Mackpro

On a 1998/99 to 2001 ETECH, there is no difference between a 427 and a 460 except for the download. Jumping from 300/350/400 up to the 427/460 levels does require off set cam gear key way, turbo and injectors and download. On a 2002 and up CCRS ETECH engine the difference between the 427 and 460 engines is turbo and injectors and download. All CCRS, ASET AI/AC engines use a straight cam gear keyway.

I always vote for cups and or injectors. Here is the new info on inspection of your injectors. Look closely at your sealing surface of the injectors , Use the graphite paste and and new injector hold down bolts. Check for cracked tips on the injector with a magnifing glass. Cracks run up and down of the long tip of the injector that goes into the cup. And some times the whole body of the injector just breaks in half. Of course it could also be the the fuel pressure relief valve in front of the head, the filter fuel stand, the fuel supply pump or just a leaking fuel line on the suction side. Look for fuel dripping from where the supply pump bolts the the power steering pump. Seems like 90+% of the time its cup or injector related in our shop. Conical replacement info.pdf

On the buzzer, make sure the power divider is not turned on or the air bags are not lowered. On some trucks this can be programed to turn the buzzer on.

Yes, our guy said it was a MP-8/D13 that they were adding the NG to. And yes, he said its downfall is that it will have SCR on it. Cumins/Westport looks like the way to go for now.

I see the UPS natural gas CXU's through here all the time. They seem happy with them. We just sent a guy to school on them. Cummins sure has the market cornered on the class 8 engines for now. Our Tech that went to school on them says the Mack MP natural gas engine is being tested now however its a hybrid and runs on diesel and naural gas both

Side cover fill plug 20953259, The new plastic side covers are know to leak. They came out with a new cover kit, 85136434 side cover.pdf

Throttle pedal code. But the engine should not quit if this code goes active. You can unplug the throttle pedal on most all Macks (ETECH engine and up, cant remember on the VMAC series engine) and the idle will go up to 900 rpm but never die.

Is your 2003 460HP an ASET (EGR engine)? The 2006 you mentioned is a 460P with 487 HP is a ASET engine. Usually 2003's are ETECH (CCRS) engines. The two engines are wildy different and your better off with the ETECH engine. Unless you like changing high dollar EGR coolers and valves and turbos. If your 2003 somehow does have a ASET 460E (460HP) it can be bumped with a software download at a dealer to 460P. No parts change needed. Send we the last 6 of your VIN on the 2003 and I can see what can be done.

Sorry for the late responce but you can now sign up for Mack Parts online system and view the same parts breakdowns as the dealer. Dont know whats involved in signing up but heres the link. http://www.macktrucks.com/parts-and-services/parts/select-parts-purchasing/

Whats the actual code #? Mack has a bulletin that comes out every week or two with common problems and fixes, even for older trucks..

The factory radios are hooked into all the ECM.s on the truck. we can reprogram the radio for different issuses and there are even malfunction codes that show up on PTT for the radio. We have lots of complaints on the factory radios with the hand free built in.

What year trucks?

Changing a TRW box on a 2014 CXU today. We have no problems out of the Sheppard M series on the new trucks. One of our death wobble/tire wear problem CXU's had its steering box changed when it was a month old.

Sheppard has their service manuals on line for free. Kinda hard to find them on there though. Im going with air in system or something floating around in resivore clogging supply to pump. I assume its a 92 series gear , the M series sometimes had places to bleed the air out.

In my notes here, My DSM said to make sure the caster is 3 to 3.5 degrees before installing the bronze bushings and steering stabilizer. This axle has been around and not changed since around 2005. Really dont know why we are getting all the complaints of "death wobble" and tire wear. Dont know what has changed lately. We also have some bad cab shake complaints on the full flaring day cabs whne following a van trailer. I have test drove and verified the cab shake on a new day cab and it was scary! mack does have a fix for that issue.

Its just not offical yet and has to be approved by a DSM ( to get Mack to cover it under warranty or goodwill). We put the bushings in ( dont ream them, you want them tight) and install the steering damper/stabilizer. If that dont fix it, they have a new thicker front axle to install ( but this is rare). The newest trucks coming out just started having the heavier axle beam and bronze bushings. This all came out about 2 months ago but like I said still not official.

There are some new top secret bronze bottom king pin bushings that just came out. The dealers DSM should be contacted and get the new bushings installed. Part # 4103-7421416557. This is for the FXL sealed hub style axle.

CHN/CXN had ASET E-7 engines, CXP/CTP had non-DPF MP-7 engines only, then latter came CHU/CXU, they had MP engines with DPF then latter SCR was added. The CMM/CMH I have no idea, are thoses export models?

According to the Mack tune up manual, you should be getting 24-32 psi. also check your intake manifold gaskets and the air compressor intake piping over to the intake manifold.

All AC/AI ASET engine take the straight key way regardless of HP level. Only the older ETECH 98-02 ( pre-CCRS engines) used the offset key ways. The 355/380 puts out the same torque as a 427HP. To bump any higher you gotta change the turbo and injectors and do the download. If your gonna do that might as well go all the way to 460P. All parts and labor will get close to if not over $5000

Had a new 2015 CHU in our shop on Monday and the DEF guage would not work. After spending all day on it we finally found that the Turbo actuator had a short in the J-1939 communication line and was somehow affeccting the DEF guage. Turbo/actuator was working fine and no low power complaint but that was a hard one to figure out.

The filters are in the pump. However I have rarely seen a pump last long enough to need the filter changed. LOL. Ill see if i can attach a service bulletin about it. MTPI 258-008PB.pdf

If your truck has an EGR valve toward the rear of the exhaust manifold, it could be that opening or closing. Also if the has a turbo with an actuator on it , that could be normal. as long as its not leaking exhaust anywhere, its probably good. being an export model from the US i dont know what kind of emission system would be on the truck/engine.

Your truck might fall into this range of bad clusters. dash drop out.pdf

You can get a custome parts book by serial # for $395 or a CD for up 20 different trucks (the way I understand) for $295. You can order it on the Mack website in the E-media section,