Mackpro

I can pull the specs if you got a year model?

What year and model?

Heres the differences in 427 , 460 and 460XT. This is for the 1998.5 to 2001 ETECH's. You can print and compare torque curves and spec's. ETECH 427.pdf ETECH 460.pdf ETECH 460XT.pdf

Boost pressure seem somewhat OK. Kinda low though. Be sure to pressure test complete intake system. Early ETECHs had problems with intake gaskets blowing. New gaskets are steel core. The air compressor intake is also on the boost side ( pressurized) and is known to leak off boost . Adjust valves, Check air cleaner and muffler. Check fuel pressure going into block, should be 80-100 psi scan0598.pdf

Walker part # M100463 is what we had put on a few truck. I think it was $120

I got a part number for a Donaldson or walker ( I can't remember) that is straight through and not loud. I'll be by the shop Monday and find it

Check the ring mount on the front of the air horn on the roof. We had a new 2018 last week that the air horn ring was broken and it sounded like the exhaust bracket was rattling

Never reuse cam gear bolts on a MP engine ! LOL

There is a Mack service bulletin on this. There is a new updated bracket assembly to fix this issue.

Only on the CCRS ETECH engine . 2002-2003 year model. We went from 460 down to 427 to get rid of the waste gated turbo required for the 460 hp program. We did this to several trucks. Also we did a 2014 505 Plus down to a 505 due to the extra torque causing vibrations

I think the EPA has started limiting the number of glider kits that are completed at places like Fitzgerald's. There was a big article about it earlier in the year.

You have to pull the head . They come down through the top of the block, there is a special tool that installs them to the correct depth and makes sure they are straight. His is a good time to use the tool to check the other H rings for proper depth

We had a customer take his 2011 MP8 up somewhere in Illinois And get the full delete done , I think it was around $3000. They said at the time they could only do the non-OBD trucks, which means only trucks with the 9 pin diagnostic plug. Not the rectangle OBD plug.

2004 Z71 Tahoe. It's been a good one. We actually had 2 at the same time

This is true with the Mack MP engine diagnostic software (PremiumTech Tool). But with the "Grey" motors not so much. I don't want to go into detail as Mack/Volvo/EPA might change the way we do programming on the "Grey" motors. But let's say we're ok for now! Lol

Yep. Wife won't buy anything but large American made steel SUV's for this reason. If we were driving anything smaller , the deer would have been in our lap. We were gonna trade it in next month as we're approaching 300,000 trouble free miles on the Tahoe. Uses no oil and has been perfect.

Yep! Insurance will probably total the Tahoe, the glass guy charged us $177 but wrote it up like we paid $308. So we will get $308 back from the insurance company. Which will about cover the speeding ticket . Lol

I can pull the exact data and software numbers off of the vin of a XT engine ECM and compare the numbers to a regular 460. However I'm vacation for 2 weeks and won't be able to access the system. But I might turn around and Head back home. Made it 150 miles from home and hit a deer. Took out the windshield , fender and door of the Tahoe. Lucky a guy changed the windshield for me in the middle of the night and we continued on. 20 min later get a speeding ticket , 72 in a 55 , he did knock it down to 60 in a 55.

The XT programs are still in the Mack Mainframe for the VINs they were assigned to. So if you own a truck with the XT file in it , that came from the factory or was upgraded later and Mack knows it's supposed to be in your engine ECM , your still ok. If your ECM shorts out , you can get a new ECM programed to your original. Mack is just not gonna add the XT to anymore VINs. However , if you kept bringing in your 460XT truck with a bad ECM, the dealer can keep programming new ECMs with the XT file . Or you could have a bunch programmed ........ for spares .........if you know what I mean,

Unplug the ecm , then install new fuse to rule out bad ecm

We had this issue when the Wabco 318 air compressors first came on the ASET AC engines back in 04 and into 05. I talked to their engineering dept and they were aware of the issue and did a redesign of the head and valves and it stopped the issue. However on the MP engines we still get carbon issues on the Wabco compressors but mainly after several (5+) years of use. Hopefully they can help with you issue.

Our local 1999 CL with the 460XT with Mack 18 speed trans and Mack 92 series rear axles. Customer had a complete engine rebuild done 2 years ago . I believe it was at the million mile mark. Still runs every day as he lives only a mile from my house. Here are the only problems I have seen with the 460XT. Be ready to change rear motor mount bushings/bolts about every 9 months if you use truck every day. Leave the torque limit switch on the trans hooked up. Our customer has his unhooked, and about every 12-15 months he breaks a through shaft or a axle shaft. No engine problems at all. The CL has the radiator to handle the heat. On 2000CL713 truck, I sent the 460 and 460XT HP upgrade request to Mack yesterday and only the the regular 460 program is available anymore. No more XT upgrades.

AI engine turbo and injector part numbers for different HP levels. scan0588.pdf

On the AI engines, the 350 and 400 are the exact same engine ( turbo and injectors and so on). A dealer should be able to request a HP upgrade to 400HP to Mack. Which would also be a good time to update all software in the ECM's.

The newer Macks have no regen switch and is done through the Guard Dog cluster. On all Macks , you can only do a regen if the truck/ECM ask for one. Otherwise you need the Mack software or an aftermarket Diag software that allows regents.