CHECKING
VALVE
SPRING SQUARENESS
1.
Put the spring
on
a surface plate, place a square
on
the side of the spring, and check
to
see
if the entire side is
in
contact with the square.
2.
Rotate the spring and measure the maximum
B.
(See illustration below.).
3.
If the measurement exceeds the allowable limit, replace. The flat surface at the end of the
spring
coil must exceed the full circumference
by
two-thirds. Check the entire surface of the
spring for scratches.
I Allowable limit
CHECKING
VALVE
SPRING TENSION
1.3
mm
0.051 in.
How
to
measure squarenass
of
valve sprin.g
111/
1.
Place the spring on a tester and compress it
to
the same degree that it is actually compressed
in
the engine,
(31
mm,
12
in.)
2.
Read
the compression load
on
the gauge.
3.
If the measurement exceeds the allowable limit, replace. See engine specifications.
130
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