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1967 340. Steering box leaking from the input shaft and inner steering column. I've read all the posts and to be quite honest still kinda confused. From what I've gleaned I have a Burman power steering box or that's what it looks like. Can that seal be replaced without pulling the box from the car?
Long answer is you have to be certain which steering box you have as I think the 340 from 1967 was fitted with the later Marles Adwest PAS box which is the better box and very easy to work on once it is removed from the car. Below are two photos showing the Burman Type2 PAS box fitted to the earlier Mk2 and S types and then below that the Marles Adwest Variomatic PAS box which was fitted to the Later S types, the 420 and as far as I am aware to the 240 and 340 variants of the Mk2.
The Burman has a round cast iron top with six bolts. The Adwest has a square Aluminium top with 4 bolts.
Once you have worked out which box you have we can then point you to threads that have been written describing how to remove and replace the seal.
Someone damaged the seal sliding it over the splines without due precaution. The splines must be covered & then greased. Even plenty of cling wrap will do the job of protecting the fitment of a new input shaft seal. As Cass says ~ box out. It's fairly easy.
Since it's a US 340, it might be one of the 'intermediate' cars. It could have a late Burman or a Marles Adwesr steering box. The only way to know is look.
might want to "gently" request the number of boxes removed and resealed by responders and how recently the work has been done. otherwise, although the responses may well be appreciated, their use to you may pale in comparison.
Sorry can't help with the Burman but if it is anything like the Adwest I had to strip the box down to be able to remove the main seal as it was recessed into the box over the main shaft, held in place with a circlip and a metal cover washer. There is no way or at least very little chance of getting anything on the old seal to remove it.
Someone who has worked on the Burman Type two might be able to assist with a method of removing the main shaft seal without dismantling the box.
might want to "gently" request the number of boxes removed and resealed by responders and how recently the work has been done. otherwise, although the responses may well be appreciated, their use to you may pale in comparison.
... and a sound thought as it's looking very unlikely that any of us has taken apart a later Burman PAS box. The not directly helpful reply 'read the Jaguar Service Manual' may well be be as good as it gets.
I did mine many years ago, I didn't post because I don't have much memory of taking it apart, but I will post anyway.
Notice the joint pointed out by the red arrow, that section of spline is held in place by a snap ring if I remember correctly, you should see it if it's there.
I think that section of spline operates the torsion bar or quill valve of the unit allowing more or less pressurized fluid into one chamber or the other.
I believe there is an 0-ring sealing the bar to the main shaft, that gets quite hard with age and it's a source of leakage; from memory the entire "worm" may have to be removed to gain access to that 0-ring.
Again this is from memory only.
I believe you can get at the various seals just by removing the cover, but you will be faced with a bunch of lose rollers when disassembled.
Jeff your memory is spot on. If the main input seal is not leaking you simply need a new O ring on the torsion bar shaft. My guy gets a second Type Burman out in half an hour & back in in half an hour. So you are new to it. Make it 2 hours out & 1 hour back in from your learnings.
O ring is on 10 (torsion bar) in diagram & visible. Observe whether your leak is at 11 (main seal) or end of shaft. (Jeff's Red arrow)
Last edited by Glyn M Ruck; May 8, 2023 at 04:33 PM.
Power Steering Box Leaking
