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  1. H

    1989 S1600 x Uhaul truck 7.3 IDI Fuel Mileage

    I have one of these, an old UHaul truck with a 25 foot box. I'm getting around 10 MPG running 65 MPH on the flat with a few hills that do not pull down below 55 MPH. Manual 5-speed tranny and carrying light to no load. Just curious about what others may be getting with a similar setup. Don't...
  2. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Sorry Bart. That's about the oil pressure I run. I shouldn't have even brought the brakes into the mix. I was already told way back where I bought the truck it was probably just a dirty senor. So down the line I'll just buy an electronic gauge and sensor and mount it on top of the dash. Truck...
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    1989 S1600 x Uhaul truck 7.3 IDI

    Just checked. Sticker gone. I've had it 11 years and the 10 years before that it was a UHaul service truck that carried batteries, tires, and you name it. So stickers didn't have to be maintained for the public I'd think. But now I'll be checking when I get in just to be sure. (before all the...
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    1989 S1600 x Uhaul truck 7.3 IDI

    I had thought (from somewhere?) that the mechanical International pump put out 4 PSI. There's that memory thing again. Edit: Found this.... https://www.oilburners.net/threads/7-3-idi-fuel-pressure.41363/
  5. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Didn't know that. But when I bump it accidentally when working on stuff even with the key off something does come on that sounds like a motor.
  6. H

    1989 S1600 x Uhaul truck 7.3 IDI

    I'm at a little over 5k elevation at the present. I've had it up to 9k and yep, that required at least one more gear down.
  7. H

    1989 S1600 x Uhaul truck 7.3 IDI

    A normal truck. Ahhh....that sounds so good! Sounds like time to leave it alone. Runs and sounds really good to me. One more thing I'd like to know and it may only apply to Uhauls. It has electric over oil over brake fluid or whatever. It's electric but has an oil pressure light. Brakes are...
  8. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Good idea, but that's all checked out. No problems there. But since the post just made, I've been thinking.......... No black smoke except the last 10% or so of the throttle. I could back off a hair, even going uphill, and the black smoke would go away without losing any appreciable power. I...
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    1989 S1600 x Uhaul truck 7.3 IDI

    UPDATE........... Turned the timing up around 1 3/4 dimes. Started much better, idled much better, about 1/2 the white smoke but much better. Turned it up a hair over 3 dimes, about 4mm. Around 6 degrees. Started even better, idled even better, and no white smoke. After 30 minutes the only...
  10. H

    1989 S1600 x Uhaul truck 7.3 IDI

    That's called a FunMover. That's what mine was for 11 years traveling 7 Western states with dirt bikes in the back and an F-150 towed. Not too fast in the mountains!
  11. H

    1989 S1600 x Uhaul truck 7.3 IDI

    ATF better than Seafoam? BTW, the rebuilder is not a favorite on OilBurners. The barrel in mine had a groove cut in it and they sourced an entirely different IP. Charged $100 extra as my model was hard to find. Said just bolt it on it'd be fine. Not.
  12. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Thanks! I'm throwing out the possible injector problem for now. Took the truck on an 80 mile errand yesterday that brought the temps up a bit now running from 150 to 160. Thing is, the low 99F injector was up in the mid-range between 150 and 160. Lots of black smoke under way so I'll go back to...
  13. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Ok. I just fired her and let it idle until close to operating temperature or there abouts. Checking the block temperature at each exhaust location, the temps were running between 123 and 133F except one was at 99F. Question: Assuming compression, valves and all are about the same, is that 99F...
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    1989 S1600 x Uhaul truck 7.3 IDI

    Thanks. I'm still wiping egg. I've decided the path forward is: 1.Check exhaust port temps. 2. Then hopefully get the timing properly set. There is a guy not far from me that has been working on semi's, road graders, backhoes, you name it for several years. He will be my best bet. I'll update...
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    1989 S1600 x Uhaul truck 7.3 IDI

    I read an article by what seemed to be an experienced mechanic that said by ear even he could not get closer than 2 degrees. And I understand the forces on the rod bearings when the explosion takes place before its far enough off TDC to absorb more of the blow or force.
  16. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Thinking.....it is sounding like no matter what, I should go to someone that has the proper equipment and get the engine properly timed. All I did with the installation was to line up the marks on the block and IP. The gear was left in the engine and not disturbed prior to the replaced IP. But...
  17. H

    1989 S1600 x Uhaul truck 7.3 IDI

    Oh man! Now I'm really ticked! (at myself) I've always relied on my excellent memory but at 80 YO it appears to be fading a bit. I just went out to the truck to end this debate once and for all. I backed off the top nut on the stud as far as it would go along with the washer to take a picture...
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    1989 S1600 x Uhaul truck 7.3 IDI

    Ok. Yep, those bolts were for the gear. It's been 3 years. I remember now I had to special order a 12 point socket that size as normally available are all 6 point. And yes, that top "nut" that can't be removed without sliding the IP back a bit is on a stud. Don't remember but makes sense that...
  19. H

    1989 S1600 x Uhaul truck 7.3 IDI

    It's been around 2 1/2 years since I replaced the pump and it's been mostly sitting since. Have been planning to attack the smoke problem but things got in the way. When I did replace the IP, I was working off a really great post, a sticky I think, that gave a step by step guide, including the...
  20. H

    1989 S1600 x Uhaul truck 7.3 IDI

    The Ford 7.3 is based on the International 7.3, not the other way around. Ford purchased the use of International Patents on their engine but did change a few things. I did not "have" the rebuilt IP installed. I did it myself. There were only round holes for the mounting bolts in the IP and in...
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    1989 S1600 x Uhaul truck 7.3 IDI

    Deal is, this is an actual International engine, not a Ford. Ford changed a few things such as being able to rotate the IP with the 3 bolts loosened. Can't do that on an International. There is absolutely no rotational play once the three bolts are in place. None. I did read how to change the...
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    1989 S1600 x Uhaul truck 7.3 IDI

    I replaced the IP with a rebuilt unit. It smokes white exhaust excessively on startup but mostly clears a few miles down the road. When driving slow, like in town, and then depressing the accelerator it does pour out more black smoke that it did before the replacement. This leads me to think the...
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    1989 7.3 IDI International/Navistar exhaust smoke analysis

    Thanks. Didn't get notified of replies. I'll check my settings. Anyhow, this was not a problem prior to the rebuilt IP from Pensacola. The old IP had been good but I let it set with air and it drew moisture. So the problem seems to be with the settings of the rebuilt IP. So I'm wondering if...
  24. H

    1989 7.3 IDI International/Navistar exhaust smoke analysis

    Recently installed a rebuilt injector pump. This was the first real drive since. Driving along in 5th gear with partial throttle at about 45 MPH the exhaust blows black with slight acceleration and then white with slight deceleration. Is the white smoke unburned fuel...maybe? Is the setting...
  25. H

    7.3 idi F350 overheats while pulling

    Based on my experience.....may or may not apply. Bought an International U-Haul with an 89 7.3 idi. Same deal. Temp was fine running on flat at 60 mph all day. Pull a long steep hill and she'd over heat. Bottom line, $450 for a new International fan clutch and all was solved. Was not possible...

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