TM 5-3895-383-24
Water Pump Pressure Check
Tools Needed
6V8138
Pressure Gauge
1
8J7844
Adapter (3/4-16 to 1/4 NPTF)
with
3K0360
O-ring Seal
1
5P2725
Self-Sealing Probe Adapter
1
5P2718
Pressure Probe [if port (1) is used, two tools
are required - see illustration below].
1
5P4487
Adapter (1/2-20 to 1/8 NPTF)
With
1J9671
O-ring Seal
1
5P2720
Self-Sealing Probe Adapter
1
SP2718
Pressure Probe [if port (2) is used, two tools
are required - see illustration below].
1
Water Pump Group
(1) Pump outlet pressure (alternate heater supply). (2)
Alternate pump outlet pressure (for engine diagnosis). (3)
Water pump inlet, 2 ports (heater return).
The pressure rise (increase in pressure or pressure differential)
tells if the water pump is operating correctly. Measure the
pressure rise across or between port (1) or port (2) and one of
two ports (3). Ports (1) and (2) represent water pump outlet
pressure. Ports (3) represent water pump inlet pressure
(suction). With the engine at operating temperature, under full
load condition, the pressure rise must be a minimum of 80 kPa
(12 psi).
6-87
