6.9 and 7.3 interchange - Ford Powerstroke Diesel Forum
6.9L IDI Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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  #1  
Old 09-03-2010, 07:29 PM
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6.9 and 7.3 interchange

i know this has been beat to death and i did alot of reading today but never found the exact situation i have. i am gonna do an engine swap for a customer and try ing to find a good engine. his truck is an 85 f350 wirh a 6.9 standard shift.the engine was suppose to have been rebuilt by previous owner and has water in the oil and oil in the water. (previous owner died) i checked the cooler and its good. he's decide he just wants to find another engine to put in and use this one for spare parts.he just wants to use the truck on his farm. its not a daily driver. my dilema is i cant find another 6.9. i ordered one from a salvage yard that was suppose to be a 6.9 and had some fire damage but had low mileage.(been sitting on the shelf since 04 and they were glad to get rid of it) it got here and the damage wasnt that bad. the stickers are still on the v/c's. thats how i knew it wasnt a 6.9. its a 7.3 with turbo. im guessing a 94.it came out of a standard shift still has the flywheel. the other option i have is another guy i know has a 92 f350 non turbo7.3 standard shift truck that he will sell me the engine out of for the same price i gave for the burnt engine but it is a HIGH mileage truck. im wanting to know if the intake, i/p, injectors(all the stuff on top) and all the belt driven stuff(all the stuff on front of the engine) will work on the burnt 7.3 and drop in. i did get from reading some other post that the 7.3 should fit right in where the 6.9 came out.i was wonder about the turbo vs non turbo and swapping intakes and fuel system.the other option is buying the 2nd engine returning the first and dropping it in. i would apprieciate any insight.
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Old 09-04-2010, 08:25 AM
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ok well is the 7.3 an idi turbo or a PSD? thats gonna be the difference. the idi 7.3 is the same engine just bored out more and well with the turbo goodies its great.
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Old 09-04-2010, 10:06 AM
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im pretty sure its an idi. looks just like the 6.9. the engines look the same. i just want to make sure everything will bolt up. i will be putting the 6.9 intake,pump, injectors and all the stuff from the front of the 6.9 on the 7.3.psd started in 95 right. i got a 95 f450 with the psd and had a 94. this is the same engine that was in the 94.
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Old 09-04-2010, 10:22 AM
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It has injector lines? If so its an idi.
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Old 09-04-2010, 12:11 PM
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yes it has lines.
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Old 09-04-2010, 09:24 PM
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yup throw it in! my bud threw an idi in his service truck. same thing. just lil different cuz turbo on yours.
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Old 09-05-2010, 02:00 PM
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i wont be putting turbo back on. i will be putting 6.9 intake,ip,injectors on the 7.3. i also will have to use the alt,p/s pump and v belt set up from the 6.9. see any issues?
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Old 09-05-2010, 02:05 PM
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I dont see any issues. But why no turbo? It would help with the power and responce? One of our idis is turboless and the other is a 6.9 that is turboed. Sounds nice lol.
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Old 09-05-2010, 02:26 PM
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engine i bought to be a 6.9 that turned out to be 7.3 idi turbo doesnt have the turbo. everything on top has had some heat damage. 6.9 is all basically new its just getting water in oil and oil in water. answer is dont have the turbo and im trying to use what i have to give the customer more bang for his buck.
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Old 09-06-2010, 03:10 PM
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got the engine down to the short block. it suprised me at how clean it is internally. the heat didnt hurt anything. something that i did find that baffles me is that about 6 lifters had puked there guts out. i did notice the i/p was way off its static timing mark. one other thing that i noticed is on the heads where the fuel sprays in there is a few "spray holes"that have hair line cracks that are about 1/4" long. one other thing on my mind is whether to use the 6.9 or 7.3 pump gear cover. dont see any thing wrong with using either one. i will get the oil pan off tommorrow and check out the bottom end and hope to snap gauge all the cylinders. any body with any insight please chime in.
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