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Jan 23rd, 2013
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Murcury 200 hp Water Presure #13566054 05/21/20 12:24 PM
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Costa Plente Online Content OP
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What can cause low water pressure ? I have only 10psi when I am at 4500rpm running down the lake.

Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13566136 05/21/20 01:22 PM
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gary purdy Offline
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Week impeller, water pump housing needs replaced too, poppet valve weak or valve leaking. Best advice I can give you is to check the gauge first, then replace complete water pump, complete poppet assembly and both thermostats.
.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13567291 05/22/20 11:58 AM
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Costa Plente Online Content OP
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So what your saying is that even though the motor has a strong peeing flow at the Idle but low water pressure while on plane trimmed and running down the lake that it's the impeller.

Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13567346 05/22/20 12:47 PM
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DLALLDER Offline
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Originally Posted by Costa Plente
So what your saying is that even though the motor has a strong peeing flow at the Idle but low water pressure while on plane trimmed and running down the lake that it's the impeller.


Costa,, I AM NOT A OUTBOARD MECHANIC but I have a 2000 200hp Merc. I have had the same symptoms for the 10-12 years that I have owned the rig. Impeller normally get changed out at 2 years intervals. Even with new impeller gauge pressure is the same about 10 lbs at 3000 to 3500 rpm. I believe the gauge is INCORRECT. Like you said good peeing at idle with only about 1-2 lbs showing. Long story short I have quit worrying about it. Daniel

Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13567431 05/22/20 01:50 PM
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TLW Offline
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Originally Posted by Costa Plente
What can cause low water pressure ? I have only 10psi when I am at 4500rpm running down the lake.


has it always been this way?.. did it decrease (if that applies) all of a sudden or over time?.. has tha buzzer ever went off?..........

Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13567539 05/22/20 03:07 PM
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Pat Goff Online Content
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The water pressure gauge is a tube that runs from your engine to your dash. Tubes can kinked, blocked, piece of sand can get wedged.

Before you start on anything else, take your cowling off, and inspect that tube from the motor to the gauge. I'll wager you have a leak or blockage.


Pat Goff
Seadrift TX
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Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13568020 05/22/20 09:26 PM
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Costa Plente Online Content OP
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I just bought the boat so I can't tell you what it did in the past. Talked to the prior owner and was told the impelled was changed about three years ago so I will be changing it soon. The motor has a smart gauge on it and the temp reading is fine so maybe it is will be alright after I change the impeller. It could be the way Daniel said and I just quit worrying about it as long as it's peeing good and the temp isn't too high.

Re: Murcury 200 hp Water Presure [Re: Costa Plente] #13572240 05/27/20 12:35 AM
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ssmith Online Content
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water pump kits are cheap compared to losing a powerhead an 3 years is too long without one.

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