Dodge RAM 1500 1998 Owner's Manual page 1541

11 - 16 EXHAUST SYSTEM
TURBOCHARGER (Continued)
Fig. 22 Measure Turbocharger Bearing Radial
Clearance
1 - FEELER GAUGE
(2) Pre-lube the turbocharger. Pour 50 to 60 cc
(2 to 3 oz.) clean engine oil in the oil supply line fit-
ting. Carefully rotate the turbocharger impeller by
hand to distribute the oil thoroughly.
(3) Install and tighten the oil supply line to 24
N·m (18 ft. lbs.) torque.
(4) Position the charge air cooler inlet pipe to the
turbocharger. With the clamp in position, tighten the
clamp nut to 11 N·m (95 in. lbs.) torque.
(5) Position the air inlet hose to the turbocharger
(Fig. 18). Tighten the clamp to 11 N·m (95 in. lbs.)
torque.
(6) Raise vehicle on hoist.
(7) Using a new gasket, install the oil drain tube
to the turbocharger (Fig. 19). Tighten the drain tube
bolts to 24 N·m (18 ft. lbs.) torque.
(8) Tighten the oil drain tube clamps to 8 N·m (71
in. lbs.).
(9) Connect the exhaust pipe to the turbocharger
and tighten the bolts to 11.3 N·m (100 in. lbs.)
torque.
(10) Lower the vehicle.
(11) Connect the battery negative cables.
(12) Start the engine to check for leaks.
CHARGE AIR COOLER AND
PLUMBING
DESCRIPTION
The charge air system (Fig. 23) consists of the
charge air cooler piping, charge air cooler and intake
air grid heater.
The charge air cooler is a heat exchanger that uses
air flow from vehicle motion to dissipate heat from
the intake air. As the turbocharger increases air
pressure, the air temperature increases. Lowering
the intake air temperature increases engine effi-
ciency and power.
Fig. 23 Intake Air Circulation
1 - CHARGE AIR COOLER
2 - AIRFILTER
3 - TURBOCHARGER
OPERATION
Intake air is drawn through the air cleaner and
into the turbocharger compressor housing. Pressur-
ized air from the turbocharger then flows forward
through the charge air cooler located in front of the
radiator. From the charge air cooler the air flows
back into the intake manifold.
DIAGNOSIS AND TESTING - CHARGE AIR
COOLER SYSTEM - LEAKS
Low turbocharger boost pressure and low engine
performance can be caused by leaks in the charge air
cooler or plumbing. Fuel staining on the exhaust
manifold can also be an indication that there are
leaks in the air system.The following procedure out-
lines how to check for leaks in the charge air cooler
system.
(1) Loosen clamp and remove air inlet hose from
turbocharger.
(2) Insert Special Tool 9022 Adapter into the tur-
bocharger inlet. Tighten tool clamp to 8 N·m (72 in.
lbs.).
DR