pump flow rate

[johngosnell]

Has anybody got info on the flow rate and pressure of the power steering pump for the Jag 420 which has the oil reservoir and pump built as one unit.


Regards John

1B1257BW

[Glyn Ruck]

The Saginaw pump used with the Varamatic steering on the 420 typically ran at +- 1200 psi. No idea of flow rate. Never seen it quoted.

[johngosnell]

Thanks for the reply , I had wrongly assumed that the pump was a Different model of the Holbourn Eaton pumps.


Regards John

1B1257BW

[Glyn Ruck]

No ~ The Varamatic pump with integrated reservoir as used on the 420, 420G was a Saginaw.

[cass3958]

Glyn I have seen this type of pump you are calling a Saginaw on the 420. It is bolted to the side of the engine over the top of the distributor and is powered by a belt coming off the water pump. Makes getting to the top of the distributor cap a bitch of a job. The pump sits below the reservoir. Are you sure that this was fitted to the later S Types. As you know mine is quite a late Sept 1967 manufactured car and I have the old Eaton pump off the back of the Generator.
I believe this Saginaw pump was fitted as the 420 was negative earth and had an alternator fitted without the takeoff on the back for the Eaton PAS pump. The S Type was still Positive earth and running off the generator up to the end of production as I believe. I have not seen any manuals stating the S Type was converted to Negative earth, fitted with an alternator or this PAS system at the very end from factory but am willing to be educated.
Attached are a couple of photos of the 420 PAS pump and where it is fitted on the 420 engine.

[John Quilter]

I tend to agree with Cass3958.

[Glyn Ruck]

Glyn I have seen this type of pump you are calling a Saginaw on the 420. It is bolted to the side of the engine over the top of the distributor and is powered by a belt coming off the water pump. Makes getting to the top of the distributor cap a bitch of a job. The pump sits below the reservoir. Are you sure that this was fitted to the later S Types. As you know mine is quite a late Sept 1967 manufactured car and I have the old Eaton pump off the back of the Generator.
I believe this Saginaw pump was fitted as the 420 was negative earth and had an alternator fitted without the takeoff on the back for the Eaton PAS pump. The S Type was still Positive earth and running off the generator up to the end of production as I believe. I have not seen any manuals stating the S Type was converted to Negative earth, fitted with an alternator or this PAS system at the very end from factory but am willing to be educated.
Attached are a couple of photos of the 420 PAS pump and where it is fitted on the 420 engine.

My bad Rob ~ you are correct. That is a Saginaw. The last S Types used a Hobourn Eaton with Varamatic. 420, Daimler Sovereign, 420G used an American made Saginaw pump with rest of the Varamatic built under license by Adwest from Bendix Corp. I have corrected.

Last S Type Varamatic.

8699806.jpg (52 KiB) Viewed 3276 times

[cass3958]

Thanks but know that you have edited and corrected your post Glyn mine does not make sense anymore. lol. I was not trying to correct you I was merely making a suggestion and trying to clarify your comment as I thought you knew better.lol.
With the knowledge we have on this forum I was sure we would get the correct answer eventually. Thank you again.

[Glyn Ruck]

Your comment still makes sense as I say I've corrected. Please correct me if you notice errors or query me if you think I'm wrong. I make mistakes like all of us. I'm not the sensitive type. I should have thought more clearly about my reply. I thought one of my James Taylor books had mentioned a very late change but I've checked & I was wrong. Should have checked before responding.