TM 10-4320-310-143-2. CHECKING ENGINE OIL (Continued)d. If oil coating extends above top mark, loosen drain plug (1) enough to lower oil level to top mark ondipstick, then tighten drain plug (1) securely.3-3. CHANGING ENGINE OILChange engine oil after every 150 hours of operation orevery six months as follows:a. Remove drain plug (1) and drain oil from enginecrankcase. Reinstall drain plug.b. Remove oil cap and add 1.1 quarts of oil ofproper viscosity required by ambient temperature.c. Check oil level with dipstick. Reinstall oil cap.d. Check that oil cap is tightly closed.Section II. TROUBLESHOOTING PROCEDURES3-4. TROUBLESHOOTINGa. Table 3-1 lists common malfunctions which you may find during operation or maintenance of thecentrifugal pump unit or its components. You should perform the tests/inspections and corrective actions in theorder listed.b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. Ifa malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.c. Only those malfunctions within the scope of operator maintenance are listed.3-5. SYMPTOM INDEXRefer to the Symptom Index below. Locate the malfunction which is the same, or most nearly the same, as thetrouble you are having with the centrifugal pump unit. The Symptom Index lists the first page of thetroubleshooting information for that malfunction. Follow the steps one by one, and perform the corrective actionslisted.Symptom IndexMalfunctionNumberDescriptionPage1Engine hard to crank3-32Engine fails to crank3-33Engine cranks but fails to start3-34Uneven running or frequent stalling3-45Lack of power3-46Dense smoke from exhaust after warm-up3-57Unit overheats (erratic operation, lack of power)3-53-2
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