Figure 3-83. Fuel injector Tube Installation

TM 10-3930-634-34

(h) After a valve seat insert runout within the

desired limits is obtained, determine the position of

the contact area between the valve and the valve seat

insert. Apply a light coat of Prussian Blue, or similar

paste to the valve seat insert. Next, lower the stem of

the valve in the valve guide and bounce, but do not

rotate the valve on the insert. This procedure will indi-

cate the area of contact on the valve face. The most de-

sirable area of contact is the center of the valve face

and is 3/64 inch to 5/64 inch wide (fig. 3-81).

(i) The 30 valve seat insert face may be ad-

justed, relative to center of valve face, by using 150

and 600 grinding wheels to dress the insert top or open

the insert throat.

(j) After the valve seat inserts have been