From: James Shanks (n1vbn@bit-net.com)
Date: Mon Sep 22 2003 - 02:19:03 PDT
The reason for the electric oil pumps on railroad Diesels is to provide a
supply of oil to the bearings on the Turbocharger to cool the bearings down
for twenty minutes after shutdown when the oil pump would automatically
shutdown. This feature was usually negated when the personal shutting down
the engine would then immediately open the battery switch thereby shutting
down the oil pump.
This is on GE and GM Railroad Diesels.
Jim
At 12:33 AM 9/22/2003 -0500, Adam Suess wrote:
>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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James Shanks
n1vbn@bit-net.com
1998 IMZ 8.103
1984 H-D FLHT-C
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