The 1964 power steering pump service procedures, drawings and photos may be found on pages 19-30 through 19-44 at: http://www.jholst.net/64-service-manual/steering.pdf
During a quick read I did not find a service procedure for repairing a leak in the area you describe but the presence of an O-ring between the pump and reservoir is noted in the trouble-shooting section on Page 19-44, reproduced below but am unsure of formatting. Snugging up the reservoir mounting screws might suffice.
Leaks (a) Reservoir over-filled. NOTE: Operating the steering gear manually when the engine is not running will cause the steering gear to displace the fluid from
the steering gear housing which will then be forced out of the pump filler cap vent, giving a false indication of fluid leakage.
(b) Pressure and return hose connections and fittings.
(c) Reservoir to-pump-body "O" ring or mounting screws.
(d) Pump shaft oil seal.
(a) See "Fluid Level". Paragraph 1.
(b) Tighten all fittings, check hose for deterioration: replace any faulty hoses. If the discharge fitting is
leaking; See 'Tower Steering Pump Discharge Fitting Ferrule Replacement".
(c) Replace the reservoir "0" ring and tighten reservoir mounting screws.
(d) Replace oil seal.
Hoping this helps.
(The Real) Brentwood, CA
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Donald Nissen fast-ace@xxxxxxxxxxx [Chrysler300]
Sent: Tuesday, June 14, 2016 11:20 AM
To: 300 Group <Chrysler300@xxxxxxxxxxxxxxx>
Subject: [Chrysler300] Leaking Power Steering Pump
Hi all, I need some help from the 300K experts, or anyone who knows.
My pump is leaking, small so far. It is not from front seal behind the
pulley. It is also not from either hose. It seems to be wet on the
bottom of were the reservoir meets the pump. Does this mean it is
leaking from the rear of the pump, and the pump needs replacing or is it
the seal between the two? Or is it impossible to tell? All the
rebuilders I have checked so far supply the pump without reservoir and
pulley. Otherwise the power steering is fine-just annoying leak & I
want to get this fixed before Elkhart. Any help greatly appreciated.
Don Nissen, 300K
Posted by: "Rich Barber" <c300@xxxxxxx>
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