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Well Quite honestly there Ain't much wrong with the core engine (shit Did I say that out loud) other than all the captive parts on it I prefer MP8 0ver the MP7 ,Having said that both engines have decent build attributes aside from the head/ injector cup issues, However the emissions crap as like everyone else's engines kills any profitability to be had , Cheap wiring / dollar store sensors Being the biggest issue .We just spent a whole two days chasing greened out wiring on def greened out in some highly improbable places. nice straight piece of wire Buried in the harness next to the trany no less than for spots on the wire just ridiculous .Totally unexplainable other than cheapass wire! Rant of the day!

So you first posted this on the 28 of feb ! Again I say So much for The MACK commitment to service and Uptime! Is the truck still not on the job? If not I think its time to go higher up! Voice your dissatisfaction! Unfortunately Its not the dealers fault and they are likely doing all they are allowed to do ! This is the point where the squeaky wheel needs to be greased !Phone the 1800 get satisfaction number and get the ball rolling! Throw the commitment to service and Uptime in there face Ask em what happened to that !!!!

IMO either seal pictured is a good seal national and c/r are descent seals The stemco voyager seal is also a good seal ! And I don't want to start a pissing match here however, IMO again, if your offered a stemco two piece turn and run! Over the years this seal went from my favorite to my most hated seal, Now a days just an observation , if I find a leaking wheel seal on a unit 7 times out of 10 its a stemco two peice I Won't use one unless I'm Desperate ! Just An opinion!

Well I for one would like to hear the resolve to this issue if you do reach the fix for this please post it! There has been quite a few posts lately that end up with no resolve!

Check plastic line from the fuel pump to the head for wear and tightness check the jumperline betwwen the heads for leaks and tightness!

In my opinion! You can stuff as much air down it you want , It anit gona give ya much more power unless the fuel is there to go with it!

These can top 0ut @ 40 psi with xt file rarely seen em go over that! If you don,'t have fuel you likly wont get any more boost

Yup NO STONE UNTurned!

You need to identify its a problem no point in throwing parts at it ! changing the same part over and over is obviously not working! Like Kevin said get the District service manager involved (what do you have to loose!) Note ! The RD is not the nicest thing to pull the trans out of so a higher than average in and out time would be justified !

Guess there stumbling again! We did a horse power upgrade on a unit here And ever since the engine brake power has been cut in half been chasing this for months very little support for this issue as well. (unexplainable) I guess . Or its just imaginary! THATS IT! You have an over active Imagination!

3/8 air line connected to the inlet is all that is required there I believe! the t fitting is for torque limiting!

Worth a try! fly wheel run out can be checked with fly wheel on the engine! with a dial indicator! balance has to be done by a machine shop or by the dinosaur method I have stated just somthing else to check! (leave no stone unturned!) Highly doubt the clutch is hurt!

Ageed here your issue is not uncommon! oil preasure / flow is the key! does it have an external oil source Kit on It!

Hi did anyone think to check the balance of the flywheel? It sounds like you have had many clutches if so. then if the fly wheel has been surfaced lots or even changed it can change the balance of it just somthin to think on We once chased an issue in our shop similar to this on an E6 it turned out to be the flywheel! found it by mounting our input shaft dumbie in the vice put the fly wheel and pilot bearing on the spigot of the dumbie shaft and the fly wheel would always fall to the same spot like an out of balance tire! ( The wonders of gravity) or frustration of it!

We also have half a dozen running around here And the same result ! To my surprise few issues in the fuel system department, we changed a couple of rail sensors so far that,s it That s in keeping with the on going cheapass sensor thing that has always been a thorn! (May) have a winner : we will see! As for up time ! ?? They talk the talk ,but its the walking they have trouble with! They tend to stumble alot!

Yup me to a PETE a real mans truck! Just ask em! Same dollar store wire, same dollar store sensors on a new and ELcheapo cab desigin ! Just like everyone else having to run the same stupid crap for emission related issues!

Agree however if you get the wrong eservice guy this can drag things out. you got to follow their protocol or you don't get paid! Its a rock and a hard place for the dealer! Having said that. it is a 2018 likley common Rail and haven't estabished a track record for failure s yet!

YUP Macpro WE TEND to blame the wrong things some times! call a spade a spade!

Yup What they said! not impressive !

Try putting it in 1st then throwing the switch!

No argument here on this Quote how ever Everything changes when you throw an auto trans in the mix which every one seems to be pushing .They seem to be hell bent on creating stupider people here ,they are providing people with so many conveniences abs atc vsa bla bla bla ! Pretty soon you will have nothing but idiots driving 80000 lbs down the hyw. The upside to that is half of those units will be in the shop having repairs done to all the crap they are piling on these units ! Those will likley be dealer specific vehicle ECUs , As Rockwell pointed out A derate to 5 mile an hour on 55 mph hyw is down right dangerous for someone who knows how to drive Just imagine it happening to those that don't , guess the point is that it seems All manufacturers are trying to captivate everything ! there my be a cummins dealer on every corner but not always a KW dealer or a Pete dealer or a Binder dealer and with all the automation your married ! Just saying

I would like to point out ,If You do a "tune" you will likely limit your self even more than you are already The Mack softwear is almost identical to Volvo how ever From what I understand Unless your a Dual Dealer we are allowed to see what we have paid for as a dealer !And yes "ALL THE NEW STUFF" is entrapment You ARE Married to the brand! NO matter what you drive!

yup all the best Barry !

If you are concerned clean and dri the bore , I have put a small amount of lock tight at the very bottom of the bore however I also would not be too concerned as stated 00,2 is still ok don't forget the liner will likely swell as the engine warms , It ran before it will run again! Just sayin!