Purging Air From Cooling System; Coolant Freezing Point Test; Removing Coolant From Crankcase; Water Pump Pulley Replacement - Jeep J-10 Series 1982 Technical & Service Manual

1C-6 COOLING SYSTEMS
After refilling the system or when air pockets are
suspected, purge the cooling system of excess air.
Purging Air from Cooling System
Trapped air will hamper or stop coolant flow, or cause
burping of engine coolant out of the radiator overflow
tube.
Move the heater control to the HEAT position and the
heater temperature control to the full WARM or HIGH
position.
On vehicles without a coolant recovery system, purge
air by operating the engine (with a properly filled cool
ing system) with the radiator cap off until coolant has
completely circulated throughout the engine, or until
normal operating temperature is attained. Add coolant
if necessary, and install radiator cap.
On vehicles with a coolant recovery system, fill the
system with coolant and operate the engine with all
coolant caps in place. After coolant has reached normal
operating temperature, shut engine off and allow to
cool. Add coolant to recovery bottle as necessary.
NOTE: This procedure may have to be repeated several
times to maintain the correct coolant level at normal
operating temperature.
NOTE: With some models, it may be necessary to re
move a heater hose to provide an escape for trapped air
when filling the system.
Coolant Freezing Point Test
Check coolant freezing point, or freeze protection,
with an antifreeze hydrometer to determine protection
level.
Removing Coolant from Crankcase
If coolant leaks into the lubricating system, it will
clog the oil passages and cause the pistons to seize.
Severe damage to the engine will result. If coolant has
leaked into the lubricating system, locate the source of
the coolant leak(s), such as a faulty head gasket or
cracked block, and make the necessary repairs. After
repairing the source of the leak(s), use Jeep Crankcase
Cleaner, or equivalent, to flush engine.
WATER PUMP
A centrifugal water pump circulates the coolant
through the water jackets, passages, intake manifold,
radiator core, rubber hoses and heater core. The pump is
driven from the engine crankshaft by a V-type belt (two
belts for certain eight-cylinder engines). A single ser
pentine drive belt is used for certain six-cylinder engines
(refer to Cooling System Components chart). The water
pump impeller is pressed onto the rear of a shaft that
rotates in bearings pressed into the housing. The hous
ing has a small hole to allow seepage to escape. The
water pump seals are lubricated by the antifreeze in the
coolant. No additional lubrication is necessary.
Water Pump Pulley Replacement
(1) Disconnect fan shroud from radiator, if
equipped.
(2) Loosen all belts routed around water pump
pulley.
(3) Remove fan or Tempatrol drive attaching
screws. Refer to Fan Replacement
(4) Remove fan and spacer or Tempatrol fan and
drive. Remove shroud. Refer to Fan Replacement
(5) Remove pulley.
(6) Install pulley.
NOTE: For four-cylinder engines, the fan assembly
and pulley must beinstalled with the drive beltin posi
tion on thepulley. Tighten attaching nuts with 18foot
pounds (84N»m) torque.
(7) Position fan, spacer and shroud.
(8) Install and tighten belts. Refer to Drive Belt
Adjustments.
(9) Install fan attaching screws and tighten.
(10) Install shroud attaching screws and tighten.
Water Pump Replacement
The water pump impeller is pressed on the rear of the
pump shaft and bearing assembly. The water pump is
serviced only as a complete assembly.
NOTE: DO NOT WASTE reusable coolant. If solution
is clean and being drained only to service the cooling
system, drain into a clean containerfor reuse.
WARNING: DO NOT remove cylinder block drain
plugs or loosen radiator draincock with the system hot
and under pressure because serious burns from coolant
can occur.
Removal—Four-Cylinder Engine
(1) Drain coolant. Observe WARNING and NOTE
stated above.
(2) Remove drive belt and fan. Refer to Fan
Replacement.
(3) Disconnect lower radiator and heater hoses
from water pump.
(4) Remove attaching bolts and water pump.
Installation—Four-Cylinder Engine
(1) Scrape and clean gasket surface area on cylinder
block.
(2) Position replacement gasket.