Water Pressure Check - Mercury 150 EFI Service Manual

COOLING

Water Pressure Check

Water pressure may be checked by attaching a test pressure gauge to the top of the engine
block.
A water pressure line (GRAY colored) is provided that exits at the front of the lower cowl.
A dash style gauge may be connected to this line to register water pressure.
Shut off engine and refer to troubleshooting chart if water pressure is not within
specification. DO NOT exceed 3000 RPM in neutral.
Idle
Poppet Valve Opening
W.O.T.
Page 4B-10
WARNING
1.0 – 3.0 PSI
(6.8 – 20.5 kPa)
4 – 9 PSI
(27.4 – 61.6 kPa)
12.0 PSI (82.1 kPa)
Minimum
90-883728 JULY 2001