CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <4G63-Turbo>
11D-44
3. Measure the total length of the valve.
Replace the valve if the length is less than the
limit.
Standard values:
Intake 109.5 mm
Exhaust 109.7 mm
Limits:
Intake 109.0 mm
Exhaust 109.2 mm
VALVE SPRINGS
1. Measure the free height of the spring.
Replace the spring if its height is smaller than the
limit.
Standard value: 47.0 mm
Limit: 46.0 mm
2. Measure the squareness of the spring.
Replace the spring if it is out of square beyond the
limit.
Standard value: 1.5
°
or smaller
Limit: 4
°
VALVE GUIDE
Measure the valve guide inside diameter and valve
stem diameter to calculate the clearance between
the valve guide and valve stem.
If the limit is exceeded, replace the valve guide or
valve, or both.
Standard values:
Intake 0.02
−
0.05 mm
Exhaust 0.05
−
0.09 mm
Limits:
Intake 0.10 mm
Exhaust 0.15 mm
VALVE SEATS
With the valve installed in position and its face
pressed against the valve seat, measure the valve
stem projection (distance between the valve stem
end and spring seating surface). If the measurement
exceeds the limit, replace the valve seat.
Standard values:
Intake 49.2 mm
Exhaust 48.4 mm
Limits:
Intake 49.7 mm
Exhaust 48.9 mm
AK202876
Total length
AB
AK300594
Out of square
Free height
AB
AK300168
Guide inside diameter
Stem diameter
Valve
guide
AE
AK202814
Valve stem
projection
Valve stem
end
Spring
seating
surface
AB
Summary of Contents for 4g63
Page 68: ...NOTES ...
