Grinding of valve seat chamfer is necessary to make
required when replacing valve guides, as well as
with large wear facets and beating about the holes in the
Saddles intake and exhaust valves have a large motor
hardness (not less than 55 Rockwell C scale), and therefore
chamfering seat proizvoditetolko grinding. At
grinding expose the dimensions shown in Fig. 35.
To apply a special grinding machine with an electric
drive (Fig. 36).
The machine shall be equipped with a set of abrasive wheels
with cones 90, 120 and 60 *, a special set of bars,
inserted into the holes and adapted guides
dressing of abrasive wheels and inspect the chamfer beats.
Before you start grinding the bevel, it is necessary to
hole in the bush to find a set of mandrel
included in the guide bush is dense.
Submission of abrasive tools made by hand, and
grinding is carried out as long as the grinding stone is not
will remove the metal seat evenly over the entire circumference
Check the beats of the bevel axis of the aperture ratio is
on a special fixture (Fig. 37).
The device is worn on the same mandrel, which
produced grinding chamfers. The device consists
of the clutch 3, the rotating mandrel in a 5, the holder 4, the indicator 6
firmly fixed on the mandrel. Clutch 3
is on top of a conical surface on which
slip rod indicator stalk, and the lower conical
surface of the sleeve is inserted into the opening two special
Tip 1. When turning the hand clutch three point one
moves over the surface of the working bevel seat, and in the presence
beats yzyvaet axial movement of the coupling, which
transferred to the scale of the indicator.
The values allowed for the beat facets seaxtexhaust and intake
valves shall noxtexceed 0.05 mm.
To measure the beats of facets saddles intake and exhaust valves
requires coupling with a different arrangement of terminals, as
diameters of the valve heads and facets are different.
Convinced of the chamfer concentricity, provertn width and location
position on the bevel surface of the ground
the valve head and seat. This check Delight as follows:
- Put on the valve seat a thin layer of paint;
- Insert into the corresponding guide sleeve valve.
Then crank the valve, pressing it to the saddle.
It is believed that the valve sits well in the saddle, if the resulting
at the head of the valve is located in the middle belt of paint bevel
and the width of the belt is in the range 1.6-2.2 mm for
Intake and exhaust valve.
If these requirements are not met, it is necessary
further polish the valve seat. At the same grinding
tool should have an angle of 60 * in the top or in 120 *
bottom, depending on where you want to move the
operating the valve seat chamfer.