Jump to content


Porch Pup
  • Content Count

  • Joined

  • Last visited

Community Reputation

18 Good

About Brandt

  • Rank
    Old Iron Expert


  • Location
    NW WY

Profile Fields

  • Interests
    I run ND, WY, MT and ID in the Star. I run the Mack around Park County WY

Recent Profile Visitors

1623 profile views
  1. It would be nice to find one of them, except you guys put the steering wheel on the wrong side. 😁😁
  2. WOW!! Those are some low numbers. Like looking for a needle in a haystack. Guess I'll start looking for a MH with a Series 60
  3. Sputtering is still there when the engine temp is low. It seems to go away after the gauge hits 160*. Fuel issue went away after I changed the nearly 30 year old fuel lines. Seems they were collapsing under a load.
  4. I have seen some older Macks with Detroit 92/71 series engines and Cummins Big and Small Cam engines in them. Once the engines went electronic did Mack use other than Mack engines?? Did a Series 60 Detroit or N-14 Cummins ever make it into a Mack??
  5. What drives my speedo and where do I find it?? For the last year my speedo has been working when it wants too. Sometimes reading properly and sometimes showing 15mph when I'm at highway speeds. This also goofs with my odometer as I have only gone 550 miles in the last 9 months. I looked on the trans and found no cable driven port. Is it air?? Electric?? Does the cable come off of the top?? 1991 RD 690 TRTXL1070B - 12 spd w/.78 OD CRDPC92 & CRD93 diffs with SS440C axles It is due for a triple box oil change. I am going to run Amsoil in the trans and diffs.
  6. I bought a spare housing from Mack in case I crushed mine. I turned like there was no tomorrow and it loosened up and came off w/o crushing. Mack took the part back and I am $97 richer!! Thanks guys.
  7. It is stuck on there good. It's gonna take lots of Kroil and some heat.
  8. How do I get the centrifuge oil housing off to replace the element???? Last time I skipped it, but I can't do that again! EM 7 300HP Maxadyne
  9. Finally got the high flow injectors (ADSKBAL137P26HFEX) and turbo (SCH174828) in. The truck runs a bunch better!! Before, my empty mpg was 7.4 to 7.5. Now my mpg is 7.2, but that is 50% empty and 50% loaded at 62K. The most boost I saw was 27psi, but 22 psi seemed the norm. Empty I was pulling 9 psi to maintain 60 mph. EGTs ran about 800, but did spike at 1000 on a 4 mile grade. These are after the turbo readings. I still have 2 problems with it. Before it reaches operating temp, it still sputters and stamers. Once the temp gauge hits 180 it goes away. I thought this was i
  10. Seems the 315/80/22.5 are the same size as the 12Rs. Good to know info.
  11. Can I run 12Rs on an 8.25" rim or does it need a 9" rim?? The OEM injector # is 736GB343P3. I have a Turbo #, but Google turns up zero info on it. When I'm empty I run the low side of the gears until I reach the top on, then split to the high side. When loaded, I might run the low side for the first shift, then I split them all the way up. I generally shift around 16-1700, as I am conditioned to shift low due to the 1.5 mil electronic engine miles I've done. I don't know what this engine is governed at as I've never ran it up that high to find out. Found
  12. There is only 225K miles and 12K hours on this truck. It was a county plow truck and seems to have a lot of idle hours. I do have to remind myself that it is not a Series 60 and won't go for a million. The build sheet shows: EM7-300L-4VH 1425 lbs-ft TRTXL1070B - 12 spd w/.78 OD CRDPC92 & CRD93 diffs with SS440C axles I would much prefer 4.17 gears, but I don't think I'll ever recoup the cost in fuel savings. With Dayton hubs, I'm kinda stuck with 11R-22.5 tires
  13. OK, 400 is out of reach. I am not familiar with the differences between the Maxi, Econo, Thermo power curves. I can live with 350. I'm just wanting to gain as much as I "reasonably" can due to the increase in weight that I will be pulling. I have a 12 spd behind it with 4.42 gears. I think the 12 psd is a 1050TX???
  14. I have a '91 EM7 300 Maxidyne that has 2 or maybe 3 failing injectors. This was a transitional year and it is all mechanical except for the elec fuel pump. I was told that I could upgrade the injectors and turbo (at the same time) and possibly achieve 400 HP. I have lost contact with this source, but am ready to do the upgrade. Where do I find out what part numbers I need for the inj and what model turbo. The truck works at 4900'-5900' elev and I plan on adding a pup to it. Gross will be around 88-91K depending on how long my pup tongue is.
  • Create New...