Re: [Chrysler300] 413 oll pump

["Thomas Miller" <tfm@xxxxxxxxxxxx>]

Hi Bob,

I can't help but think that with the electrics (I just cant' bring myself to call them "electronics!") in our cars being 50+ years old, starting your troubleshooting by investing $30 in an oil pressure gauge to see if the problem is indeed oil pressure or the devices that currently measure your oil pressure.  

You could easily unscrew the existing sending unit, replace it with a "tee" fitting and temporarily run both the additional gauge and the original.  If you go down this path, I'd be interested in what you find.   Thanks.

Take care!

Best Regards,

T.F. Miller
tfm@xxxxxxxxxxxx 
'57 300C, '57 New Yorker T&C, '70 440+6 'Cuda

>>> Michael Moore <mmoore8425@xxxxxxx> 9/25/2011 6:54 PM >>>
Bob,
My H developed low oil pressure and high temps intermittently and  
drove me bananas. It turned out to be the instrument voltage regulator  
which provides power to the temp and oil pressure gauges. My temp  
would go up, my oil pressure down. I replaced the radiator, fan  
blades, water pump etc trying to get the temp down because I thought  
the high temp was causing the low pressure.
Mike Moore
On Sep 25, 2011, at 3:39 PM, Bob Jasinski wrote:

> I have no problem with oil pressure above idle speed whether the  
> engine is
> hot or cold, the driving pressure is just fine, at least 1/2 to 2/3rds
> pressure on panel gauge. The drop in pressure only happens after an
> extended run, on a hot day, like when you come off the freeway and  
> are at a
> light in gear, or dead stopped on the freeway in traffic, with the  
> engine
> idle around 650-750 RPMs. The pressure literally drops to a zero  
> reading on
> the gauge, and that is what concerns me, especially if you are  
> stopped in
> traffic for long periods.. As I sit there looking at no pressure I  
> envision
> the bearings running with no lubrication and worry about it. This has
> happened with two different brands and weight of oil, 10-30W and  
> 10-40W, but
> did not happen with the 20-50W. I also am running the prescribed  
> amount of
> Redline zinc additive, which I believe tends to thin the oil a bit.
>
> Maybe I should try a straight weight oil, but I think the problem  
> could just
> get worse with a straight 30W, as the viscosity won't increase with
> temperature as do the multiweight oils. As I see it, the needle  
> should at
> least be at the bottom of the pressure indication, even at idle, not  
> at
> zero.
>
> Bob
>
> From: mgoodknight@xxxxxxxx [mailto:mgoodknight@xxxxxxxx] 
> Sent: Sunday, September 25, 2011 2:22 PM
> To: rpjasin@xxxxxxxxxxx 
> Subject: RE: [Chrysler300] 413 oll pump
>
> Bob,
> I should have added: the fact that you have lower oil pressure at idle
> with 10w-40 does not mean that you have lower oil pressure at speed.  
> It is
> quite likely that your pressure is still being limited to around  
> 60-70psi by
> the pressure relief system. Supplying too much pressure to the  
> bearings can
> cause erosion of the soft materials that make the good bearing  
> surfaces on
> the bearing inserts. In race conditions that erosion risk is tolerated
> because of frequent bearing changes.
> Marshall Goodknight, retired engine failure analyst and long time  
> engine
> technician with Mechanical Engineering education
> ---------- Original Message ----------
> From: "Bob Jasinski" <rpjasin@xxxxxxxxxxx>
> To: "'Bill Huff'" <czbill@xxxxxxxxxx>, <chrysler300@xxxxxxxxxxxxxxx>
> Subject: RE: [Chrysler300] 413 oll pump
> Date: Sun, 25 Sep 2011 13:24:26 -0700
>
> Because a year ago I changed the oil to 20-50W and the problem went  
> away.
> Last week I changed the oil back to 10-40W and the problem came  
> back, so I
> figure it is the pump, but I am open to suggestions as to other  
> causes.
>
> Bob J
>
> From: Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com 
> >
> [mailto:Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com 
> > ]
> On
> Behalf Of Bill Huff
> Sent: Sunday, September 25, 2011 1:05 PM
> To: Bob Jasinski; chrysler300@xxxxxxxxxxxxxxx 
> <mailto:chrysler300%40yahoogroups.com>
> Subject: Re: [Chrysler300] 413 oll pump
>
> What made you settle on the oil pump as the reason for low oil  
> pressure?
>
> Bill Huff
>
> 3:27 PM, Bob Jasinski wrote:
> >
> >
> >I think it's time to replace the oil pump in my 300G. I'm noticing  
> pressure
> >is dropping to a very low level on a hot day after a long drive  
> while in
> >gear and idling (went to the Ironstone Concours in Murphys yesterday)
> >
> >I looked at Rock Auto, and they list 3 different oil pumps all from  
> the
> same
> >manufacturer (Sealed Power) and one is standard, the second is
> >"High-Volume", the 3rd is "High Pressure". Prices are only $10 more  
> as you
> >go up.
> >
> >What gives? Why should I go with a standard pump if the other two  
> are so
> >close in price? Is there a problem going with a non-stock pump?  
> Could it
> >blow out seals in an older rebuilt engine? Those in the know please  
> share
> >your knowledge on this.
> >
> >Thanks!
> >
> >Bob J
> >
> >[Non-text portions of this message have been removed]
> >
> >
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
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