TM 5-4320-302-14
5-21.
VALVES, VALVE GUIDES, AND VALVE SEATS (CONT)
Location/Item
Action
Remarks
INSPECTION OF
VALVE SEATS
NOTE
Always use a NEW valve in making valve seat insert
ring measurements.
8.
Valve seat
Measure distance between installed valve head center
insert ring
and cylinder head seat with depth gage. Distance
should be between 0.2047 inch (5.2 mm) and
0.2323
inch (5.9 mm). If distance is less than specified,
or if
any valve seat insert rings show excessive
wear, cracks,
pitting, or improper valve seat angle (greater or less
than 45 degrees), notify general support for repair or
replacement.
INSTALLATION/REPLACEMENT
9.
Valve rotators
Install rotators on valve guides.
NOTE
Make sure valve rotator recess is on top to
accommodate springs.
5-98