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Author Topic: 2020 7.3 ford  (Read 4161 times)

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Offline mike_belben

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Re: 2020 7.3 ford
« Reply #60 on: February 10, 2019, 03:38:31 PM »
nothing i own would start at -27 and that includes me.  Thats national emergency temps, aint goin nowhere. 
Revelation 3:20

Offline starmac

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Re: 2020 7.3 ford
« Reply #61 on: February 10, 2019, 03:50:12 PM »
My 12 valve will not start below 10 below, unless it is plugged in, then 30 or even 40 below is no problem at all.

I suppose everything I own starts at 30 below with no problems as long as they are plugged in, I just hate to start plugging in the gas rigs until it is 10 below or more, it is too hard on the electric meter.
Old LT40HD, old log truck, old MM forklift, and several huskies.

Offline barbender

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Re: 2020 7.3 ford
« Reply #62 on: February 10, 2019, 03:59:55 PM »
My Cummins have always started good in the cold. I plug them in just cause it's easier on them. The intake grid heater is key, let it cycle til it kicks out, turn the key off and let it cycle again. Then hit the starter and they come to life. I was surpised how easily mine started yesterday. It seemed like it cranked hard for being plugged in, well in essence it wasn't😊 Same routine for the Ponsse machines, the Mercedes 906 has a intake grid heater system as well. My forwarder will reliably cold start down to -20, not the preferred method but sometimes the Webasto preheatedr malfunctions and you show up to a cold machine. Mike, up here if you won't go out on the -25 mornings, you won't get out much. Especially this winter, it's been a bit of a doozie. Lots of snow and cold👎
Too many irons in the fire

Offline barbender

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Re: 2020 7.3 ford
« Reply #63 on: February 10, 2019, 04:01:45 PM »
I forgot to mention, I do run 5-40 synthetic Rotella oil in my Cummins, that definitely makes a difference.
Too many irons in the fire

Offline moodnacreek

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Re: 2020 7.3 ford
« Reply #64 on: February 10, 2019, 04:23:47 PM »
Wasn't the 7.3 a gas engine to begin with?  I think it was based on the IH v8 that replaced the 304-392 for the epa rules. My '91 f350 pu has 200,000 and gets 20 mpg running lite. Only problem it's only 185 hp.

Offline snowstorm

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Re: 2020 7.3 ford
« Reply #65 on: February 10, 2019, 04:45:34 PM »
I too have no intention of ever buying a new superduty ; I will let somebody else eat that depreciation. The first step is to admit you have a problem. I have a Ford truck problem.  I own and maintain five powerstrokes .  One 6.7 , Two 6.0 s and two 7.3s .  The 2000 F550 smokes a little with 700k on it.   I am impressed with the 6.7 , but probably more impressed with the truck, quiet and smooth.  My favorite psd is the 6.0.  The 2003 F250 has the head studs and stock programming.  The 2004 Excursion 6.0 has been modified and it is nothing short of a beast and gets 20 mpg .  I found good deals on both my 6.0 s after people got diesel shock from repair cost.  I was telling a friend that had sworn off the diesel pickups how much I liked the 6.0 and he said that is because you don't have to spend 5k every time it breaks down!  
you have more than i do. i only have 4. 1 7.3 1 6.0 2 6.7. i have never plugged a 6.7 in. maybe should have. the coldest it was it was -28 it started ran a few seconds stopped started back up ran fine. since you have an older f550. have you had any trouble breaking wheel studs? 04 and older had 8 newer had 10. sometimes its on the front usually its the rear. nice to see i am not the only one that likes his 6.0

Offline starmac

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Re: 2020 7.3 ford
« Reply #66 on: February 10, 2019, 05:06:34 PM »
Wasn't the 7.3 a gas engine to begin with?  I think it was based on the IH v8 that replaced the 304-392 for the epa rules. My '91 f350 pu has 200,000 and gets 20 mpg running lite. Only problem it's only 185 hp.
It is my understanding that the 6.9 started life as a diesel, it evolved into the 7.3.
The original 5.7 chevy was built on the olds 350 block, after there life was up as a diesel (pretty quick), the circle track guys used a lot of the blocks and bottom ends to build them back gas.
Old LT40HD, old log truck, old MM forklift, and several huskies.

Offline snowstorm

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Re: 2020 7.3 ford
« Reply #67 on: February 10, 2019, 05:12:17 PM »
Wasn't the 7.3 a gas engine to begin with?  I think it was based on the IH v8 that replaced the 304-392 for the epa rules. My '91 f350 pu has 200,000 and gets 20 mpg running lite. Only problem it's only 185 hp.
that would have been the 404    446 gas that ih came out with in the late 70's? also a 537. they replaced the older gas motors. i never heard the 7.3 came from that. they used to say way back that the 1160 cat was styled after a 534 ford. the 1160 later became a 3208

Offline kiko

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Re: 2020 7.3 ford
« Reply #68 on: February 10, 2019, 05:22:13 PM »
With the 550 I have not any issues with the wheel studs on either end.  If you change the rear brake pads every 24k miles, you won't get into the rotors.  Had a 99 F450 that was the same way.  I can't give an exact count but have rebuilt the entire front end on the F550 several times , each time the wheel bearing assemblies were replaced and the came with new wheel studs.  Had several issues with the clutch and hydraulic master slave.  With the IMT box ,crane,air compressor, welder and tools , I believe the front is light.  This truck has been retired to a yard truck but is still dependable.  Took it up the road not to long ago to do a clutch job on a Trelan chipper.

