Chevrolet 4500HD Series 2019 Manual page 336

maintenance intervals and may
cause a problem with engine
durability.
(3) Refer to "Air Cleaner Indicator
Light" under Engine Air Cleaner/
Filter 0 253.
(4) Initial check at 1 040 km
(650 miles) is required.
(5) Be sure to discard used grease
seal, and always use new grease
seal for installation.
Explanation of Complete
Vehicle Maintenance Schedule
The following is a brief explanation
of each of the services listed in the
preceding Complete Vehicle
Maintenance Schedule.
1. Engine Noise : These
components have an effect on the
control of noise emissions.
Service Interval
Engine
Every 16 000 km (10,000 miles)
Cooling System
Every 16 000 km (10,000 miles)
Air intake system
Every 24 000 km (1,500 miles)
Exhaust system
Every 16 000 km (10,000 miles)
Cab
Every 16 000 km (10,000 miles)
2. Valve Lash : Incorrect valve
clearance will result in increased
engine noise and lower engine
output, thereby adversely affecting
engine performance. Retorque
Service and Maintenance
Maintenance procedure
Inspect sound absorption materials for
tears, broken out sections or
attachment. Repair or replace as
necessary.
Inspect fan, shroud and radiator for
attachment, tears or cleanliness.
Replace as necessary.
Inspect all ducts, hoses and intake
silencers for leaks or chafing. Repair or
replace as necessary.
Inspect silencer, pipes, gaskets, clamps
and mounting for exhaust gas leaks or
looseness. Repair or replace as
necessary.
Inspect sound absorption materials for
tears, broken out sections or
attachment. Repair or replace as
necessary.
rocker shaft bracket nuts before
checking and adjusting valve
clearance.
Check and adjust valve clearance
every 80 000 km (50,000 miles) or
12 months whichever occurs first.
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