Chrysler RAM TRUCK 2500 1994 Service Manual page 287

7 - 32 COOLING SYSTEM
•
(2) Drain cooling system until coolant level is be­
low thermostat. Refer to Draining Cooling System i n
this group.
(3) - Remove the two support rod mounting bolts
and remove support rod (intake manifold-to-genera­
tor mount) (Fig. 48).
Fig. 48 Support RodS.OL V-10 Engine
WARNING: CONSTANT TENSION H O S E C L A M P S
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, U S E ONLY
T O O L S D E S I G N E D F O R SERVICING THIS T Y P E O F
CLAMP, SUCH A S S P E C I A L CLAMP T O O L (NUMBER
6094) (FIG. 43). SNAP-ON CLAMP T O O L (NUMBER
HPC-20) MAY B E U S E D F O R L A R G E R C L A M P S . A L ­
WAYS W E A R S A F E T Y G L A S S E S WHEN S E R V I C I N G
CONSTANT TENSION C L A M P S .
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 44). If re­
placement is necessary, u s e only an original equip­
ment clamp with a matching number or letter.
(4) Remove upper radiator hose clamp. Remove up­
per radiator hose at thermostat housing.
(5) Disconnect the wiring connectors at both of the
sensors located on thermostat housing.
(6) Remove six thermostat housing mounting bolts,
thermostat housing, gasket and thermostat (Fig. 49).
Discard old gasket.
INSTALLATION
(1) Clean mating areas of intake manifold and
thermostat housing.
(2) Check the condition (for tears or cracks) of the
rubber thermostat seal located i n the intake manifold
(Figs. 47 or 49). The thermostat should fit snugly
into the rubber seal.
I f seal replacement is necessary, coat the outer
(metal) portion of the seal with Mopar® Gasket
TEMP. C O O L A N T
RUBBER LIP SEAL J9407-16
Fig. 49 Thermostat—8.0L V-10 Engine
Maker. Install the seal into the manifold using Spe­
cial Seal Tool number C-3995-A with handle tool
number C-4171.
(3) Install thermostat into recessed machined
groove on intake manifold (Fig. 49).
(4) Install gasket on intake manifold and over
thermostat (Fig. 49).
(5) Install housing-to-intake manifold bolts.
Tighten bolts to 25 N-m (220 in. lbs.) torque.
CAUTION: Housing bolts should be tightened
evenly to prevent damage to housing and to pre­
vent leaks.
(6) Connect the wiring to both sensors.
(7) Install the upper radiator hose and hose clamp
to thermostat housing.
(8) Install support rod.
(9) Fill cooling system. Refer to Refilling Cooling
System i n this group.
(10) Connect negative battery cable to battery.
(11) Start and warm engine. Check for leaks.
THERMOSTAT OPERATION—5.9L DIESEL
ENGINE
The thermostat controls the operating temperature
of the engine by controlling the amount of coolant