Dynamic Pressure Test (Engine On) - Mityvac MV4530 Manual Del Usuario

Dynamic Pressure Test (Engine On)

For diagnosing:
Cooling system leaks
Cylinder head damage
Set-up & Procedure:
1. Ensure the cooling system is cool and not pressurized. Carefully
remove the radiator or coolant bottle pressure cap (Fig. 6).
2. Check to see that the radiator or coolant bottle is filled to the
proper level, and check hoses for visual damage or leaks. Fill
and repair as necessary prior to testing.
3. Select the correct Cooling System Adapter for the application.
Refer to the Adapter Selection Guide included in the kit.
4. Apply water or coolant to the rubber gasket and/or o-ring on the
adapter, and install the adapter in place of the pressure cap (Fig. 7).
5. Install the Pressure Pump onto the System Adapter using the
quick-connect. Make sure the quick-connect sleeve snaps
forward to lock the connection (Fig. 8).
6. Start the vehicle engine and monitor the pressure gauge.
An immediate and rapid pressure buildup is an indication of
a breach between a cylinder and the cooling system, most likely
due to a blown head gasket. Immediately turn off the engine and
release the pressure in the system by pressing the Pressure Relief
Valve located on pump hose near the quick-connect coupler (Fig.
9). Disconnect the test equipment and replace the head gasket.
If no immediate or rapid pressure buildup is indicated, operate the
pressure pump to bring the system to normal operating pressure.
If the needle on the pressure gauge vibrates rapidly, this is an
indication of a smaller compression or combustion leak into the
cooling system possibly caused by a damaged block or head.
Turn off the engine, carefully release the pressure in the system
by pressing the Pressure Relief Valve located on pump hose near
the quick-connect coupler (Fig. 9). Disconnect the test equipment
and make necessary repairs.
7. If no abnormal pressure buildup is indicated, carefully release the
pressure in the system by pressing the Pressure Relief Valve locat-
ed on the pump hose near the quick-connect coupler (Fig. 9). Let
the engine run until it reaches normal operating pressure and tem-
perature. Turn off the engine and allow it to cool with pressure still
applied. Check for leaks as the engine cools. A leak caused by a
slightly loose hose clamp or a stuck hose clamp that gives a false
sense of tightness, may only be noticeable during cool down.
aution: This equipment is not designed to release pressure from
a hot engine. Do not press the pressure relief valve, or attempt to
disconnect the pump or adapter until the engine is completely
cool. Doing so will allow hot fluid to be released, possibly causing
severe personal injury.
8. When testing is complete and the engine is cool, release any
remaining pressure in the system by pressing the Pressure
Relief Valve located on pump hose near the quick-connect
coupler (Fig. 9).
9. Repair leaks if necessary, and retest.
10. Disconnect components, clean and store them properly.
11. Refill the radiator or coolant bottle to the proper level, and
replace the cap.
Page Number - 6
Blown head gasket
Cracked block
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Form 823916