Repair - continued - TM-10-3930-673-340152

TM 10-3930-673-34

3-7. CYLINDER HEAD ASSEMBLY REPLACEMENT/REPAIR (CONT)

(j)

Stamp two X's on side of cylinder

head in line with pocket with service

seat.

TR00622

(7)

Machine parent metal exhaust valve

seat pockets and install exhaust.

Valve seats marked with one X at side of

cylinder head have been ground once and

if regrinding is necessary, install service

seat.

(a)

Machine parent metal intake valve

seat pocket to dimensions shown.

(b)

Install exhaust valve service seats

the same way as described for the

intake service seats (see Steps (5)(b)

through (6)(j) above).

NOTE

If it can not be accurately

determined that service valve seats

have been ground only once after

initial installation, replace seat.

TR00628

(8)

Grind valve service seat(s). Grind

service seats (15) for a few seconds

only to avoid making them too wide

to fit in cylinder head (2).

(a)

Valve seats marked with two X's on

cylinder head have service seats

installed. Service seats, like the

parent metal seats, can only be

ground once after initial

installation.

(b)

Grind service seats the same way, and to same tolerances, as used for grinding integral seat in

Step (4) above.

3-50