FIGURE 4-25. Valve Seat Insert Removal.

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Replace cylinder head valve guide

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

FIGURE 4-27. Valve Seat Insert Bore Measurement.

TM 55-1905-223-24-1

NOTE

Only replace the valve seat insert if it is not

within specifications (refer to steps b (25) and

(27) of this procedure).

(1) Use valve seat insert cutter to cut groove (2, FIG. 4-25). Machine a groove in the seat as close to

the bottom of the bore as possible.

(2)

Use valve seat extractor (exhaust seat or intake seat) (1, FIG. 4-25).

Use extractor knocker

assembly. Remove seat insert.

(3) Remove air flow deflectors from intake ports.

(4) Clean the valve seat insert bore. Inspect for cracks extending into the bore. Replace the cylinder

head if a crack extends into the bottom of the bore (FIG. 4-26).

FIGURE 4-25. Valve Seat Insert Removal.

FIGURE 4-26. Valve Seat Insert Bore Inspection.

4-24