CYLINDER HEAD REPAIR (CONT) -726030064

TM 9-2320-360-34-2

NOTE

If new valves and valve seats are

being used, do steps (20) thru (28)

before continuing with step (13).

(13) Lightly coat valve face ( 1) with Prussian blue

dye.

NOTE

Do not rotate valve when performing

steps (16) thru (19).

(14) Lower stem of valve (12) Into valve guide (2)

and let valve (12) drop against valve seat insert

(8).

(15) Push up on stem of valve (12) until valve face

(11) Is about 1 in. (2.543 cm) above valve seat

Insert (8).

(16) Release stem of valve (12) while applying

downward pressure against head of valve

(12) until valve face (11) makes contact with valve

seat insert (8).

(17) Repeat steps (15) and (16) several times to get

good imprint in Prussian blue dye.

(18) Remove valve (12) using care to avoid smearing

Prussian dye.

(19) Inspect contact surface (13). Imprint in Prussian

blue dye should have an even seat mark all the

way around the center of valve face (11).

NOTE

Do steps (20) thru (28) to reface

valves and valve seat Inserts if parts

are new or pitted, or an uneven

imprint was obtained.

(20) Use 31 degree grinding wheel and grinder on

valve seat insert (8).

(21) Use 60 degree grinding wheel to open throat of

valve seat insert (8).

(22) Grind contact surface (13) of valve seat insert

(8) with a 15 degree grinding wheel to narrow

width of seat from 5/64 in. (1.984 mm) to 3/64

in. (1.91 mm).

(23) Valve (12) must be refaced at a 30 degree

angle. Valve head thickness (14) must be no

less than 0.031 in. (0.79 mm).

19-49