TM-9-2320-273-34

TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1980

TM-9-2320-273-34 - Page 562 of 801

TM9-2320-273-34

(12.32

(2) Check the exhaust valve seat height (fig. 14-12). If the height is less

mm), discard the seat.

than 0.485 in.

Figure 14-12,

TA 074368

Check Exhaust Valve Seat Height.

(3) Check the intake valve seat height (fig. 14-13). If the height is less than 0.270 in.

(6.87 mm), discard the seat.

TA 074369

Figure 14-13. Check Intake Valve Seat Height.

(4) Apply bluing to the exhaust and intake valve seating surfaces to check the seats. If the

seating surfaces are not 100 percent true, they may be lapped. If lapping will reduce the valve seat height

beyond wear limits, discard the valve assembly.

(5) If lapping is necessary to acquire a good valve seat:

(a) Apply bluing to the surface of the exhaust valve to be lapped, and allow to dry.

(b) Apply lapping compound (items

27

and 28, App B) (a half-and-half mixture of

38900A and A-600) to the exhaust valve and place the valve on the seat.

14-15