Operation and maintenance manual

QSB4.5 and QSB6.7 Fan, Cooling
Section 4 - Maintenance Procedures at 250 Hours or 3 Months Page 4-3
Charge-Air Piping
Maintenance Check
Inspect the charge-air piping and hoses for leaks, holes,
cracks, or loose connections. Tighten the hose clamps if
necessary. Refer to the vehicle or equipment
manufacturer's specifications for the correct torque value.
Radiator Hoses
Maintenance Check
Check all hoses for cracks, cuts, or collapsing.
NOTE: The silicone engine coolant hose will exhibit
swelling due to the elasticity of the hose.
If damage is found, replace damaged hoses. Contact your
local Cummins Authorized Repair Location.
Air Intake Piping
Maintenance Check
Inspect the intake piping daily for wear points and damage
to piping, loose clamps, and punctures that can damage
the engine.
Replace damaged pipes and tighten loose clamps, as
necessary, to prevent the air system from leaking.
Torque Value: 8 N•m [ 71 in-lb ]
Check for corrosion under the clamps and hoses of the
intake system piping. Corrosion can allow corrosive
products and dirt to enter the intake system. Disassemble
and clean, as required.
Fan, Cooling
Inspect for Reuse
WARNING
Do not rotate the engine by pulling or prying on the
fan. The fan blade(s) can be damaged and cause the
fan to fail and cause personal injury or property
damage. Use the accessory drive shaft or the
crankshaft barring tool to rotate the crankshaft.