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525EFI Water Pressure Concerns

Old 05-17-2018, 10:25 AM
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Default 525EFI Water Pressure Concerns

New to me boat with 525's. Starboard water pressure gauge is reading 15-20psi while the port will peg the gauge well past 35psi. We did replace a broken plastic Perko flush/check valve for one of these https://www.supplyhouse.com/sh/contr...oduct_id=40615

Not sure what's going on here. Thoughts?
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Old 05-17-2018, 01:20 PM
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Even when I'm running wide open, my water pressure will be max 30 psi. Your reading could indicate an obstruction somewhere in the raw water loop. Backflush all coolers, hoses, etc. Any difference in operating temperature between the two engines?
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Old 05-17-2018, 02:22 PM
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No, operating temps of both seem to be steady between the two.

Honestly, I'm more worried about the high rather than the low pressure. I really don't want to push a gasket somewhere.
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Old 05-17-2018, 02:56 PM
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I usually see 25-30psi with dual water pickup drives and 525s. Even with strainers I still back flush the coolers individually and am always shocked what gets thru. Oil, PS and fuel coolers allow for many areas to form a blockage

Last edited by endeavor1; 05-17-2018 at 02:59 PM.
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Old 05-17-2018, 06:06 PM
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Originally Posted by endeavor1
I usually see 25-30psi with dual water pickup drives and 525s. Even with strainers I still back flush the coolers individually and am always shocked what gets thru. Oil, PS and fuel coolers allow for many areas to form a blockage
So.... do you think my lower pressure side is of more concern than the high pressure? I just get nervous when the gauge is pegged well past the last mark on the face.
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Old 05-17-2018, 06:12 PM
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Service manual says max water psi is 43. I routinely see over that with no problems and I've talked with others who see over 50 with no problem. I'd be more concerned about the low pressure engine.
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Old 05-17-2018, 06:59 PM
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Originally Posted by thirdchildhood
Service manual says max water psi is 43. I routinely see over that with no problems and I've talked with others who see over 50 with no problem. I'd be more concerned about the low pressure engine.

Good. I'll flush the STBD engine & see what we got.
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Old 05-17-2018, 08:41 PM
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Originally Posted by Holy Smokes
So.... do you think my lower pressure side is of more concern than the high pressure? I just get nervous when the gauge is pegged well past the last mark on the face.

yes i do. Id concentrate on that motor
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