Mackpro

The only way Mack could survive without Volvo now would to use Cummins and /or Detroit engines, Mack or vendor trans and of course Mack or vendor rear axles. If someone could buy Mack from Volvo , ditch the MP engines and be like Peterbuilt and Kenworth. Mack would have an advantage over Pete and KW with having their own transmissions and axles. I feel Freightliner and International are not a threat to Mack, at least in our area. KW and Pete are our biggest competitors around here, they cant even give Volvo dump trucks away around here, dont know why Volvo even bothers building them. With all that said, our MP engines are getting very close to having all the bugs worked out and looks like it will be a great engine soon. Just saw a bulletin from Mack that says the MP8 with SCR can be bumped to 555 HP and over 2000 FT LBS of torque, but only in the Titan. I assume by useing the larger MP10 radiator in the Titan they can do this. We have sold 2 MP8 505HP and they guys love them, says its hard to tell when the trailer is loaded or not. I dont see Volvo selling Mack anytime soon though.

As FJH stated you probably busted a cermaic cam lifter, sadly it happens alot. When ever we have a ASET apart we put the newer style hold down bolts in. I dont remember the pre ASET (2003 and older) engines breaking but anything is possible.

AI engines need to be speced almost perfect to get good perfromance. We have had bad combos like 8LL fuller trans, 4.17 gears and tall 24.5 tires. Finally had to change the rear gears to 4.64 to get it up and going. Tourque curve on an AI is screwy.

I hope he has 4.42 or 4.64 or he's in trouble from the start.

We still see alot of problems with the boost pressure relief valve, the screw on end cap on the newest style/part# seems to screw itself out and cause low boost. We screw in the end cap as far as we can and hammer/ping over the end to keep it from happening again.

Dont feel bad, I waited 3 weeks for some rod bearing for an MP-7 engine. Now have a 2011 GU with a bad dash display and Mack cant say when we will ever get one.

We have lots of CV dump trucks around here. With the AI engine the usual average MPG is 5.2 so your not off by much.

These were plain ETECH engines around 2000-2001. Trying to think if I have seen it on any ASET AC engines. Gearing and tire size is the only the thing I have seen help with power for the AC enines. Bigen (CHN AC ASET) said after we installed a coolant shutoff on his fuel heater for the summer his MPG and power went up?

I have seen improvements in power on certain CX style trucks that had the muffler underneath the cab/sleeper. That style muffler seemed very restrictive. A straiht pipe was put in place of the muffler. The truck wasn't to noisy but the dual exhaust was behind the 60" sleeper and had tall pipes. A friend has a 2004 CV dump truck with a AI-427 and had all custome exhaust from turbo to exhaust tips. He had squeezed 5" pipe starting at the turbo ( hard to do in a CV, you now have to remove the turbo pipe to get at the #5 and #6 EUP) all the way to a 6" TEE then 6" dual straight pipes in place of the mufflers. It did run better but you couldn't listen to the raido or cell phone while goin down the road. After about 6 months he replaced the straiht pipes with mufflers but left the larger turbo pipe and Tee and said it still ran better than stock.

What year and model? Mack made the 427 from around 91/92 till 2007. Startin with the E-7 VMAC-I , VMAC-II, ETECH, CCRS, ASET AI and AC. Now the closest thin is the MP-8 425. All had good points and bad with some worse.

I was looking at a brand new 2011 CXU and GU on our lot and neither one had the air clutch assist on them. Guess the boss man ordered them without. Smart move.

Change that filter ASAP as its does a better job at filtering than the 2 spin-on filters do. Its the best thing they put on a Mack engine.

Saw this on an old CH I was working on today.

It's a whole lot better to have oil running out of the engine ECM than antifreeze. The ASET's sometimes have the low coolant sensor leak antifreeze into the harness and it will make its way to the engine ECM and rot out the pins in the ECM. The MP engines usually have the oil level/temp sensor leak oil into the harness and usually not hurt anything but make a mess(sometimes cause weird codes to appear). So as long as it's just oil were are OK. Oil pressure or oil temp sensor is probably pushing the oil into the harness, we will get it figured out.

I'll make sure I have a switch and go ahead and try a new cap, just make sure it's a 16 pound cap. This cooler weather is causing lot of cold water leaks.

If you have a truck down with the bad cups, get the new style stainless steel cups and new style injectors. We have put several sets in. However today I had to pull a stainless cup out and replace it. The new cup didnt fail but the injector hold down bolt broke and the injector jumped around and damaged the cup.

We got the thermostat kit for $101. Yours is probably orignal and they were prone to leaking, as Rasler said these new style have a better o-ring for sealing.

You do have a Wabco compresssor and a Bendix AD9 air dryer on your truck. The Wabco compressors did have problems with their valves getting gummed up with carbon/sludge but this usually caused the compressor not to build up air or build up slowly. We had alot of Pilgiram Pride chicken trucks have this problem and had to replace the compressor head with a new updated head. Although I never remember it affecting the air dryer operation.

It does it have a MP engine? If so, it might be low fuel pressure due to blown injector cups. There is finally a fix for this as we have been putting in the new stainless steel cup's and new style injectors. Is the truck model a CV713 or a GU713?

Call Rochester Fuel they list performance CCRS injectors which are the same injector body as the AI injectors. I have talked to them before and they were very kowledgeable. http://www.rochesterfuel.com/products/etech-ccrs-stage-performance-injectorexchange-p-200.html

Thats what our DSM is also saying. The only problem I'm hearing is the DEF pump but Mack already has thoses in Reman.