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The down side to changing the coolant now is you, will defiantly find the week spots!

If its burning it you will soon be forced to find out where its going ,as as mentioned the DPF will clog ,it should be doing frequent regens at this point! Soot level will go thru the roof and you will be parked! Just my opinion!

Those often fail due to due to heat ,the compressor working because of overtime air leaks is the air drier purging every fifteen seconds ? ! Or clogged coolant lines!

Ahh that makes sense now ! Mack supplied the dealers with a big dollar jig to reset the hub when these first came out ! How ever as usual there was a work around with the engine close to or on the static time Install the pump on the engine with the hub just snug or just loose with the spade in the timing window! Install the gear on the hub with the bolts in roughly the center of the slots snug ,then torque the pump center nut! and then recheck and set your timing as described before. pretty easy and can be done in the truck but much easier with the rad out but still doable if you want perfection! 7.5 is close so it should run ok ! And if your content with it fine ! Just sayin

Hope I'm understanding this wrong BUT!If you had no key on the cam and your were out 24 degrees you may still have an issue ! Cam timing and pump timing are two different animals! you can bend a few things if it ain't right!one tooth out on the cam to crank can create havoc! May run but not for long! Besides the proper way to put the cam gear on is to put it in the oven heat to 475 put the cam in the freezer and the gear will just drop on! Just sayin!

Yup dual exhaust is just a fashion Statement ! Not a Necessary money making item ! Want to make money keep it Simple! If you want a designer truck For looks Get your self A Pete! Just an opinion!

Yup agree ! also there is a second hose like that one on the under side of the inlet manifold! check on that too!Your best to use a heavily braided coolant hose OR the proper Blue heavily braided hose from mack land!

Sorry I didn't notice the vmac mechanical thing at the end of the first post My bad! Anyway john deer and others use a version of this pump as has been mentioned and also mentioned is a plastic lineup tamb that scerws in to the the window where the timing event marker sensor goes ! That in my mind would be adequate to run this engine ! as it were when you first posted you were a tooth off in my opinion 24 static ! I have also had to do this job up a billygoat trail in the bush and had to eye ball this job with no timing light set up and have had good success doing it! as I explained in the first post! YA its nice to have all the tools how ever you got to do what you got to do some times! and these old engines are A LOT more forgiving than the new Mack branded Volvo engine! Just sayin!

Assuming the the engine is timed at 20 then if the spade or screw driver like wedge is dead center in the window the engine will be timed to 20 the timing should be stamped on the valve cover Depending on Hp and model year 20 aint far off FOR A MECHANICAL engine! If its A vmac engine the Static timeing should be at anywhere between 6 and 10 You need to clairify vmac or mechanical!

All Good For NOW!

Did you use new coolant!? hope so the pitting is likely caused by poor Coolant the additives are used up in the old coolant! You best to use premix 50/50 coolants as you don't know what is in the water your mixing with straight coolant! interesting read here! https://www.ttnews.com/articles/nitrite-free-coolants-rise-due-more-aluminum-engines

usually they do one then the other if the guy is not local we do both Barrels ! Check for updates then, parts canon! If its warrenty ya got to be carefull where you aim your cannon you could shoot your foot! 😅 anyway guys we kinda hyjacked this thread off topic! Better stick to subject! Sorry Don!😇

Usually I here the resolution ! Like I said they usually work thru the possible up steam causes first the DAM programing up grades/ egr flow fuel doser crap /def doser issues Crystal build up ect, often caused by cracked ash cans and air leaks within that sector To rule out the obvious and , Then Canon the nox sensors, only way to be sure, AND MACK DON"T TELL YOU F all How you've fix it if the last thing you do is parts canon! If it fixes it you can attribute it to overpriced Dollar store Parts! Really ,No different than what we've been talking about with this possible blow by ,oil slobber issue,! fred

In the case of these new emission units sometimes you have no choice Nox sensors is an example Cheap Shit ! Hit and miss ! If eveything up stream checks out then Throw the TAIWAN part At it No Choice! We have some guys here at my shop that have good senses ! ME NOT included in this Group ! But have seen what they do And when they do it Most of This shit is just Magic To me! DON"T like working on it!Hurts My Brain! 🙄

Yup so true if its burning it you won't see it due to the dpf!( IF )you can get the Turbo off with out breaking studs ! You may see a wet Cyl on the exhaust ports by removing the manifold!

We Call it parts Canoning At our place! And is A last resort if you have exhausted your other resources!

