Inspecting the valves
- Measure the width of the sealing surface on the
valve seats and on the valves.
Sealing surface width: After use: Intake and ex-
haust: 1.6 mm
- If any of the sealing surfaces on the valves is
wider than the specified limit or is damaged in one
or more points, or curved, replace the valve with a
new one.
CAUTION
DO NOT REVERSE THE FITTING POSITIONS OF THE
VALVES (RIGHT - LEFT).
Characteristic
Valve wear check Standard: Intake and ex-
haust:
0.99 - 1.27 mm
- Measure the diameter of the valve stems in the
three positions indicated in the diagram.
- Calculate the clearance between valve and valve
guide.
- Check that there are no signs of wear on the sur-
face of contact with the articulated register termi-
nal.
- If the checks above give no failures, you can use
the same valves. For best sealing results, it is ad-
visable to grind the valves. Grind the valves gently
with a fine-grained lapping compound. During the
grinding, keep the cylinder head with the valve ax-
es in a horizontal position. This will prevent the
lapping compound residues from penetrating be-
tween the valve stem and the guide (see figure).
CAUTION
TO AVOID SCORING THE FAYING SURFACE, DO NOT
KEEP ROTATING THE VALVE WHEN NO LAPPING COM-
POUND IS LEFT. CAREFULLY WASH THE CYLINDER
HEAD AND THE VALVES WITH A SUITABLE PRODUCT
FOR THE TYPE OF LAPPING COMPOUND BEING USED.
N.B.
DO NOT CHANGE THE POSITIONS THE VALVES ARE FIT-
TED IN
Characteristic
Engine Carnaby 125 - 200
ENG - 146
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