Racecorr

Ok fellas, after a good flush that produced about a cup of some unidentifiable scale and a new oil cooler inlet screen, my truck has ran flawless. Thanks for all the help. 

Well fellas, after a flush that produced about a cup of some unidentifiable scale, and a new oil cooler inlet screen, my truck has been running the last 2 months with no problems. Thanks for all your help. 

8 minutes ago, fjh said:

I doubt the screen is your rad issue you original post was coolant push was it not?

Well, not really a push, because it hardly ever pushed out of the cap. It's more like a surge or something that is causing the radiator to "bulge" and split open. 

Hey fellas, just to give you guys a little refresher, 07 E7 AC  I've had 5 radiator failures. I've had an in frame done with new liners, pistons, and 2 new heads, a new EGR cooler, new air compressor, updated expansion tank, and countless bits of advice. The one thing I found intriguing was someone suggested that a blocked oil cooler screen could be the culprit, I had my mechanic check it out and he told me that the screen was about 15%-20% blocked. My question, is that enough blockage to cause all of these radiator issues???

Ok fellas, I've heard from my mechanic and it appears to him that the screen is about 15%-20% blocked. Question, is that enough blockage to cause all of these radiator problems, or should he keep looking for the culprit??? Also, I've found out that the motor is a AC, and the water pump has been changed, does anyone know the difference between the two pulley sizes??

On 20/12/2017 at 9:02 AM, fjh said:

Now As for the coolant filter we once had one of  these and it was low liner protrusion  same symptoms  YOU HAVE rad cracking AND WOULD BLOW THE FILTER OFF Last resort  thought! throws up a red flag for me! check the screen if its not there your going on a head trip in my opinion!

I did have that filter split on me...and maybe also a lower hose split...but that was before the in-frame, and the same thing was said, bad liner...so we may have been dealing with multiple issues, the bad liner causing the filter failure, and something else causing the radiator failure... maybe?

On 19/12/2017 at 9:00 PM, Mack Technician said:

Only thing not consistant is the coolant filter blowing out. It should be on its own closed loop with the water pump, as far as I can tell. 

That was before the in-frame. 

I just got off the horn with my mechanic..and he told me about a service bulletin about the thermostat housing, apparently the OEM housing can cause a surge. I think we may be hitting on something here... because it seems every time I split the radiator it's after the truck is shut off, and it always seems to split the upper tank from the radiator itself. Thoughts?

33 minutes ago, fjh said:

GREEN WTF  ? Does the engine have two heads or one big head the MP engine will have MP7 or MP8  on the intake manifold RED engine

THE E7 will likely be painted GREY with two valve covers ,How ever if you are color blind it could be brown or pink or yellow or painted intentionally a different color ! If so identifiable by two valve covers! 

Gray check the screen at the cooler pipe

Red possible injector cup issue! as you have checked the EGR cooler!

Thank you for the clarification...it does have 2 heads. 

1 hour ago, Mackpro said:

If grey motor then I'd look at the screen in the "Y" hose below the oil cooler.  And also if a AI water pump was installed on a AC engine it can cause wired issues. Pulley size is different between the two models 

What if it's green?

21 minutes ago, Mackpro said:

Is this a ASET engine or early MP7?

I'm not sure..E7 is all I know for sure. 

I've changed numerous caps. 

HiNew to The Forum here, thanks for your time guys. I have an 07 Vision that I bought used with about  450,000 miles on it. I bought it specifically to work out of town, I hired a driver and the thing ran flawlessly for about a year. One morning I got a call from my driver it appears is that the radiator has started leaking. I contact Mack get a new radiator have my mechanic install it. About 3 days after its back on the road my driver calls me and tells me that the radiator has started leaking, I called Mack they tell me that they've had problems with this radiator they warranty it send me a new one and my mechanic installs it in the meantime we lose the contract out of town.  Once the truck is ready to go I fly down pick it up and bring it home, it sets for the better part of a year until a friend of mine needs a little bit of help around town so I put my Mac back to work. After about a week pop there goes another radiator. Mac is already told me that they've had problems with these radiators I contact my local Mack dealer and they sell me an all-metal one, I figured that that's going to take care of the cheap plastic and aluminum radiator problems that I've been having. The truck starts acting goofy overheating but not consistently, itstarts to spray coolant out of one of the coolant filters is starts to puke coolant out of the expansion tank, and my mechanic says the problem that we've been having is the EGR cooler, so we replace it. Once its back on the road the truck continues to overheat my mechanic can't figure it out, so I take it to Mack and they tell me that I've got a bad liner. I get an in-frame done with new liners,Pistons, rods, 2 new heads, and I we've solved the problem of my cooling system pressurizing. I picked up a new contract for more work out of town, and as I'm delivering the truck pop there goes another radiator. I contact Mack they send me a new radiator I contact my mechanic and I tell him this is the last radiator we're going to put in. He spends a good amount of time trying to figure out what is wrong and why we keep losing radiators. He replaces the air compressor, an updated expansion tank, and Hood assist Springs. He is now certain that we figured out what is causing these radiators to split at the seams. After four and a half days of work pop there goes another radiator. So just to refresh you guys that's 5 radiators, and EGR cooler, and air compressor, and expansion tank, hood springs, and a complete in frame with rods, Pistons, liners, and two new heads. Any other ideas what could be causing these radiators to split at the seams?