lly upper hpse hard

[Houser04lly]

I know there are threads about this but I would like to some more opinions about my LLY I was under the hood when engine was cold and my upper hose was hard I slowly opened the fill cap and it hissed releasing pressure. Hose got soft and my coolant looks clean and so does my res. Oil looks good also. Balance rates check out. Any opinions I appreciate. I appologize in advanced for another thread like this.
Thanks Brock

 

[dirty_max]

possibly popped the head gaskets, maybe try changing the cap first

 

[03BlkMax]

X2 on the headgaskets

Galaxy S3

 

[gmac32]

x3 on the headgaskets

 

[dirty_max]

dont feel bad, im not far behind you :roflmao:

 

[Houser04lly]

Not what I wanted to hear. I'm gonna try a cap first. Anything else I could check to diagnose?

 

[sweetdiesel]

im willing to bet its a head gasket

 

[Houser04lly]

Runs cool and everything. Just weird

 

[sweetdiesel]

you can pressure up the coolant tank and leave it for a while but this doesnt always work. cylinder pressure is substantilly higher.

Lly are notorious for head gaskets imo

 

[dirty_max]

im confused as to why you would pressurize the cooling system?

 

[sweetdiesel]

some times, if you run it hard your ect will fluctuate due to fluid/gas running by the temp sensor.
If the gaskets are bad enough you can pull the glow plugs after a hard run and let ot sit overnight. in the morning crank it over and check if coolant shoots out.this is only when they are real bad

 

[Houser04lly]

Thanks guys. Dang what a bummer. So its not a chance the cap is bad?

 

[dirty_max]

oh ok that makes sense now, never thought of that! let me tell you right now that i found out the hard way that a coolant temp sensor does not register if all that is near it is gas/vapor, yupp i had a c13 air locked pretty bad once

 

[Houser04lly]

So pull the plugs and leave them out and crank it later with them out still?

 

[dirty_max]

kind of doubt the cap is bad but still possible i would think. usually when the cap goes bad the hose will collapse over night

 

[sweetdiesel]

im confused as to why you would pressurize the cooling system?

if it leaks off, and no coolant on the ground it shows that there is coolant going into the cylinders.

 

[sweetdiesel]

So pull the plugs and leave them out and crank it later with them out still?

yes

dont remove the cap though. you want all that pressure on the coolant side.

 

[Houser04lly]

Understood. Hopefully I'm being paranoid the hose is hard but it def got softer after I spun the cap loose and it released pressure.

 

[sweetdiesel]

Understood. Hopefully I'm being paranoid the hose is hard but it def got softer after I spun the cap loose and it released pressure.

it will because you realeased pressure, if its still hard in the morning you got issues

 

[Houser04lly]

I only drove it literally like 2 min after I opened the cap so i will check it thanks for all the reply guys.