refusegetter Posted January 10, 2013 Share Posted January 10, 2013 2013 MRU613, roughly 6000 miles mp7 Allison auto front load garbage truck. The problem is the air filter is filthy, like crazy filthy looks like soot. Anybody ever see or hear of a problem like this. Also notices the screen for the the intake is plastic mesh and has gotten hot enough to shrink. Quote Link to comment Share on other sites More sharing options...
refusegetter Posted January 10, 2013 Author Share Posted January 10, 2013 Commenting for "recent topic" exposure lol Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted January 10, 2013 Share Posted January 10, 2013 Going out on a limb but is it sucking in exhaust? Quote Link to comment Share on other sites More sharing options...
refusegetter Posted January 10, 2013 Author Share Posted January 10, 2013 Lol why? Is this common? I'm pretty sure it wasn't designed to do that Quote Link to comment Share on other sites More sharing options...
refusegetter Posted January 10, 2013 Author Share Posted January 10, 2013 Ballard wants the old filter and the truck to stop there tomorrow, well see what they say. Quote Link to comment Share on other sites More sharing options...
e9500v8 Posted January 10, 2013 Share Posted January 10, 2013 Looks like it was ran backwards!! I know the old ones would do that but don't know about the new electronic ones ? Quote Link to comment Share on other sites More sharing options...
41chevy Posted January 10, 2013 Share Posted January 10, 2013 Sure looks like like it ran reversed Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
refusegetter Posted January 11, 2013 Author Share Posted January 11, 2013 Ya but how does that happen? Does it change back? It runs fine, no dash lights or anything. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted January 11, 2013 Share Posted January 11, 2013 Looks like the cab guard is causing the exhaust to get trapped and recirculate into the intake, probably while you are stopped loading or unloading, I would remove the stack top and replace it with a 90 degree elbow and pipe to vent it to the outside. I know the trucks here are set up that way for that reason, the stack top on your truck is actually not made for enclosed areas it is made to disperse the high heat exhaust gas in a wide area so it cools faster, it works great when its out in the open but not so much trapped under there it again disperses the gas in a wide area so in that configuration it will get pulled right into the air intake. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
refusegetter Posted January 11, 2013 Author Share Posted January 11, 2013 Thought about the body causing some sort of flow restriction or rerouting the exhaust. It not like this is the first front loader made so I kinda figured any problems like that would have been sorted out. When the truck regens the exhaust temp is hot hot enough to prob melt paint or cause some other problem. Also the cab guard has a cut out above the stack. The truck runs a tight route in town daily and runs to the landfill(40 miles one way) on the highway. Quote Link to comment Share on other sites More sharing options...
staxx Posted January 11, 2013 Share Posted January 11, 2013 When it regins that pipe is 1800-2000 degress and it will melt plastic need to turn or extend and turn pipe away from intake its cooking your air filter. Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted January 11, 2013 Share Posted January 11, 2013 Ok so we all agree. If you ever had your hand near that intake when the engine was running at hi idle you would feel the suction. Just imagine what it's sucking when the turbo is going to Work.! Quote Link to comment Share on other sites More sharing options...
farmer52 Posted January 11, 2013 Share Posted January 11, 2013 It is a 2013 model with a DPF. Very little if any soot should be exiting the exhaust pipe. No soot should be passing thru the DPF even druing regen. My guess is the DPF filter is cracked or defective and it is sucking in soot. Is the filter covered with soot or black from getting too hot? Let us know what the dealer finds. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
rsb502 Posted January 11, 2013 Share Posted January 11, 2013 Yeah the exhaust cutout is there for a vertical pipe cut that thing a few inches under the diffuser and add enough pipe to get it up in clean air. Just having a cutout doesn't do much if the pipe is a foot under it and exits thru he side not the top, your cooking your air filter and the high intake temps are gonna kill your engine before too long. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
refusegetter Posted January 11, 2013 Author Share Posted January 11, 2013 Ballard seems to think its from a sitting regen, but the only time it ever sat during regen was there one time. They took pics and are going to talk to "the factory" also, another hauler has the same truck/body configuration and doesn't have a problem...I think I'm gonna take it in the shop and try to locate the dpf filter as mentioned above. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted January 11, 2013 Share Posted January 11, 2013 the dpf filter is the muffler one section is the particulate filter the other is the catalyst and then you have the scr chamber, if you remove the stack top with the diffuser on it and put a pipe on it that goes up to thje cutout in your cab guard youll fix the issue, but hey its a whole $40 bucks for a stick of pipe to try it and see if it works or not. go look at the other trucks exhaust configuration see if the stack is the same length or has a different tip, I would extend the stack to get it out of the cab guard and swap the air filter and I bet the filter stays clean and your engine temp goes down too. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
refusegetter Posted January 12, 2013 Author Share Posted January 12, 2013 I will be traveling tomorrow to investigate the ther truck that Mack speaks of both to confirm the configuration and to take measurements on the stack. Thank you, though an obvious easy fix its def better to hear it from an unbiased source. Again thank you Quote Link to comment Share on other sites More sharing options...
