[AT] Dodge diesel oil filter number

[Rob Wilson]

Charlie,
  All the information I have tells me that these engines are bypass filtered
engines and if the filter has no backpressure then all the oil goes to the
filter and not the engine. Here's a quote from one of the guys on the A-C
page. I personally don't care what you or anyone else wants to use as
a filter to each his own. I'm merely offering information to save you a
few bucks.


The B (and some others like it) has a bypass type of lubrication system. It
is NOT like the typical full flow systems used on modern automobiles. With a
bypass system, about 15% (at least on the B) of the oil pump flow is sent
directly to the sump via the oil filter. That 15% does not go to the
bearings. There are too basic parallel paths to the sump from the pump. One
is through the bearings and the other is through the filter, assuming the
relief valve is not discharging. Depending on the details of the
restrictions in the flow path through the filter, the filter resistance
itself can have an effect on the flow quantity through this bypass path. If
the filter resistance is less than designed for by the OEM (Allis Chalmers),
then a greater flow will be bypassed to the sump than originally intended.
Since the pump flow is constant for any given engine speed, that means less
will be sent to the bearings. This situation results in a lower oil pressure
being observed at the pump discharge and recorded by the pressure gage. That
is the exactly the case with the newer design NAPA 1101 filter. It has a
lower filter resistance than AC designed for and is much more like a
low-resistance full flow filter that one would see on an automobile. Dumb
design change by WIX (manufacturer of filters marketed under the NAPA brand
name).

Rob

----- Original Message ----- 
From: "charlie hill" <chill8 at cox.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Friday, April 09, 2004 4:15 PM
Subject: Re: [AT] Dodge diesel oil filter number


> Rob,  I have a reproduction of a B manual on my desk right now.  The oil
> pump has a presure regulator.  The line from the pump has a Tee in it
before
> it gets to the filter.  One outlet of the tee goes to the valve train, the
> other goes to the filter housing where the oil is pumped through the
center
> tube to the top inside of the filter where it is forced down through the
> rags and then flows out to the block and the mains.   I don't understand
how
> restricting the oil flow ahead of the filter can create more oil presure
to
> the mains.
>
> Charlie
> ----- Original Message ----- 
> From: "Rob Wilson" <rowilson at infinet.com>
> To: "Antique tractor email discussion group"
<at at lists.antique-tractor.com>
> Sent: Friday, April 09, 2004 11:40 AM
> Subject: Re: [AT] Dodge diesel oil filter number
>
>
> > Hi Charlie,
> >  The reason for the rag filled filters is not a technology
> > issue but a design issue. The A-C engines need back pressure
> > created by the filter to push oil to the mains. Without this
> > the oil bypasses the mains and gets filtered over and over.
> > As for WIX paper technology I believe they were one of the
> > first to use the paper element since they started in 1939.
> > They were a very innovative company.
> >
> > Rob
> >
> > > Hi Rob.  I won't argue that point with you as I don't know anything
> > about
> > > the Wix/AC filter failures BUT one thing I will bet you is this.
> > > If paper filter technology had been available in 1940 AC would have
> > never
> > > used those rag packed filters.
> >
> >
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>
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