Offline snowstorm

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Re: 2020 7.3 ford
« Reply #69 on: February 10, 2019, 05:59:24 PM »
i know several that run f550 plowing roads. most have a 10ft plow and a 9ft wing then add a sander and sand. mine weights 15000 with out sand. so loaded its close to 25000. and there is some side load with the wing. last week it cleaned off all 8 studs at once. by the time i got stopped one tire was laying on the ground. bolth wheels were junk after that the stud holes were now slotted. and for anyone that has the studs break never buy them from napa. buy from ford much better and use a torque wrench 165 lbs 

Offline snowstorm

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Re: 2020 7.3 ford
« Reply #70 on: February 11, 2019, 06:17:44 PM »
from what i read the 7.3 will have a variable flow oil pump. as they put it once it gets a little wear like after 3 to 400,000 it will increase oil psi to bring it back up to spec. and its not direct injected

Offline moodnacreek

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Re: 2020 7.3 ford
« Reply #71 on: February 11, 2019, 06:39:51 PM »
from what i read the 7.3 will have a variable flow oil pump. as they put it once it gets a little wear like after 3 to 400,000 it will increase oil psi to bring it back up to spec. and its not direct injected
Pre combustion; hard to find these days but I think it's better for me because most of my fuel is waste veg. oil.

Offline barbender

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Re: 2020 7.3 ford
« Reply #72 on: February 11, 2019, 07:04:47 PM »
It's a gas engine.
Too many irons in the fire

Online Dave Shepard

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Re: 2020 7.3 ford
« Reply #73 on: February 12, 2019, 12:13:53 AM »
I don't think anyone has mentioned a gas engine in about two, maybe three pages.  ;D
Wood-Mizer LT40HDD51-WR Wireless, Kubota L48, Honda Rincon 650, TJ208 G-S, and a 60"Logrite!

Offline barbender

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Re: 2020 7.3 ford
« Reply #74 on: February 12, 2019, 12:27:10 AM »
True.😂
Too many irons in the fire

Offline Riwaka

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Re: 2020 7.3 ford
« Reply #75 on: February 12, 2019, 05:10:08 AM »

Online square1

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Re: 2020 7.3 ford
« Reply #76 on: February 12, 2019, 06:28:42 AM »
Wasn't the 7.3 a gas engine to begin with?  I think it was based on the IH v8 that replaced the 304-392 for the epa rules. My '91 f350 pu has 200,000 and gets 20 mpg running lite. Only problem it's only 185 hp.
that would have been the 404    446 gas that ih came out with in the late 70's? also a 537. they replaced the older gas motors. i never heard the 7.3 came from that. they used to say way back that the 1160 cat was styled after a 534 ford. the 1160 later became a 3208
Because the 6.9, and later 7.3, shared many bolt on components with the 404-446 gasser to capitolize on an established replacement parts supply many believe it was a converted gasser..  Inside,  it's a diesel, having oil spray cooling on the piston skirts, etc... The bare 6.9 / 7.3 block weighs several hundred pounds more than the gassers.

Offline moodnacreek

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Re: 2020 7.3 ford
« Reply #77 on: February 12, 2019, 09:02:19 AM »
Square 1, thanks for that post.

Offline mike_belben

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Re: 2020 7.3 ford
« Reply #78 on: February 12, 2019, 09:28:58 AM »
The 7.3 idi was born from the 6.9idi block by overboring it due to low power complaints.  The original casting was sufficient for 6.9 but not 7.3 so thats where the cavitation issues come from, too little cylinder wall.  Over time and billions of cycles, the pressure waves in the coolant cavity lap the shores of the cylinder wall backsides and this water against metal action erodes from the water jacket until a pin hole breaks into the liner and leaks.  I suppose sleeving is an option but overboring early 7.3 is certainly risky business.  SCA coolant additives may as well have been invented for the 7.3 idi. Itsna plastic coating so that the erosion eats the coating instead of metal. Just dont let it run out. 

Another issue was the 6.9 had a loose valve seal that consumed a lot of oil and carboned up the back of the valves so they went much tighter on the 7.3 version but erred on the too tight side so valves were prone to starve of oil, wear the guide and stem, in extreme cases break the valve face off and drop it into the hole.  I think itsna wives tale that they wore the stems that thin.  It doesnt take much loss of guide lubricant to gall the stem into the guide, stick open a second, and bend the pushrod/smash the valve face off.  

Anyway these are the two potential disasters in the early navistar idi, [kinda like the cummins 53 block cracking or potentially owning a 6.2gm diesel  ;D ] the rest is just basic maintenancy stuff.  I think the 6.9 may have also had insufficiently sized head studs that were bumped up in the 7.3 but my memory is foggy on that and i could be wrong.

I hated the fuel system on my idi.  It was the hardest priming truck i ever had and i parted ways with it during one of the rare instances when the thing was running well.  
Revelation 3:20

Offline moodnacreek

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Re: 2020 7.3 ford
« Reply #79 on: February 12, 2019, 01:41:45 PM »
Mike, the 7.3 idi  I mention has been with me since '92. The Roosa master style pump has been disappointing . Been through at least 7. Dumbest thing I did was buy cheap ones off E bay [diesel care]. Although the pumps won't last 100,000, if the pump is done right the engine runs well and gets good fuel mileage. I can change the fuel filter, start right up and drive away without a miss. Now don't get behind me if I got the trailer on !


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