LP2a SAR restoration

[Lynn Eades]

Yes there is quite a reasonable lateral pressure. The seal surface (pin collars) is grooved and the compressed seal is forced into the grooves under compression. The seal twists in itself as the suspension arm rotates, effectively no movement at the mating points. So, no, not a conventional seal. Find someone with a water cutter.

[Phillip]

Thanks, can anyone give me the accurate measurements for the new seal seals, I assume mine are a little compressed and if made to the same size would not seal.

[Lynn Eades]

I have one here that is 12mm thick. I suspect it is compressed to 11mm. It may be less.
There is a lip in one end of the bore (i.d.) measuring about 29mm, however the rest of the bore is approximately 31mm. i.d.
The lip is approximately 1mm wide.
It has a Patent no. (pat. no.) 360168 moulded into the side.
The o.d. is about 49.5mm but is scalloped (sp?) in the center (about 46.5mm. o.d. at center)
I'd ignore the lip and the scollap and as Andrew said have some cut from a piece of Nitrile (11mm is about the same as 7/16")
I had a box of NOS Aussie ones. If you dropped them on the floor they would break like glass.
When you install the shaft and collar, you will compress the two seals to get the bolt through. It would be good to do this with the bogie arm pointing at its normal working angle.
I hope that helps.

[Andrew Rowe]

Measure the width of the Bogie fork and then measure your gap between the suspension unit and divide x 2 to get the thickness of the seal. All the lips, etc in the original are there to over complicate a rather simple application. Do not make the seals too thick as you will swear a lot trying to get the fork in the housing, without wrecking the new seals. You may find different measurements for different housings, and you only need 1 mm or 2 mm compression on the rubber seals to work, and inside dia. is only a snug fit for the dia. of the shaft that goes through the fork. Cheers Andrew.

[Euan McDonald]

It would be a shame to open the box but is this what your after Phil?

[Phillip]

Thanks Euan, That's just teasing

But yes, I must have missed this picture it in the spare parts cattle dog (or it's on page 13, which I still don't have!).

It does confirm that my seals are out of original specification as they measure over 2" in external dia. From Andrew and Lynn's posts the sealing comes from them being squashed laterally. Given the material, I'm guessing that this 'squeeze' will be minimal so the thickness is what I need to work out.

I've now just got to find a company to cut them.

[Lynn Eades]

Euan, if you do open the box,you will probably be disappointed (that is, if you wanted to use them) To look at, they will be fine. I have tried to soften them, with no joy.

Check out the thread I started post #2, "Carrier Soft Parts" It relates to riveted carriers, but I am guessing the Shafts, Collars, Bushes, and Seals would inter change across to the Aust. Carrier. If I recall, the Aust. seal does not have the internal lip or the external scallop, but looks rather like it is wound from a thin strip of flat rubber.