TM 5-4310-393-14g.Check that each valve head diameter is not less than 1.193 inch (30.3 mm).h.Replace the cylinder head If any of the following conditions exist If the cylinder contact surface isroughened, warped, and cannot be repaired; the valve seats are so worn that recutting is no longer possible, if contactsurface for cylinder head cover is rough or damaged; or if there are cracks between the valve seatsD.Install.1.Installing the Inspected Components.a.Install pinion (Figure 5-23, Item 8) Incylinder head (9). Gear teeth go toward the inside andno-teeth area of the pinion at the bottom.b.Insert decompression shaft (7)through cylinder head (9) and into pinion (8).c.Align holes in pinion (8) anddecompression shaft (7) d Install roll pin (6).e.Install new preformed packing (5) onpin (3)FIGURE 5-23. DECOMPRESSION MECHANISMf.Install 10 spring plates (4) on pin (3). The spring plates must be installed In five sets with concavesides together to create spring action.g.Install pin (3) with assembled preformed packing (5) and spring plates (4) into cylinder head (9).h.Rotate decompression shaft (7) to horizontal position.I.Install threaded pin (2) and tighten until snug Shaft must be free to turn but not move with vibration.j.Secure lock nut (1).CAUTIONDo not scratch the cylinder headsealing surface. Scratches will causepoor sealing of cylinder head andcylinder surfaces.k.Insert valve (Figure 5-24, Item 6)into cylinder head (7).I.Install cap (5), washer (4), valvespring (3) and cup (1).m.Press down cup (1) and installcollets (2)FIGURE 5-24. REASSEMBLE VALVES5-21
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