Applications And Basics Of Testing - Mityvac MV4530 Manual Del Usuario

Applications & Basics of Testing
The MV4530 Cooling System Pressure Test Kit is designed to
diagnose and pinpoint the presence of leaks in an automotive
cooling system. It contains equipment to manually pressurize
and monitor a cooling system. Leaks are indicated by a drop
in pressure over a few seconds or minutes. The location of
external leak(s) is pinpointed by the visible seepage of fluid
resulting from the pressure. Internal leaks, which may not be
visible, typically indicate a blown head gasket or damaged
block or head, and can be diagnosed by monitoring the
pressure during a quick "engine on" test.
The MV4530 can also be used to test cooling system pressure
caps, which utilize a relief valve for protection against over-
pressurization. A malfunctioning cap can cause over- or under-
pressurization of the cooling system, leading to overheating
and/or severe engine damage. This test is performed using the
pressure pump included in this kit, however it also requires cap
test adapters that are not included with this kit, and must be
purchased separately. Refer to the Adapter Selection Guide
included in the kit for more information on cap adapters.
Precautions
This equipment is designed for servicing a variety of vehicles
in a safe, convenient manner. However, differences in cooling
systems may make it impossible to perform some of the tests
indicated in these instructions on every vehicle. The procedures
documented in this manual are to serve as guidelines for the
use of this equipment. In addition to these guidelines, always
follow the manufacturer's recommended procedures when
servicing each unique vehicle. Do not attempt to force a test
on a cooling system for which this equipment is not designed
to perform.
Performing cooling system tests using the MV4530 is simple
and straightforward if you follow the instructions. However,
always keep in mind that you are working with a system that
may be full of cold or hot fluid that is under pressure and just
waiting to be expelled. If you are testing an engine that is hot
and/or pressurized, always stop to think before pressing the
relief valve, removing a cap, or disconnecting a hose or other
component.
Always read carefully and understand instructions prior to using
this equipment.
Always wear eye protection when removing radiator or coolant
bottle cap, or when performing any cooling system test.
Never remove the radiator or coolant bottle cap, or attempt to
pressurize the cooling system of a vehicle that is overheated.
Always allow system to cool prior to attempting to perform any
cooling system related test procedure.
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Basics of Testing
When deciding where to connect to the cooling system,
first look for the radiator and determine if it has a fill neck
and pressure cap. This is common on about half of US
manufactured vehicles, and almost all Asian manufactured
vehicles, and would be the first choice for connecting. If the
radiator is closed and inaccessible, then the connection will
be made through a coolant bottle. Some automotive cooling
systems utilize a coolant overflow bottle that is not part of the
sealed system. Attempting to test the cooling system through
this bottle will not connect you into the sealed system, and will
simply vent the test pressure to the atmosphere. This type of
overflow bottle is easily recognized because it typically utilizes
a snap-on style cap or a threaded cap that is open to atmos-
phere. There are no adapters that are designed to fit this type
of coolant overflow bottle. A test connection should be made
through a radiator or coolant bottle with a bayonet or threaded
style of cap designed to maintain a specific pressure in the
cooling system.
Adapters
The MV4530 includes four cooling system adapters that fit
the radiators and coolant bottles on the vast majority of US
and Asian manufactured vehicles, and even some European
vehicles. An adapter is required to connect the test equipment
to the cooling system of the specific make and model being
tested. Once the correct adapter is identified for the vehicle
being serviced, it can be used to perform all of the tests outlined
in this manual except for the cap pressure test. To perform a
test on a vehicle application not covered by one of the four
included adapters, or to perform a cap pressure test, additional
adapters must be purchased. Adapters are available for virtually
every make and model of car or light truck, and can be
purchased individually or as part of an adapter kit from an
authorized Mityvac distributor. Refer to the Adapter Selection
Guide included in the kit for more information on adapters.
Form 823916