truck puking coolant

P.I.S_7.3 · Oct 19, 2013

Truck has 238/200 injectors 38r billet turbo and arp studs. Also has 300k miles on it with original headgaskets.

Truck is blowing water out of the coolant tank as soon as you start it up. It even blew the capoff.

Almost zero pressure in the crank case. Oil is not mixing with the water. No smoke out of the tail pipe. Water in over flow tank is clean. Truck runs ok. Little power loss. Slight miss to it. Little rough.

Any ideas? Head gaskets?

Powerstroked162 · Oct 19, 2013

Sounds like you diagnosed it already. Stock head bolts?

P.I.S_7.3 · Oct 19, 2013

Nope arps. Installed them a couple years ago one at a time. So still the original gaskets

P.I.S_7.3 · Oct 19, 2013

What's the best head gaskets to get? Also is it mandatory for the heads to be machined?

Bustedknuckles · Oct 19, 2013

Lifted or cracked cup?

P.I.S_7.3 · Oct 19, 2013

Cups are good I believe. I just changed them because that's what I was told it was but had no change. No diesel or oil in the coolant

Blowby · Oct 19, 2013

Get a test kit from Napa. This will tell if combustion gasses are in the cooling area. If not then you can rest assured the HG's are OK.

P.I.S_7.3 · Oct 19, 2013

Ok. If its not head gaskets then what could it be? Cracked head?

bigfords · Oct 19, 2013

I'm thinking either way its going to be combustion gases. Whether its a cracked head or a bad head gasket. What else could be putting that much pressure in the cooling system?

Blowby · Oct 19, 2013

Have you checked the pressure? Is it greater than 16 psi? Is the cap plugged?

Edit: I see you stated it blew off as soon as you started the truck. Sorry dude.

P.I.S_7.3 · Oct 19, 2013

No the cap didn't blow off instantly. If you screw the cap on tight it won't puke right away. If the cap is off it bubbles out right away

P.I.S_7.3 · Oct 19, 2013

Cap and coolant tank is new. The tank was cracked.

TyCorr · Oct 19, 2013

That was it? Cracked tank. Or did the tank.crack.because of the pressure?

P.I.S_7.3 · Oct 19, 2013

No I think it cracked because it was old and dried out.

P.I.S_7.3 · Oct 19, 2013

Truck doesn't over heat either

TyCorr · Oct 19, 2013

I thought you said it was new? Your post lead me to believe that you replaced the shti.and then it cracked.

P.I.S_7.3 · Oct 19, 2013

No sir. It started out as a slow controlled over flow of the coolant bottle. Now its progressivley gotten worse. Now soon as you start it with the cap off it blows out almost instantly.
Yesterday it would only do it when u free rev it then let off it would push water out. But only after u let off the throttle

4.0l sahara · Oct 20, 2013

You will be pulling the heads. There is nothing other than combustion gas that can create the pressure to blow out the cap as soon as the truck is started.