Chrysler 1991 - EMISSION CONTROL SYSTEMS; EXHAUST EMISSION CONTROLS; AIR INLET-DIESEL ENGINE; AIR INTAKE HEATER-DIESEL ENGINE

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EMISSION CONTROL SYSTEMS 25 - 1
EMISSION CONTROL SYSTEMS
EXHAUST EMISSION CONTROLS
AIR INLET-DIESEL ENGINE
The diesel engine air inlet system consists of the:
• air cleaner housing
• filter element
• air cleaner to turbo-charger inlet tube
• air crossover tube
• air intake heaters
Ambient air enters the air cleaner housing through
an opening at the bottom of the housing (Fig. 1). Air
in the housing is filtered by the air cleaner element
(Fig. 2) before it is drawn into the turbo-charger.
Fig. 2 Air Filter Element
The turbo-charger increases the amount of air flow
to the engine. The turbo-charger allows the engine to
use a higher air-to-fuel ratio. This results in im-
proved emissions.
Air flows from the turbo-charger into the inter-
cooler (Fig. 3). Air leaves the inter-cooler, passes
through the air intake heaters and enters the intake
manifold.
TURBOCHARGER TURBOCHARGER
INTERCOOLER J9114-238
Fig. 3 Diesel Inter-Cooler
AIR INTAKE HEATER-DIESEL ENGINE
The air intake heater warms intake air before it
enters the manifold. If intake manifold air tempera-
ture is below 16°C (60°F) the engine controller will
energize the heaters through the air intake heater
relays for startup and initial warmup. Refer to Group
14, Fuel Systems in this supplement for Air Intake
Heater operation.
The heater is located on top of the intake manifold,
below the air crossover tube (Fig. 4).
CAUTION: Do not energize the air intake heater re-
lays more than once per 15 minutes. If the relays
are cycled and the key is then turned off, wait 15
minutes before turning the key to the ON position.
The 15 minute period is to prevent damaging the
engine.