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Old 07-25-10, 10:27 PM   #1
MississippiBoy
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Default Water pressure gauge

My water pressure gauge on my boat doesn't work at the moment. Before I start monkeying around with motor height, I need to get it going. I blew through the tube after I'd disconnected it from the engine and from the gauge, so it's clear. When it was still hooked to the gauge, I couldn't make the gauge move by blowing into it, but I'm not sure a person could put enough pressure on it to register. I also unscrewed the fitting from the left head on the engine and looked inside, didn't see any obstructions or anything.
It seems to be a fairly straightforward system...the water pump pushes water up to the engine, which increases air pressure in the tube, which moves the gauge. There are a couple of wires connected to the gauge, but I believe they're just for the backlight, so power/no power shouldn't affect the gauge reading, should it?
Am I missing something, or should I maybe just replace the gauge and see what happens?
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Old 07-25-10, 11:01 PM   #2
bamabassman
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i say replace the gauge daniel. i am going to replace every gauge i have over time. saves a lot of headaches in the end i think.
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Old 07-25-10, 11:46 PM   #3
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Replace the gauge. If you are in a pinch you can substitute a cheap oil pressure gauge from an auto parts place. It will work but the readings will be a little high (I think).
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Old 07-27-10, 03:20 PM   #4
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You should be able to blow into it and make it move. Sounds like a bad gauge to me. Unhook the line with the engine running and see if you have good water flow.
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Old 07-27-10, 04:34 PM   #5
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Mississippi,

Is the gauge stuck in the 0 position or is it stuck at the opposite end... if it's the opposite end.. 9 times out of 10 it means the gauge is bad..I have replaced a few in my day and both were stuck as if they were reading wide open.
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Old 07-27-10, 04:37 PM   #6
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Quote:
Originally Posted by skeeter1804 View Post
You should be able to blow into it and make it move. Sounds like a bad gauge to me. Unhook the line with the engine running and see if you have good water flow.
That's an idea. I can do that on muffs in the yard this weekend.

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Mississippi,

Is the gauge stuck in the 0 position or is it stuck at the opposite end... if it's the opposite end.. 9 times out of 10 it means the gauge is bad..I have replaced a few in my day and both were stuck as if they were reading wide open.
It stays at zero, doesn't even twitch at all.
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Old 08-04-10, 10:41 PM   #7
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Ok, got a new gauge in today, tried it with the muffs on in the yard, no luck. Also, I ran the motor with the tube disconnected from the gauge, and didn't get any water out of it. I could feel a little air coming out, but not much. I took the fitting on the motor off and ran it, and didn't get any water out of it, either. But after I turned off the motor and was looking at it scratching my head, I could see just a little bit of steam coming out of the hole where the fitting was.
I'm now officially at a loss. Any ideas?
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Old 08-04-10, 10:42 PM   #8
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guessing here daniel, but could it be clogged?
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Old 08-04-10, 11:13 PM   #9
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I'm guessing that may be true, John...I just don't know what to do about it. Do I take a coat hanger or something and try to poke around in there to break it up, or does it involve major disassembly of the engine? Yikes...don't want to think about that...
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Old 08-05-10, 07:52 AM   #10
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It sounds like your impeller is not pushing water up. You didn't say what kind of engine it was. On my old Johnson and my new (to me) Yamaha there is a single outlet for the water pressure gauge on one head. On the other head there is a brass plug which you can remove, then install the right fittings and hook up a garden hose to it to see if you get water out the other head. If you don't then it is probably blocked.
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Old 08-05-10, 05:49 PM   #11
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Sorry, it's a 1995 200 hp Yamaha Pro-V. The water pressure outlet is on top of the left (if you're looking at it from the back) head. A guy I just talked to said that there's probably a fitting down lower on the engine that I can screw a hose straight into to flush the motor. I might get out there tonight and see if that's true...if so, I'll try putting enough pressure in it to maybe free up any corrosion or whatever's blocking it.
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Old 08-05-10, 10:49 PM   #12
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I have the 225 Hp 2000 model Yamaha. The hose fitting the guy is probably talking about is intended to flush your lower housing unit. I don't think it does anything for the block but try it out and let me know if it flushes the block. every time I have used it I see crap come out of the lower end.
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