Daewoo D1146 Maintenance Manual page 135

(2) Intake system
Check the inside of the intake system for foreign matters.
Assemble each joint on the intake duct and air cleaner securely to prevent
air leaks.
(3) Exhaust system
Check the inside of the exhaust system for foreign matters.
Be sure to use heat resisting steel bolts and nuts. Do not interchange them
with ordinary steel bolts and nuts when performing reassembly operation.
Apply anti-seizure coating to the bolts and nuts.
Assemble each joint on the exhaust pipes securely to prevent gas leaks.
4.4.7. Diagnostics and troubleshooting
Complaints
1. Excessive black smoke
2. Excessive white smoke
3. Low engine output
4. Unusual sound or
vibration
Possible causes
1) Air cleaner element clogged
2) Restrictions in air duct
3) Leakage at intake manifold
4) Turbocharger seized up and not rotating
5) Turbine blades and compressor blades coming in
contact with each other or damaged
6) Exhaust piping deformed or clogged
1) Oil leak into turbine and compressor
2) Worn or damaged seal ring due to excessive wear
of bearing
1) Gas leak at each part of exhaust system
2) Air cleaner element restricted
3) Turbocharger fouled or damaged
4) Leakage at discharge port on compressor side
1) Rotor assembly coming in contact
2) Unbalanced rotation of rotor
3) Seized up
4) Each joint loosened
130
D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
Corrections
Replace or clean
Check and correct
Check and correct
Disassemble/repair
or replace
Disassemble/repair
or replace
Check and correct
Disassemble/repair
or replace
Disassemble/repair
or replace
Check and correct
Replace or clean
Disassemble/repair
or replace
Check and correct
Disassemble/repair
or replace
Disassemble/repair
or replace
Disassemble/repair
or replace
Check and correct
Printed in Jan. 2001 PS-MMA0415-E1A