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JoeH

Pedigreed Bulldog
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JoeH last won the day on November 15 2019

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About JoeH

  • Rank
    BMT Certified Know-It-All!

Profile Information

  • Interests
    Mack trucks. Concrete.

Previous Fields

  • Make
    Mack
  • Model
    R686ST
  • Year
    1979
  • Other Trucks
    1995 RD688S

Recent Profile Visitors

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  1. I suspect it might, the R model has been used with engines from the same era as the B as well as the E7. Chassis Mount Charge Air Cooler might not fit though. Perhaps the R model firewall was altered for the E7, but I'm not sure. It's only a 1 liter displacement change.
  2. My 283 whistles from the turbo, but I'm not sure the tip turbine makes any noise. Tip turbine is basically powered by wastegated turbo pressure. What conditions cause the air hiss? Under full load? Partial load? Certain rpms?
  3. The endt676 also hit its power band around 1000-1200 rpms depending on which fuel pump you had. It makes 90%+ power from 1000-1200 all the way to the governor at 2100. Going from that to an engine that never really felt like it kicked into any sort of a power and was an adjustment.
  4. I went from ENDT676 motors with 2 stick transmissions to an e7-350 with an 8LL about 6 years ago. Took me a couple years to realize everything was just fine on the e7, it's just a different motor with different pulling characteristics. It moves, but it certainly doesn't have the same feel as our old 1979 R model. Don't know what you were used to before this truck. How much pressure is your turbo generating? The E7s are also a lower rpm motor. My ENDT676 motors you wind up to 2100+ before shifting, but the E7 usually gets shifted between 1700-1800 rpms.
  5. It would suck to have to jack the truck up higher to get the trans out when you already have the engine resting on blocks.
  6. Are you having problems with boost? If the truck is making power all the way to the governed rpm and can hold full power there then you're probably just fine as is.
  7. Judging by those tires in the picture I think he's got that covered already!
  8. Been a while since I've looked at cone type axle caps, I think the end is either pressed or welded in. The ends don't do much work.
  9. My 88 RD690S front spring hangers are taller than my 1995 RD688S. '88 has 20k front with 4 leaves, 44k rears & lift axle. 95 has 18k front with 16 leaves, 44k rears & lift axle. Different front tires, but the '88 sits roughly 6 inches taller at the front.
  10. If they're coming loose then they're not tight enough. You could replace the studs and nuts.
  11. How come you didn't make delete panels for the rest of us?
  12. Could be the stock motor, they made many 1998 trucks in 1997 so they'd be ready to sell January 1st! (Or sooner) Vin tag should tell the build date.
  13. Edit: 3/4" steel per side, so 1.5" of frame thickness left and right. Not sure which "big piece" you're talking about, the solid beam instead of springs?
  14. This truck has 55k springs on 58k rears. The "Eagle" is a third inner rail that functions as a gusset to stiffen the trunnion. It's a double frame truck, with two 3/8" rails for a total of 3/4 steel, excluding the Eagle. Also note that the trunnion stands bolt to the outside of the rails.
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