Mackpro

On the poor throttle responce between gears, have you had the dealer do the "Step 12B" update to calibrate the throttle pedal? It seems to do wonders on some trucks. Just did one on a CXN this morning. Took me about 2 hr to reflash and download both ECM's. But with just a AMI-300 engine its just not much to work with. You could jump to a AMI-335 with just a download( HP upgrade) and it would give you 140 more FT LBS of torque. I dont know how much the download would cost as it has to be turned on at Mack and installed by the dealer. Also if these are MR or LE garbage trucks your limited to HP because of lack of radiator cooling.

All AI and AMI engines seem to have high soot in the oil, mainly due to the design of the engine. The AI/AMI has 2 humps on the exhaust lobe of the camshaft and opens the exhaust valve twice. It will suck dirty exhaust out of the exhaust manifold (anyone notice how small the exhaust manifold is on a AI) and reburns it on the next stroke. Kinda like a EGR system. Thats how the AI/AMI got away with no EGR valve/cooler but the AC engine didnt. Also there are 3 or 4 ways of oil sampling. I know that the one the local CAT dealer uses always shows super high soot in the AI/AMI engines. oil sample.pdf

He just said "dont do it , unless you like buying an engine". I really dont believe him, but I really dont want to find out that he's right!

The 10W30 was factory fill for most 2010 + Mack MP engines, it was done for MPG reasons. But we were told if you ever changed to 15W40 , dont go back to 10W30. This was coming from a Mack engine guy at Hagerstown. Here is the Mack service bulletin on the oil pressure issue. PV729 -FSB221-010_M.pdf

Been so busy here that I rarely open my laptop when I get home so I dont get on here to much anymore. It's been a couple of months since I talked to Bigen. I text him today but dont know if he has the same phone number. I picked up 2 part time jobs at night monday through thursday plus my day job plus helping with my wifes store/business. My 6 and 12 year old boys keep me and the wife busy as well. Hopeing to retire from my full time job in less than 10 years at age 55. Things are looking good and I have my fingers crossed!

Mack finally came out with a service bulletin on this problem. After I read it i remember someone on here was having this issue FSB 221-010, Diagnostic Trouble Codes (DTCs), Low.pdf

Also check this as well, remove the black metal kick panel in front of the passenger seat. On the back of the kick plate will be the ABS ECM and the vehicle ECM. Make sure the vehicle ECM is facing down ( connectors facing down). If not unplug the 3 connectors and check for rotting/green pins. Also check the wiring harness for rubbing on the kick panel. We had alot of RD ETECH's with the ECM's facing up and full of water.

And also this. ASET thermostats.pdf

Here are some things to check over. oil cooler inlet screen.pdf Coolant push 1.pdf coolant push 2.pdf coolant push 3.pdf

If you could find a RD with a Horton air fan already installed you could get the VIN and take the # to your dealer and they could figure out what parts needed. . Also remember to take the truck to the dealer to get the "smart fan" and "air conditioning installed" enabled in the engine ECM datafile.Also check the AC high pressure line coming off the drier to the condensor, for a fan/high pressure port and you will need to add a high pressure switch so when the AC head pressure hits 300psi the fan kicks on.

3 pounds is the usual.

The worst truck we ever sold was a new CV with a AI 400, Fuller 8LL trans, 4.17 gears and tall 24.5 tires. We almost had to buy it back. if your gonna run tall rubber with a AI engine , you better have atleast 4.42 gears. 4.64 gears pull good but limit your top speed and burn alittle to much fuel. Mack paid for a few rear gear changes here at our shop due to unhappy customers back in the early AI days. My good friend has a 05 CV tri-axle with a 427 AI with a 8LL, 4.42 gears and tall 24.5 tires and his is about right. It will do 79-80 MPH and pull good. We have done all the software updates+ a special Austraila engine file. Our next step on his truck is a full 5" exhaust with a high flow muffler. I think his turbo is about to go out so were ready with a 460 turbo and 460 HP download. We are also going to try a fuel cooler before summer hits.

If any body is wants the Horton change over to air fan. fan clutch.pdf

Does it look like oil mist/leak on the front of the engine? These fan clutches leak oil and it blows on the front of the engine. There might not be a drop of oil on the fan clutch its self but the front of the head or valvecover will have a mist on oil on it. Then again sometimes they dont leak. The newest version/part# seem to be lasting alittle longer.

If its the Borg Warner Cool Logic fan its junk. We have a pile of bad ones here and warranty doesnt even ask for them back. I have put 2 on my friends 2012 CHU. Horton makes a kit to swap it over to one of their air fan clutches.

Are you looking for the "serial link A" or "B"? These wires/connections are usually used for trip recorders or driver log type things that monitor road speed.

All ASET engines ( AI and AC models) that have the Powerleash engine brake need to have the rocker arm hold down bolts cheecked or replaced. We have seen many come in with broken bolts, broken rocker arm shafts and at worse needing a cam job due to a shattered roller rocker. Please check the part # on the bolt heads! I have seen broken bolts lead to broken rockerarm shafts which can cause oil pressure to get into the powerleash oil passage causing the engine brake to engage randomly going down the road. rockerarm bolts.pdf rockerarm shaft.pdf

Here some info I found on dash issuses with your year model truck. sb732005 dash.pdf

We have never had to remove a filter and have it cleaned on the CXU/CHU/GU models. We have some CXU's with 700,000 miles on the orignal filter. We had a few turbos go out and pump oil into them and we replaced them. Had a few EGR valve stick open and "face plug" the cat filter and we just blow it off with a blow gun ( while wearing a mask). Gotta be something else wrong going on.

Yes , the exhaust manifold gaskets and studs are know to blow and break quiet often. Here is the new SB on the newest style parts. The center studs are now longer with spacers. It seems to help. SB214047.pdf

Heres the SB sb261012.pdf

Caused by running a dirty air filter or restriction. It sucks oil past the rings of the air compressor. We see it all the time.

Our customers new Titan 605 with 5000 miles on just got its first test. 157000 pounds with cruise set at 65mph, topped the largest long hill around here without down shifting and lost just 5 mph. Their new Cat truck now just sits collecting dust.

Boost pressure relief valve on top of intake maifold. a large brass valve/nipple that screws in to manifold and the turns to a rubber hose then into metal pipe that goes over the rear valve cover into the turbo exhaust pipe. They go bad alot. Has the boost pressure sensor been changed lately? There are 2 different part #s , if the wrong one is installed it will have low boost. Also turbo actuator sticking or to air to actuator, but should set a active code.

I guess I come here when I need a laugh. But I know it's the same thing over and over. Im not overly thrilled with Volvo but I tried to scrape my pennies together to buy Mack but came up short. However I have plenty of MP's to work on and they get easier to figure out as time goes by and it pays very well. I could whine and bitch over stuff thats out of my control but why? Seems like lots of sandy vaginas around here anymore.