Overheating 454 Mag Bravo Gen IV
01-03-2009 | 05:34 PM
#12
Charter Member
Joined: Nov 2000
Posts: 1,094
Likes: 0
From: Lake Charles, LA USA
and those that know me will say I mention this alot - but it's often overlooked and has been the case of trouble for numerous boats I've worked on over the past couple of years ...Take the hose off at the transom that feeds the raw water pump and make sure you don't have a blockage at the transom end...In many cases the corrosion around the hose will push in and eventually collapse the inner fitting that holds the hose in place. If you can't get your pinky inside - you have a problem. On some boats you can fix it with the engine in - but some there just isn't the room to do the work. I have a 382 Formula lined up right now that we're pulling both motors to fix the stbd which overheats and also knock out the port motor while we're in there.The other option is to install a thru hull pickup..... if you find a blockage....Good Luck
Check the hose barb where the water comes through the transom assbly. It is held on with two bolts. Problem is that the barb covers the aluminum around the inlet hose and lets water come in contact with the aluminum and stays there. The corrosion pinches the water flow. There is a little plastic insert that holds the hose that comes from the drive securely in the transom assbly. The insert gets crunched and limits water flow.
__________________
Long time cult member.
Long time cult member.
Last edited by Thunderstruck; 01-03-2009 at 05:36 PM.
01-03-2009 | 05:46 PM
#13
Charter Member #1171
Joined: Feb 2001
Posts: 4,018
Likes: 21
From: Clearwater, FL
pull the cooler, not just backflush,,,,, remove the end caps and check for debris.
Pull the block drain plugs and see if water flows or it got packed with sand/debris
Pull the block drain plugs and see if water flows or it got packed with sand/debris
__________________
I want to live in a world where a chicken can cross the road and not have its motives questioned.
I want to live in a world where a chicken can cross the road and not have its motives questioned.
01-03-2009 | 11:37 PM
#14
Gold Member
Joined: Dec 2008
Posts: 215
Likes: 0
From: west mi
Amen
Check the hose barb where the water comes through the transom assbly. It is held on with two bolts. Problem is that the barb covers the aluminum around the inlet hose and lets water come in contact with the aluminum and stays there. The corrosion pinches the water flow. There is a little plastic insert that holds the hose that comes from the drive securely in the transom assbly. The insert gets crunched and limits water flow.
Check the hose barb where the water comes through the transom assbly. It is held on with two bolts. Problem is that the barb covers the aluminum around the inlet hose and lets water come in contact with the aluminum and stays there. The corrosion pinches the water flow. There is a little plastic insert that holds the hose that comes from the drive securely in the transom assbly. The insert gets crunched and limits water flow.
OK I will admit I'm a newbe here but I have put a boat (and engine) or two together but you obviously have something here.. what comes first, a hot motor or a cracked head?? I will be ripping my seawater pickups apart. the BAJA has these angled assemblies bolted to the transom. one thing I did notice was a #$#k load of zebra muscles on my drives when I pulled it out (was in from jul to oct) but I looked at the inlets and they looked ok. most of the zebras looked small enough to pass thru the grate of the pickups..
you don't suppose?????
01-03-2009 | 11:43 PM
#15
Charter Member
Joined: Nov 2000
Posts: 1,094
Likes: 0
From: Lake Charles, LA USA
The shells have a hard time getting into the raw water system but the mussel eggs or babies or whatever will get into the system and grow. Time to pull the hose barb on the transom assembly.
I believe that restrictions in the suction side of the raw water pump are worse than restrictions on the discharge side of the water pump so check the inlet side very closely. Hell, you've changed everything else!!!
I believe that restrictions in the suction side of the raw water pump are worse than restrictions on the discharge side of the water pump so check the inlet side very closely. Hell, you've changed everything else!!!
__________________
Long time cult member.
Long time cult member.
01-03-2009 | 11:47 PM
#16
Gold Member
Joined: Dec 2008
Posts: 215
Likes: 0
From: west mi
R/H exhaust manifold would not drain till I poked it w/stick but then pretty much flowed out fine?? funny #4 is on the R/H and there is where the crack is.
I now picture DR evil with pinky
01-04-2009 | 12:00 AM
#17
Gold Member
Joined: Dec 2008
Posts: 215
Likes: 0
From: west mi
The shells have a hard time getting into the raw water system but the mussel eggs or babies or whatever will get into the system and grow. Time to pull the hose barb on the transom assembly.
I believe that restrictions in the suction side of the raw water pump are worse than restrictions on the discharge side of the water pump so check the inlet side very closely. Hell, you've changed everything else!!!
I believe that restrictions in the suction side of the raw water pump are worse than restrictions on the discharge side of the water pump so check the inlet side very closely. Hell, you've changed everything else!!!
are there any upgrade options here?
Bobbo
