TM 10-4320-315-24
4-4.
MAINTENANCE OF CYLINDER HEADS - (Cont)
(13)
If clearance exceeds 0.0024-0.0037 in. (0.06-0.095 mm) for exhaust and 0.0016-0.0028 in. (0.04-0.07
mm) for Intake, replace valve guide.
(14)
Heat cylinder head to 428°F (220°C); drive out valve guide.
(15)
Install new snap spring (6, Figure 4-1) on new valve guide (7).
(16)
Insert long end of valve guide (7) into valve guide bore from top of cylinder head (8).
(17)
Drive in valve guide (7) until snap spring (6) seats.
(18)
Allow cylinder head to cool. Ream valve guide (Figure 4-5).
d.
ASSEMBLE.
(1)
Install valves (4) in cylinder head (8).
(2)
Insert valve rotators (5) over valve stems of valves (4).
(3)
Install springs (1) on valves (4). Close coils of springs toward rotator (5).
(4)
Install spring caps (3) on springs (1).
(5)
Compress valve springs (1), install valve cones (2).
Figure 4-5. Reaming Valve Guides
4-6
