Engine cranks but will not start (no smoke from exhaust)-cont.

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Engine cranks but will not start (no smoke from exhaust).

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

Figure 2-9. Priming Plug

TM 55-1905-223-24-5

Table 2-2. Troubleshooting-CONT

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

NOTE

Make sure the coil wires are not connected before checking the solenoid resistance.

(5)

Check the solenoid resistance with a volt-ohm meter.

(6)

The solenoid resistance at 24 Vdc should be 28-32 Ohms.

(7)

If resistance is not 28-32 Ohms, replace solenoid (para. 2-33).

STEP 2.

Check fuel flow to injectors. Loosen fuel line between fuel pump and cylinder head while

cranking engine, check for fuel.

STEP 3.

Check for loose fuel connections on suction side of fuel pump. Secure all fuel filter

fittings and connections from fuel tank to fuel pump.

STEP 4.

Check for plugged fuel filter or suction line restriction.

Replace fuel filter, refer to PMCS Table 2-1, Item 11.

Remove fuel supply hose to fuel pump and install a vacuum tester between the pump

and supply line.

Hold tester at the same level as the gear pump (para. 2-33).

Run the engine and observe the reading on the tester.

Maximum reading should be 4 in. Hg clean filter, 8 in. Hg dirty filter.

Remove gauge and connect supply line.

Check fuel drain line restriction; maximum restriction is 6.5 in Hg. Replace drain line

STEP 5.

Check for fuel in pump as follows:

NOTE

Loosen the fuel line at the solenoid shutoff valve while the engine is cranking. If fuel

does not come out of the connection, the pump must be primed.

If fuel pump is dirty, clean the outside of the pump.

Remove the priming plug (FIGURE 2-9) from the top of the housing.

Change 2

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