Kenworth T410, Driver'S Handbook Manual

Page: 319 / 418

CAT: 8612 November 2019 Page 293
PREVENTIVE MAINTENANCE
INSPECTION AND MAINTENANCE
Use the following procedures to check the Noise Control System for sources
of noise or deterioration that results in noise. Preventive maintenance and
repair information is supplied.
Wherever other systems are involved, such as electrical or cooling,
reference is made to the applicable sections for more specific information.
Exhaust System
Check for exhaust leaks and condition of gaskets. Replace any blown
gaskets.
Check all cap-screws using a torque wrench, including those at the flanges.
Refer to the engine manufacturer’s service manual for proper tightening
sequence and torque values.
Joints and Clamps
Check for leaks, and tighten as necessary. Check for deterioration or dents
in pipes and clamps which could allow exhaust to escape.
Piping
Check exhaust piping for rust, corrosion and damage. Replace deteriorated
piping before holes appear. If piping is perforated at any point, temporary
patching or lagging is acceptable until permanent repairs can be made.
On turbocharged engines, check joints at flanges and mounting brackets
for tightness.
Mufflers
Check muffler clamps and mounting brackets for security. Check internal
baffling for security. This can be accomplished by listening for rattling
sounds while tapping the muffler with a rubber mallet or by revving the
engine up and down through its normal operating range.
Do not replace a damaged muffler with a non-genuine part, as it may affect
engine back pressure and/or noise levels, thus exceeding ADR limits.
Exhaust Extension
Check for security of mounting. The opening at the top of the tail pipe must
be facing the rear of the vehicle. Do not modify the end of the exhaust
extension in any way.