Accessory Drive Belt; Chemical Cleaning; Cooling System Cleaning; Radiator Pressure Cap - Chrysler 1998 Voyager Service Manual

NS
CLEANING AND INSPECTION (Continued)
NOTE: It is normal for the water pump to weep a
small amount of coolant from the weep hole (black
stain on water pump body). Do not replace the
water pump if this condition exists. Replace the
water pump if a heavy deposit or a steady flow of
green/brown engine coolant is evident on water
pump body from the weep hole (shaft seal failure).
Be sure to perform a thorough analysis before
replacing water pump.

ACCESSORY DRIVE BELT

When inspecting serpentine drive belts, small
cracks that run across the ribbed surface of the belt
from rib to rib (Fig. 37), are considered normal. these
are not reasons to replace the belt. However, cracks
running along the rib (not across) are not normal.
Any belt with cracks running along the rib must be
replaced (Fig. 37). Also replace the belt if it has
excessive wear, frayed cords or severe glazing.
Fig. 37 Serpentine Drive Belt Wear Patterns

RADIATOR PRESSURE CAP

INSPECTION
Hold the cap in hand, right side up. The vent
valve at the bottom of the cap should open. If the
rubber gasket has swollen and prevents the valve
from opening, replace the cap.
Hold the cleaned cap in hand upside down. If any
light shows between vent valve and rubber gasket,
replace cap. Do not use a replacement cap that
has a spring to hold the vent shut.
Replacement cap must be of the type designed for
coolant reserve system with a completely sealed dia-
phragm spring, and rubber gasket to seal to filler
neck top surface. This design assures coolant return
to radiator.

COOLING SYSTEM CLEANING

Drain cooling system (see: Cooling System
Draining ) and refill with clean water (see: Cooling
System Refilling ). Run engine with radiator cap
installed until upper radiator hose is hot. Stop
engine and drain water from system. If water is
dirty; fill, run, and drain system again, until water
runs clear.

REVERSE FLUSHING THE RADIATOR

Drain cooling system and remove radiator hoses
from engine. Install suitable flushing gun in radiator
lower hose. Fill radiator with clean water and turn
on air in short blasts.
CAUTION: Internal radiator pressure must not
exceed 138 kPa (20 psi) as damage to radiator may
result. Continue this procedure until water runs
clear.

REVERSE FLUSHING THE ENGINE

Drain radiator (see: Draining Cooling System )
and remove hoses from radiator. Remove engine ther-
mostat and reinstall thermostat housing. Install suit-
able flushing gun to thermostat housing hose. Turn
on water, and when engine is filled, turn on air, but
no higher than 138 kPa (20 psi) in short blasts. Allow
engine to fill between blasts of air. Continue this pro-
cedure until water runs clean. Reinstall thermostat
using a new housing gasket. Fill cooling system (See
Refilling).

CHEMICAL CLEANING

One type of corrosion encountered with aluminum
cylinder heads is aluminum hydroxide deposits. Cor-
rosion products are carried to the radiator and depos-
ited when cooled off. They appear as dark grey when
wet and white when dry. This corrosion can be
removed with a two part cleaner (oxalic acid and
neutralizer) available in auto parts outlets. Follow
manufacturers directions for use.
ADJUSTMENTS
PROPER BELT TENSION
Satisfactory performance of the belt driven accesso-
ries depends on proper belt tension. Belt tensioning
should be performed with the aid of a Burroughs
gauge Special Tool C-4162. Because of space limita-
tions in the engine compartment, the use of the
gauge may be restricted. Raise the vehicle on a hoist
COOLING SYSTEM 7 - 25