My water pressure gauge does not read at idle and seems high at full throttle. (I have a MercMonitor)
The speedo stopped working too.
How does the water pressure gauge get it pressure?
The reason I asked is I put some compressed air to the slot on the lower unit and the water pressure gauge moves.
Did I mix up the water lines at the gauges?
1997 Ranger 692VS
2014 Mercury 175 Pro XS 2B111166
Anyone know where the pressure gauge gets it's pressure?
1997 Ranger 692VS
2014 Mercury 175 Pro XS 2B111166
This will depend on whether you're using an ANALOG Water Pressure Gauge or a SYSTEM LINK Pressure Gauge.
SMARTCRAFT water pressure comes from the block pressure sensor that comes standard on your engine model.
Analog water pressure is "teed" in the same GRAY TUBING down the port side of the engine and on to the rigging for the boat.
If in doubt- post a picture of your gauges.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
This is the gauge Don.
1997 Ranger 692VS
2014 Mercury 175 Pro XS 2B111166
That's analog. It would feed from GRAY tubing that comes from the back of the engine (via a "tee") and heads up through the rigging tube to this gauge.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Any idea why the water pressure gauge does not read at idle and seems high at full throttle?
1997 Ranger 692VS
2014 Mercury 175 Pro XS 2B111166
What is it reading at idle and full throttle?
As Don always says, when concerned about water pressure start at the source - the water pump. When was yours last serviced?
_______
Phil
'09 Hewescraft ProV
'09 150 Optimax
But why doesn't it match the Smartcraft?
1997 Ranger 692VS
2014 Mercury 175 Pro XS 2B111166
Looking back at your original post you didn’t state it, but it sounds like you may have manipulated the tubes to water pressure and speedo gauges at the dash... As you stated you put air to the pickup on the lower unit and your water pressure gauge moved, sounds like tubes are mixed up at the dash. Pickup on the lower unit is for the speedometer. Swap the tubes at the dash and check with air pressure again to see if the speedometer moves and if it does, you should be good to go.
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