Re: [Chrysler300] Power Steering Pump Query

[<smopar@xxxxxxxxxxxx>]

I have to say I have had no good results with Thompson pumps.   I rebuilt the original one on my C, using every step outlined in the service manual and it seems to have adequate output, even at idle.  But it is really noisy when turning the wheel when it gets warm and it too loses some assist at idle, but not as much as you are describing.  I then bought another one from a wrecking yard, and just tried it without rebuilding it first.  Same thing - noisy when warm.  I then rebuilt it to no avail.  I am at the point of retrofitting the 58 pump and brackets even though it isn't original.  I am a purist, so I hate doing this, but the Thompson pump has beaten me.  I think it was a one year only application, and I think I know why.  If someone else has been successful with this pump, I too would like to know.  
Steve Albu

---- rob kern <robkern@xxxxxxxxxxxxx> wrote: 
> Hello 300'ly to all!
>     Advice is solicited.....my newly rebuilt Thompson power steering pump  on my C is not liking to give me the power steering boost at idle and in parking situations that I think it should.  I set the idle rpm to 875 and put modern power steering fluid (MOPAR) with 1.5 ozs. STP to increase viscosity.  When the engine compartment is cold the steering is by 2 fingers or if the rpms are higher.  The steering box has been flushed and is clear of debris and the steering is nice and tight. It is beyond me why after driving and getting the engine temp to normal that the steering boost should slaken off and become very hard when assist is needed most. Power steering is perfect when driving, just when at idle or decelerating to make a turn or in a parking situation at idle does it get harder to steer.  Is there a modern replacement pump available to retro fit?  All and any suggestions will be greatly appreciated.  Oh, the belts for the pump pulley are new and matched and cogged and properly tensioned and there is no belt squeal or slippage whatsoever. A very reputable, experienced person rebuilt the pump and bench tested it to proper pressure output. This is supposed to be a full time power steering system, I just find it hard to believe that the original system was to behave like this on such an expensive vehicle for its time.  HELP!  ROB KERN
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