3304 VEHICULAR ENGINES
SPECIFICATIONS
TM 5-3805-263-14&P-2
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(6)
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(9)
7S7144 Spring for valves (new):
Length under test force
1.766 in. (44.86 mm)
Test force
57.7 ± 4.5 lb. (256.7 ± 20 N)
Use again minimum load at length under
test force . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46.5 lb. (207 N)
Length of spring at valve open
position
1.271 in. (32.28 mm)
Use again minimum load at valve
open position
144.4 lb. (642 N)
Free length after test . . . . . . . . . . . . . . . . . . . . . . .
2.05 in. (52.1 mm)
Outside diameter
1.386 in. (35.20 mm)
Spring must not be bent more than
.072 in. (1.83 mm)
Height to top of
valve guide
.875 in. (22.23 mm)
Diameter of valve stem
(new)
.3717 ± .0003 in (9.441 ± 0.008 mm)
Use again minimum diameter
.3704 in. (9.408 mm)
Bore in valve guide with guide installed in the head.
Minimum permissible (new)
.3723 in. (9.456 mm)
Maximum permissible (worn)
.3772 in. (9.581 mm)
Valve lip thickness:
6N9916 Exhaust Valve.
Use again minimum
.106 in. (2.69 mm)
6N9915 Intake Valve
Use again minimum
.096 in. (2.44 mm)
Diameter of valve head:
Exhaust
valves
1.896 ± .005 in. (48.16 ± 0.13 mm)
Intake
valve. . . . . . . . . . . . . . . . . . . . . . . . . 2.020 ± .005 in. (51.31 ± 0.13 mm)
Angle of valve face
29 1/4°
Depth of bore in head for valve seat
insert . . . . . . . . . . . . . . . . . . . .
.488 ± .005 in. (12.41 ± 0.13 mm)
Diameter of valve seat insert for exhaust
valve
2.0035 ± .0005 in. (50.889 ± 0.013 mm)
Bore in head for valve seat insert for exhaust
valve
2.0005 ± .0005 in. (50.813 ± 0.013 mm)
Diameter of valve seat
insert for intake
valve
2.0485 ± .0005 in. (5.032 ± 0.013 mm)
Bore in head for valve seat
insert for intake
valve. . . . . . . . . . . . . . . . . . . . 2.0455 ± .0005 in. (51.956 ± 0.013 mm)
Angle of face of valve seat insert . . . . . . . . . . . . . . . . . . . . . . 30°
(10) Maximum permissible width of valve seat
(intake and exhaust) ............................ .076 in. (1.93 mm)
Minimum permissible width of valve seat
(intake and exhaust) . . . . . . . . . . . . . . . . . . . .
.045 in. (1.14 mm)
VALVES
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Dimension from top of closed valve to face of head:
Minimum permissible dimension for 7N573 and
6N9916 Exhaust Valve . . . . . . . . . . . . . . . . . . . .026 in. (0.66 mm)
Minimum permissible dimension for
6N9915 Intake Valve . . . . . . . . . . . . . . . . . . . .
.006 in. (0.15 mm)
Outside diameter of the face of the valve seat insert:
Exhaust seat. . . . . . . . . . . . . . . . . . . . . . .
1.812 in. (46.02 mm)
Maximum permissible, exhaust seat ......... 1.862 in. (47.29 mm)
Intake seat. . . . . . . . . . . . . . . . . . . . . . . . . .
1.940 in. (49.28 mm)
Maximum permissible, intake seat . . . . . . . . 1.990 in. (50.55 mm)
Angle to grind seat face of the insert to get
a reduction of maximum seat diameter . . . . . . . . . . . . . .
15°
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