TM 5-4320-302-14
6-9. VALVES, VALVE GUIDES, AND VALVE SEATS (CONT)
Location/Item
Action
Remarks
17. Valve seat
a. Inspect for nicks, burrs, or other minor dam-
insert rings
age to valve mating surfaces of installed valve
seat insert rings. Very carefully smooth out
any nicks, burrs, or other minor damage with
valve seat ring cutter No. 122302 using
holder No. 122304.
b. Check valve head/cylinder head seat clearance
with NEW valve in accordance with procedure
in step 4.
Maximum clearance is 0.2323 inch (5.9 mm).
Minimum clearance is 0.2047 inch (5.2 mm).
If maximum clearance is exceeded, replace valve
seat insert rings again. Follow procedure as de-
scribed in step 11. If clearance is below minimum,
remachine valve seat insert rings with valve seat
ring cutter No. 122302 and holder No. 122304.
Reconfirm that clearance falls within limits
after remachining.
NOTE
If remachining will cause either limit to be exceeded, replace valve
seat insert rings or valves, respectively.
6-59