Section II. TROUBLESHOOTING - TM-55-1905-217-340024

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Table 2-1. Special Tools and Equipment (Continued)

TM-55-1905-217-34 Landing Craft Mechanized; Steel; DED; Overait Length 74 Feet Mod 1 Marl VIII Navy Design LCM-8 Manual

Table 2-2. Troubleshooting

TM 55-1905-217-34

2-3. Maintenance Repair Parts

Direct and general support maintenance repair parts are listed and illustrated in TM 55-1905- 217-34P.

Section II. TROUBLESHOOTING

2-4. General

a. This section contains troubleshooting information for locating and correcting most of the operating troubles

which may develop in the landing craft. Each malfunction for an individual component, unit, or system is

followed by a list of tests or inspections which will help you to determine the probable causes and corrective

actions to take. You should perform the tests/inspections and corrective actions in the order listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions.

If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

2-5. Troubleshooting

Refer to table 2-2. This table provides troubleshooting instructions at the direct and

general maintenance levels. Refer to TM 55-1905-217-12, paragraph 3-6, for lower echelon troubleshooting.

NOTE

Before you use this table, be sure you have performed all applicable operating checks.

Table 2-2. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Propulsion Engine

Engine will not turn over.

Hand crank the engine at least one complete revolution. If the engine cannot be rotated a complete

revolution, internal damage is indicated.

Disassemble the engine to ascertain the extent of damage and the cause (para 3-13 thru 3-19)

Low cranking speed.

Step 1. Check electric starting motor

Overhaul electric starting motor (para 4-3).

Step 2. Check hydraulic starting system.

Refer to (paras 4-4 thru 4-9).

Low compression

Step 1. Check for sticking or burned exhaust valves.

Cylinder head must be removed and overhauled to correct this condition.

Step 2. Check for improper valve seating. Check for excessive valve-to-guide clearance, bent valve

guide or carbon deposits. Replace a worn or bent guide. Clean the carbon from the valve. Reface

or replace the valve if necessary (para 3-15).

Step 3. Check for a bent or broken valve. Check for contact between the valve head and the piston as a

result of incorrect valve clearance, or a defective spring. Check the valve guide, insert, cylinder

head and piston for damage. Replace damaged parts (para 3-15).

Step 4. Look for varnish deposits on valve stem. Check for a worn valve guide or excessive exhaust

back pressure. Reface the valve and insert or, if necessary, replace (para 3-15)

Step 5. Check for scored or scuffed valve stem. Check for a bent valve stem or guide, metal chips or

dirt, or for a lack of lubrication.

Clean up the valve stem with crocus cloth wet with fuel oil or replace the valve. Replace the guide.

When installing a valve, use care in depressing the spring so that the spring cap DOES NOT

scrape the valve stem (para 3-15).

Step 6. See if all valves are bent. Check for a gear train failure, or for improper gear train timing.

Refer to para 3-15 and 3-17.

Step 7. See if compression rings are worn or broken.

Overhaul cylinder and replace rings (para 3-20).

Step 8. See if blower is not functioning..

Overhaul blower (para 3-9).

No fuel or insufficient fuel

Step 1. Look for obstruction in fuel lines or filters.

Disassemble and clean out all fuel lines. Service filters and strainers. (TM 55-1905-217-12, para 4-

27).

Step 2. Check for faulty fuel pump.

Governor instability (hunting).

Check for faulty governor and/or linkage to injectors.

Repair and/or overhaul governor (para 3-4).

2-3