6.9L Durability ?
Thread Starter
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More Turbo
Joined: May 2002
Posts: 594
Likes: 5
From: Wetumpka, Alabama
6.9L Durability ?
I'm looking to buy an 86 F250 w/6.9L Diesel. It has 144k miles and had the headgaskets/glow plugs replaced around 20k miles ago. It also has a rebuilt pump on it as well.
How durable (Service Life ? mileage ?) are these engines and what issues do I need to be aware of on them ?
TIA
How durable (Service Life ? mileage ?) are these engines and what issues do I need to be aware of on them ?
TIA
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
85 and 86 6.9l engines were the strongest longest lasting engines International ever made for Ford. 83 and 84 6.9s had some lower block problems and 88-94 7.3s were bad about rubbing a hole in the cylinder wall. Properly cared for, they will last forever, it is not uncommon to see them with 300k and still ticking strong.
Postmaster
Joined: Mar 2008
Posts: 3,255
Likes: 0
From: Sweet Home, OR
I'm a Dodge-Cummins guy that has grown to love IDIs.
Everything Andys Fords said is spot-on.
The only "issues" I would be aware of are the fuel system needs to be AIR LEAK FREE and the glow plugs/system needs to be up to snuff.
Everything Andys Fords said is spot-on.
The only "issues" I would be aware of are the fuel system needs to be AIR LEAK FREE and the glow plugs/system needs to be up to snuff.
Thread Starter
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More Turbo
Joined: May 2002
Posts: 594
Likes: 5
From: Wetumpka, Alabama
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I have worked the crap out of mine since day one.
At 300K I rebuilt it with a few extras.
When I did the rebuild the engine was still running great, the oil consumption was getting rather costly though.
Now sitting at 431K.
At 300K I rebuilt it with a few extras.
When I did the rebuild the engine was still running great, the oil consumption was getting rather costly though.
Now sitting at 431K.
