XJ6 & XJ12 Series I, II & III 1968-1992

Power steering pump for 350 V8 conversion?

 
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Old 09-13-2016, 04:47 PM
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Default Power steering pump for 350 V8 conversion?

Can I run a mid 80s GM power steering pump with the Jaguar rack? It's the O-ring style power steering pump. Don't know what the Jaguar rack line pressure is. I think this pump I have is 1100-1200psi
 
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Old 09-13-2016, 04:58 PM
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Default Yes

Originally Posted by Hafrod View Post
Can I run a mid 80s GM power steering pump with the Jaguar rack? It's the O-ring style power steering pump. Don't know what the Jaguar rack line pressure is. I think this pump I have is 1100-1200psi
Yes. Jaguar used a GM pump.
 
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Old 09-13-2016, 06:37 PM
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Default PS pump

I used a GM pump that was on the v8 engine when I bought it. Added new hose(s) and swapped in the pressure relief valve from the Jag (GM) pump.
 

Last edited by alynmurray; 09-13-2016 at 06:39 PM.
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Old 09-14-2016, 12:20 AM
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Originally Posted by alynmurray View Post
... swapped in the pressure relief valve from the Jag (GM) pump.
If I do that will I get my one-finger steering back?
(';')
 
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Old 09-14-2016, 12:25 AM
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Should do.
 
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Old 09-14-2016, 09:19 AM
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There is a way. Some GM pumps match Jaguar racks better than others.
I think Andrew Weinberg's Jaguar-specialties site has a section on it.
It is a function of pressure relief valves and orifice size. I can only comment from what I've read.


Now, the later GM pumps as used in my LT1 and I think in the LS series match about right. Mine suits me. Enough boost to make driving easy, but not over boosted to make it skittish.


In the early days of PS, MOPARS were known for "over boost".


Somewhere on the web is a You Tube description of a four wheeler's
changes to this pump to accommodate their needs, huge tires!!! More boost sought there. But, definitely informative.


Just though of it. The relation of the size of the pulley on the pump to that on then crank shaft. That RPM thing.


So, Hafrod, plumb it in, try it and see if it suits you. It might just be.


Carl
 
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Old 09-14-2016, 09:32 AM
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LnrB,... you might get the one finger steering back if it was there prior to the engine swap... also the original size steering wheel plays a part in determining the effort (leverage) the driver must use to steer the car.

Do you have strong fingers/arms/shoulders and original diameter steering wheel ?
 
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Old 09-14-2016, 09:36 AM
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LnrB,... you might get the one finger steering back if it was there prior to the engine swap... also the original size steering wheel plays a part in determining the effort (leverage) the driver must use to steer the car.

Do you have strong fingers/arms/shoulders and original diameter steering wheel ?

 
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Old 09-14-2016, 09:52 AM
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Alyn:


Elinor is a farm raised gal and now works with machines. I'm sure her fingers, arms and shoulders are quite strong....


Elinor:


A new PS pump? If so, do you still have the old one that provided the boost that you like? If so, swap out the top, as Alyn did. I think that is what Andrew suggests as well.


And, as Alyn says, go cart sized wheel vs bus size makes a huge difference.


Carl


Carl
 
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Old 09-14-2016, 05:19 PM
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My main concern is a higher pressure pump blowing out my old rack seals. Don't know if it's even possible but it was a thought that popped up in my head
 
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Old 09-14-2016, 05:48 PM
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It's the same pump but NOT the same rack!

Amid that massive suspension (and other things) refurbishment last year we had to put on a S3 rack. Steering effort is at least tripled if not more. Steering wheel is original from factory.

The "new" rack already had a leak in the tower seal, but the old one leaked Way worse and at every joint, and used to get 'stuck' going around a right turn in town at low revs.

I have a factory Jag pump from a S3. But I'm thinking this is a project for when Winter sets in and I don't mind having the car down for a time while I figure this out and learn for sure that it won't blow All the seals as Hafrod fears.
(';')
 
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Old 09-15-2016, 08:45 AM
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LnrB,..
I think the valve relief spring is calibrated for the rack that came matched with it from the factory. That is why I changed mine (installed the valve relief spring from the PS pump that was on the Jag engine,...into the pump on the GM V8 engine

So the S3 pump should work fine -give you the same boost as found on S3 cars (as long as the original valve relief spring is still inside the S3 pump),..
 
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Old 09-15-2016, 07:27 PM
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What fluid should I use? What I drained out was red like transmission fluid.
 
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Old 09-15-2016, 08:23 PM
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Originally Posted by Hafrod View Post
What fluid should I use? What I drained out was red like transmission fluid.
The pump wont care. In Series 2 racks, Jaguar Specified ATF type F. On series 3 racks they specified Dextron 2D which is NLA. I've always used GM power steering fluid which is clear-ish with good results. Many racks, no leaks.
 
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Old 09-16-2016, 02:05 AM
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Yeah, lately, I've used generic PS fluid and it works just fine. In past years, in other critters, I've used ATF with no issues.


Might well be the same or similar and it is merely the package.


Hafrod:
I doubt that any of the combinations are going to blow the seals in any of the Jaguar racks. Caveat, if they are healthy. Fresh pump, good PSI, marginal seals in older rack, just might blow the seals in he rack.


Go for it sand see!


Carl
 
 
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