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Group 25 Intake and Exhaust System
Troubleshooting
Troubleshooting
Air Restriction Indicator, Checking
Low restriction readings may be difficult to identify. They
can result from a damaged element gasket, ruptured
element, incorrectly installed element or a leak in the en-
gine air intake ducts and piping. When servicing the air
cleaner, make sure to check for these. A water manome-
ter may also be used to check for service. A maximum of
25 in. of water (20 in. of water measured at air cleaner
body outlet) is the limit of element service and indicates
a need for replacement.
On turbocharged engines, connect the manometer to the
air intake pipe, one to two pipe diameters upstream from
the turbocharger inlet, in a straight section of pipe. Tur-
bocharged engines should be under full load long
enough to allow the turbocharger to reach maximum
speed.
Note: Dust conditions and accumulated mileage deter-
mine the interval for replacing the air cleaner element.
The air cleaner should be inspected every 24,000 km
(15,000 miles) and replaced as necessary. The air
cleaner element should be replaced at least once a year
regardless of service or restriction indicator readings.
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