Mackpro

On most all Macks (except the 2010+) when both lights are on it's low coolant (or bad low coolant sensor)

How hot is it getting? Heres some info on the oil temp, this came out due to the complaints on the oil temp guages in the new style CX dash. sb210031 oil temp.pdf

We got the new tools last week but havent used them yet. We havent replaced any cups in a while, knock on wood!

Yes on the broke rings and your not yelling loud enough. Contact corprate offices. They should get you in touch with the dealers DSM ( district service manager), he can make things happen.

Make sure that behind the dash cluster, that the factory pugged in the correct wire according to what type of truck it is. We found lots there were incorrect and were burning up hood harness.

If you ever had to deal with Meritor warranty from a dealer standpoint, you would wish they never existed. The only time in my life where I made time to sit down and write a nasty letter to a corporation. That was about 8 years ago and I still hate them and things had not gotten much better. When my friends or close customers are specing a new truck I always make sure to steer them away from any Meritor items. May a thousand internet curses be upon them!

We get alot of new broke down MRU's towed to our shop. They are usually being delivered to the customer from the bed companies. I have seen a couple of MRU's with what looked like HD headlights. Never really paid enough attention to check them out. We also had a new GU rawhide show truck , on its way to a big show and it had some weird blue bulbs in it. However I have never seen a CHU with any aftermarket lighting.

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