If the minimum unloaded length value and/or the
minimum tension value is below the minimum limit,
replace the valve spring. Reference:
Characteristic
Valve spring unloaded length (marked in PINK)
45.2 ± 0.5 mm
Valve spring unloaded length (marked in OR-
ANGE)
47.4 mm
3. Check that the valve spring supporting surface
is even.
a. Load 49 N to the valve spring.
b. Fit a thickness gauge at point "A", indicated by
the arrow in the figure.
The thickness gauge must measure 0.07 mm
thickness and 12.5 mm length.
Make sure that the thickness gauge does not
reach the spiral centre.
If the thickness gauge reaches the spiral centre,
replace the spring.
Valve guides and seats
Check
Check that the valve spring cap seats and cap
locks are not cracked or worn. Replace the defec-
tive parts, if necessary.
Valve guide replacement
THE REMOVAL AND FITTING OF THE VALVE GUIDE MUST BE PERFORMED WITH A HEAD-
CYLINDER TEMPERATURE EQUIVALENT TO 80°C - 100°C, AFTER HEATING IT GRADUALLY.
PORTER 1.3 16V Engine
EN - 275
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