I was watching this slideshow on the Ford 6.7 diesel and the engineers were saying that they tested the engine to 250,000 miles.

Diesel Forum Presentation

Does anyone know what International tested the 7.3 to? I know there are alot on the road with 400k+ miles. Was the 7.3 a freak of nature or was it designed that way?

 

I will vote freak of nature.hahaha

 

When we bought our 7.3 work trucks we scheduled them for engine overhaul at 300k miles because that was what the dealer said the life expectancy was.

Since then we have had 2 trucks run over 600k until we traded them in. At the time they were still running fine. For the remainder of our fleet, we adjusted the overhaul marker to 500k and will see what they look like when the time comes.

Not sure what the 6.7 published life is...I think it's still at 300k according to Ford. The Cummins 6.7 is 500k.

 

The freak of nature is the EPA.

 

I think rear axle ratio has something to do with engine life.
My F550 with 4.88 is on it's second engine, replaced at 105,000 miles.
It didn't blow up, but developed a knock that was audible on deceloration.
I didn't want to be stranded somewhere out on vacation with the 5th wheel so I elected to replace it.
Bfife's F550 is on it's second engine too. He bought it that way from the government and it was replaced somewhere in the 30,000 mile range according to the report when he bought it.

 

Per International's literature, the T444E has a B10 life of 200,000 miles and a B50 life of 350,000 miles, which is the same as the older 5.9 Cummins B series. With Ford's programming, I don't know, but can reason those aren't too far off from what I have seen.

Note: Cummins does not publish B10 for their ISB 5.9 directly, only B50

 

What's the definition of B20 and B50?

 

I think it is described as the "half life" of the engines. If I am correct, I think it means that 20% of the engines will require a major overhaul at 250,000 miles and 50% of them will need a major overhaul by 500,000 miles.


We will see what the pros think but I thought I read this somewhere before.

 

The definition of Bx life as per International is 'requiring major repair which requires head removal or oil pan removal.'

 

Does B20 mean that International projected that 20% of their T444Es were likely to require major repair by 250,000 miles? And does B50 mean that 50% were projected to require a major repair by 500,000 miles?

 

Yes, major as in one or both heads off, or oil pan coming off. I misquoted the B50 as 500,000 mi whereas it really is 350,000. This is ONLY an estimate though!

 

If the oil pan coming off is a marker for the B10 or50, then the mileage would have to he way lower than 300k. Simply due to oil pan rust.

My 7.3 made it just shy of 170k. It's a good thing I have a cummins with 300k to get me around, or I'd be pedaling a huffy.

 

x2
i think the reason it last is it is simple KISS. all the new ones have 100 sensors more to go bad.

 

I would like clarification too.

 

Whats for say ford the 6.0L for life