TM 5-3805-248-23-2
VALVES AND SPRINGS MAINTENANCE - CONTINUED
0263 00
REPAIR
1.
Use grinding machine, grind intake valves lightly. Grind at 29 degree angle.
2.
Using grinding machine, grind exhaust valves lightly. Grind at 44 degree angle.
CAUTION
Removal of guide from cylinder head will cause destruction of guide. Remove guide only if inspection
proves necessary.
3.
Inspect 24 guides (5) inside bore of cylinder head. Replace if cracked, broken, out of round or scored.
4.
Use valve guide gage to measure guide bore in three places. Replace guide (5) if measurement exceeds 0.3755 in. (9.53
mm).
5.
Use bushing and driver and hammer to remove and discard guide(s) (5) by driving from bottom of cylinder head.
WARNING
Use gloves or tongs to handle extremely cold parts, such as those which have been chilled in ice. Contact
between cold parts and your skin may cause frostbite and other injury.
6.
Use ice to lower temperature of new guide(s) (5).
5
7.
Use bushing and driver and hammer to install new
guide(s) (5), if removed. Drive new guide(s) in from
top of cylinder head. Height from top of new guide(s)
to cylinder head must be between 1.24 and 1.30 in. (31
to 33 mm).
8.
Use honing group to hone new guide(s) (5) to a
smooth finish.
CYLINDER
HEAD
6
7
394-615
9.
Measure inside diameter of new guide(s) (5). Inside diameter should be between 0.3725 and 0.3745 in. (9.46 to 9.51
mm) after installation of new guide(s).
10.
Inspect 12 intake valve seats (6) and 12 exhaust valve seats (7) on bottom of cylinder head. Replace if cracked, broken,
scored or burned.
0263 00-3
