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 TM 55-1905-223-24-3
(c) Use the valve guide mandrel to install the valve guide. Be sure that the height of the valve guide is 1.270 to
1.280 inch (32.26 to 32.51 mm) after it is installed.
(d) Use a new valve to check the inside diameter of the guide. Insert the valve in o the guide. The valve stem
t
must move freely.
(e) If the valve does not move freely in the guide, use the valve guide reamer to ream the guide.
(f)
Use a drill press that has a floating tool holder to ream the valve guide. Install the reamer in the drill press.
(g) Apply lubricating oil to the reamer while the guide is being reamed.
(h) Do not ream the inside diameter of the guide larger than 0.4532 inch (11.511 mm).
f. Valves. Inspection, grinding and replacement.
(1) Visually inspect the valves as follows:
(a) Clean the valves and polish with fine crocus cloth.
(b) Check the valve head for damage. Measure the thickness of the valve head rim (A, Figure 4-11). The rim
must measure a minimum of 0.105 inch (2.67 mm).
(c) Measure the outside diameter of the valve stem. Discard the valve if the stem is damaged or measures less
than 0.449 inch (11.44 mm).
(d) Check the grooves in the valve stem for wear. The valve spring retainer lock must fit tightly in the grooves.
Discard the valve if the grooves are worn enough that the lock is loose.
(2) Valve grinding.
(a) Use a valve facing machine to grind the face of the valve. Check the setting of the facing machine by using a
new valve and an indicator gauge.
(b) Put the valve to be ground in the chuck of the machine. Tighten the chuck on the guide area of the valve
stem.
(c) Position the tip of the indicator against the valve face.
(d) Turn the valve. Put a mark on the valve face where the indicator shows the highestreading.
(e) Remove the valve from the chuck.
(f)
Turn the valve 180 degrees from the original position in the chuck.
(g) Put the valve in the chuck and tighten the chuck.
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