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 TM 55-1905-220-14-7
3-171.1. PISTON - MAINTENANCE INSTRUCTIONS (Continued).
9. When an engine is hard to start, runs rough or lacks power, worn or sticking compression rings may be
the cause. Replacing the rings will aid in restoring the engine to normal.
h. The compression rings may be inspected through the ports in the cylinder liners after the air box covers
have been removed. If the rings are free and are not worn to the extent that the plating or grooves are gone,
compression should be within operating specifications.
i. Excessively worn or scored pistons, rings or cylinder liners may be an indication of abnormal
maintenance or operating conditions which should be corrected to avoid a recurrence of the failure. The use of
the correct types and proper maintenance of the lubricating oil filters and air cleaners will reduce to a minimum
the amount of abrasive dust and foreign material introduced into the cylinders and will reduce the rate of wear.
j. Long periods of operation at idle speed and the use of improper lubricating oil or fuel must be avoided,
otherwise a heavy formation of carbon may result and cause the rings to stick.
k. Keep the lubricating oil and engine coolant at the proper levels to prevent overheating of the engine.
3-2877
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