FENDT MAN D 0836 LE - Turbocharger Troubleshooting; Pre-Replacement Checks for Turbocharger Issues; Troubleshooting Excessive Oil Consumption; Troubleshooting Lack of Power

Fav 900
Engine / General system
Turbocharger, troubleshooting
B
Faults
Fav 900 chassis number 23/3001 and up
15.2.2001
2000 000003
B
a
1/2
Capitel Docu-No.
Index
Date Version
Page
Turbocharger, troubleshooting
Text-module
Before replacing the turbocharger, check the following:
Excessive engine oil consumption, lack of power and abnormal intake or exhaust noises are a frequent
cause of unnecessary turbocharger replacement.
Examination of the allegedly defective parts by the manufacturer often shows the turbocharger to be in
perfectly good working order.
To avoid this situation, the following checks must be performed :
Text-module
Excessive oil consumption
Bullet-List
● Check air filter contamination
● Check intake pipe for restricted cross section (e.g. damage, dirt)
Either are possible causes for increased oil consumption due to the higher pressure.
Bullet-ist
● Check turbocharger for external traces of oil
Excessive oil consumption of the turbocharger is due to bearing wear, quickly resulting in mechanical
damage.
Text-module
Lack of power
For satisfactory power, observe correct settings for:
Bullet-
● start of fuel delivery
● valves clearance
● engine control (at full load)
● exhaust brake (must open fully).
Bullet-List
Also check:
● Cylinder compression
● air filter contamination
● intake system for restricted cross sections and leaks
● exhaust system for damage and leaks.
If none of these checks reveal the cause of poor performance, the turbocharger has to be also checked
for:
Bullet-List
● Coking of turbine impedes easy rotation. (Axial movement may realese coking.)
● Dirt within compressor
● Damage by foreign objects
● Turbine wheel in contact with housing
Remove visible contamination of compresssor side and check bearing clearance.
Text-module
Note:
Do not damage the compressor fan wheel.
Bullet-List
Abnormal intake and exhaust noises
● Check intake and exhaust system adjacent to the turbocharger assembly. Damaged gaskets must
be replaced (can mislead to failure diagnostic of turbocharger).
● If this does not eliminate the abnormal noises, the turbocharger is to be replaced. (A turbocharger in
good condition does not generate noise!)
Text-module