5.9.5. Grinding in of valves

Grinding in of valves carry out on the removed head of the block of cylinders. For extraction of valves from directing plugs of a head of the block of cylinders it is necessary to remove springs of valves, having compressed them the special adaptation and having taken out from plates of springs crackers (see. «Replacement of maslosjemny caps»). For grinding in of valves it is most convenient to use the special mechanical adaptation (a reversive drill).

Besides, on sale there are ready manual holders of the valve.

Fig. 5.7. The adaptation for grinding in of valves: 1–metal core; 2–rubber hose; 3–screw collar

In the absence of ready adaptations it is possible to use the adaptation made on the drawing (fig. 5.7).

Instead of a rubber hose and collars it is possible to weld a tip on a core of 1 adaptation, at it in a lateral wall the through carving opening in which will screw a bolt for fixing of a core of the valve is executed.

Besides, it be required to you: pritirochny paste, kerosene, a weak spring, on external diameter passing through an opening of a saddle of the valve.

1. Clear the valve of a deposit.

2. Put on a facet of the valve a continuous thin layer of pritirochny paste.

3. Put on a valve core previously the picked-up spring and insert the valve into directing plug from the combustion chamber, having greased a valve core with a layer of graphitic greasing.

Note Graphitic greasing protects directing plug from hit in its openings of an abrasive from pritirochny paste and facilitates valve rotation during grinding in.

4. Put on a valve core the adaptation for grinding in of valves (or with some tightness a rubber tube for connection of the valve with a reversive drill).

5. Having included a drill on the minimum frequency of rotation (in a reversive mode) or rotating the adaptation (in case of manual grinding in) alternately in both parties on a half of turn, grind in the valve, periodically that pressing it to a saddle, weakening effort of pressing.

Good advice In the absence of any adaptation to grind in the valve it is possible by means of a hose of suitable diameter and a collar, pressing and turning it the valve.

6. Grind in the valve before emergence on its facet of an opaque gray continuous monophonic corbel (width of 1,75-2,32 mm for inlet and 1,44–1,54 mm for final valves), thus on a valve saddle after grinding in also there should be an opaque gray corbel of the corresponding size.	7. After grinding in carefully wipe the valve and a saddle a pure rag and wash out for removal of the remains of pritirochny paste.

8. Check concentricity of an arrangement of a plate of the valve and a saddle: put on a facet of a head of the valve a thin layer of graphite of a pencil slate pencil, insert the valve into directing plug and, having slightly pressed to a saddle, turn.	9. In the wake of graphite on a facet of a saddle it is possible to judge concentricity of an arrangement of the valve and a saddle.

10. Check tightness of the valve for what establish it in a head with springs and crackers. Then put a head on one side and fill in kerosene to that canal which is closed by the valve. If during 3 mines kerosene does not filter into the combustion chamber, the valve is tight.