Chrysler RAM TRUCK 2500 1994 Service Manual page 289

7 - 34 COOLING SYSTEM •
BOLTS THERMOSTAT SEAL J 9 4 0 7 - U
Fig. 52 Thermostat Remowal—5.91 Diesel
(6) Remove the two upper generator bracket
mounting bolts (Fig. 53).
GENERATOR J9407-13
Fig, 53 Generator Mounting Bracket Bolts—Diesel
(7) Remove the upper generator mounting bracket
(Fig.
53).
(8) Loosen but do not remove the generator lower
pivot bolt,
(9) Position the generator to gain access to thermo­
stat housing and housing bolts.
(10) Remove thermostat housing mounting bolts.
(11) Remove the thermostat housing, thermostat,
thermostat seals and lifting bracket (Fig. 52).
(12) Clean the mating surfaces of the thermostat
housing and the cylinder head.
INSTALLATION
(1) Install the thermostat i n the housing.
(2) Position the thermostat seal with the shoulder
towards the housing (Fig. 54).
SHOULDER J9407-12
Fig. 54 Thermostat Seal—5.9L Diesel—Typical
(3) Install thermostat, lifting bracket, seal and
housing. Tighten mounting bolts to 24 N-m (18 ft.
lbs.) torque.
(4) Position generator i n place. Tighten mounting
bolts to 24 N-m torque. Tighten pivot bolt to 43 N-m
(32 ft. lbs.) torque.
(5) Install the check valve hose and hose clamp at
thermostat housing (Fig. 52).
(6) Install accessory drive belt. Refer to Belt Re­
moval/Installation i n the Engine Accessory Drive Belt
section of this group.
(7) Connect negative battery cables to both batter­
ies.
(8) Fill cooling system and check for leaks. Refer to
Refilling Cooling System i n this group.
COOLANT
G E N E R A L I N F O R M A T I O N
The cooling system is designed around the coolant.
Coolant flows through the engine water jacket ab­
sorbing heat produced during engine operation. The
coolant carries the heat to radiator and heater core.
Here i t is transferred to the ambient air passing
through the radiator and heater core fins. The cool­
ant also removes heat from the automatic transmis­
sion fluid i n vehicles equipped with an automatic
transmission.
COOLANT PERFORMANCE
The required ethylene-glycol (antifreeze) and water
mixture depends upon climate and vehicle operating
conditions. The coolant performance of various mix­
tures follows:
P u r e Water-Water can absorb more heat than a
mixture of water and ethylene-glycol. This is for pur­
pose of heat transfer only. Water also freezes at a
higher temperature and allows corrosion.