, making sure that the paint mark on the
bolt head and that on the cylinder head are on the
same line.
INSPECTION
M1113007000680
CYLINDER HEAD
1. Before cleaning the cylinder head, check it for
traces of water and gas leakage and for cracks
and any other damage.
2. Thoroughly remove oils, scale, sealants, carbon
and other contamination. Clean the oil passages,
then check using compressed air that they are not
blocked.
CAUTION
The thickness of the metal that can be removed
by grinding from both the cylinder head and the
mating cylinder block is limited to 0.2 mm in
total.
3. Check the cylinder head gasket surface for warp
using a straightedge and thickness gauge.
If the surface is warped beyond the limit, grind the
surface for rectification.
Gasket surface warp
Standard value: Less than 0.05 mm
Limit: 0.2 mm
Grinding limit: 0.2 mm
Cylinder head height (standard value for new
part): 131.9
−
132.1 mm
VALVES
1. Check the valve face for correct contact with the
seat. Reface the valve if the contact is partial or
one sided.
2. Measure the margin.
Replace the valve if its margin is smaller than the
limit.
Standard values:
Intake 1.0 mm
Exhaust 1.5 mm
Limits:
Intake 0.5 mm
Exhaust 1.0 mm
AK202720
Paint marks
90˚
90˚
AB
AK202724
AK300593AB
Margin
Contact
(Should be at
centre of face)
Содержание 4g63
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