FIGURE 4-6. Valve Stem Inspection.

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FIGURE 4-4. Cup Plug Removal.

TM-55-1905-223-24-1 Main Propulsion Engine for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

FIGURE 4-8. Valve Head Height Measurement.

TM 55-1905-223-24-1

(8) Use crocus cloth to polish the valve stems.

CAUTION

Valves can be cleaned by the bead blasting method in the head

area only. Do not allow glass bead blast to contact the stem

valve. Glass bead blast will damage the surface finish of the

stem.

(9) Check collet grooves for wear. If collet grooves show wear, as indicated in FIG. 4-6, discard the

valve.

(10) Measure valve stem outside diameter with micrometer. Verify diameter is between 0.4935

inch (12.535 mm) and 0.4951 inch (12.576 mm).

FIGURE 4-6.

Valve Stem Inspection.

(11)

Position valve on valve head checking tool so that the valve head touches the tool as shown in

FIGURE 4-7.

Valve Head Thickness Check.

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