Blue Bird Coachworks 450 LXi, Owner'S Manual

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450 LXi Owner Manual 5-4 Generator Maintenance/Service
Rev. “C”
~ 5-4-13 ~
5-4.11 Troubleshooting
If the engine does not function properly, use the following chart to identify and correct the cause.
5-4.11.1 When it is Diffi cult to Start the Engine
Cause Countermeasures
Fuel is thick and doesn’t fl ow.
Check the fuel tank and fuel fi lter. Remove water, dirt and other
impurities.
As all fuel will be fi ltered by the fi lter, if there is water or other foreign
matters on the fi lter, clean the fi lter with kerosene. •
•
Air or water mixed in fuel system
If air is in the fuel fi lter or injection lines, the fuel pump will not work
properly. To attain proper fuel injection pressure, check carefully for
loosened fuel line coupling, loose cap nut, etc.
Loosen joint bolt atop fuel fi lter and air vent screws of fuel injection pump
to eliminate all the air in the fuel system. •
•
Thick carbon deposits on orifi ce
of injection nozzle.
This is caused when water or dirt is mixed in the fuel. Clean the nozzle
injection piece, being careful not to damage the orifi ce.
Check to see if nozzle is working properly or not. If not, install a new
nozzle. •
•
Valve clearance is wrong.
Adjust valve clearance to 0.145 to 0.185 mm (0.0057 to 0.0072 in.)
when the engine is cold. •
Leaking valves Grind valves •
Fuel injection timing is wrong
Adjust injection timing
The injection timing 16.5° before top dead center. •
•
Engine oil becomes thick in
cold weather and engine cranks
slow.
Change grade of oil according to the weather (temperature.) •
Low compression
Bad valve or excessive wear of rings, pistons and liners cause insuffi cient
compression. Replace with new parts. •
Battery is discharged and the
engine will not crank
Charge battery.
In winter, always remove battery from machine, charge fully and keep
indoors. Install in machine at time of use. •
•
NOTE: If the cause of trouble cannot be found, contact your KUBOTA Dealer.