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Pressure in coolant system pushing into expansion tank

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Mbeavers

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Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator.
All this started after the bypass line going to riser pipe failed. Could it still have air?? Or going to be head gasket
The times pressure or how much coolant moves and temp it runs varies. Nothing is consistent to tell me I have a head or head gasket problem. I have a 15,000 fifth wheel. I can hook to it go 5?miles have to move antifreeze back then roll 200 miles with no problem with temp running 197 to 212. Then pulling empty will do same thing. Is this for sure signs of a gasket problem. All help is greatly appreciated it’s a head scratcher
Ohhh yeah it’s running a H& S mini max with 80 horse tune I believe
 
Mbeavers said:
Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator.
All this started after the bypass line going to riser pipe failed. Could it still have air?? Or going to be head gasket
The times pressure or how much coolant moves and temp it runs varies. Nothing is consistent to tell me I have a head or head gasket problem. I have a 15,000 fifth wheel. I can hook to it go 5?miles have to move antifreeze back then roll 200 miles with no problem with temp running 197 to 212. Then pulling empty will do same thing. Is this for sure signs of a gasket problem. All help is greatly appreciated it’s a head scratcher
Ohhh yeah it’s running a H& S mini max with 80 horse tune I believe
Click to expand...
get some combustion test strips to see if there is combustion gasses in the coolant it could be just a need for head studs or it could be the head gasket
 
Google-“bubble test for Diesel engine”
When you do this test- engine must be up to temp and may have to raise RPM up. You can also have scanner on engine while testing and cut out cylinders to see any changes.
Good Luck!
 
Mbeavers said:
Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator.
All this started after the bypass line going to riser pipe failed. Could it still have air?? Or going to be head gasket
The times pressure or how much coolant moves and temp it runs varies. Nothing is consistent to tell me I have a head or head gasket problem. I have a 15,000 fifth wheel. I can hook to it go 5?miles have to move antifreeze back then roll 200 miles with no problem with temp running 197 to 212. Then pulling empty will do same thing. Is this for sure signs of a gasket problem. All help is greatly appreciated it’s a head scratcher
Ohhh yeah it’s running a H& S mini max with 80 horse tune I believe
Click to expand...
Time for studs...head gasket .. good thing your pushing from the cylinder to the coolant passage...could be worse and be blowing it to the oil pan...
 
snopro said:
Time for studs...head gasket .. good thing your pushing from the cylinder to the coolant passage...could be worse and be blowing it to the oil pan...
Click to expand...
He said it passed the combustion gas test so no its not likely the HG…
 
H3LZSN1P3R said:
He said it passed the combustion gas test so no its not likely the HG…
Click to expand...
So did mine...would only pass to the coolant bottle when you got on it for passing gear in performance mode...and when the turbo brake put back pressure on the cylinders...other than that, if you just drove it normal everything was peachy...
 
snopro said:
So did mine...would only pass to the coolant bottle when you got on it for passing gear in performance mode...and when the turbo brake put back pressure on the cylinders...other than that, if you just drove it normal everything was peachy...
Click to expand...
I have yet to see one that the combustion strips did not pick up combustion gasses when it only happened in the manner you describe.
 
H3LZSN1P3R said:
I have yet to see one that the combustion strips did not pick up combustion gasses when it only happened in the manner you descri
Click to expand...

H3LZSN1P3R said:
I have yet to see one that the combustion strips did not pick up combustion gasses when it only happened in the
H3LZSN1P3R said:
I have yet to see one that the combustion strips did not pick up combustion gasses when it only happened in the manner you describe.
Click to expand...
I'm sure you'll educate me then...
Click to expand...
 
Im just saying i have never seen it never said it was not possible but perhaps something else was at play like bad test kit or something….
 
I have the same problem going on but I have already put on a from Cummins reman Head and gasket with ARP installed, mine started as a bad EGR cooler that was replaced to then having coolent being pushed into the overflow bottle. Fails blue water battle test when its hot. put pressure gauge on radiator ran extra hose into cab and drive come to find that its not building pressure under boost but when it comes to a idle while making a turn or stopping at a light or sign, with out without the exhaust brake on. any help might save me from pulling the trigger on a long block tomarrow.
 
Mbeavers said:
Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator.
All this started after the bypass line going to riser pipe failed. Could it still have air?? Or going to be head gasket
The times pressure or how much coolant moves and temp it runs varies. Nothing is consistent to tell me I have a head or head gasket problem. I have a 15,000 fifth wheel. I can hook to it go 5?miles have to move antifreeze back then roll 200 miles with no problem with temp running 197 to 212. Then pulling empty will do same thing. Is this for sure signs of a gasket problem. All help is greatly appreciated it’s a head scratcher
Ohhh yeah it’s running a H& S mini max with 80 horse tune I believe
Click to expand...
What did you find out here?
 
Mbeavers said:
Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator.
All this started after the bypass line going to riser pipe failed. Could it still have air?? Or going to be head gasket
The times pressure or how much coolant moves and temp it runs varies. Nothing is consistent to tell me I have a head or head gasket problem. I have a 15,000 fifth wheel. I can hook to it go 5?miles have to move antifreeze back then roll 200 miles with no problem with temp running 197 to 212. Then pulling empty will do same thing. Is this for sure signs of a gasket problem. All help is greatly appreciated it’s a head scratcher
Ohhh yeah it’s running a H& S mini max with 80 horse tune I believe
Click to expand...
 
Your feelings are correct... it's time to put a head gasket in...make sure you install head studs so you won't have to do it again..stock stud the weak link...
 
snopro said:
Your feelings are correct... it's time to put a head gasket in...make sure you install head studs so you won't have to do it again..stock stud the weak link...
Click to expand...
You tried to tell him the same info 5 months ago….
 
H3LZSN1P3R said:
You tried to tell him the same info 5 months ago….
Click to expand...
Well..what can you do... it's not an easy job... especially if it has all the emissions on it... you're already having to stand 2 ft.off off the ground crawling halfway into firewall...bent over ...especially if you don't have a extendable boom cherry picker and building yourself a special lift adapter to keep the head controlled level until the rad support...if you're a decent wrench it still takes the better part of a weekend to do the job... baring any head work...
 
snopro said:
Well..what can you do... it's not an easy job... especially if it has all the emissions on it... you're already having to stand 2 ft.off off the ground crawling halfway into firewall...bent over ...especially if you don't have a extendable boom cherry picker and building yourself a special lift adapter to keep the head controlled level until the rad support...if you're a decent wrench it still takes the better part of a weekend to do the job... baring any head work...
Click to expand...
Its a pretty easy job actually just a bit time consuming but thats not what i meant lol
 
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