fjh Posted January 12, 2013 Share Posted January 12, 2013 We put straights or turnouts on pretty much anything we send out ! The burner screens pile up in the corner of the wearhouse! Quote Link to comment Share on other sites More sharing options...
oilburner Posted January 12, 2013 Share Posted January 12, 2013 Looks like it was ran backwards!! I know the old ones would do that but don't know about the new electronic ones ? Yes they will, i luged my 98 e7 down the other day on a hill and it rolled backward and fired up and smoked out the hood, but it did not do it but a few sec. I had a little to much wegiht on here and was trying to let a loader operator get out of my way without stoping and haveing to pull out on a grade, i know rookie stuff right!! Quote Link to comment Share on other sites More sharing options...
Challenger Posted January 13, 2013 Share Posted January 13, 2013 All MRU's and LEU's have that same stack, there should be no reason to change it. There are 1000's of the same trucks out there running just fine with the OEM stack. You do have an unusual problem that will require a dealer service with Mack tech support. Is there any signs of soot inside the exhaust pipe or around the exhaust? I would think that if exhaust is coming form your stack it would be visiable on the white paint. There should be 0 signs of soot anywhere. Anys signs of soot means the DPF filter is cracked. Assuming there is no signs of soot around the stack they might just replace the air filter, repair/replace the air intake, let you run the truck and keep an eye on it. Quote Link to comment Share on other sites More sharing options...
staxx Posted January 13, 2013 Share Posted January 13, 2013 If its turned the wrong way it will burn everthing had a brand new mru and did a regin melted hopper lites and wiring all air hoses to air lift top lid. Quote Link to comment Share on other sites More sharing options...
refusegetter Posted January 13, 2013 Author Share Posted January 13, 2013 We do get soot visible on the white paint and the driver says when the truck regens the rear glass is hot to touch. Quote Link to comment Share on other sites More sharing options...
farmer52 Posted January 13, 2013 Share Posted January 13, 2013 We do get soot visible on the white paint and the driver says when the truck regens the rear glass is hot to touch.What you describe sounds like a cracked or defective DPF. Per earlier post, the inside of the stack should be clean...no black soot. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
Challenger Posted January 13, 2013 Share Posted January 13, 2013 What you describe sounds like a cracked or defective DPF. Per earlier post, the inside of the stack should be clean...no black soot.I second that. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted January 13, 2013 Share Posted January 13, 2013 The first MRU frontloaders we sold back in 2008 were melting the plastic worklights and anything that was not made of metal under the cab protector. The bed company usually had a hole in the cab protector for the conventional muffler pipe to come up through. They were afraid that trash would fall through the hole onto the hot DPF and catch fire. So they put a block off plate over the hole. Now the heat from the DPF when regening was trapped under the cab protector and started melting anything near by. As per Macks instructions we removed the block off plate and put a piece expanded wire over the hole to allow the heat to escape and not let trach fall ontop of the DPF. Thoses 3 trucks are still running fine today with no issuses. However with the SCR now added and the different position of the exhaust piping thing are quite different. And as everyone said it could be a cracked filter. Quote Link to comment Share on other sites More sharing options...
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