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4-8-7-3-proverka-i-shlifovanie-sedel-klapanov.html
4.8.7.3. Check and grinding of saddles of valves
Profile of a saddle of the inlet valve
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I – new saddle;
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II – a saddle after repair |
Profile of a saddle of the final valve
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I – new saddle;
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II – a saddle after repair |
Narrowing of a facet of the inlet valve the vertical drill established on a spindle
The form of facets of saddles of valves is shown on rice. Profile of a saddle of the inlet valve and Profile of a saddle of the final valve.
On working facets of saddles (a zone of contact with valves) there should not be dot sinks. corrosion and damages. Small damages can be eliminated with grinding of saddles. At the same time it is necessary to remove as little as possible metal.
Grinding
| PERFORMANCE ORDER |
| 1. To establish a head on a support, to insert the aligning core into the directing valve plug and to put on it a spring. |
Prevention
Cores exist two various diameters: 1 – for the directing plugs of inlet valves and 2 – for the directing plugs of final valves.
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2. To establish on a spindle a conic circle for saddles of final valves or a circle for saddles of inlet valves, to fix a spindle in the grinding machine and to proshlifovat a valve saddle. |
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At the time of contact of a circle with a saddle the machine has to be switched off, otherwise there will be a vibration and the facet will be wrong.
It is recommended to a thicket to make editing of a circle diamond.
After grinding to check a beating of a working facet concerning an axis of an opening of the directing plug which should not exceed 0,05 mm.
For saddles of final valves bring width of a working facet to the sizes specified rice. A profile of a saddle of the final valve, a vertical drill (a corner 20 °) and a vertical drill with which the peening on internal diameter is eliminated. Vertical drills are put on a spindle and as well as when grinding, aligned by a core.
At saddles of inlet valves bring width of a working facet to the sizes specified rice. A profile of a saddle of the inlet valve at first having fulfilled an internal facet a vertical drill (fig. Narrowing of a facet of the inlet valve the vertical drill established on a spindle) before obtaining the size to dia. ZZ, and then a facet 20 ° a vertical drill before receiving a working facet 1,9-2 mm wide (see rice. Profile of a saddle of the inlet valve).
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