1992 F-700 6 cylinder diesel - TheDieselGarage.com
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post #1 of 16 (permalink) Old 04-02-2006, 05:54 AM Thread Starter
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1992 F-700 6 cylinder diesel

Hey guys,
I looking to buy a used dump truck. I found this guy that sells old state and some military trucks. His best truck is a 1992 F-700. It has a inline 6 with a turbo and an automatic allison with 2 speed rear. He claims it is a Ford engine. I thought Ford used Cat, International, Cummins engines. This truck has over 200,000 miles and he wants $9500.00. Its pretty clean with good tires and has new lift pump and cylinder. Any thoughts? opinions?
Thats about twice the money I wanted to spend, but I also want something reliable. I don't have time to be working on it everytime I need to use it. Also looking at a 1982 ford F-800 with a 3208 Cat. Its $5500.00 but it looks terrible. Oil and grease everywhere. Hood and one door about to fall off. Seller only had it 6 months and he doesn't know the true milage or when the engine was rebuilt. He swears its a great truck, but before I could take a good second look, the hose that lifts the dump busted. I'm going to look at a 1986 international later today for $6500.00 but all I know about it is that it has a diesel with manual tranny. The fellow that has the gov't truck was telling me that the 3208 cat and all the international / ford v-8 diesels are junk and that you just can't beat the allison auto tranny. He had some chevy trucks with v-8 diesels (I belive detroits?) that he said were very reliable. So any advise or anybody know where I can find a good truck? I live in Augusta,GA. :thanks:
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post #2 of 16 (permalink) Old 04-02-2006, 01:14 PM
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Quote:
Originally Posted by mjoiner
"Hey guys,
I looking to buy a used dump truck. I found this guy that sells old state and some military trucks. His best truck is a 1992 F-700. It has a inline 6 with a turbo and an automatic allison with 2 speed rear. He claims it is a Ford engine. I thought Ford used Cat, International, Cummins engines. This truck has over 200,000 miles and he wants $9500.00. Its pretty clean with good tires and has new lift pump and cylinder. Any thoughts? opinions? "
Ford built 2 diesels for medium duty trucks. one is a 6.6L six banger the other was a 7.8L six cylinder. Both are decent diesels, the 7.8L being the better & more powerful of the two. The only thing you gotta watch is parts availability since they were discontinued in '94. I had a 6.6L Ford diesel in an F-700 that gave me no problems.
Ford used the widest variety of diesels through the 80's & 90's. They used CAT, Cummins, Ford and Detroit diesels. Avoid the 8.2L fuel pincher in the F-800.


Quote:
"Thats about twice the money I wanted to spend, but I also want something reliable. I don't have time to be working on it everytime I need to use it. Also looking at a 1982 ford F-800 with a 3208 Cat. Its $5500.00 but it looks terrible. Oil and grease everywhere. Hood and one door about to fall off. Seller only had it 6 months and he doesn't know the true milage or when the engine was rebuilt. He swears its a great truck, but before I could take a good second look, the hose that lifts the dump busted. I'm going to look at a 1986 international later today for $6500.00 but all I know about it is that it has a diesel with manual tranny. The fellow that has the gov't truck was telling me that the 3208 cat and all the international / ford v-8 diesels are junk and that you just can't beat the allison auto tranny. He had some chevy trucks with v-8 diesels (I belive detroits?) that he said were very reliable. So any advise or anybody know where I can find a good truck? I live in Augusta,GA. :thanks:"
The Cat 3208 gets mixed reviews. It's a lower HP, but torquey, high displacement V-8 diesel. The 3208 was also discontinued ~10 years ago and is getting tougher & more expensive to get parts for. The turboed versions ran from 210-300HP. Most dump trucks got n/a 180-210 HP or 210 turboed. Tandems would get 210-250 HP turboed most of the time.

IH is the biggest medium duty diesel engine builder in the world. Theyhad one diesel that could be avoided. In the 80's, the 9L diesel is the one that comes to mind. In the 80's or 90's, if it has a DT360, DT408, DT466 or DT530, you have nothing to worry about as these are rock solid diesels. The DT466 is the top of the class for all brands of M/D diesels and is pushing over 30 years in production.

80's & early 90's Chevy diesel trucks used primarily Detroit & Cat Diesels. In M/D applications, you should avoid the 8.2L "fuel Pincher" diesel. They also used 3208's and possibly 6V71's in early 80's.

In my opinion, IH makes the best M/D dumptrucks for vocational/contractor useage. Sure Peterbilt/KW are nicer, but they're "cadillac" trucks. For everyday useage, you can't beat IH. The early 90's F-800s, with an 8.3L Cummins are a nice catch, too.

