I'm Stumped! "Deaeration Hose" on 4106's 8V71??

OneLapper · July 13, 2010, 04:38:40 AM

Can anyone tell me what this hose does? And more importantly, WHERE does it go?

?

The highest point of the engine has this fitting and a hose attached to it going to the Coolant tank area. The hose was rotted and broken when I removed it from the engine. I need to replace the hose but can't figure out where the other end of it is attached to!!!

Here's the fitting on the top of the engine that the hose is attached to:

Here's the broken hose. The left most air filter is visible, and the left side of the view has the bottom of the coolant tank.

I thought that this hose might attach to the vent hose and allow air trapped in the engine cooling system to vent to atmosphere, but then the cooling system wouldn't build up pressure, would it?

Here's a picture of the vent hose: it's behind the pressure relief valve, in the left hand corner. I "think" it might attach to that, but it's a different type of hose connect to the pipe with with a hose clamp.

Do I need to remove the coolant tank? Has anyone done here done that before??? I'm installing the engine Thursday night (hopefully) but need to get this figured out first!!

bevans6 · July 13, 2010, 05:07:42 AM

I call them bleed hoses, when I design race car cooling systems I route them to the top of the coolant expansion tank. Yes, they need to be pressurized and they should ideally lead in an always-rising path so they self-bleed, but that's not critical.

Brian

06 Bill · July 13, 2010, 05:44:05 AM

One Lapper--- on my 06 that hose goes into the top of the overflow/pressure/fill tank. It bleeds off any air trapped in the thermostat housing. Also you have to remove the tank to access the pressure relief valve also on top of the tank. Not that bad of a job. There is a flange around the middle area of the tank that is bolted to the body. This valve is the only vent to the atmosphere. Also make sure the seal in the fill cap is in good shape as this will bleed off any pressure tying to build. If I remember the valve is only 5-7 psi.
HTH 06 Bill

mountain goat · July 13, 2010, 10:12:41 AM

Is the pressure relief valve on top of the tank still available new anywhere? It appears to do the same thing as a radiator cap. I am going to put a coolant recovery bottle on mine instead of venting to the ground. That way if it does "spit" some fluid out on a hot day it can suck it back into the system as it cools down. This should keep the system full of coolant at all times.

06 Bill · July 13, 2010, 10:42:36 AM

Actually I don't see why a junkyard radiator fill neck could not be cut in and soldered into a place more aces sable on the tank. This
would allow a lot of choices as to pressure. Solder a plate over the old hole, the new neck would have it's own overflow fitting for a
hose to your recovery container. 06 Bill

mountain goat · July 13, 2010, 10:50:15 AM

Inside of "D" you will find a spring and gasket that resembles a radiator cap. Hope this helps!

luvrbus · July 13, 2010, 10:53:05 AM

You can do away with the relief valve and the filler neck lot's of places sell the cap and neck that bolts to the tank that 06 is speaking of

mountain goat · July 13, 2010, 10:55:40 AM

try this

OneLapper · July 13, 2010, 05:09:53 PM

PERFECT!!!! I was not able to find that diagram!

Now I know I need to remove that tank and get a length on that hose. I can get the tank removed Wednesday, have the hose made, and get it re-installed for Thursday which is the day I'm hoping to get the engine back in. I'm getting down to the wire to get this bus running!!!!

Thanks for all the feedback, guys!

Mark

Chopper Scott · July 13, 2010, 05:18:28 PM

Good luck Mark. We'll be looking forwards to your great vid and or pics of the transplant!!

mountain goat · July 13, 2010, 06:04:19 PM

Mark, If you have time, let me know what you come up with for a length on the hose. I need to have one made also and my engine is all apart right now.

Thanks, Brian

OneLapper · July 13, 2010, 06:27:25 PM

Quote from: mountain goat on July 13, 2010, 06:04:19 PM
Mark, If you have time, let me know what you come up with for a length on the hose. I need to have one made also and my engine is all apart right now.

Thanks, Brian

Will do! No problem.

bevans6 · July 14, 2010, 05:53:17 AM

FWIW, for low pressure hose like that I just buy the hose in long lengths and the ends, and make them up myself. The ends just screw together, vise and a couple of wrenches.

Brian

Just Dallas · July 14, 2010, 11:00:41 AM

Removed

OneLapper · July 15, 2010, 10:39:34 PM

Quote from: mountain goat on July 13, 2010, 06:04:19 PM
Mark, If you have time, let me know what you come up with for a length on the hose. I need to have one made also and my engine is all apart right now.

Thanks, Brian

Three feet!