Mercury 40 FourStroke - Water Pressure Measurement

GENERAL INFORMATION
Page 1C-20 90-857046R1 NOVEMBER 2001
Water Pressure Measurement
1. Warm up engine.
2. Remove plug.
3. Attach hose fitting and water pressure gauge to cylinder block.
NOTE: Water pressure measurements should be done on a warm engine with thermostat
operating 140
° F (60 ° C).
0
2
4
6
8
10
12
14
16
18
20
22
24
0123456
rpm x 1000
Pump Pressure (psi)
Water Pump Pressure
91-79250A2
22-89772
a
a-Plug