A
B
C
D
E
F
G
H
L
M
N
P
section
N 4.5
88 1098/1098S - M.Y. 2007 - edition 00
Engine
Checking the valve
Check that the stem and the surface that contacts the valve seat are in good condition.
There must be no pitting, cracks, deformations or signs of wear.
Warning
The valves cannot be ground.
Perform the following checks.
Measure the diameter of the valve stem (B) at various points along the section that runs in the valve guide.
Check the valve stem for buckling. Place it on a “Vee” block and measure deformation with a dial gauge.
Service limit: 0.053 mm.
Check that the valve head band (at 45° to the valve head top face) is concentric to the valve stem as follows: place the valve on
a Vee block, set a dial gauge at right angles to the head and rotate the valve.
Nominal concentricity: 0.01 mm.
Service limit: 0.03 mm.
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