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c-mac

Porch Pup
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    80
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About c-mac

  • Rank
    Old Iron Expert

Profile Information

  • Location
    louisiana
  • Interests
    many

Previous Fields

  • Make
    mack
  • Model
    chu
  • Year
    2007
  • Other Trucks
    none

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  1. Yes it has a/c the new fan clutch is on at all times with the harness to the clutch disconnected. I’d really like to see the diagram if it shows wire number and numerical pin placement
  2. clamp off the heater hoses and see if that helps
  3. Wondering if someone could post a diagram for the fan clutch? It looks like at some point a belt broke and tore the connector off the engine harness. I guess the clutch finally got tired of staying engaged at all times. I’ve replaced the clutch, now thinking I can hard wire the new clutch or try and obtain a new connector but the wires are all the same color with numbers on them. The boss don’t want to by a harness for one connector. Thanks
  4. Had one doing this before but I can’t remember what the problem was. I’ve reprogrammed with the latest software. It will not get over 360deg on regen and never starts dosing. The engine sounds like it’s going into fuel cut or missing. Checked all exhaust temp sensors, VGT function and I believe the EGR is working properly. Fuel pressure is good. The status read purging air the whole time. I haven’t checked but maybe the doing module is spraying a butt load of air into the exhaust? It won’t set any DTC’s . It runs fine though. It has the turbo bypass but non functional when regening.
  5. Will do. I've had many clear out after a parked regen. Maybe this particular one's software won't allow it.
  6. I have a 2012 chu613 with an MP8. I have a fleet ranging from 08 to 14. I'm working on one with a spn 4094-1 dtc and the guard dog states evaluating def quality 5mph derate temporarily off continue driving or something like that. It has new nox sensors, dosing module, nozzle and air regulator back by the air drier. I've cleaned and tested def dosing unit and replaced def filter. On tech tool when choosing what system I have while going to regeneration screen it asks mp8 us 10 and mp8 without turbo bypass. I've tried both settings and can't get the dtc to go inactive. It seems that the temps are getting to normal range on both. But on mp8 us10 it shows turbo bypass and the green light never comes on. What I'm unsure about is, I have some with the dosing module on the left side of the engine with and without the bypass valve. I'm not sure if the bypass is suppose to activate on this one or maybe needs a software update.
  7. pretty sure it did, its been on the road for a month. I also put new orings one the injectors
  8. The latest design cup installer pushes a teardrop shaped piece down through the cup tip and then pulls it back through. I've never seen a puller like that.
  9. Mack calls it an “overflow “ valve
  10. I'm pretty sure its fuel anyway. I found it while replacing the oil cooler cover, coolant was pouring out the bottom at the front of the engine. It already had the updated cover with metal gasket. I noticed after removing the cover the rectangular rubber gasket where the cover butts up to the rear of the water pump housing was torn and swollen. At that point I pulled the thermostat and the rubber gasket was gone. Anyway I replaced all of the coolant oring seals, they all fit loose and some looked like a rat had been chewing on them. Now I'm replacing the cups and Injector orings. The engine ran fine and the injectors look real clean. I really don't see any bad orings on the cups or injectors. The injectors have two orings on them so assume that are original. I guess I should go back with just the one oring on the injectors like the new ones come. I anyone has anything to add or anything else I haven't considered please chime in. Thanks
  11. If the regen switch is in the inhibit (down) position it will derate the engine also.
  12. Thanks for the pic's. really useful. fuel pressure is good btw. I guess I need to make a clear hose to attach where overflow valve goes down to the filter housing.
  13. When the engine runs fine with no load but starts fluttering at 1250 rpm loaded I usually replace cups and injectors. Just wondering if I could get away with just installing cups.
  14. Got the ground problem fixed T1 at 275 or so
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