fjh Posted December 29, 2017 Share Posted December 29, 2017 Don't know how many of you have these trucks CL700 with cummins isx However ! We have a fair few in my area after the death of the V8 ! the one we have in the shop now we rebuilt approx 1000 hours on the build and we are working on the second reman head that has cracked is there any one here had experiences with these and any thoughts on WHY! other than it being a cummins ! WHY Are these heads cracking the cracks are at the injector holes out and between the valves! the EGR Has been Deleted dont know if this is causing too much heat ? Should we be replacing the injectors? are we setting the injector to tight? JUST seeking input! Experiences Please!! If any! Thanx Quote Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/ Share on other sites More sharing options...
Timmyb Posted December 30, 2017 Share Posted December 30, 2017 My brother has inquired about egr deletes and was told that it cracks the head. Which to me is strange because it’s essentially the same engine as an isx. Two guys have said the same thing, one a Cummins trained guy, and another well respected mechanic. Quote Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388508 Share on other sites More sharing options...
Hayseed Posted December 30, 2017 Share Posted December 30, 2017 fjh, Ask here http://rawze.com/forums/index.php He has a reputation for been the "go to" guy for all things ISX related. he also has a Youtube Channel. Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388512 Share on other sites More sharing options...
fjh Posted December 30, 2017 Author Share Posted December 30, 2017 (edited) Yup thanx for the site Hayseed! It does shed light on the situation a lot of his statements hold truth ! and each system design presents its own hertles for engineers ! THE venturi tube has been redesigned countless times on the MP8 they are still struggling to make it work properly! He is also correct that the Truck company s tend to keep things to them selves they really work hard on Captivating Everything! I am suspicious of the programing the guy got done here to delete this stuff as every cyl is cracked did they tweak the timing . did they tweak the turbo and so on if they just went in and told the putor to not throw a code for egr flow and washed their hands then this Is very likely the end result! I think we all have messed with this stuff a bit tried this and that I know Mack pro And I have for a fact on the grey engine It never amounted to as big a mess as this to my knowledge! In fact I had a customer that had a million on a 460 that saw my be 6 months of EGR and the truck Never faltered once ! no egr coolers failed no valves nothing! This here is volatile ! If the head is going to turn into a shower head every 1000 hours its going to be an expensive tune up every 1000 hours! i think this guy needs to rethink his direction. Edited December 30, 2017 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388530 Share on other sites More sharing options...
theakerstwo Posted December 30, 2017 Share Posted December 30, 2017 (edited) Timing is what i would say cracked the head after a tune of the ecm.Just talking to my self i think some of the tunes is ending up messing with the timing too much.Also the engines was timed slower back in 05 trying to mean eps standards and when the time slower the flame is later in the cylinger and may be flaming when it leaves the head.I am running a 1995 E7 in a bobtale and it has a thicker exhaust valve for the slower timing.Asfor as the isx i did not get into it that much before i retired and we sent most of the isx to the cummins dealer on count of cummins did not play well on warranty. Edited December 30, 2017 by theakerstwo Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388543 Share on other sites More sharing options...
fjh Posted December 31, 2017 Author Share Posted December 31, 2017 Ya Glenn I hear ya I Don't like takin on this shit, how ever my manager is of the mind that. God hates a Coward ! Its bad enough dealing with Volvo Mack on warranty Items! We asked the owner if He would reconsider the egr transformation ask I think that when cummins Sees this head warranty will be a laugh in the face ! all six were cracked turned into a true shower head! all the cracks radiate out from the injector holes in all sorts of directions . Quote Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388607 Share on other sites More sharing options...
fjh Posted December 31, 2017 Author Share Posted December 31, 2017 1 minute ago, fjh said: Ya Glenn I hear ya I Don't like takin on this shit, how ever my manager is of the mind that. God hates a Coward ! Its bad enough dealing with Volvo Mack on warranty Items! We asked the owner if He would reconsider the egr transformation as I think that when cummins Sees this head warranty will be a laugh in the face ! all six were cracked turned into a true shower head! all the cracks radiate out from the injector holes in all sorts of directions . Quote Link to comment https://www.bigmacktrucks.com/topic/52074-isx-head-cracks/#findComment-388608 Share on other sites More sharing options...
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