Bravo-merc 525 water pressure issue
05-17-2021 | 12:35 PM
#11
Platinum Member
Joined: May 2012
Posts: 11,418
Likes: 3,938
From: Midwest & T-Rock
the water pressure has been like this since day one of owning the boat (5years). I back flushed every cooler and hose and tightened all hose clamps. With the inlet hose off the water pump. (Hose from transom assm to water pump). The one side is less water flow in with boat just sitting in the water. At cruise that engine is 3-4 psi less. At full throttle I have 47psi on the port and 29psi on the starboard. The starboard one is the one I’m having an issue with.
05-17-2021 | 12:38 PM
#12
Registered
Joined: Oct 2005
Posts: 5,825
Likes: 612
From: Clarkston, Michigan
I get 3-4 psi at idle on my 525. Service manual says max pressure at speed is 43 but I regularly see higher than that and so do many others so 47 is fine. The 29 psi I'd be concerned about, as you are!
Edit: F-2 Speedy, I respect your knowledge but lots of us run that high of pressure on a 525.
Edit: F-2 Speedy, I respect your knowledge but lots of us run that high of pressure on a 525.
05-17-2021 | 01:24 PM
#14
Charter Member # 55
Joined: Oct 2000
Posts: 20,232
Likes: 2,482
From: Omaha/LOTO
My vote is you have a partial obstruction somewhere.
With closed cooling like the 525EFI, I think 40psi at WOT is fairly normal.
05-17-2021 | 02:30 PM
#16
Platinum Member
Joined: May 2012
Posts: 11,418
Likes: 3,938
From: Midwest & T-Rock
05-18-2021 | 01:56 PM
#18
Registered
Joined: Nov 2004
Posts: 14,068
Likes: 3,667
From: On A Dirt Floor
1st thing always is to put something thru each water opening in the oil cooler.....as previously told. Doesn’t take much for a few or. 10 or 20 tubes to get something in them.
Many times back-flushing does squat.
Soeaking of which always amazes me how many big chunks of impeller I find in entrance of oil cooler in a boat with an impeller that’s in good shape. Person changing the blown apart impeller dumb or lazy or couldn’t give **** ? Doesn't’ wonder ‘Hey, wonder where the pieces went ?’
Many times back-flushing does squat.
Soeaking of which always amazes me how many big chunks of impeller I find in entrance of oil cooler in a boat with an impeller that’s in good shape. Person changing the blown apart impeller dumb or lazy or couldn’t give **** ? Doesn't’ wonder ‘Hey, wonder where the pieces went ?’
05-20-2021 | 09:04 AM
#19
Thread Starter
Registered
Joined: Oct 2011
Posts: 91
Likes: 3
1st thing always is to put something thru each water opening in the oil cooler.....as previously told. Doesn’t take much for a few or. 10 or 20 tubes to get something in them.
Many times back-flushing does squat.
Soeaking of which always amazes me how many big chunks of impeller I find in entrance of oil cooler in a boat with an impeller that’s in good shape. Person changing the blown apart impeller dumb or lazy or couldn’t give **** ? Doesn't’ wonder ‘Hey, wonder where the pieces went ?’
Many times back-flushing does squat.
Soeaking of which always amazes me how many big chunks of impeller I find in entrance of oil cooler in a boat with an impeller that’s in good shape. Person changing the blown apart impeller dumb or lazy or couldn’t give **** ? Doesn't’ wonder ‘Hey, wonder where the pieces went ?’
