Offshoreonly.com - Merc Water Pressure

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- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Merc Water Pressure (https://www.offshoreonly.com/forums/general-q/352123-merc-water-pressure.html)

minxguy

02-03-2018 06:41 AM

I have an Imco shorty and a Mercury pressure regulator.

It dumps water at idle and runs around 30-32 PSI running.

I would love to drop the pressure to about 20 or less.

Ken

cigrocket

02-03-2018 07:18 AM

Quote:

Originally Posted by minxguy (Post 4608400)

I have an Imco shorty and a Mercury pressure regulator.

It dumps water at idle and runs around 30-32 PSI running.

I would love to drop the pressure to about 20 or less.

Ken

i have the same on my Playboy boat. Valves that keep it while running at below 30. I only idle around 10. Merc 500 EFIs that make 625+HP

fbc25el

02-03-2018 08:06 AM

Quote:

Originally Posted by AllDodge (Post 4608339)

Was it actually the standard Merc single stage pump?

It is a Jabsco brass single stage pump.

AllDodge

02-03-2018 08:09 AM

Quote:

Originally Posted by fbc25el (Post 4608407)

It is a Jabsco brass single stage pump.

Thanks

fbc25el

02-03-2018 08:15 AM

Quote:

Originally Posted by minxguy (Post 4608400)

I have an Imco shorty and a Mercury pressure regulator.

It dumps water at idle and runs around 30-32 PSI running.

I would love to drop the pressure to about 20 or less.

Ken

I first tried one of those regulators and had the same problem .Then I got a weaker spring and the pressure fluctuated real bad. So I ordered a regulator from CP that is adjustable problem solved.

BUP	02-03-2018 09:26 AM

My info was from OEM stock black side ecm 555 and pcm 555 as really thinking the op set up but was not sure what he has nor a stock set up nor what ECM / PCM

BUP	02-03-2018 10:04 AM

Quote:

Originally Posted by Unlimited jd (Post 4608340)

I swapped sportmaster for imco lowers on a 39 o/l. Pressure went from just touching 30 to wrapping the gauge back around to 0. Got it down to 38 for the key west run. This was a 525 boat. The 41 with 700's had a cooling issue and merc service manual said min 30psi @ wot

Water pressure psi ------- Correct the 700 Sci as Merc spec is 30 psi min at 5200 and MAX 50 psi at 5200 and will add this info the 600 SCi early engine serial numbers were that same as the 700 SCi but later engine serial numbers for the 600 SCi was 30 psi min at 5200 and MAX 42 psi at 5200 --- Merc Spec

minxguy

02-03-2018 01:50 PM

Quote:

Originally Posted by fbc25el (Post 4608409)

I first tried one of those regulators and had the same problem .Then I got a weaker spring and the pressure fluctuated real bad. So I ordered a regulator from CP that is adjustable problem solved.

Thanks

Ken

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