|
525efi Reversion??
I just completed a stock rebuild of a 525 Mark Boos @Precision Marine done the engine work. The engine has stainless Marine manifolds pressure tested good. Broken in on the Dyno with no issues. Installed in the boat after idling until the thermostat opened we checked the manifolds and found a small amount of water/dampness in the bottom of the exhaust manifolds. The risers are Stainless Marine risers and checked good when tested with water off the engine. Could this be a reversion issue? Any advice would be helpful. https://cimg4.ibsrv.net/gimg/www.off...579254ea6d.jpg
|
Sounds like reversion. May not end up being a problem if you used inconnel exhaust valves and try to keep the engine off idle as much as practical. Things other than water leaks that could cause this would be cam incorrectly degreed or an exhaust valve not sealing entirely. I'd run it though and watch for more clues.
BT |
BT, I was thinking the same thing. A couple thoughts, we were running on a hose and the water was cold it could have been condensation as it was very damp air also. I also found a small exhaust leak between the manifold and the riser, according to stainless marine this will cause reversion also. I am going to change the gaskets, use sealant and see how it does. Yes I do have inconel valves, this is my first 525 and I may just be overly cautious. |
Running on the hose or in the water?
If on the hose, is the boat sitting at the same angle as when it sits in the water at idle?? Bow being down slightly could make a difference. Its possible that it could just be some condensation as well. |
Originally Posted by Griff
(Post 4664131)
Running on the hose or in the water?
If on the hose, is the boat sitting at the same angle as when it sits in the water at idle?? Bow being down slightly could make a difference. https://cimg1.ibsrv.net/gimg/www.off...c1ef493aef.jpg |
Originally Posted by Lil Mick
(Post 4664111)
BT, I was thinking the same thing. A couple thoughts, we were running on a hose and the water was cold it could have been condensation as it was very damp air also. I also found a small exhaust leak between the manifold and the riser, according to stainless marine this will cause reversion also. I am going to change the gaskets, use sealant and see how it does. Yes I do have inconel valves, this is my first 525 and I may just be overly cautious. |
The leak will cause reversion not because the water is in the joint but it’s pulling more vacuum through the riser |
How does a leaking riser gasket create more vacuum?
|
Originally Posted by blue thunder
(Post 4664153)
How does a leaking riser gasket create more vacuum?
|
The exhaust escaping sooner pulls more vacuum up the tailpipe. I had it happening with a leak at riser gasket on stand. Eddie young also told me this was likely the reason and it was. |
| All times are GMT -5. The time now is 10:54 PM. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.