Re: [Chrysler300] 413 oll pump

["Ron Waters" <ronbo97@xxxxxxxxxxx>]

Bob -

I would think that if your oil pressure actually dropped to zero, you would 
be experiencing that via rough idle or some other symptom, such as your 
engine stalling and refusing to start. I would begin with the sending unit, 
as that could very likely be faulty. If you still experience problems, I 
would look at the gauge next.

Ron


----- Original Message ----- 
From: "Bob Jasinski" <rpjasin@xxxxxxxxxxx>
To: <mgoodknight@xxxxxxxx>
Cc: "'Chrysler 300 List'" <chrysler300@xxxxxxxxxxxxxxx>
Sent: Sunday, September 25, 2011 6:39 PM
Subject: RE: [Chrysler300] 413 oll pump


>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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