ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
DIRECT SUPPORT MAINTENANCE PROCEDURES
DIESEL ENGINE
Cleaning, Inspection, and Replacement:
1. Using a soft brass brush, clean carbon off the valves, valve seats, and cylinder head combustion
surface. Take care not to scratch or damage any of the surfaces.
2. Inspect the valves, valve seats, and valve head combustion surface for cracks or other damage.
3. Inspect the valve stems and seating surfaces for distortion or damage. If either valve is distorted
or damaged, replace it.
4. Replace the cylinder head if it is cracked or if the valve seats or valve head combustion surface
are damaged.
5. Check the outside diameter (O.D.) of both valve stems with a micrometer (see Figure 3).
Replace a valve if its O.D. is 0.213 in. or less.
Figure 3. Checking Valve Stem O.D.
6. Check the valve sinkage using a depth micrometer (see Figure 4). Replace a valve if its sinkage
is 0.047 in. or greater.
Figure 4. Valve Sinkage Measurement.
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