Isuzu C-240PW-28, Technical Manual, Page: 33 / 235

ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
Table 3-2. Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9.
LOW OIL PRESSURE.
Step 1. Check for improper grade of oil.
a. Refer to end item lubrication order. If proper grade of oil, do step 2.
b. If improper grade of oil, refer to end item maintenance manual and change oil and filter.
Check for engine running hot.
a. Refer to Engine Overheating, Malfunction 7, in this table.
b. If not running hot, do step 3.
Check for defective relief valve.
step 2.
step 3.
Step 4.
Step 5.
Step 6.
a. Test oil pressure relief valve. Refer to paragraph 3-15.3. If setting is normal, do step 4.
b. Replace defective relief valve. Refer to paragraph 3-15.
Check for clogged oil pump strainer.
Remove and clean strainer. Refer to paragraph 3-18. If not clogged, do step 5.
Check for defective oil pump.
a. Remove and inspect oil pump for defective parts. Refer to paragraphs 3-18.1 and 3-18.2.
If not defective, do step 6.
b. Replace oil pump. Refer to paragraph 3-18.
Check for worn rocker arm bushings.
a. Replace rocker arm bushings. Refer to paragraph 3-26.
b. Remove and inspect rocker arm bushings. Refer to paragraphs 3-26.1 and 3-26.3. If not
worn, replace engine.
10. EXCESSIVE FUEL CONSUMPTION
Step 1.
Step 2.
Step 3.
Step 4.
Check for leak in fuel system.
a. Check fuel system for leaks. If no leaks, do step 2.
b. Repair fuel system.
Check for blocked air intake system.
Remove blockage as found. If no blockage is found, do step 3.
Check for defective fuel injector.
a. Remove, clean, and test fuel injectors. Refer to paragraph 3-10. If not defective, do step 4.
b. Replace fuel injectors. Refer to paragraph 3-10.
Check for improper fuel injection timing.
a. Check fuel injection pump timing. Refer to paragraph 3-13.1. If fuel injection timing is correct,
do step 5.
b. Adjust fuel injection pump timing. Refer to paragraph 3-13.2.
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