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Porch Pup
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About Brandt

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    Old Iron Expert

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  • Location
    NW WY

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  • Model
    RD 690 S
  • Year
  • Other Trucks
    99 Western Star 4964

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  1. 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. What weight do I need in each?? What is the capacity of each? It looks like the trans has 2 drain plugs - is that correct?
  2. 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.
  3. It is stuck on there good. It's gonna take lots of Kroil and some heat.
  4. 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
  5. 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 injectors, but after the new injectors the problem remains. The other problem is that in a long pull while loaded, I hear pops and sputterings from the exhaust. I also watch the boost go from 25 to 18, to 23 to 20 and bounce around synchronized with the pops and sputtering. I have done nothing to the fuel pump. I even hesitate writing this because the truck is due for a fuel filter change and it might just be filters. If it is not filters - Am I over fueling it?? Under fueling it?? I have driven electronic engines 98% of my life - what does a fuel pressure gauge tell me and do I need one?? Because I am kinda ignorant on mechanical engines - yesterday I was tooling around at 62K on the flats at low rpm (1000-1300). Does this over heat the pistons?? Cause pistons to crack?? Anything bad? I was pulling 15 psi boost and 800* exhaust temp. My load point and dump point were about 4 miles apart , I wasn't on the throttle very hard as most of it was on a dirt road and there was no traffic that I was holding up. I don't think I made it into top gear all day.
  6. Seems the 315/80/22.5 are the same size as the 12Rs. Good to know info.
  7. 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 the old shop info, it is Antrim Diesel in western PA.
  8. 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
  9. 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???
  10. 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.
  11. What is the difference when an axle is called a "pusher" or a "tag". I'm wanting to put one in FRONT of my drive axles. I need steerable and a drop axle to clear the drive shaft.
  12. You have every right to choose not to own/carry a gun. However living in America, you will reap the rewards of those who do choose to own/carry them.
  13. Amazing how we say this is "federal" land. It is NOT federal land, it is PUBLIC land the the citizenry has tasked the feds to maintain. Until we stop saying that it is federal land (when it is actually the tax payer's land) we can expect a power grab by the feds every time!!
  14. I have the PDLO switch for my CRD92/93 axles. I was wanting a left to right lock, but it looks like I'd have to get a set of cut-offs.
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