5.9.5. Grinding in of valves
Grinding in of valves is carried out on the removed head of the block of cylinders. For extraction of valves from the directing plugs of a head of the block of cylinders it is necessary to remove springs of valves, having squeezed them special adaptation and having taken out from plates of springs crackers (see. "Replacement of oil scraper caps"). 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. 5.7. Device for grinding in of valves: 1 – metal core; 2 – rubber hose; 3 – screw collar
In the absence of ready devices it is possible to use adaptation manufactured according to 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 sidewall the through carving opening in which will screw a bolt for fixing of a core of the valve is executed.
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.
In the absence of any adaptation it is possible to grind in the valve 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), at the same time on a valve saddle after grinding in the opaque gray corbel of the corresponding size also has to appear.
7. After grinding in carefully wipe the valve and a saddle with 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: apply a thin film of graphite of a pencil slate pencil on a valve head facet, insert the valve into the 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 install 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 within 3 min. kerosene does not filter into the combustion chamber, the valve is tight.