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I am still dealing with the steering situation. My steering feels a little bit spongy / overassist.
I drove the Truck with this setup ( Thompson Pump & Mustang II Rack / Pinion) 500 miles in the meantime.
Now the pump starts to whine, I let my son steer while the truck was stationary and saw that the power steering oil was spilling and foaming over.
Now I think that not only the pressure plays a role but possibly also the volume, could it be that the servo pump breaks down if the pressure or the oil volume for the steering rack is too high?
But from what CBeav says, the Ford/Thompson pumps typical working pressure of 600-700 psi. and a dead-head pressure around 1200.
And according to the TCI instructions the recommended pump output for the R&P is 800-1000psi and 2.0 gallons per minute.
So the pressure of the Thompson pump should not be much too high!
The question then arises as to whether the delivery volume is too high and the rack-and-pinion steering can not handle it?
I am still dealing with the steering situation. My steering feels a little bit spongy / overassist.
I drove the Truck with this setup ( Thompson Pump & Mustang II Rack / Pinion) 500 miles in the meantime.
Now the pump starts to whine, I let my son steer while the truck was stationary and saw that the power steering oil was spilling and foaming over.
Now I think that not only the pressure plays a role but possibly also the volume, could it be that the servo pump breaks down if the pressure or the oil volume for the steering rack is too high?
But from what CBeav says, the Ford/Thompson pumps typical working pressure of 600-700 psi. and a dead-head pressure around 1200.
And according to the TCI instructions the recommended pump output for the R&P is 800-1000psi and 2.0 gallons per minute.
So the pressure of the Thompson pump should not be much too high!
The question then arises as to whether the delivery volume is too high and the rack-and-pinion steering cannot handle it?
Whining is usually low fluid and low pressure. In your case with the foaming and overspill I would install a cooler. This is the one that I used on my truck. It is a lot more rugged than most.
Whining is usually low fluid and low pressure. In your case with the foaming and overspill I would install a cooler. This is the one that I used on my truck. It is a lot more rugged than most. Amazon - Derale power steering cooler
Yes, an experienced friend also recommended a cooler to me, this should be particularly necessary for the big block. However, I thought that the distance traveled was so short that overheating could still be ruled out.
Pete this Amazon link does not show me the cooler, do you have another link or a part number?
And is there any idea why the steering feels bit spongy / overassist ?
Yes, an experienced friend also recommended a cooler to me, this should be particularly necessary for the big block. However, I thought that the distance traveled was so short that overheating could still be ruled out.
Pete this Amazon link does not show me the cooler, do you have another link or a part number?
And is there any idea why the steering feels bit spongy / overassist ?
That link took me right to the correct location. Try searching on Amazon for "Derale 13260 Dual Pass Aluminum Heat Sink Cooler".
Factory shop manual has a process to eliminate air trapped in system. Think it used a vacuum on the system for a length of time without engine running. A cooler would be a plus. Most cars with AC had a cooler when the Thompson came out, as the years passed and hotter engines, everything had them.
Factory shop manual has a process to eliminate air trapped in system. Think it used a vacuum on the system for a length of time without engine running. A cooler would be a plus. Most cars with AC had a cooler when the Thompson came out, as the years passed and hotter engines, everything had them.
probably not trapped air rather fluid aeration due to heat or wrong fluid. The cooler is your best bet.
In the meantime i got such a cooler and fabricated some brackets, now i have to purchase some Hose...
but since we got snow last night it will take some time until i can test it...
Since I will need a new hose can anyone tell me which connection I need for this pump? As I am about to convert to hydroboost, I need a new connection for the Hose to the servo pump, but I don't know the name of the thread and the seal seat.
Can the connection on the hexagon be loosened from the pump? Which thread is behind it?
It looks like a standard JIC (37degree) fitting. If you can get a tool down the to measure the angle that would confirm it. The other option woud be that it is an AN fitting, but IIRC none of those were AN.
OK i had a chance to test AN, it is too little for AN8 and it ist too big for AN6, so it is not an AN fitting.
It seems to be an 5/8-18 JIC fitting, but i can´t find a connector to this fitting.
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