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TM 5-4320-304-14
TM 08922A-14/1
6-2. REPAIR CYLINDER HEAD AND VALVE ASSEMBLY (Continued)
5
The cylinder 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 valve recession is maintained.
6
Replace any valves that show head warping, burning, or other damage.
7
Replace valves that have seriously scratched or scuffed stems, or pitted, ridged, or cracked tulips
faces, or heads.
8
Replace valves that have a valve head diameter of less than 1.200 inch (30.5 mm).
9
Remove slight scratches or scuff marks.
10 If the cylinder head valve seats were recut, lap the valves by using tool 604 581 00 and 600
grit lapping and grinding compound.
11 After lapping valves check valve recession.
The valve recession must not be less than 0.018 inch
mm), otherwise valve head may touch piston.
The valve recession shall be a maximum of 0.0275 inch (0.70 mm) and a
(0.45 mm).
TEST:
1
2
3
4
5
6
7
6-4
Insert valve (1) into cylinder head (2).
Install cap (3) over valve (1) stem.
Install washer (4) on cap (3).
(0.45
minimum of 0.0180 inch
Install spring (5) on washer (4).
Insert cup (6) into spring (5).
Install two collets (7) into cup (6) and over valve
(1) stem.
Press down on collets (7) and cup (6) until spring
(5) compresses and collets (7) are locked in slot in
valve (1) stem.
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