7.3 rebuild
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Senior User
Joined: Nov 2008
Posts: 104
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From: Sorrento BC, Canada
7.3 rebuild
I have a 1993 7.3 turbo engine that I'm rebuilding. The block had to be bored .030 thou over stock to clean up the bore. I had the machine shop pressure test both banks after boring and found there to be a pin hole(s) in no 6 cylinder. The machinist then tells me he has a non turbo block he will sell me, or sleeve #6 on mine. He tells me that if his block tests good then it would be a much better block then mine sleeved, and proceeds to bore it out .030 thou to clean it up. The non turbo block pressure tests good after boring. I asked my machinist if the block will get pin holes after with dca in coolant, he says definitely not. My worries are that it will get pin holes after I rebuild the engine since the pistons/rings wear on the bore and dca cant stop that from occurring. How thick do these bores come new? Also are there 6.9 pistons with turbo sized pin hole? Thanks.
Logistics Pro
Joined: Sep 2010
Posts: 4,411
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From: Victor, MT
As far as the 7.3, they have always had problems with the coolant w/o SCA's, the walls of the cylinders are just too thin in my aspect, and with the wear on the block, plus the added turbo on the truck creates more stress on the walls due to the extreme compression these old trucks need. With the SCA's its safer but no guarentee. BUT if you decide to sleeve a 7.3 cylinder then know this: the new sleeves will sink into the block if not correctly redone. make sure he leaves a lip or something of that nature to have the new sleeve sit on. .030 over is a lot. I will not bore a 6.9l over .010. So honing didnt fix the cylinder, in my expierience that usually works.
Posting Guru
Joined: Jul 2004
Posts: 1,627
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From: West Valley Utah
Get together with the guy in this thread (https://www.ford-trucks.com/forums/1...ne-swap-s.html) buy his engine to install. You will be much better off.
In my opinion, sinking a bunch of money into a worn out IDI 7.3 is like shoveling oats into a dead horse.
In my opinion, sinking a bunch of money into a worn out IDI 7.3 is like shoveling oats into a dead horse.
Logistics Pro
Joined: Sep 2010
Posts: 4,411
Likes: 4
From: Victor, MT
I would agree, its possible if the person doing the work knows what they are doing and doesnt screw you or you dont screw yourself over when it comes to the cylinders. I would resleeve them and stick with the regular bore, OR go with a 6.9l, the gain the stock 7.3 has over the 6.9 is not worth rebuilding a 7.3, when turbo-charging the 6.9 or even upgrading the N/A intake aspect part of it.
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