Excessive lubricating oil sludge in the crankcase

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FIGURE 2-5. Blowby Check

TM-55-1905-223-24-5 Bowthruster Engine for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

Fuel in lubricating oil

TM 55-1905-223-24-5

Table 2-2. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

STEP 9. Check for excessive blue smoke under load.

a Compare the level of blue smoke with that from another vessel with the same configuration.

b. Excessive blue smoke indicates piston rings not sealing, refer to para. 3-25.

11. Excessive lubricating oil sludge in the crankcase.

STEP 1. Check for incorrect lubricating oil, and/or incorrect (extended) oil change intervals.

Change oil (refer to LO 55-1905-223-12).

STEP 2. Check for incorrect fuel grade.

Change fuel (MIL-F-16884 (grade DFM) military marine diesel fuel).

STEP 3. Check for dirty oil filter(s).

Replace oil filter(s) (refer to PMCS Table 2-3, Item 13).

STEP 4. Check oil cooler bypass valve for malfunction.

Refer to Malfunction 7, Step 3.

STEP 5. Check for low coolant temperature below 140 (60 ).

Replace thermostat (para. 2-24);

STEP 6. Check for internal coolant leaks.

Refer to Malfunction 12.

12. Coolant in lubricating oil

WARNING

Make sure engine is cool below 120 (50 ). Bring coolant to proper level.

install, a plug in overflow tube.

CAUTION

Do not apply more than 20 psi air pressure to the tester.

STEP 1. Check cylinder liner, crevice seal, or cylinder block for leaks.

a Drain the engine lubricating oil. (LO 55-1905-223-12.)

b. Remove the lubricating oil pan (para. 2-44).

c. Use 20 psi (140 kPa) air pressure to pressurize the engine cooling system (para. 2-36).

Change 2

2-36