REPAIR valve gear. Check the status of valve springs
Each time you run razborochno-assembly operations
check valve mechanism on the elasticity of the valve springs
special scales (Fig. 41).
When testing the springs on the scale is determined by the effort that
should be for the new details:
- For the big spring at a length of 27.5 mm (44 + -3.3) kg
and length of 36.5 mm (17.6 + -1.3) kg;
- For a small spring at a length of 25.5 mm (26.6 ± 2) kg and
at length 34.5 mm (11 + -0.8) kg.
If verification is established that the force given by
spring differs from the above quantities by more than
10%, the spring must be replaced.
It should be borne in mind that the force generated by spring
reduced if the chamfer and bevel seat valve have been
grinding, since the metal removal with beveled
the end of the valve stem is separated from the reference plane
a spring and a preload valve is reduced.
Therefore, when assembling parts of the valve mechanism on the head
cylinders under the support plate springs must enclose
additional washers. The thickness of the washers should be chosen so that
with the valve closed length of a large spring was 36.5 mm.