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Our Freinds down under seem to have a better handle on the needs of the trucking industry than here in north America ! We don't pull trains here however we do have some steep terrain may be not a big enough market for their liking! Who knows ! If mack still offered the MP 10 here they would still sell just not as much as they would like !

Yup very possible!

boost leak check all the hoses to the after cooler and engine

After you have checked your simple stuff the rad cap ect ! Most common issues on this subject are EGR Cooler Failing Second in line are the injector cups can cause this however usually also give other issues hard starting slow to start indicaters! Water pumps fail once in a blu moon similar but not the same symtoms with over heat . our first check would be the EGR cooler

Most of the changes in gearing here we used to do was to change to 4.64 due to the V8 ! Anything over 400 would eat the 4:17/ 4:42 ratios for breakfast in the offroad type settings here! lots of hills! Used rebuild lots of these top gear sets would pit out and break! the above ratios were a simple top gear set change!

assuming its a Mack ! not enough info what year and model of truck! engine model mp7/ 8 or gray E7 engine!

Does anyone know why GM still makes GMC / Chevy same truck different trim ! Volvo/Mack Same truck Different Cab and hood! Marketing strategies I guess! Its been going on for years firebird ,Camaro , chevlle/ boulmont just to name a few!

Im not trying to be a smart ass here but you do have a 12 sp trans and half gears with a 12 speed! a half gear lower to low? just asking! your sweet spot will likly be 1400- 1500 the 1600 will be best fuel economy with the half gears you should fine something that fits with the 3:87s!

Good Call pro ! And pay attention to the dollar store pex clamps that everybody are using on the the charge air these days They are garbage ! if in doubt replace them with real clamps you'll be glad you did! seen these fail on lots of units specially on the hot side of the turbo !

they rarely cause issues!

My opinion ! Top of the list , you need to check for exhaust leaks turbo gasket exhaust gaskets (broken exhaust bolts and boost leaks to start with , broken clamps bla bla. check the intake manifold at the front below the egr mixer tube for broken bolts and for a crack associated with a broken bolt front lower bolts have a tendency to break! After cooler split!? The egr cooler my be plugged this will cause the egr valve to open to much and result in little to no boost as the ecu is detecting low flow also the dp sensor on that circuit is susceptible to plugging again low flow issue . bottom line lots of shit to look for. those are just a few . just a few places of many to look!

12 speed is a dandy dump truck trans 5 speeds for reverse is a wonderful thing ! some Things to watch for have been mentioned ,to add to the list pull the counter shaft caps check the rear bearings For pitting replace as necessary these can be done with out other disassembly, if you are removing the air shift to re oring check the reverse gears, the idlers also can be replaced or turned around if need be to reused with out to much disassembly the reverse gear and these idlers used to take a beating when drivers were impatient and didn't wait till the truck was static before shifting to reverse! otherwise The trans was decent!

(If you're paying $10k for a clutch job, you're getting robbed ! ) THATS THE POINT! Flywheel grind ! If someone walks in off the street to have a clutch replaced and you have no idea how many times the clutch has been done you replace the flywheel for your own safety then you can Provide the whole job with a solid warranty with out worrying about a backfire !As for using a recon actuator Our luck with most ReMack Parts is not the best! Not the most quality stuff in my mind I would just rather start over! start from scratch ! And not have to do it twice! Just an opinion

The red shut down is set to come on with the 3 sensors Joey mentioned those three can trigger a shut down you have a minute to decide! How ever we used to disable low water shut down as it can be a PIA ! the light will still appear but the no action was taken to shut down if disabled! check the wiring over near the oil cooler the clamps tend to rub the wires there ! be sure your not over heating! Good advice by Glen there too Cover the bases!

Shit ! I my country that's been going on for Years The generation of Wimps is here ,get used to it! everyone wants to sit on there duffs and play video games! lazy shits! no motivation ! How ever they would end up wore out and grumpy just like me , So who is the smart one ? Guess its not me!

Haven't had covid yet So I wouldn't be able to tell if I had it with the symptoms you describe Aside from the dizzy spells ! I have had most all of those symptoms for the last 20 years ! However be patient Bro All things take Time !For Me Tired and grumpy is the norm It is a natural occurrence when you work for a living I think! And some Times a Tough thing to push through! Just Keep pushing!

Hope🤞fully it stays that way!

This here Idea from the( bunny from down under )😂 makes some sense Its much easier to find a leak under pressure Than under vacuum! I have done the bunny trick also and if you have an external leak! you'll likely find it! It sounds to me its a leak behind the primer pump could be a check valve in the pump or secondary filter by the description of the time line! As others described crack in a filter head or filter can a bad line ect! Just my opinion

Yup back when a truck was a trucks wiring was labeled properly and things were alot simpler and less captive! neat post! Paul do you have any pics of the V8 with the Vmack fuel pump mounted on the engine ! I have never seen this set up as the Vmack drive by wire set up was never offered in North America! I would like to see how the econovance was incorporated in the valley of the engine! thanks

Always pays to get all the bolts started by hand before running them in with a wrench! that said depending where the bolt is it will likely be fine! what do you have to loose, give it a try!

Check all the plastic return lines to the head and the little jumper between the head as well, also have your oil sampled for fuel the orings on the injectors can be an issue! just another place to look if all else fails!

You may be looking at injector cups and injectors at this point has any of the shops done a combustion in fuel test?

Don't think they have thunk that out yet !Up in BC Canada Were building a new Dam to Power All the New electric Vehicles were Gona sell!🤪All electri By 2030 !🤓

Joe in my opinion You got to be carefull with that test! I have seen more than one pump shaft seal blown out due to over pressuring the system ! had it happen to me more than once! Wern't a happy camper!😡

We ran into one the other day where by the little relay failed and was replaced but installed back wards still wouldn't start (Wrong polarity) swapped the wires and it started think this was mentioned earlier how ever worth saying it again! Its polarity sensitive!