PLATE-NUMBER 5M2973 - Caterpillar

Illustration 1.To test a water pump seal, do the steps which follow:
1. Place either an FT1752 or FT1762 Fixture on the table of the vacuum tester. The FT1752 Fixture is used to test water pumps on all 3200 Series Engines. The FT1762 Fixture is used to test water pumps on all 3400 Series Engines. See Illustration 2.2. Put the water pump on the fixture. On 3400 Series Engines, the water outlet will need to be sealed.3. Move the air control knob to the down position.4. Move the vacuum control knob to the down position. The vacuum gauge will read between 15 to 17 inches of mercury if the water pump seal is good.
Illustration 2.Since the tester operates from venturi suction, the amount of vacuum can be controlled with the air pressure adjustment screw. See Illustration 3. Turn the adjustment screw counterclockwise to increase the amount of vacuum and clockwise to decrease the vacuum.
Illustration 3. The pneumatic cylinder, shown in Illustration 1 can be used to push down on the water pump to start the seal between the water pump and fixture. Most of the water pumps used in Caterpillar Engines are heavy enough for a good seal between the rubber covered table or fixture to prevent air leakage and start the vacuum.A sudden drop in the amount of vacuum is an indication that the water pump seal needs to be replaced. If there is no vacuum decrease after five seconds, the water pump is good.
5. Move the vacuum control knob to the up position to break the vacuum and move the air control knob to the up position.The VI-A Tester is available from:
Industrial Air and Hydraulics, Inc.
3401 E. Randol Mill Road
P.O. Box 5327
Arlington, TX 76011
U.S.A.
Phone: 817-261-3811
Telex: 758-280