Mackpro

The AC high pressure switch should be a green and round and opens at 300 psi. Is someone installed the wrong switch or got it plugged into the wrong place it could make the ECM think the AC head pressure is over 300 psi

This was the unit we installed, it came with everything for the R model ( unit, compressor , brackets , condensor, drier , switches and hoses)But as Kscarbel2 said, get a factory AC compressor mount , as the ones that camee in the kit never stayed tight.

I installed lots and lots of the Red Dot "between the seats" units back in the R model days. Had the be the coldest A/C ever, never saw one that would get above 39 degrees output temp. Had to run them on low. Downfall was your elbow would smack it sometimes while shifting if u had long arms.

12 volt power goes through the air solinoid all the time. The engine ECM grounds it internally , when the ECM tell it to engage it breaks the ground and fan engages. High water temp, high intake air temp and A/C high pressure will engage fan. With engine off, shoot air into fan clutch and see if it disengages. That will rule out the fan clutch its self. Make sure you have system air pressure going to solinoid (130 + or -). Other wise have a laptop hooked up to it and check switch status to see whats engaging it.

Its more than an ECM swap. Your ECM and be downloaded to a 400 with no parts change however a bigger crank balancer is recomended. To go to a 427/460 you need turbo and injectors, camshaft removed and off set key way installed in cam gear ( or it will run hot, trust me it will). And of course download the ECM bumped to 427 or 427. This is on the eairler ETECH's 1998-2001. 2002 and up CCRS and ASET style has fixed cam gear key way so you dont mess with the cam. This is how the dealership/factory says to do it. You could always go to some aftermarket injectors and turbo. Just swapping an ECM is risky. Different software levels and options could really hurt instead of help

Make sure you dont have a A/C high pressure issue causing the fan clutch to stay engaged. We have seen problems when the defroster is on it also turns on the A/C compressor and if there is a blockage and the high pressure sensor is tripped it will turn on the fan clutch. Mack has 2 types of electronic fan clutches and 1 type of air fan clutch.

2004 was the worst year. They stuffed the then "new " EGR motor into the CH/CX standard frame with no room for a bigger radiator. 2005 and up they came out with the CHN/CXN with wider frame rails in the front to allow for bigger radiators. Alot of engine updates came out in 05 and 06 to help with various issuses. I would hold out for a CHN or CXN,

Hatcity is correct, on all ETECH style cylinder heads the bottom exhaust manifold bolt holes are drilled into the push tube galley. So oil can leak past the threads to the outside. Pull the stud out and put some good RVT ( we use the gray Mack RVT) on it and reinstall. Always use the correct stud and not a bolt or longer stud, we have seen people put a long bolt in and it hits the push tube and causes a engine miss.

These also might help. H-ring1.pdf H-ring2.pdf

Is a Mack dealership doing the repair? The "H" ring in the block that holds the lifter could be to high or turned. The dealership should have the tools to check "H" ring alinment. If they are installing ceramic lifter you must have spring loaded push tubes on the exhaust side. Cam break-in.pdf Camshaft.pdf

When you buy that DD-13 , dont act shocked when you find out they use the same NOX sensors, DEF doser, Holset turbo, same brand/style DEF pump and so on as the Mack/Volvo. Very few suppliers out there anymore. Our Mack/Volvo turbos come in a Cummins box sometimes. That said , I say its a crap shoot with any brand anymore. Just make sure you got a good dealership close by regardless of brand.

Rust? Really? I just pulled in a new truck off the lot, No rust here? Your dealership on the the Salt Flats or the shore of the Dead Sea? lol

Here is a fuse diagram for a 1999 RD with an ETECH engine. scan0006.pdf

Your timing code means you might need the new bigger balancer. Check out this service bulletin sb221037 3-4 code.pdf

Bingo, thats how your inside buddy at a dealership can do it..

There is a ground breaker on the firewall next to the wiper motor, All the grounds in the cab come through this

You have to have a dealer submitt a " Horsepower request form" to Mack for your truck . There are ways around this but you better have a inside buddy at a dealership that will help you out. The only trucks I have ever seen with the 460XT programs were CL's. The file is downloaded into the engine ECM.

Get the 505plus, Horton 2 speed fan clutch , get the Eaton manual 10 speed ( however you have to get the one with the higher torque rating due to anything bigger than a 505E) . Mack FXL front axle. Hendrickson air ride rear with eaton rears , Dont get the Rawhide, the visibility down the sides sucks due to the pipes, Looks nice but sucks to drive and yes I have drove a few of them. Every one who has ordered the disc brakes loves them. Just my .02.

On the AI motors , the engine brake wont work till 130 degrees oil temp, so if the ECM cant see the oil temp , it wont allow engine brake. Has the engine ECM software been changes of ECM been changed lately? Swap engine ECM with another truck, Also check engine ECM pins for antifreeze from bad coolant level sensor.

We have truck running here with 800,000 to 900,000 miles on then with the orignal DPF filters and have never been cleaned. We check the flow/back pressure and still good. Dont believe the hype of 4500 hours. Here at our dealership we maybe change 2 DEF pumps a month in the winter ( freeze and bust) and maybe 1 in the summer. Mostly NOX sensors we see go bad and a few DEF dosers too. The EGR diff sensor can go bad/ get clogged and cause DPF/SCR problems down the road. Im really shocked that we dont have more problems than we really do.

Is the Engine ECM and ACM ( SCR ECM) software been updated lately? There are alot of Mack Product Improvement Recalls going on now about software issuses. Has the truck been in colder than 20 degrees temps for days at a time? Is the lnsulating wrap still on the clamp on the flex pipe behind the DEF doser? We see this problem alot in cold weather. I think the software updates are probably the fix. Im heading to pick up a Fed-ex truck right now with same issue.

Loctite makes a "flange sealant" that we use in our shop. Never had one come back out.

other than the 460XT for the 98-2001 Etech's the only Aussie file i know of is for the 04-07 427HP ASET AI engine, It was hotter than the 460 but didnt meet the USA emissions. However back then you could actually call and talk to the programming guy at Mack and he could tweak things. Now we cant talk to any of the engineers at Mack.

Also a regen will "time out" after 45 min. Without VCADS/Techh tool you wont know if the soot level dropped or if the regen was good.

We have had 2 MP's here blowing oil out the blow by tube. One was a MP7 and the other a MP8. We did the compression test and cylinder balance test with the laptop and all looked good. Replaced the complete crankcase spinner assembly ( not just the spinner kit) and this solved the problem in both trucks. Also the oil spray nozzle can fall out of the bottom half of the assembly and cause other issuses. Its only a few dollars more to get the complete assembly.