- After measuring the valve guide diameter and the
valve stem diameter, check the clearance be-
tween guide and stem.
OUTLET
Specification Desc./Quantity
Standard clearance: 0.025 ÷ 0.052 mm
Admissible limit: 0.09 mm
INLET
Specification Desc./Quantity
Standard clearance: 0.013 - 0.04 mm
Admissible limit: 0.08 mm
- Check that there are no signs of wear on the surface of contact with the articulated register terminal.
- If the checks above give no failures, you can use
the same valves. To obtain better sealing perform-
ance, grind the valve seats. 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 CONTACT SURFACE, DO NOT KEEP ROTATING THE VALVE WHEN
NO LAPPING COMPOUND IS LEFT. CAREFULLY WASH THE CYLINDER HEAD AND THE
VALVES WITH A SUITABLE PRODUCT FOR THE TYPE OF LAPPING COMPOUND BEING USED.
CAUTION
GP 800 i.e. Characteristics
CHAR - 27
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