[AT] Synthetic Oil

[Ken Knierim]

Mike,
    It could be turbo temperatures but it could be cooling the engine
evenly. Some engines crack heads if shut down fast. Dad made us idle the
Minneapolis Moline G-705's 5 minutes before shutdown and they were
non-turbo. They had a reputation for cracking heads,and magnafluxing them
would show cracks on any that had been run according to some of the
mechanics.
We picked up some at a salvage yard that had been magnafluxed and removed
from service for cracking (off a G-1000) that we put on a Massey 97 (G-705
painted in Massey colors after the Massey factory had a fire, I believe).
The Massey had been bought for parts for the other G-705 because it had a
cracked head. It ran fine but took a little oil from one cylinder that they
used a compression ring when the (re-used) oil ring snapped on
reinstallation. It was a cheap and dirty overhaul that put a scrap tractor
back in service, Dad still has it but it's been sitting awhile.. "ran when
parked".

Ken in AZ (well, PA today)


On Mon, Nov 14, 2016 at 6:02 PM, Mike M <meulenms at gmx.com> wrote:

> I guy I know that has an excavating company always lets his diesels idle
> for 15-20 minutes before shutting them down after a day of running. I'm
> wondering if it's meant to cool and keep lubrication going to the turbo.
>
> Mike M
>
>
> On 11/14/2016 7:10 PM, Henry Miller wrote:
> > The turbo vw uses on their small diesels has very little mass. It spins
> > down fairly quick, in general it doesn't do much in the parking lot and
> > so it mostly stopped and doesn't need oil on shutdown. Now if you pull
> > off the hiway and turn the engine off as soon as you come to a stop (or
> > before) there is a problem, but most people don't drive that way. Big
> > engines with big turbos often need more spin down time, as do people who
> > upgrade their turbo. From the factory people report few problems with
> > their turbo that can be traced to shutdown.
> >
> > Not that there is never a problem, turbos spin at 100000 rpm at high
> > temperatures. This is hard on any oil.
> >
>
>
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