Dodge RAM TRUCK 1500 1995 Service Manual page 306

7 - 36 COOLING SYSTEM SERVICE PROCEDURES
B R
this temperature is reached, it is opening too early.
Replace thermostat. The thermostat should be fully
open (valve will stop moving) at 95°C (203°F).
If the valve is still moving when the water temper­
ature reaches 203°, it is opening too late. Replace
thermostat.
If the valve refuses to move at any time, replace
thermostat.
THERMOSTAT REMOW&L—&IESEL ENGINE
WARNING: DO NOT LOOSEN THE RADIATOR
DRAINCOCK WITH THE SYSTEM HOT AND PRES­
SURIZED, SERIOUS BURNS FROM THE COOLANT
CAN OCCUR.
HOUSING HOSE
LIFT
BRACKET
H O U S I N G
BOLTS
OUTER THERMOSTAT
SEAL
INNER
SEAL
J 9 5 0 7 - 2 2
Do not waste reusable coolant. If the solution is
clean, drain the coolant into a clean container for re­
use.
(1) Disconnect both negative battery cables from
both batteries.
(2) Remove accessory drive belt. Refer to Belt Re­
moval/Installation in the Engine Accessory Drive Belt
section in this group.
(3) Drain cooling system until coolant level is be­
low thermostat. Refer to Draining Cooling System in
this section.
WARNING: CONSTANT TENSION HOSE CLAMPS
A R E U S E D ON MOST COOLING SYSTEM HOSES.
W H E N REMOVING OR INSTALLING, U S E ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP. SUCH A S SPECIAL CLAMP TOOL (NUMBER
6094) (FIG. 42). SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS. AL­
WAYS W E A R SAFETY GLASSES W H E N SERVICING
CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 43). If re­
placement is necessary, use only an original equip­
ment clamp with a matching number or letter.
(4) Remove radiator hose clamp and hose from
thermostat housing. A special clamp tool (Fig. 42)
must be used to remove the constant tension clamps.
(5) Remove the hose clamp and check valve hose at
thermostat housing (Fig. 51).
(6) Remove the two upper generator bracket
mounting bolts (Fig. 52).
(7) Remove the upper generator mounting bracket
(Fig. 52).
(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.
Fig. 51 Thermostat Removal—5.9L Diesel
J9407-13
Fig. 52 Generator Mounting Bracket Bolts—Diesel
(11) Remove the thermostat housing, thermostat,
inner and outer seals and lift bracket (Fig. 51).
(12) Clean the mating surfaces of the thermostat
housing and the cylinder head.
INSTALLATION
(1) Install the outer seal (Figs. 51 or 53) into the
machined shoulder on the thermostat housing.
(2) Install the thermostat into the machined shoul­
der next to the outer seal. Note direction of thermo­
stat in figures 51 and 53.
(3) Position the inner thermostat seal with the
shoulder towards the thermostat housing (Fig. 53).
(4) Install thermostat, lift bracket, seals and hous­
ing to the engine as an assembly. Install and tighten
mounting bolts to 24 N-m (18 ft. lbs.) torque.