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Farm truck engine convert question

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mud

11-06-2006 12:40:48




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We have just been given a '88 Ford extended cab F-250 4X4 with no engine, but has an auto transmission.

Can this truck be converted to a manual transmission and 6.9 diesel reasonably?

What are the hidden expenses?

Thanks -




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Mike M

11-07-2006 06:55:40




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
Ford's are not known for parts interchangeabilty like the Chevy's are. Very tough to swap stuff in a Ford.



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Hal/WA

11-06-2006 21:34:07




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
If you have the diesel and stick transmission, it might be practical. Otherwise I think it would be cheapest to put back in the engine the truck is designed for. And if you have to deal with emissions inspection, it is a real can of worms to use any other engine, much less converting it to a diesel.

A friend of mine bought a recovered stolen Ford pickup some years ago. It had been a diesel, but the engine and transmission had been stolen. The chassis only had about 30K on it and it was in almost perfect shape, except for the missing engine and transmission. After pricing replacement diesels (probably the reason the pickup had been stolen to begin with), he converted it to a carbuerated 460 and C-6. He did a real nice job, and the pickup worked just great. Until he had to have emission inspection done on it....there was no way it could pass with the earlier engine and of course could not pass as a diesel. He went round and round with the licensing people, but they would not give him an exemption. He ended up selling this very nice pickup to a guy from Idaho, where they didn't have inspections, for about half what it should have sold for.

The electrical systems of those trucks is fairly complex, with different wiring systems depending on which engine the pickup was made for. If I was going to try to do it, I would try to find a similar truck with a bad body, but good drivetrain, like maybe a rollover, and plan on transferring a bunch of stuff from the parts truck.

It's sure not as easy as it was in the old days. My friends and I put a number of different engines in cars and trucks and no one really cared. They might now. Good luck!

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davpal

11-06-2006 21:02:12




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
I would find a 300 6 cylinder with a carb and a four or five speed tranny and put in it. Simple, effective, economical, dependable, powerful, perfect.



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KEB

11-06-2006 20:41:32




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
Check the 6.9/7.3 forum on thedieselstop.com. Lots of good info there, including guys who have done engine swaps. You have to join to post, but no big deal to do. The 6.9 was also mated up to the C-4 automatic, which might be a lot easier than going to a manual (not sure if the diesel bellhousing is the same as a gasser). I converted an old International Travelall from manual to automatic one time, which was pretty simple. Not sure I'd want to go the other way unless I had a complete donor vehicle with all the bits & pieces.

I had a 93 Ford with a 7.3 & factory turbo & a 5-speed. They have a generic problem with dual-mass flywheels coming apart, plus you can't resurface one if its worn. Mine was starting to chatter when I sold it. Several places sell replacement single-mass flywheels. Not as much power as the new-to-me Powerstoke I replaced it with, but a good truck & got about the same mileage as my 99. Handled our travel trailer just fine, although it was pretty slow going up a 6 or 7% grade at 10,000 ft...It had way too much split between 2nd and 3rd. Really needed another gear in between.

Pre-powerstroke Ford (International) diesels used a mechanical injection pump. In addition to changing from indirect to direct injection, the powerstokes are an electronically controlled engine using electrically actuated, hydraulically powered injectors.

Wiring for a pre-powerstroke diesel is about as simple as you can get. Off the top of my head there were only a few connections to the engine; a cutoff selenoid on the injection pump, a timing selenoid on the pump operated by a temperature switch, the glow plug feed & control wires, plus the usual guage connections.

I'm not sure what other problems you may run into. A diesel weighs considerably more than a gas engine, but I'm not sure how much difference there may be in the front suspensions.

