pressure in the coolant system

[DIESELMAFIAPER.LB7]

Ya I'm with Casey GM aid if there still in there they are sealed also the tech that did my warranty injectors sealed them.know that for a fact there sealed also have to remember Mike my cups an injectors were done 70-80k ago well a couple cups anyway :thumb: but what you did was smart you may as well have cleaned them up while you were there. Anyway back to the point I noticed my lower radiator hose is real soft compared to the upper now why would this be?

 

[Mike_S]

How do you know they are not sealed? How does it not leak if they are not sealed?

Not sealed as in the factory does not apply a sealant. When assembling parts with virgin aluminum and such they don't see it as being necessary. However when the engine is run and things move and find their happy spot so to speak a sealant becomes necessary IMO. The injector cups have 2 fits into the head, the small end is an interference fit within the bore that it mates to, however this is not the sealing surface. The sealing surface is the taper section just above the straight bore, given this fact the taper can break its seal and the cup still stay within the head held there by the interference fit of the straight bore. This is why I feel it is a good idea to remove and clean and reseal these surfaces. But to each his own, I don't claim to be an expert, and I definately won't cram advice down anyone's throat. :thumb:

Anyway back to the point I noticed my lower radiator hose is real soft compared to the upper now why would this be?

Curious, is it this way with the cap removed and the system pressure relieved? Could be as simple as the 2 hoses having different wall thicknesses...?

 

[DIESELMAFIAPER.LB7]

Not sure ill have to check them with the cap off an could be different but when tearing the motor out _ didn't notice any size difference?

 

[DIESELMAFIAPER.LB7]

With the cap off The lower is still softer then up top

 

[Power Shift]

So was it just the cap? Or was it the cups? or HG?

My '01 has a pressurized cooling system, just like you described, not coming out of the overflow or loss of heat/overheating. I just hope mine is the cups as i have to dig into soon to replace a couple of injectors.

I am curious as to what ya found--

 

[770JOHNNYW]

I pulled all my cups out and coated the bottom of them with green locktite!

 

[DIESELMAFIAPER.LB7]

Its still doing it but not as bad i changed the cap hasnt pressuirzed as bad still does when im really on it hard? which makes no sense to me if its gaskets or cups it will pressurize no matter how hard or easy you are on it. My truck will not pressurize above normal unless i run the big tune balls to the wall for a night???? so unless im pushing something under higher boost? (which shouldnt happen with studs 45 psi??) i had the valve covers off pulled injectors and cups were fine didnt see any blow by on anything motor was pretty clean inside still:thumb: so im at a lose here could the water pump have something to do with it

 

[DIESELMAFIAPER.LB7]

So was it just the cap? Or was it the cups? or HG?

My '01 has a pressurized cooling system, just like you described, not coming out of the overflow or loss of heat/overheating. I just hope mine is the cups as i have to dig into soon to replace a couple of injectors.

I am curious as to what ya found--

intersting for sure let me know what you find i didnt see anything wrong but im not going to tear this damn thing down again till something either shows me whats wrong or i window the block:spit: im tired of tearing into the damn thing it drives awesome just seems to build up more then normal pressure?

 

[68skylark455]

Don't feel bad. We don't have a pressure issue but it burns coolant-once in a while, not all the time and sometimes its alot but then just quits all together??? Coolant stays full for 2 weeks and then it starts again, and you can smell it burning. There is no coolant in the oil, i bypassed the 42 coolant hoses and it quit. Hooked them back up and it was fine for a week then started again. I should be getting it back this weekend and maybe I can find it. makes you want to say damnit.

 

[IOWA LLY]

Did you have the heads surfaced when you installed the new gasket and studs?

 

[Relentlesscummins]

What gaskets did you use or did I miss that? Just cause it doesn't seem bad it can be very bad and doing interal damage.

 

[DIESELMAFIAPER.LB7]

grade c gaskets and i should have some signs no coolant comes out of the glow plug holes, only pressures up once in awhile?, an no brunt coolant smell out the exhuast coolant is clean as well. Also its been doing this for almost 15k miles so if it was bad something should give by now. an no iirc i dont believe i did, had them checked out an they were fine still should have but correct me if im wrong here but gaskets will either A: leak somewhere B: build coolant system pressure constantly not only when im hard on it? i could be wrong there who knows

 

[Relentlesscummins]

Mine had same signs as yours and they were f'd up

 

[IOWA LLY]

What shop installed the head gaskets and studs? Sounds like head gaskets to me.....

On edit: I see it looks like you installed everything. What torque spec and procedure did you use?

 

[01gatormax]

mine had same problem only when towing hard. it started 1st of November, i noticed the temp was slow to rise and stayed @208 towing @80 on hwy when i got in traffic and slowed temp went to 165+- and the hose would get really hard and coolant would get low just enough to makethe light come on.when relived pressure it would refill tank all but about a cup from full. I replaced the thermostats and fixed the temp but it was still slow to warm up and the hose was hard. put a pressure tester on the tank and reved it up and the pressure would climb 18/ 20# then the water pump started leaking christmas eve. replaced pump and housing still had same problem. head haskets were bypassing between cylinders and cleaned the carbon off a couple of cylinders for me. waiting on the ARP studs to come in from alligator performance (2 weeks) and will put her back together this weekend. resurfaced heads and pressure tested C gaskets fluid damper and driver side manifold,and pray she last another 200k also replaced all the fuel lines and hoses on the engine while down. i bet you will find a bad HG good luck

 

[bullfrogjohnson]

What shop installed the head gaskets and studs? Sounds like head gaskets to me.....

On edit: I see it looks like you installed everything. What torque spec and procedure did you use?

X2... Have you done a retorque?

 

[DIESELMAFIAPER.LB7]

Followed what most everyone has done three steps to 125ftlbs an let them.sit a night rechecked them an retourqe no never herd you needed to an arp doesn't call for it. An I was actually thinking I might have a thermostat sticking closed though my truck never gets hot so

On edit: I've had a bad headgasket before this isn't the same at all there's not as much pressure with this as there was with the gasket I just find it curious maybe I'm paranoid I dunno

 

[Mike_S]

Too bad we don't have a coolant pressure gauge...lol! Seriously, I'd just have the coolant hydrocarbon tested, and go from there. Could be nothing, or could be serious...either way this could be motivation to get that other block all done and ready! :woott: :thumb: :rofl:

 

[bullfrogjohnson]

Did you do the 3 step torque procedure 3 times?

 

[DIESELMAFIAPER.LB7]

no just three equal steps to 125 like arp called for an as a few others on here have done

an ya well i geve trent my block waiting for him to have time to come back up this way should be this saturday(not that i have money for rods+pistons yet anyway) should come go for a ride in his truck with tripples :thumb: i can make a coolant pressure gauge or borrow one from someone i could get one see how much psi I really have it should have like 10-15 psi shouldnt it i cant remember what they're supposed to have

on edit: im going to find a coolant pressure guage an test it out an make sure nothing serious is going on could be in my head to :screwy: