fjh

6 hours ago, Mack Technician said:

Convert it to neoprene. 

Yup Agree with this  statement your likley going to have to replace all of it, you may be wise to go neoprene!

the grease is a good set up (if looked after) Meaning you jack  the truck up  take the weight off the saddles and grease it! greasing with out jacking it up , for the most part your just keeping the dirt out.

On 3/28/2018 at 10:29 AM, Mack Technician said:

You shouldn't have to. It's more Gray Engine Amnesia. Hard to wrap my head around what is going on at the dealerships? Its the age of information and interconnectivity and folks can't get a software update? I'm guessing they turn-over mechanics so fast there is no archival knowledge being passes along inside the shops.

  

Finding people that give a rats ass about what they are doing for others these days is a struggle !  Its just a job , just a pay cheque, no pride in what little  work they do put out ,It is a real piss cutter trying to find good folks that want to work and want to please ,Having said that A lot of this mentality has been past down from the top mack / volvo its self is riddled with this same thought process ! Society in general  I Guess  Spoiled Brats! 

Unfortunately if the injector cup issue is an on going thing and has been for years  on all HP ratings of these engines up to this last   ear the change to common rail  seems to have changed things  (HOWEVER ) the jury is still out on these.  so far do good. in our area for the common rail ,WE Will SEE!  I am not holding my breath!.

Stat is you first step Id think

13 hours ago, RobM626 said:

I’m in the process of trying to work something out. The guy “assured”us the truck was in  “perfect” condition. We’ll see what happens. I hope he’s a stand up guy. And I hope this mack dealer is better than my local dealer at diagnosing and doing repairs.

We will see how that goes! 

FINALLY! 3 months that is  awesome response time !  

2 hours ago, RobM626 said:

I know right . I’m hoping I’m getting somewhere with fixing this thing. I’m still going back and forth with the shop about the clutch flywheel issue. I really feel like they’re trying to cover something up and don’t wanna drop the tranny again .

I just ordered another truck for a different business venture and on the way to New York from Iowa the truck broke down in Pennsylvania. I didn’t even get the truck yet and it’s giving me problems already!!!! I can only imagine the grief that one will cause me!

HA you think you got problems now! Good luck with your new acquisition don't get rid of your old one the vibration issue will be a non issue comparatively speaking! IMO! of coase!

Maybe he couldn't find a willing engineer!

On 4/3/2018 at 9:10 PM, fjh said:

Yup next step will be fuel preasure  ya need 20 psi + under load 25 to 30 is best!

Before you go to this trouble make sure  the fuel stop is going to the fuel on position!

and make sure the throttle is going to full  fuel on when you step on the pedal!

After you get the thing back together check to make sure it holds  pressure ! If its still s tad lazy after take that little cap off the end and give it a half turn in this will let it have a little more fuel when you first get on the throttle! it will smoke some ! Yup next step will be fuel preasure  ya need 20 psi + under load 25 to 30 is best!

Unfortunatly It is likly injector cup issue! The drain back valve is cheap  you could try it!

 I’m almost certain this truck has a bad cam or failed lifters. 

I Think your correct The spring loaded push tubes indicate that the engine is equip with ceramic roller lifters If all the push tubes were bent it indicates in my mind that the engine was over sped at some point In my mind you need to Replace ALL the lifters! This Ain't gona be cheap!

Hurry up And Wait!

oooooooya! Gota love it!

No problem just trying to help!  Check out the diaphragm if its broke fix it ! We can work from there I think its on par with your pay grade the hardest part is getting the screws out! 

Check your other post !

I realize  your new here but I think most of us  read all the forums no need to post in both spots the topic says what your after we will try to help if we can!You have to be willing to listen though! 

https://www.bigmacktrucks.com/forum/16-modern-mack-truck-general-discussion/

Is the diaphragm leaking ? did you try what I asked you try first? If so Do this first !!!! get the diaphragm fixed then we will talk! you have to remove the whole top of the govenrer housing as he does in the first vid to increase power! YOU DON'T  need to do that !! If the diaphragm is leaking you need to fix that FIRST ! The four screws facing back!  the four screws facing down Not Right Now! You don't want to get to aggressive with  the stop plate you can Kill the engine with too much fuel!  Just saying!  You were talking pay grade maybe just fix whats broke for now! JUST SAYIN!   

Does it smell like oil? Could be a trans cooler issue it would be black if it were engine oil fuel is another consideration!

It Won't be the first time there has been programing issues with this stuff! They run within quite tight perimeters. We did a power upgrade on a truck last year and now the engine brake is weak on the truck we are still chasing this! We did yet another power upgrade on another truck and the truck wouldn't start afterwards they installed the wrong data file at their end ! The customer WAS livid ! Customer had the truck booked for the next day.Of coarse this happened at the end of the day and you can get a hold of anybody in Mack land to get the issue resolved! NOTE TO SELF don't reprogam at the end of the day it may backfire on you,

take the 4 screws out it will become evident what you have to do  the vid above is similar how ever it is not necessary TO take off any more than the 4 screws on the out side edges and the the diphram is held together with a bolt rather than a nut if I remember correctly! the trick is getting the dam tamper proof one out!

There is a Vague possibility that the turbo can cause this issue if there is little blow by At Idle ! W eve had few turbos  over the years let gas by the shaft seal into the base !  Mainly on ETeck Ai and AC engines under hard pull conditions,  However  there is no reason why this can't happen on the  v8 as well !

Pull some rods and mains and look who knows they may be right!

Good your still checkin in ! But not good!  GOD This is ridiculous  Maybe they  will tweak the programing and do a download on your truck  Hopefully ! Is anybody saying anything?

Well yet another open ended story 

Simular to yours the idea is the same! it can be done with out total disassembly !