Re: {Chrysler 300} Power Steering Pump Cap

To my knowledge, with 9 different old cars, is that the power steering pump reservoirs and the fluid contained inside is not under pressure. Its on the return side. Generally there are fill marks that you are not to exceed so as to account for fluid expansion when it gets hot. It can get very hot and it can expand a lot. But its not under pressure.

The purpose of the non-sealing cap or cap with a vent hole is so that air displaced by expanding fluid has somewhere to go. If you overfill your pump the fluid is not going to come out the vent so much as from the cap or a neck O ring if its sufficiently hard and perished.

-----Original Message-----
From: "Marshall Larson" <granitledge@xxxxxxxxx>
Sent: Friday, November 19, 2021 12:01pm
To: "dplotkin" <dplotkin@xxxxxxxxxxxxxxxxxxx>, "300 club" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Power Steering Pump Cap

The usual point of leakage is the O ring between the reservoir and pump body. I believe increased pressure may cause leakage at that junction.

On Thu, Nov 18, 2021 at 3:47 PM dplotkin <dplotkin@xxxxxxxxxxxxxxxxxxx> wrote:

So long as you fo not overfill the reservoir it will not matter whether cap is vented or not.

Danny Plotkin

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: Marshall Larson <granitledge@xxxxxxxxx>

Date: 11/18/21 2:32 PM (GMT-05:00)

To: Ron Kurtz <mark6268@xxxxxxxxxxxxx>, 300 club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>

Subject: Re: {Chrysler 300} Power Steering Pump Cap

My caps are not marked as vented but they in fact are. Look at the center of the gasket inside the cap for a small + sign. It penetrates the gasket and is located below a raised area in the outside center of the cap. That area is tall enough to have fractured the metal to create a tiny hole at each end to allow venting.

On Thu, Nov 18, 2021 at 12:11 PM Ron Kurtz <mark6268@xxxxxxxxxxxxx> wrote:

Hello, everyone:

The service manual and parts catalog do not specify whether or not the cap is vented. I have a cap that is not stamped "vented." Is it okay to use on a '64 pump?

Best,

Ron Kurtz

E #292

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Marshall Larson
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Marshall Larson