[AT] Statistics In Tractor Manufacturing

[Stephen Offiler]

For the record, in automotive engineering, the conversion between engine
hours and road miles is usually taken to be 35, not 60.  I've also seen 33
used.  It's a broad approximation of course  Vehicles used extensively on
the highway will be somewhat higher, and vehicles used extensively in heavy
traffic/city conditions will be somewhat lower.  It would be exceptionally
rare to find any roadgoing vehicle averaging 60mph.

SO


On Sun, Sep 15, 2019 at 7:07 PM James Peck <jamesgpeck at hotmail.com> wrote:

> Did you  have to replace the head casting or just remove it and have a
> valve job done including replacing the damaged valve? 1000 hours at 60 MPH
> would be equivalent to 60,000 miles on a road vehicle.. Maybe the original
> owner used it so gingerly he did not have the 1000 and 2000 hour service
> done.
>
> [ Cecil Bearden] I found a long time Ford tractor mechanic who worked in a
> dealership in the SW part of the state.  He told me that those engines
> would drop a valve at about 8000 hours if the valve clearance was not
> adjusted about every 1000 hours.  He also said if they were maintained in
> adjustment they would run 15000 without major failures.   The UK tractors I
> was referring to indicated that regular maintenance was performed on them.
>
> [ James Peck] Where do you get the information that an engine failure at
> 8000 hours is common with that engine. How does that square with the
> statement that tractors with that engine have gone 14000 hours without
> failure.
>
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