Cleaning. - TM-55-1930-208-240181

TM 55-1930-208-24

3-40. VALVES, INTAKE AND EXHAUST-Continued.

Cleaning.

(1)

Clean all parts in clean fuel oil.

(2)

Wipe off excess and allow to dry.

Inspection.

(1)

Inspect springs for pits and fractures. Place spring in spring tester and check spring compression.

Spring is bad if a load of less than 25 lbs (111 N) will compress spring to 1.80 inch.

(2)

Inspect for worn, pitted valve spring seats, and caps.

(3)

Inspect valve seats for cracks, pitting, scratches, or scuff marks.

(4)

Inspect valve face for ridges, cracks, pitting, and warping.

Repair. Repair is limited to the replacement of defective parts or refacing of valves to 30angle.

Installation.

(1)

Be sure that valve guides and valve seats are clean.

(2)

Refer to figure 3-86 and lubricate valve stem (1) with lubricating oil (item 12, Appendix C).

(3)

Use a piece of masking tape to hold valve (6) into place.

(4)

Rotate the head over onto the block of wood.

(5)

Install valve spring seat (5).

(6)

Install valve guide oil seals (4).

(7)

Install springs (3) and caps (2) into position.

(8)

Refer to figure 3-85 and install spring compressor into one of the rocker arm bracket bolt holes.

(9)

Compress spring (3) and install both halves of valve lock (1).

(10) Remove spring compressor.

(11) Refer to figure 3-87 and check the valve position.

(12) Give the end of the valve stems a sharp tap with the end of a plastic mallet to aid in seating the valve

locks.

3-144