Engine & Running Gear; Air Intake System Inspection - Blue Bird D3RE 2014 Driver's Handbook Manual

ENGINE & RUNNING GEAR

Air Intake System Inspection

Intake air must be filtered to prevent dirt and debris from entering the engine
and causing premature wear. Air intake piping should be checked daily, as should
charge-air piping and engine air cleaner service indicator. Repair any leaks in the
system before operating the bus. Never operate the engine without an air cleaner or
with disconnected or loose piping.
Intake Air Restriction Indicator
Some engines are equipped with a gauge which displays the difference in air pres-
sure before and after the air cleaner. As the air cleaner element becomes dirty, the
pressure differential rises. If your engine is equipped with a different type of service
indicator, follow the manufacturer's recommendations to service the indicator.
[CAUTION] Leaks in the intake system will prevent the Air Restriction Indica-
tor from reading accurately. Always check the piping for leaks, especially
between the indicator and the engine intake.
Maximum intake restriction (clean air filter element): 10.0 inches water (254 mm)
Maximum intake restriction (dirty air filter element): 25.0 inches water (635 mm)
Cummins. Replace the engine air cleaner every 12 months, or when the air cleaner
service indicator shows restriction of 25 inches of water. Do not rely completely on
the restriction indicator. A leak in the system will prevent the restriction indicator
from operating properly. Always look at the piping to ensure there are no leaks.
Air Intake Piping
Inspect the intake piping daily for wear points and damage to piping, loose clamps,
or punctures that can cause damage to the engine. Replace damaged pipes, and
tighten loose clamps; replace if necessary, to prevent the air system from leaking.
Check for corrosion under the clamps and hoses of the intake system piping. Corro-
sion can allow corrosive products and dirt to enter the intake system. Disassemble
and clean as required.
Charge Air Piping
Inspect the charge air piping and hoses daily for holes, cracks, or loose connections.
Tighten the hose clamps as necessary.
Charge-Air Cooler (CAC) Maintenance
Check this system every 3 months or 7,500 miles. Inspect the charge-air cooler (CAC)
for dirt and debris blocking the fins. Check for cracks, holes, or other damage. If dam-
age is found, refer to your Blue Bird Dealer.
108
DRIVER'S HANDBOOK
Air Restriction Indicator at
Air Intake Filter Element