[AT] Dodge diesel oil filter number

charlie hill chill8 at cox.net
Sat Apr 10 00:00:18 PDT 2004


Rob,  I wasn't trying to say you were wrong.  Just trying to understand what
you were saying.  I'm still not sure I understand how this works.  I'm going
to have to look at the oil piping a bit more I guess.  BTW I only use the
real rag stuffed filters anyway.

Charlie
----- Original Message ----- 
From: "Rob Wilson" <rowilson at infinet.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Saturday, April 10, 2004 1:01 AM
Subject: Re: [AT] Dodge diesel oil filter number


> 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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