Shorties on a 390?
#11
Crazy Energy
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Aug 2007
Location: Oklahoma God's country no one else wants it.
Posts: 4,334
Likes: 0
Received 1 Like
on
1 Post
![Default](/forums/images/icons/icon1.gif)
Hook the psi gauges up to the oil cooler. You should have 5-8 PSI Idel and Merc says the 525 closed system is good to 43PSI IMCO's with the water pickups at the very front of the cones makes a lot of pressure but the 525 likes water pressure. The factory service manual puts the max at 43 PSI. If you see more you may have to add relief valves.
#14
Crazy Energy
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Aug 2007
Location: Oklahoma God's country no one else wants it.
Posts: 4,334
Likes: 0
Received 1 Like
on
1 Post
![Default](/forums/images/icons/icon1.gif)
[ATTACH=CONFIG]503492[/ATTACH]
Take the merc water pressure sensor out of the oil cooler and put your hose there. (See Diagram)
http://www.boats.net/parts/search/Me...%29/parts.html
Take the merc water pressure sensor out of the oil cooler and put your hose there. (See Diagram)
http://www.boats.net/parts/search/Me...%29/parts.html
#15
Registered
Thread Starter
Join Date: Feb 2009
Location: e.h.t n.j.
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I see the diagram and I understand. When I remove the sensor is there a kit merc makes for the hook up. By disconnecting that sensor will it effect the ecu? I greatly appreciate all of the correct info, thanx tim
#17
Registered
![Default](/forums/images/icons/icon1.gif)
Provided there's room, a standard T-fitting would allow you to retain your sensor and install a hose barb for your pressure line. Another alternative is to insert a t-fitting into the supply water hose (Teague and Eddie Marine sells these for larger diameter hoses). I believe Merc's pressure relief valve kit similarly installs in a hose but not sure which hose is recommended.
Last edited by Revelocity; 07-01-2013 at 08:22 AM.
#18
Registered
Join Date: Apr 2003
Location: Punta Gorda
Posts: 1,838
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
Drill a hole and tape it 1/4 pipe in the plate on outlet side of your oil cooler that you can remove to clean it. This way if you plug it up you know wright away. That's the first place crap gets stuck . I have done all my 500s like that . simple and done!