Re: [Chrysler300] Chrysler 300 Hurst oil pressure

[Russ Vaughan <Pacesetter300@xxxx>]

HI guys, First of all, 95% of the time this problem will go away if you just add oil ot the filter before installing it. If the pump worked fine before you drained the oil, I doubt there's any need to do anything but get it primed again. 

As for high volume and high pressure pumps neither are really needed or desired unless the engine is set up with racing clearances. I have to disagree with Mike a little. He's certainly correct for high pressure pumps. High volume pumps really aren't the ticket for our Big Blocks either. Love them as we do and as well designed as they are, they do have a flaw from an oiling prespective. They have very poor drain down at higher RPM's. One of the reasons Chrysler went to six bolt valve covers is to eliminate the leaking with the four bolt covers. Note Chevy had 4 bolt covers until '87 with no oil retention and leaking issues like Chrysler had. Run a 413 up 5 - 6 grand for any period of time and the upper end will collect a lot of oil. Of the six quarts typically held, there might be four or more in the top end of the motor. A high volume pump will only make that problem worse and put even more oil at the top of the motor. Once the oil has done it's job and lubricated
the part it went to, it needs to get back in the sump as soon as possible. NOT hang around the top of the motor creating a lot of friction, pressure and things that do the motor no good. This is one of the reasons why a windage tray is usually good for about 15-30 Hp. It keeps the oil down in the sump where it can't rob HP. 

300ly

Russ Vaughan



paul holmgren <paulholm@xxxx> wrote: 
Mike Apfelbeck wrote:

> Steve,
> Sounds like the oil pump lost its prime. You could remove it and pack the
> gears with white grease or Vaseline to get things restarted.The dealer
> should have an "oil pump repair package" for a few bucks that contains all
> the gaskets and "o" rings needed to service the oil pump. A long rotor,
> high volume pump is available from Chrysler under part number P4007177.
> I like to use a high volume pump, with a stock bypass spring inside, to
> maintain stock oil pressure levels. Excessively high oil pressure in a
> stock motor gains you nothing in the long run, it puts extra strain on the
> distributor drive gear and takes more power to maintain (can actually
> reduce gas mileage).Be careful about paying big bucks for a "high
> performance " pump, sometimes these are just made up from standard castings
> with stiff springs in the bypass for higher oil pressure. A high volume
> pump should have a longer body than a standard one because of the taller
> gears inside.
> Mike

WHOA THERE Folks, before you try dropping the pan to get at the pump,
Please think about what folks do to prime a fresh motor.
Get a Priming rud/tool, poping out the distributor is WAY easier then
dropping the pan and going after the pump. a few miniutes with the
electric drill and the priming tool will tell you something at least!


-- 
Paul Holmgren
Hoosier Corps #33, L-6
2 57 300-C's in Indy

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