Figure 5-18. Testing Valve Spring

Figure 5-19. Checking Valve Face Runout

Figure 5-18. Testing Valve Spring

f. Check cylinder head for flatness by placing a

straightedge across cylinder head in several

directions as shown in figure 5-21, and measuring

gaps under straightedge with feeler gage. Cylinder

head must be flat within 0.005 inch.

g . Clean valve guides using electric drill and

carbon cutter as shown in figure 5-22. Check valve

guides against specifications of Table 5 to

determine if they must be replaced.

5-31. VALVE GUIDE REPLACEMENT. If valve

Figure 5-20. Checking Valve Seat Runout

guides are worn oversize, they must be replaced as

press. DO NOT DRIVE GUIDE INTO PLACE

follows:

USING A HAMMER; DAMAGE TO GUIDE WILL

a. The old valve guide may be removed by driving

RESULT IN DOING SO. Make sure guide is

guide from head using an appropriate driving tool.

extended above head as specified in Specifications

of Table 5.

b. To insert the new guide, select an installation

d. Ream valve guide only if necessary to remove

high spots and burrs by the use of a valve guide

tool of correct size to prevent damage to the guide,

r e a m e r (high spots sometimes occur when new

and position in place. See figure 5-23.

guides are pressed in head). See figure 5-24.

c . Press guide into place using an appropriate

5-21