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Been there destroyed that
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83 Posts
Discussion Starter #1
I have found a '92 model na that needs an overhaul, still runs damn good for only running on 6 cylinders, and has 350,000 mi plus on it. My questions are how much money am I looking at just to overhaul this thing. It will be just a toy so I'm wanting to have fun with it. I'm new to playing with diesels so somebody clue me into what i'm getting myself into......
 

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IDI for life
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338 Posts
First off, does it need completely overhauled to start with? Why are the 2 cylinders not firing? I would do a compression test to see whats all going on with it and go from there. Might just need a pump and a set of injectors. 350k just means its good and broke in.
 

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STILL LEARNING
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18,324 Posts
You may very well need more than a standard rebuild. Check for coolant in the oil. May be caviated which means bore and sleeve the cylinders which gets EXPENSIVE. The 87-94 IDI 7.3 was know to do that
 

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Been there destroyed that
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83 Posts
Discussion Starter #4
Well Im not sure at this point if i want to do this or not thats why Im trying to get some numbers. I think I can get the truck for about a grand or less! I drove it and it will still motor on down the road pretty good, I got it up to 80mph, took a while but it did it. It blows white smoke at idle and of course runs rough cause its not firing on all 8. The tranny also seems to be good and tight. :shrug:
 

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IDI for life
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338 Posts
The white smoke could be unburnt diesel or from water. Does coolant dissapear in it? starting to sound more like its cavitated, or at the very least a headgasket. Were you able to get a compression test done?
 

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Been there destroyed that
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83 Posts
Discussion Starter #6
I havent had time for the comp test. Been busy but I dont think there is a coolant problem, The truck belongs to my uncle and he has had it since it was new, drove it till he thought it was wore out and then bought a new one. I've never heard him say anything about having to add coolant for any reason, I will ask him though.
 

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IDI for life
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338 Posts
Ill wager my bet as to what is going on, and just see if im right i guess.
Im betting you will find two cylinders next to eachother with little to no compression, via a burned out headgasket causing atomized unburnt diesel to go out the exaust.

This might be verified by checking the oil and see if its over-full, thinned out, or smells like raw diesel.
 

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Premium Member
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1,767 Posts
Ill wager my bet as to what is going on, and just see if im right i guess.
Im betting you will find two cylinders next to eachother with little to no compression, via a burned out headgasket causing atomized unburnt diesel to go out the exaust.

This might be verified by checking the oil and see if its over-full, thinned out, or smells like raw diesel.
Only issue I see with that is that would mean it blew through 2 fire rings. You think that is likely?
 

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IDI for life
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338 Posts
Assuming one burnt through and burnt across to the back side of the other, possibly. Would be taking heat and a beating from both cylinders. The only 2 headgaskets ive ever had to replace were both burnt out in this fashion. 87 Escort GT 1.9 HO and a 93 Cherokee 4.0 HO Although the bore spacing is alot tighter on those engines than an IDI so idk... anywho it was a guess, the compression test should at the very least rule it out or make it more legitamate.

EDIT:

Something else i just thought of, a headbolt could have failed or loosened up between two cylinders causing them to burn through or at least bleed off into each other.
 
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