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Radiator pushing water out of cap

P

plowhand

Member
My 6 cylinder diesel is pushing water out of cap.I just overhauled engine and filled radiator it's not running hot 160 Is there a chance this will stop when the water level gets down to a certain point,
 
is the thermostat open when it doing this? and how full did u have the coolant? and are the springs on thermostats towards engine block or down?
 
Did you re-torque the head bolts after you warmed it up?? If you didn't good chance your getting combustion blow back into the cooling system
 
With no overflow reservoir, the "filling" must not be to the very neck. Covering the core down in there about an inch is full. If not over filled, you need a kit from NAPA or others to detect combustion gasses in the radiator. Cheap and easy. Jim
 
I wonder is the engine grueling when the water is being pushed out. If so did you install the head gasket in the right position. I use to get dodge truck over here where people would overall dodge trucks. Some time they would install a head gasket upside down and it would block a water jacket. Making the engine grueling and throwing water out of radiator. Do not know if this helps you but just my thoughts on Head Gaskets.
 
Did you bleed the air after you rebuilt it and refilled the radiator? Are there bubbles in the water right after you first start it up ?
 
Pushing water out of rad, sounds like engine compression is pressurizing the coolant system. And I believe it could be anything from head gasket to cylinder sleeve. I was operating a tractor once when suddenly one sleeve developed a hole. Coolant started to enter the cylinder making the engine smoke like a coal fired locomotive, and coolant blew out of the rad like a fountain. Was a amazing show, but expensive
 
if the temp only gets to 160 then its either to full or your cap is bad. you only need to have enough liquid to over all of the radiator. I leave mine about 3 Inches from the top. as the water is heated it will create pressure and it has no where to go except out of the cap.
 


You can't get a diesel above 160 without putting a load on it. 1/4 inch over the tubes in the radiator is adequate. As janicholson says if there is no recovery system it is going to push coolant out as it expands. I made a simple recovery can for one one of mine by placing a tin can between the radiator and the grill and running the overflow tube into it.
 
Some engines take a bit to get that last burb of air out of engine. As others have said if you fill it to the top of neck, then put the cap on as the water expands it needs to go somewhere, all you need is the top of core covered. After it cools where is the water level? That will give you a clue into what is going on
 
There is air trapped in the cooling system. It could be trapped from the initial coolant fill, or else there's a leak allowing air to be pumped from a combustion chamber into the cooling system. Either way, the air will prevent the thermostat from opening, forcing water to blow out the radiator as the air in the system expands.

Try to bleed the air out of the system. If you can open a cooling system fitting at the top of the engine, the coolant level will drop in the radiator and you can add coolant until it comes out the open fitting. If nothing else is available, remove the thermostat and fill to the thermostat level. Then button everything up and try again.

If you continue to have coolant coming out, it means more air is coming in. Could be a head gasket leak. Some diesels have seals around the injectors that can leak as well.
 
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