From: Adam Suess (ajsuess@hotmail.com)
Date: Sun Sep 21 2003 - 22:33:17 PDT
I've read some where that a high % of engine where occurs at start up.
Something like 70% or 80%. the way I understand it is that during normal
engine operation the bearings and other parts ride on a thin film of oil and
should not normally directly contact the two metal faces. when a engine sits
for a bit much of the oil drains down and upon start up no film is present
to prevent metal on metal contact. In the case of the multi fuel and other
engines the oil also drains back out of the filters and when started the
pump must fill them up again before oil goes to the moving parts. The
difference in engine noise is some more rattling and also internal engine
friction until the oil reaches it. I use to work on the rail road and got
this info from one of there diesel mechanics after inquiring how they got
there big diesels to last so many hrs. Also there is some issues of oil
break down during operation due to high oil temps or over lugging the engine
exceeding the pressures the oil can protect at. All second hand info to me
but seems to make since. The Rail Road ran straight 50wt and the engine
had oil pressure “electric pumps” before even cranking it to start they
rarely shut it off any way. I switched to semi synthetic oil myself because
it is suppose to hold to the parts better after shut down. Also tolerates
higher temps and pressures or so they advertise. I did note a significant
drop in full load oil temp switching from Shell Rotella T to Cenex Maxtron
DEO in my tractors as well as easier cranking. Lighter engine loads I saw
little or no change in oil temp. The Mack engine in my M54A1 takes quite a
while to get pressure and sounds much different once it does also.
Adam Suess
>From: Marc Strangfeld <curlyjoe98@yahoo.com>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Subject: Re: [MV] M35 dry start issue
>Date: Sun, 21 Sep 2003 07:50:35 -0700 (PDT)
>
>Don't forget...oil pressure is needed to lube more
>than just the turbo. I don't rev it up either. Can
>anyone else notice a change in engine sound once oil
>pressure is restored? I'll look into the preluber
>idea. However maybe Jon is right in saying I don't
>need to worry. What does everyone else think? I
>sense an interesting tech article in Military Vehicles
>Magazine...Bjorn?
>
>
>Marc
>
>
>
>--- Jon Shoop <shoop19@brick.net> wrote:
> > I dont think think is a problem.....I know the turbo
> > has a pocket for oil to
> > rest after shutdown......just dont rev it up...wait
> > the 10 seconds for oip
> > pressure to come up.........
> >
> > Jon
> > ----- Original Message -----
> > From: "Marc Strangfeld" <curlyjoe98@yahoo.com>
> > To: "Military Vehicles Mailing List"
> > <mil-veh@mil-veh.org>
> > Sent: Sunday, September 21, 2003 1:43 AM
> > Subject: [MV] M35 dry start issue
> >
> >
> > > I'm wondering what other's thoughts are on the
> > long
> > > delay in getting oil pressure on the multifuel
> > engine.
> > > I crank my engine with the fuel shut off for a
> > few
> > > seconds thinking it may help. Am I worrying for
> > no
> > > reason and/or burning up my starter? Does anyone
> > know
> > > of a way to prelube the engine or change the
> > filter
> > > configuration to keep them from draining?
> > >
> > > Thanks
> > >
> > > Marc
> > >
> > >
> > >
> > >
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>
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