SECTION 01: ENGINE
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
19
FIGURE 16: CHECKING BUSHING WEAR
3. If bushing wear is suspected, remove the
tensioner. Inspect the tensioner for any
signs of wear. Check for bearing noise as
well as metal to metal contact between the
arm and spring case which is a sign of
bushing wear. Check for cracks in the
tensioner body.
4. Replace the automatic belt tensioner if found
defective.
5. Record the results of the inspection.
3.3 BELTS AND IDLERS VISUAL
INSPECTION
1. Inspect drive belts for cracks, frayed
material, missing chunks in the belt,
abrasion and peeling. Replace belts if
damaged.
2. Visually inspect all idlers for signs of
deterioration, loose fasteners, etc.
3. Record the results of the inspection.
MAINTENANCE
Visually inspect belts and idlers for signs of
deterioration, cracks, frayed material every
6 000 miles.
4. ENGINE PROTECTION STRATEGY
The engine protection system will automatically
derate or derate and stop the engine when
certain engine conditions reach a critical stage.
In the event of a serious fault, the red STOP
telltale light comes on and an audible alarm will
sound if the engine is running.
Prior to an actual automatic shutdown, the
engine will automatically derate, go to idle, and
then stop in 30 seconds.
ENGINE PROTECTION LOGIC (with yellow
CHECK or red STOP telltale light)
High engine coolant temperature
Shutdown
High engine oil temperature
Shutdown
Low engine oil pressure
Shutdown
High crankcase pressure (rate of
change)
Shutdown
Low coolant level
Derate
only
High intake manifold air temperature
Derate
only
High transmission oil temperature
Derate
only
High temperature of cooled exhaust
gas (EGR) - after EGR cooler
Derate
only
EGR valve and position error
Derate
only
Variable Geometry Turbo (VGT)
valve and position error
Derate
only
High VGT actuator temperature
Derate
only
High pre-Diesel Oxidation Catalyst
(DOC) temperature
Derate
only
High Compressor Discharge
Temperature (CDT – measured)
Derate
only
High soot load
Derate
only
High Diesel Particulate Filter (DPF)
pressure differential (DP)
Derate
only
OUTSIDE ENGINE PROTECTION LOGIC (no
yellow CHECK or red STOP telltale light)
High altitude (ensures that high
compressor discharge temp. is never
reached)
Derate
only
Turbo over-speed
Derate
only
Low coolant temperature
Derate
only
Crank sensor failure
Derate
only
High crankcase pressure - Absolute
Pressure
Shutdown
