TM 5-3895-382-24
(8)
Diameter of the inlet valve ...................42.88 to 43.12 mm
...............................................................(1.688 to 1.698 inch)
Valve depth below the cylinder head face
Minimum ..............................................1.40 mm (.055 inch)
Maximum .............................................1.70 mm (.067 inch)
Service wear limit................................1.95 mm (.077 inch)
(9)
Inlet valve
Naturally aspirated engine
Valve face angle................................................. 45 degrees
Valve seat angle ................................................ 46 degrees
Turbocharged engine
Valve face angle................................................. 30 degrees
Valve seat angle ................................................ 31 degrees
(10)
The valve lash is the following value when the engine is
hot or cold:
Inlet valves ...........................................0.20 mm (.008 inch)
Exhaust valves.....................................0.45 mm (.018 inch)
Illustration 16
Recess for a valve inset
(11)
Machine the recess in the head for vale seat inserts to
the following dimensions:
Inlet
(A) ........................................................10.585 to 10.715 mm
(0.4167 to 0.4219 inch)
(B) ........................................................45.535 to 45.560 mm
(1.7927 to 1.7937 inch)
(C) Maximum radius ..........................0.38 mm (.015 inch)
Exhaust
(A) ........................................................10.585 to 10.715 mm
(.4167 to .4219 inch)
(B) ........................................................43.535 to 43.560 mm
(1.7140 to 1.7150 inch)
(C) Maximum radius ..........................0.38 mm (.015 inch)
NOTE: When a new valve seat insert is installed, a new
valve and valve guide must be installed. Refer to
Disassembly and Assembly for removal and
installation procedures.
Illustration 17
Angles an dimensions of the valve seat insert.
(12) Valve seat insert
(D) Included angle of the faces
(E) Dimension of chamfer
(F) Vertical angle of chamfer
(12)
Valve seat insert
(D) Included angle of the faces of the valve seat
insert
Naturally aspirated engine ....................... 88 degrees
Turbocharged engine .............................118 degrees
(E) Dimension of chamfer for all
engines ................................................1.10 ± 0.20 mm
(.043 ± .008 inch)
(F) Angle of chamfer from the vertical for all
engines ........................................................ 30 degrees
Cylinder Head
SMCS Code: 1100
Type 1 Engines and 9RM Engines
NOTE:
For a complete description of Type 1 and Type 2
engines, refer to the Specifications Module,
"Engine Design" for more information.
5-16
