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Page Title:
Table 1. Engine Troubleshooting Procedures - continued |
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 TM 9-2320-361-24-1
0008 00
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
Table 1. Engine Troubleshooting Procedures (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
16. ENGINE NOISE
ABNORMAL
When abnormal engine noise is
evident, engine should be checked
and location of noise determined to
ensure engine will not be
permanently damaged.
1. If gears are loose on shafts,
1. When a knocking noise is located
tighten or replace gears
at front of engine, check camshaft
(TM 9-2815-210-34-2-1).
gear, crankshaft gear, or fuel
injection pump gear for damage,
2. If gears are worn, defective, or
excessive backlash, or loose fit.
have excessive backlash, replace
Check excessive camshaft end
engine (WP 0046 00).
play. Remove timing gear cover
3. If camshaft end play is excessive,
replace engine (WP 0046 00).
2. When a knocking noise is located
1. If valve train components are
at top of engine, remove rocker
worn or are defective, replace
arm covers (WP 0030 00) and
check valve train components
2. If valve train components are out
mounted on cylinder heads for
of adjustment, adjust
wear, defects, or incorrect
adjustment (WP 0031 00).
3. When knocking noise is located at
If valve train components are
side of engine, remove side tappet
excessively worn or defective, replace
chamber covers, valve covers,
valve train components and
tappets. Check for defects.
If noise changes, remove
4. When a knocking noise is located
transmission (WP 0131 00) and
at bottom or rear of engine, check
clutch (WP 0050 00) and check
flywheel screws for loose
flywheel screws for loose condition.
conditions. Position in neutral,
Tighten loose screws or replace
start engine, and press and
damaged or defective flywheel
release clutch a number of times.
components (WP 0029 00).
1. If bearings are worn or defective,
5. When a knocking noise is located
replace engine (WP 0046 00).
at bottom of engine, remove oil
pan, (WP 0035 00) and check
2. If crankshaft or connecting rods
condition of bearings, crankshaft
are defective or damaged, replace
and rods for wear and defects.
engine (WP 0046 00).
6. Disassemble engine and check
3. If worn or defective, replace
connecting rod wrist pins and
engine (WP 0046 00).
pistons for wear and defects.
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