Personally, I think it would be a fun project if it wasn't something I absolutely had to get done right away. Good luck,

Keith

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oldcraneguy

11-06-2006 16:55:18




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
Hidden expenses? well I dont know if theyre hidden but there are some things youll need, like wiring schematics or harness for the diesel, as well as clutch pedal, brackets, linkage and a booster pump for power brakes that used to be vacuum, prob have to find the right crossmember for the tranny tailshaft and also prob the driveshaft all this and more can be a piece of cake if youve got the donor truck that the eng/tran came out of, if not you gotta come up with this stuff somehow. Also you prob have to make arrangements for fuel return to the tank and I cant recall if they had a tank mounted supply pump but they prob did. The donor truck can make a night/day difference in this project...Th 6.9/7.3's were good engine but not bullet-proof Id check your prospect out REAL well before I dove in too deep...luck...Don

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KEB

11-06-2006 20:49:18




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 Re: Farm truck engine convert question in reply to oldcraneguy, 11-06-2006 16:55:18  
Forgot to add, the engines have a vacuum pump to run the brake booster & the heater controls. On the pre-powerstroke engine, the lift pump is a standard old mechanically actuated fuel pump. I don't remember mine having a return line, but its been a while. Pedals might be a problem if you can't find a set in a junkyard. Its a hydraulically actuated clutch, so I don't think there'd be any difference in the pedal setup between the gas & diesel versions.

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jdemaris

11-06-2006 16:13:33




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
It depends on if you already have the engine and trans, linkage,etc. A guy I know did the same thing last year - but he bought an 83 F250 with a 6.9 and four-speed manual for $500. It ran great but was completely rusted out. This gave him just about everything he needed.



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tmay

11-06-2006 14:36:41




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
I would have to agree with some the posts here. The 6.9 was not much engine to be honest. It was a Ford built engine before they went with the International power stroke. Not alot of power without turbo. I would look for 7.3 if I wanted a diesel. Good luck



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jdemaris

11-06-2006 16:09:47




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 Re: That's pure nonsense in reply to tmay, 11-06-2006 14:36:41  
Where did you ever get that story from? 6.9 and 7.3 are basically the same engines and Ford did not make either of them. 6.9 is an International Harvester engine - and they created it from a gas engine format. And before someone starts yelling - NO - I'm not calling it a gas-diesel conversion. But IH had an existing gas engine that was used as the basic block "footprint." Powerstroke is the same basic engine - but changed from IDI to DI around mid-1994. 6.9 was and is a great engine - just as durable at the 7.3 and perhaps a little more so since it is not as prone to cavitation. But, not having a turbo - it's not very powerful. I still have my 85 F250 and it's been great. I also have a 94 7.3 turbo that is NOT a Powerstroke - last one they made I believe before going to DI. It has all kinds of power, just as efficient as the later Powerstroke, and parts are much cheaper for it. And, I am by NO means a Ford guy.

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Aaron Ford

11-06-2006 17:40:18




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 Re: That's pure nonsense in reply to jdemaris, 11-06-2006 16:09:47  
Hey Now, whats wrong with Ford Guy's? What about Ford Girls? I can tell ya about Ford Kids. I got two and they are downright rotten. J/K LOL Aaron Ford



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Chad Franke

11-06-2006 13:18:12




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
My thought: Why bother. The 6.9 isn't near the engine that the new diesels are. Unless you have one sitting around I wouldn't spend anything for one, and even if I had one, worth more to part it out than to install it. I had one, got around 12-14 mpg, no more power than a small block. Buy a replacement motor for what was in there, will be easier, cheaper, and pickup will be worth more afterwards...if you are set on a diesel, step up to a Cummins (kits can be found), or at least a turbo 7.3...

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dhermesc

11-06-2006 13:38:02




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 Re: Farm truck engine convert question in reply to Chad Franke, 11-06-2006 13:18:12  
I agree, the 6.9 was decent back in its day, but that day was 20 years ago. A well tuned crate 302 will embarrass one today and would be a lot easier to install.



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Dan-IA

11-06-2006 12:53:28




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 Re: Farm truck engine convert question in reply to mud, 11-06-2006 12:40:48  
Hmm. Are the stick and diesel presently paired up? Do you have the full wiring harness for the new one? How do you intend to mate it to the existing wiring? Will it fit? How will you carve the hole in the floor for the stick?

Just a few thoughts, from someone that doesn't know a lot about it.



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