Burman PAS box bleed screw

(DavidMK2) #1


When I rebuilt my late Burman PAS box, the leaks were mainly solved, but I have one from the bleed screw, which I am struggling to fix.

The bleed screw came with an oversize washer and what I thought was an o ring, but now I am thinking that this might be a Dowty seal or washer?
Can anyone confirm?


(Robin O'Connor) #2

Not sure when doughty seals came into existence, my box has a fibre washer on the bleed/level screw if thats any help.

(KrissMotors) #3

I believe that part is C2296/5 described as a filler plug washer, not anything special except for its dimensions.

(tony) #4

I would personally try some thread sealant, even teflon tape, on the threads to stop migration, and a fibre washer with Permatex non-setting, to seal the flat

(DavidMK2) #5


Thanks for the comments.

This is the bleed screw on the PAS box, so it should be a high pressure seal, so I would think it needs either a metal to metal or o ring/rubber in there somewhere?
I don’t think a fibre washer sounds right.
If I seal it up it will not work as a bleed screw?
I cannot find C2296/5 anywhere - I see C2296/2 which is a sump plug seal …

In the end I have sealed it with an o ring and have some 1/8" BSP dowty seals coming to see if they fit. The problem with using an o ring is that as soon as you try and use it as a bleed screw the seal seems to be destroyed. I have driven it around without bleeding it and there are no leaks - however, I still have slightly different steering response left and right, so would like to bleed.

The bits I am talking about are 14 and 15 in the diagram below, but I have no legend and don’t know where this came from - is a later version of the box than is in the workshop manual or Haynes manual.

Regards and thanks

(Rod Fyfe) #6

Hi David,
I have a Burman P/S box ex a 66 S Type. Not fitted as yet, needs reconditioning. I would be interested in anything you did to modify in order to ensure no leaks.
Rod, Adelaide, Aust.