Old 6.9 idi

Frstdiesel · Apr 18, 2018

Hey guys, I just joined oilburners.
I recently acquired an 84 F250 with 6.9 and Banks turbo.
4 speed manual.
I got it from the original owners family it has 90k on the clock. Truck is complete and all original.
Problem is i drained close to 3 gals of water out of the oil pan.
This I believe is due to the valley pan is rusted through due to rain water getting by the cowl/hood seal.
Anyhow pulling the engine and replacing all seals and gaskets and I want to check the bearings while I'm in there as the owners family was trying to get it started several months before I got it.
I'm concerned they may have tried to crank it with the water in the pan.
Any suggestions on a course of action?
Total disassembly of short block?
New bearings,rings etc?
Thanks

Hydro-idi · Apr 18, 2018

I would start by pulling out the engine and remove oil pan & cylinder heads. While your at it, take a bearing cap off and inspect it for wear. Proceed from there depending on what you find. Post some pics if you have questions about anything “internal engine” related.
It really depends on how far you want to go with this, but I can tell you that water sitting in an engine for long periods of time really screws them up and warrants a rebuild some of the time.

DrCharles · Apr 18, 2018

If the engine is solid rust inside, I'd recommend getting a 7.3 (even a non-turbo one) and dropping that in. The 7.3 has better head bolts and with studs is even stronger. And the extra displacement never hurts power...

Hydro-idi · Apr 18, 2018

DrCharles said:
If the engine is solid rust inside, I'd recommend getting a 7.3 (even a non-turbo one) and dropping that in. The 7.3 has better head bolts and with studs is even stronger. And the extra displacement never hurts power...

This goes both ways. Yes the bolts are bigger, but ARP’s solves that problem on a 6.9. Extra displacement really isn’t even noticed between the two. And then add the thinner walls on a 7.3 idi making it more prone to cavitation....I’m more of a fan of the 6.9 idi.

Frstdiesel · Apr 18, 2018

Thanks guys.
That is my original line of thought.
I'll post updates as they come

Thewespaul · Apr 18, 2018

Welcome to the forum! I see you’re located in east Texas, I’ve got a couple complete pullout 7.3s if you want to go that route.

And we need to see some pics of your new truck!
:popcorn

Frstdiesel · Apr 19, 2018

Ok cool.
I'll know more once I get inside of it.
Pics to come as soon as I figure out how to do it.
Thanks

Ethan Smith · Apr 19, 2018

I opened up a 6.9 thatd been sitting here in oregon a few years with water all in it. Had to bam bam the pistons out with an oak branch. Would have been able to clean it up but it was already bored 3 over stock, wasnt worth it to try and see if itd clean up past that.

Frstdiesel · Apr 27, 2018

Ok guys I opened up the 6.9
Yep a rusted through valley pan was the reason for the 3 gals of water in the oil pan.
However the engine is incredibly clean on the inside.
Crank, pistons, bearings are all in great condition.
Everything is standard as it only has 90k miles on it.
So far the only issue I have encountered is some very slight corrosion on a few of the cam lobes.
Polishing with scotch-bright removes a good portion of it.
The majority of it is not in the "track" of the roller on the lifter, however a couple lobes have some spots in the lobe track.
Suggestions?
Thanks

Thewespaul · Apr 27, 2018

Can you post up some pictures? A little corrosion for one guy is a lot for another. But from what it sounds like it’s not bad

Frstdiesel · Apr 27, 2018

Yes I will as soon as I can figure out how to upload pics.
I may have to get my kids to show me how.

Frstdiesel · Apr 27, 2018

Cam lobe pics

You must be registered for see images attach

Frstdiesel · Apr 27, 2018

Here they are don't ask me how I did it.....

Thewespaul · Apr 27, 2018

I really don’t think that’s bad, I’ve pulled cams out that looked worse than that and those engines ran fine. Can you catch on any of the pitting with your finger nail or is it smooth?

Frstdiesel · Apr 27, 2018

Yeah fingernail catchs ever so slightly

Old 6.9 idi

Frstdiesel

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