Take a look here for a good used diesel dumptruck. Look under "heavy duty trucks"

http://www.truckpaper.com/default.as...4692AD749B8092
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post #3 of 16 (permalink) Old 04-02-2006, 01:53 PM
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post #4 of 16 (permalink) Old 04-02-2006, 09:36 PM
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7.8 was available up to 300hp in stock form -
Uses a Bosch pump that may be the "P" pump used in similar era DT 466 and Cummins 12v series making power increases a snap.
The engine is made in Brazil and was used extensively in Ford and New Holland farm machinery. There was an issue with pistons on some of them and I don't recall the nature of why. Others get great performance and mileage out of them. Some guy back east tractor pulls with them.
Same company that made them in Brazil now belongs to International and makes a 7.8 liter engine that is the "big" Duramax used in the new Top Kick line. I do not know if there is any direct ancestry involved - blocks/heads/ etc but they do share identical configuration I6 and their size is the same. Somewhat suspicious is that they claim there are already 300,000 of they 7.8 engines in operation around the world pre-duramax. Could it be the same? I would be buying a MD for all around use but my better half has decided she likes our truck now.

2000 F-250 PSD 6 speed 4x4 Lariat
1959 Kenworth CC 925 NTC-400 5x3 4.10 SQHD's
Myriad of parts and pieces in my garage
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post #5 of 16 (permalink) Old 04-02-2006, 09:57 PM
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A guy I know that turned up a '89 7.8L Ford without a turbo change and a pyrometer to watch temps melted a piston within a couple months so one must dial the pump with caution.
My DT is bumped, but I installed a pyro.
The thing that guys that only turn pumps up in smaller trucks don't realize is that a diesel in a M/D has much more stress put on it than in a pickup. Turning up the pump in a 7,500 lb pickup is not too dangerous. Do the same thing to a 15,000 lb dump is quite a different story.

all that said, I'm sure they can make lots more power than they were ever sold with stock. Just gotta watch the EGT's.
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post #6 of 16 (permalink) Old 04-03-2006, 05:47 PM
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7.8's are a notorious motor. They put the same motor in Ford's 8000-9000 series tractors...The truck version of the motor was a real POS. I have known multiple people that have replaced their 7.8's to 8.3 Cummins motors. The tractor version was a lot better motor than the truck version. I think the major difference in the motors is that the truck motors were built in Brazil and the tractor motors were built in England.

'04.5 Chevy 2500HD LLY,Alli, CC, SB, 4x4, Sleeved, Braced, FASS, 4" SS Silverline exh, EGR Blocker, all thanks to MA, EFI Live tuning by me with Edge CTS switching DSP5 tunes, 68mm Danville turbo, ARP Studs with "C" gaskets, Transgo Jr., 20x9 Diamo Karat 8's wrapped in Terra Grapplers, Superlift AAL in rear, Ride Rite Air Bags, some stainless........yeah it shines.

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post #7 of 16 (permalink) Old 04-03-2006, 06:00 PM
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I've never seen any except the ones from Brazil. Buddy of mine has a dozen of them in L & F series Fords and about a dozen CAT 3208's in L's & F's.

He tells me the 7.8L Fords last longer and are actually a bit less troublesome than the CAT 3208's in the same application.
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post #8 of 16 (permalink) Old 04-03-2006, 06:07 PM
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Unless youve been around the tractors you wont see them...8700 and 9700 Ford tractors had them. 8700 was non-turboed.

'04.5 Chevy 2500HD LLY,Alli, CC, SB, 4x4, Sleeved, Braced, FASS, 4" SS Silverline exh, EGR Blocker, all thanks to MA, EFI Live tuning by me with Edge CTS switching DSP5 tunes, 68mm Danville turbo, ARP Studs with "C" gaskets, Transgo Jr., 20x9 Diamo Karat 8's wrapped in Terra Grapplers, Superlift AAL in rear, Ride Rite Air Bags, some stainless........yeah it shines.

2002 VW Jetta GLS TDI, auto, 18x8 ASA AR3 wheels with Goodyear Eagle GT's
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post #9 of 16 (permalink) Old 04-03-2006, 06:16 PM
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Yeah, I'm talking truck engines. '

Are you sure the 7.8L engines say "made in England"? Because I know many Ford tractors themselves say "made in England" on them, like on the frame. I had a Ford 2 WD front end loader that was built in England. My 555 4x4 backhoe was made in Belgium, but the diesel wasn't.
Can't remember what the diesel engine in the front end loader said on it. Too many years ago.
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post #10 of 16 (permalink) Old 04-03-2006, 06:19 PM
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I take that back....got to looking at some stuff....the tractors had a 401 in them the 7.8 is a 474....my bad I apologize...but anyway...I have known quite a few people that have replaced thier 7.8's....but no personal experience other than the tractors.

'04.5 Chevy 2500HD LLY,Alli, CC, SB, 4x4, Sleeved, Braced, FASS, 4" SS Silverline exh, EGR Blocker, all thanks to MA, EFI Live tuning by me with Edge CTS switching DSP5 tunes, 68mm Danville turbo, ARP Studs with "C" gaskets, Transgo Jr., 20x9 Diamo Karat 8's wrapped in Terra Grapplers, Superlift AAL in rear, Ride Rite Air Bags, some stainless........yeah it shines.

2002 VW Jetta GLS TDI, auto, 18x8 ASA AR3 wheels with Goodyear Eagle GT's
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