Table 2-2. Troubleshooting - CONT - TM-55-1905-223-24-40046

TM 55-1905-223-24-4

Table 2-2. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

STEP 9.

Check for a malfunctioning water pump.

Replace the water pump (para. 2-35).

STEP 10.

Check to see if fuel pump timing is correct. Bar engine to TDC. Verify the scribe marks on the injection

pump flange and the gear housing are aligned. If replacing with new or rebuilt fuel pump without scribe

marks, take up gear lash by rotating the pump opposite the direction of drive rotation (para. 2-32).

STEP 11.

Check for a malfunctioning or incorrect thermostat (para. 2-23).

WARNING

Make sure engine coolant temperature is below 120 F (50 ). Hot steam can

cause serious personal injury.

Remove the upper radiator hose from the thermostat housing.

Install a hose of the same size on the thermostat housing outlet long enough to reach a remote dry

container used to collect coolant.

Install and tighten a hose clamp on the housing outlet.

Install the end of the hose in a dry container.

Operate the engine at rated RPM for one (1) minute.

Shut the engine off, and measure the amount of coolant collected in the container.

The amount of coolant collected must not be more than 3.3 fluid ounces (100 cc).

If more than 3.3 fluid ounces (100 cc) is collected, the thermostat or thermostat seal is leaking.

Replace thermostat (para. 2-23).

STEP 12.

Check to see if fuel pump is overfueled.

Check fuel pressure and fuel rate (flow).

If pressure or rate is below specifications replace pump (para. 2-31).

12. Engine running too cold.

STEP 1.

Check to see if cold operation aids are malfunctioning or if they are needed.

Check shutters, and enclosure heaters.

STEP 2.

Check for incorrect thermostat or broken thermostat jiggle pin (para. 2-23).

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