TM 9-2320-289-34
Table 2-1, Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
27. NOTICEABLE LOSS OF POWER
Step 1.
Check fuel injector pump timing. (See paragraph 3-44)
Step 2.
With engine running, check for compression leaks at all fuel injector nozzles and
glow plugs.
Tighten any leaking glow plugs to 10 Ib, -ft. (14 N.m). Tighten any leaking fuel
injector nozzles to 50 Ib, -ft. (68 Nom). Repeat check. If leaks are still found,
replace glow plug (see TM 9-2320-289-20) or fuel injector nozzle gasket (see
paragraph 3-5).
Step 3.
Test each fuel injector nozzle. (See paragraph 3-36)
Step 4.
Test compression of each cylinder, (See paragraph 3-2)
28. HEAVY KNOCK WITH ENGINE TORQUE APPLIED
Step 1.
Check to see if flywheel is contacting torque converter cover. Check
flywheel-to-torque converter bolts for looseness.
Reposition torque converter cover if interfering with flywheel. Tighten bolts to
50 Ib.-ft. (68 N.m) if loose.
Step 2.
Inspect crankshaft pulley, fan pulley, and torsional damper for Iooseness.
Tighten crankshaft pulley or fan pulley if loose. If torsional damper is loose,
remove crankshaft pulley. Insert tool through slot in torsional damper, against
front lip of engine oil pan, to keep crankshaft from turning. Tighten bolt to
200 Ib.-ft. (271 N.m), Install crankshaft pulley. Tighten crankshaft pulley
bolts to 30 Ib, -ft. (41 Nom).
Step 3.
Check main bearing clearance. (See paragraph 3-1 4)
Step 4.
Check connecting rod bearing clearance. (See paragraph 3-1 3)
29. KNOCKS WHEN COLD, BUT CLEARS UP AFTER WARM-UP, INCREASES WITH ENGINE
TORQUE
Step 1.
Check to see if flywheel is contacting torque converter cover.
Reposition torque converter cover if interfering with flywheel.
Step 2.
Inspect crankshaft pulley, fan pulley, and torsional damper for looseness.
Tighten crankshaft pulley or fan pulley if loose. If torsional damper is loose,
remove crankshaft pulley. Insert tool through slot in torsional damper, against
front lip of engine oil pan, to keep crankshaft from turning. Tighten bolt to
200 Ib. -ft. (271 N.m), Install crankshaft pulley. Tighten crankshaft pulley
bolts to 30 Ib.-ft. (41 N.m).
Step 3.
Check fuel injector pump timing. (See paragraph 3-44)
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