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 TM 55-1905-223-24-3
Table 2-2. Troubleshooting-Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
14. Turbocharger noise.
STEP 1.
Check for incorrect turbocharger installed.
Install correct equipment (para. 2-30). Refer to TM 55-1905-223-24P.
STEP 2.
Check for intake or exhaust air leaks.
Secure or repair loose or damaged piping (para. 2-30).
STEP 3.
Check for excessive intake air restriction as follows:
a.
Install a vacuum gauge or water manometer in the intake air piping.
NOTE
The gauge adapter must be installed at a 90-degree angle to the air flow in a straight
section of pipe, one pipe diameter or 4 inches before the turbocharger.
b.
Operate the engine at full throttle and rated rpm with maximum load.
c.
Record the reading on the gauge or manometer.
NOTE
Restriction must not exceed 25.0 inches H 0 (635 cm H20).
2
d.
If the restriction exceeds specifications, do the following:
(1)
Replace or clean the air filter element (para. 2-29).
(2)
Visually inspect the intake air piping for damage.
e.
Remove the test equipment.
STEP 4.
Check for excessive exhaust restriction as follows:
a.
Install a mercury manometer in the exhaust piping.
NOTE
The gauge adapter must be installed near the turbocharger or exhaust manifold in a
straight section of pipe.
b.
Operate the engine at rated rpm and load, and record the manometer reading.
NOTE
Exhaust pressure must not exceed 3.0 inches (Hg) (7.5 cm Hg).
c.
If exhaust pressure exceeds the specifications, visually inspect the exhaust piping for damage.
2-35
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