TM 5-3805-261-34
ENGINE MAINTENANCE.
3-13.
Valves. (Sheet 4 of 8)
TESTING
Using valve spring tester, test springs (3,
Figure 3-67). Length of spring (3) under
test force of 57.6 lbs must be 1.77
inches. Free length after test must be
2.05 inches.
REPAIR
NOTE
The following is a maintenance repair
procedure of one exhaust and one
intake insert. The maintenance repair
procedure of the remaining three
exhaust and three intake inserts is
identical.
1.
Grind four exhaust inserts (6) and intake
inserts (7, Figure 3-50). Angle of four exhaust
inserts (6) and intake inserts (7) is 30 degrees.
To reduce maximum seat angle, grind seat
face to 15 degrees, if necessary.
NOTE
Valves must be marked and assigned to
the insert valve recess from which they
were measured.
2.
Measure four exhaust inserts (6) and intake
inserts (7) and valve recess. Minimum
dimension below combustion surface of four
exhaust valves (8) is 0.026 inch and minimum
dimension for four intake valves (9) is 0.006
inch.
Figure 3-67.
Go to Sheet 5
3-81
