TM 9-2320-363-34-2
CYLINDER HEAD REPAIR (CONT)
15.
16.
17.
18.
19.
NOTE
Replace rotator whenever spring is replaced.
INSPECT VALVE SPRINGS AND REPLACE ANY THAT ARE PlTTED OR CRACKED.
USE SUITABLE VALVE SPRING TESTER (25) TO TEST VALVE SPRINGS. REPLACE SPRING IF
SPRING LOAD IS LESS THAN 67 LB (297 N) AT COMPRESSED LENGTH OF 2.648 IN. (67.25 mm).
NOTE
If suitable for reuse, valve may
width is not less than 0.086 in.
mm) for exhaust valves.
be refaced as long as after refacing, valve rim
(2.1 9 mm) for intake valves and 0.094 in. (2.39
MAKE SURE VALVE STEMS ARE FREE FROM SCRATCHES OR SCUFF MARKS. VALVE FACES
MUST BE FREE FROM RIDGES, CRACKS, AND PITTING. IF NECESSARY, REFACE VALVES OR
INSTALL NEW VALVES. IF VALVE FACES ARE WARPED OR VALVE STEM IS BENT, REPLACE
VALVES. MINIMUM VALVE STEM DIAMETER IS 0.342 IN. (8.679 mm).
INSPECT GUIDES FOR CRACKS, CHIPPING, SCORING, AND EXCESSIVE WEAR.
MEASURE VALVE GUIDE BORE WITH SMALL HOLE GAGE OR GAGE PIN, AND MEASURE VALVE
STEM DIAMETER WITH MICROMETER. COMPARE MEASUREMENTS TO DETERMINE VALVE
STEM CLEARANCE. IF CLEARANCE IS GREATER THAN 0.005 IN. (0.13 mm. VALVE GUIDE MUST
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