My opinion! We"ve Been told ! The fuel level is staying consistent? oil sample ? I have seen the turbos bad from the get go! Chase The facts Don't throw anymore parts till ya got some facts get an oil sample! If ya got the where with all Build some caps for the turbo and pressure it up with shop air ! two peices of flat 3/8 plate two pieces of 3/8 ready rod and some old mudflap and You can make the tool in under an hour! with this you can check Everything you need ! even Valve guides! remove the drain tube from the turbo put 40 regulated shop air psi to it This will test EVERY nook and cranny on the unit for leaks you may also have to cap the compressor outlet on the thing if its plumbed direct to the compressor! Just sayin!

dosent mean the turbo aint faulty! while running at idle does it have alot of bloby with the the oil filler lid off?

around 500 I beleive ! 450 is a little low But! Turbo can cause this ! Exhaust goes by the shaft seals under high boost!we built a tool to cap both ends the inlet air and exhaust side and aplly 40 psi shop air to it, to find this very issue Haven't seen it happen for quite some time

First Check your crank end play ! if it's OK Say between 7/11 Thou ( Rough guidline ) then Tri running the Fly wheel sensor a little closer Back a 1/3 turn instead of 1/2 turn see if it improves you situation!

Good to see your still hanging out Bro ! Thanx for the update on the botched ideas floating about ! Ahh so that drier may not be committed to as a standard issue !? We have had to convert several trucks to twin cyl compressors due to the hi air draw of the /M trans in certain work environments, In these cases the sales poeple need to change the specs when ordering vocational ! Amazingly enough, The (common Rail ) engines have been relatively OK and almost problem Free so far here ! The main issues are usually Emissions or wiring issues due to our environment Salt brine on the roads and so dollar store lighting issues, That go along with newly Untested VOLVO LIKE parts bought thru whom ever supplies things! Because we live in a wet climate air drier cartridges need to be changed Often to protect The temperamental HI module and reg or you end up replacing them like cord wood! Don't imagine its any different In KW or PETE land!

Oh Buddy! Don"t get me goin didn't forget about it ! This truck is equipped with the teck water pump But not the compressor disconnect Odviously Cause IM sure that unit will include its Own Fricking module and Some Tecky relay to run the dam thing! And For Sure absolutely no Air Governor! Just some fiber optic Cable to magically turn it on or something! 😂And as a Maintenance Task you will need to replace clutch packs every three years or something! See Ya got me Going ! Stop now 🥵 f

Thanx for the Like ! But If It wasn't evident Already ! My Feelings Are the same AS yours! Hence the reason to post it! I appreciate the like However, Just putting it out there to show everyone where the Industry is heading. If That were not evident already ! Just Adding insult to injury with this new stuff Yup putting the governor on the air drier is fine! KW has been doing it for ever But they use the same 40/50 year old governor > Cheap! This new thing not so much! If you were smart enough to have not traded your old units in your in good shape ! However There are places now that Won't allow old rigs on the claim , trying to be or pretending to be environmentally Conscious ! Keeps the banks and the truck industry happy and the guy tring to make a living Broke! VOLVO TRASH

By the way you describe this it sounds like a torque limit switch wiring issue to me! if its a mack trans check the wiring to the switch on the range cyl on the upper back of the trans if so equipped! If u have access Vmac software check to see if the torque limit is enabled! Just sayin!

So We received a New Anthem to PDI this Week, So while doing the check over We notice ! Hey!They have removed the Air governor It is no longer on the fire wall were they have been mounted for the last 20 years! Hmmm, went on the the search for the little guy! Yup no where to be found , so we had the parts guy look up the air drier as this seemed to be the only place it could be . Sure enough the governor Is Now built into the Air Drier ! Grrrrreat ! Now when you have issues with compressor build and the like, there is now no cheap way to check anything !We looked at the price for this fine piece of equipment ! Only 1700 dollars !The cartridge A bargain At 300 bucks Never priced the Little governor piece However you can bet It will be Cheap🤑 and easy to find😨! Makes me wonder Why We have to over complicate the simple ! That being said It Likely comes down to captivation or The Fact the air on these newer units need Air to be dri to run the M trans and And the emissions components, this unit may be more efficient in someones mind ! However I can't see the savings in removing a ten dollar valve and 8 feet of plastic tube and replacing it with a 1700 dollar piece of crap that will likely Fail in three years Cause no one can afford the cartridge every year! Again I don't no the specifics on this unit It may be the best thing since sliced bread when dring air, However guess its going to be tested on our next truck sale! Still looking on the internet to see which company is selling this unit. and what Its selling features are compared to the older wabco or bendix units! will post it when I find it! SO I managed to find this unit it is called a SYSTEM SAVER HP AIR DRYER Didn't realize there were others out there, possibly worse. possibly better who knows anyway We will see how resilient it is in a couple of years! Check it out here https://f01.justanswer.com/diesel3153/c9883f39-a857-4660-8748-c053bac5015b_Wabco_dryer_info.pdf 🙄 IF IT AIN'T BROKE FIX IT ANYWAY! 😡