FIGURE 4-86. Driving Expansion Plugs.

TM 55-1905-223-24-4

c. Inspect coolant passages (FIGURE 4-87) for deposit build up. Excessive deposits may be cleaned in an acid

tank. Be sure cam bushings are first removed.

FIGURE 4-87. Inspecting Coolant Passages

NOTE

The block may be cleaned in a hot tank for 30 minutes using a detergent and water

solution without removing the cam bushing. Water temperature should be 190OF (880

c).

d. De-glazing makes the bore "rough" to help seat the rings. The size of the bore is not changed by proper de-

glazing.

CAUTION

New piston rings may not seat in glazed cylinder bores.

4-61