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Mackpro

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Posts posted by Mackpro

  1.   On 11/25/2022 at 2:48 AM, mechohaulic said:

    basically your saying they used the "emergency" blow off valve to regulate pressure? i've heard trucks that constantly had the discharge blowing off, thought it was malfunctioning governor. interesting 

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    It was a weird set up compared to domestic trucks. The only downside is that the air compressor ran all the time. I guess it’s the European way of doing things. I still have lots of Midliner service manuals at work. 

  2. From what I remember from working on Midliners at the dealership in the late 80’s and into the 90’s was that the air compressor on most Midliners pumped all the time . They had a pop off valve down by the air tanks that would open at a set tank pressure and close when pressure dropped to a certain PSI. I remember it was a pain to install a air drier. I’ll see if I can find some info on it. 

  3. I believe there was a service bulletin on replacing the complete tandem pump assembly when there was leakage at the tandem pump weep hole. I replaced one on an older MP with 800,000+ miles on it . Where the fuel pump bolted to the powers steering pump was chewed up inside where they connected. It was one of the few times where I pulled the injectors on a hard starting complaint and it wasn’t a  cups  issue. 

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  4. The 04 emission MP7 in the CTP/CXP has copper injector cups and  there is no upgrade to the stainless cups and updated injectors for this engine. However there are upgrades to the injector hold down yoke and bolts. There service bulletins out there for the parts and procedures 

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  5. Using the stalk switch on the right side of the steering column. Go through the display screen till you see “Trip Info “.  Enter into the Trip Info and you will see Trip1 and Trip2 and engine hours. Go into Engine Hours . If all you see is dashes then the Engine ECM is not  powering up . Possibly bad engine ecm or low voltage/bad ground to the engine ecm . 

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  6. The braded line that run from the expansion tank to the top of the top radiator pipe has been know you collapse inside . Take the line loose at the radiator hose and see if you can add more coolant. Sometimes the elbow fitting on the expansion tank is actually a check valve with a ball in it. This can get stuck and cause issues. There were many variations of expansion tanks and piping and fittings over the years and service bulletins for upgrades that could be done . 

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  7.   On 11/7/2022 at 6:40 PM, Rsc1717 said:

    One more thing I noticed ,

    For  some reason exhaust temp not rising during regen . Seems like regen never ended or couldn’t get thru . Can cups cause problems with regens . 

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    Usually we get over temp on the T2 temp sensor and the regen kicks out when the injector cups are leaking . However , going over some old notes , yes , the cups can cause all sorts of regen issues. 

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  8.   On 11/1/2022 at 4:38 PM, Joey Mack said:

    The brake light pressure switch on an RD, is on the fire wall under the hood.. in the center..  Beware, it is hot all the time regardless of ignition position..  Jojo

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    I always found it weird that they hid the brake light switch on the outside on the RD’s with an ETECH engine. I can’t remember If the earlier RD’s were like that as well. 

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