5.13.5. Grinding in of valves

For grinding in of valves it is the most convenient to use special mechanical adaptation (a reversive drill).
Besides, on sale there are ready tame holders of the valve.

Fig. 5.13. Device for grinding in of valves: 1 – metal core; 2 – rubber hose; 3 – screw collars

At their absence it is possible to use adaptation manufactured according to the drawing (fig. 5.13).
Besides it will be required to you: pritirochny paste, kerosene, the weak spring which on outer diameter is passing in a valve saddle opening.
1. Clear the valve of a deposit.
2. Apply a continuous thin film of pritirochny paste on a valve facet.
3. Put on previously picked up spring a valve core and insert the valve into the directing plug from the combustion chamber, having greased a valve core with a layer of graphitic lubricant.

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

4. Put on a valve core the device 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 reverse mode) or rotating adaptation (in case of manual grinding in) alternately in both parties half way, grind in the valve, periodically pressing it to a saddle, weakening effort of pressing.
6. An external sign of satisfactory grinding in is monophonic opaque gray color of a working facet of the valve …
7. … and valve saddles in a block head.
8. After grinding in carefully wipe with a pure rag the valve and a saddle and wash out for removal of the remains of pritirochny paste. Check tightness of the valve for what install it with springs and crackers in a head. Then put a head combustion chambers up, muffle a candle opening and fill in kerosene in the combustion chamber. If within 3 min. kerosene does not filter into the canal of a head of the block, the valve is tight.