Head fire rings

[Rawze]

(05-19-2022 )Scooby d Wrote:  The engine has 15,000 hrs and 380 k miles and is used off road a lot. I do all my own truck work. I have been to peterbilt once and cat once in my life and ended up giving them money for nothing... wont go back. The fire ring was suggested to me by a local mechanic just in conversation so I had to look into it. Wont be doing that! As far as moisture in number 6 I wasn't very clear on that. Truck was starting to biuld excess rad pressure a couple days ago and I thought my egr cooler was maybe on its way out. Backed truck in my shop on last trip and it was pushing about 1 gallon per hr out the overflow. When I said moisture in #6 I should have said puddle or maybe small creek. Puddle in #6 intake and exaust valves, water in turbo, water in egr cooler. Took antifreeze out and added straight water incase it was making its way to the pan but no water in the oil. I am going to check my egr cooler for leaks also. Just my thoughts is a bad egr cooler sent water to the engine creating steam that took out the gasket... I don't know... what I do know is that I'm holding on to wrenches instead of my coffee cup today..lol

again.. if you had pressurized the coolant system to 20-psi and checked the engine / egr cooler properly for seepage then you would not be guessing like that about where the coolant/moisture was coming from.

it is quite easy to see if the egr cooler is seeping. ref:



{ that is an old video.. so I would have to say that anyone watching it .. I do NOT recommend waterless coolant systems.. here was the result of running waterless coolant for a long while: http://rawze.com/forums/showthread.php?t...14#pid1114 }


And it is fairly easy to see if the head gasket is bad. Here is an example of a sort of a worse case scenario towards testing for head gasket issues. Most of the time it is much easier to find that this one was...

Rawze Wrote:- We let it sit over night with 22-PSI pressure on it until next morning. Low and behold, we searched and searched {around the bottom of the enigne with the oil pan off of it} and there was zero signs of coolant getting into the oil at first. Sometimes it is obvious, but sometimes it is hard to find. We wiped everything down and spun the engine a few times over by hand (with long wrench) and could not immediately find any kind of coolant intrusion problem even though it is clear that there is a problem with the head, a gasket, liner... something. After looking and wiping things down under the engine, we decided to turn it by hand some more ... slowly to see if we could get a better view at each cylinder. While turning the engine over by hand very slowly, when piston number 5 came up on a compression stroke, instead of a dry "hiss" sound, it started to gurgle, and tiny droplets of coolant started to pour down the inside of the liner wall. Number 5 piston was leaking coolant out of the bottom of the piston. So far this tells us that there is a problem in the head or the head gasket at #5 cylinder area.

ref: http://rawze.com/forums/showthread.php?t...6#pid25356