TM 5-4310-393-14
b.
From cylinder head bottom, push valve guide (1) out of the cylinder head (2). Insert new valve guide
(1) into cylinder head (2). Install new valve guide by
pressing in. Minimum Inserting force is 220 lb. (100 kg)
c.
Ream the inside diameter of the
valve guide to 0.2756/0 2759 in (7 0000/7 009 mm)
using hand reamer.
d.
Repair defective cylinder head valve
seats by recutting with a 45 degree valve seat cutter.
Recut valve seats until valve seat is absolutely clean.
e.
The contact surface of the cylinder
head can be repaired by machining. Remove up to a
maximum of 0.0196 inch (0.5 mm) of metal provided the
minimum.
f.
valve
clearance
is
maintained
(Figure 5-35).
FIGURE 5-34. VALVE GUIDE
FIGURE 5-35. VALVE CONTACT POINTS
f.
Replace any valves that show head warping, burning or other damage.
g.
Replace valves that have seriously scratched or scuffed stems, or pitted, ridged, or cracked tulips,
faces, or heads.
h.
Replace valves that have a valve head diameter of less than 1.193 inch (30.3 mm).
i.
Buff out light scratches or scuff marks with 600 grit tapping and grinding compound.
j.
If the cylinder head valve seats were recut, lap the valves by using 600 grit lapping and grinding
compound. After lapping, check valve clearance.
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