LOCKNUT 3961284 - Caterpillar

Table 1
Required Tools    
Part Number     Description     Quantity    
6V-7775     Air Pressure Gauge     1    
8J-7844     Adapter Fitting     1    
3K-0360     O-Ring Seal     1    
5P-2725     Probe Seal Adapter     1    
164-2192     Probe Adapter Gp (1)     1    
5P- 4487     Adapter     1    
1J-9671     O-Ring Seal     1    
5P-2720     Probe Adapter     1    
164-2192     Probe Adapter Gp (2)     1    
( 1 ) If port (1) is used, two tools are required. See the Illustration 1 below.
( 2 ) If port (2) is used, two tools are required. See the Illustration 1 below.
Illustration 1 g00708865
Pressure test ports for the water pump (1) Pump outlet pressure (alternate heater supply) (2) Alternate pump outlet pressure (engine diagnosis) (3) 2 Ports for the water pump inlet (heater return line)
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
The pressure rise is the difference between inlet pressure and outlet pressure. The pressure rise indicates if the water pump operates correctly. Port (1) and Port (2) represent the water pump outlet pressure. Port (3) represents the water pump inlet pressure. To measure the pressure rise, compare inlet pressure with outlet pressure. Calculate the difference between the pressure of the inlet port and the outlet ports. The pressure rise must add up to a minimum of 80 kPa (12 psi) under both of the following conditions:
The engine is at operating temperature.
The engine operates at full load condition.