TM 5-4320-300-14
6-9. VALVES, CAMSHAFT, AND TIMING GEARS (CONT)
Location/Item
Action
Remarks
CAUTION
Equipment damage may occur if grinding wheels make contact with cyl-
inder head. Grind valve seat inserts as true as possible.
37. Valve seat
Install a 31 degree grinding wheel in valve seat
The 31 degree face
insert
insert grinder and apply the wheel to the insert.
of the insert may be
adjustment
Remove 31 degree grinding wheel from grinder
adjusted relative to
and install a 60 degree grinding wheel. Apply
the center of the
wheel to insert to open throat of insert. Grind top
valve face with the
surface of insert with a 15 degree wheel to narrow
15 degree and 60
the seat width to a range between 0.04688 and
degree grinding
0.07813 inch (1.1908 and 1.9845 mm).
wheels.
WARNING
Severe burns, illness, or death may result if personnel fail to handle diesel
fuel properly. Observe the following precautions:
Do not inhale vapor.
Do not refuel near open flame, sparks, or excessive heat.
Be certain fuel lines and connections are secure.
Work in a well-ventilated area.
38. Concentricity
Clean the valve seat insert
check
thoroughly with VV-F-800
diesel fuel and dry it with
compressed air. Set con-
centricity dial indicator in
position and rotate it to
determine the concentricity
of each valve seat insert
relative to the valve guide.
If runout exceeds 0.002
inch (0.0508 mm), inspect valve guide for bend.
If valve guide is not bent, regrind insert.
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