E32 Lower LAD Repair - Possible Solution

[drphilj]

Hi All

I have had an issues with the lower portion of the LAD shocks as it was leaking. I read through all the different postings (especially the advice of Shogun) and decide to have a go at it. I found that both the polyurethane seals at the bottom of the LAD had broken down. Decided to go off to my local hydraulic store to get a set of new of O-rings. I brought the actual seal along with the lower LAD hardware (see Patrick C 88 750 170K post http://www.bimmerboard.com/forums/posts/1245907 for pictures). I spent some time described what I was trying to do.

Luckily, he was able to get a replacement for the polyurethane seal from a company who specialises in theses 0O-ring seals. They were not very cheap and costs about $25.00AUD. But fitted perfectly and worked really well.
IMG_20200316_143516.jpgIMG_20200316_143549.jpg

The dimensions of the new O-ring seal are a match to the old one. The only slight difference is on the new O-ring seal it is slightly tighter around the shaft. As the new O-ring sealed is sitting within the nut is well supported against the hydraulic pressure of the LAD. Overall very satisfied with the seal and the shaft. I have reassembled the LAD and there appears to be no leak but time will tell. Overall really quite satisfied with the solution. I understand that using an O-ring does work most of the time.
IMG_20200316_143615.jpg
As time goes by I will report how successful this has been.

- Phil

[Sansouci]

Do you have the manufacturer's name and partnumber?

[shogun]

on Bimmerboard we were talking about LAD seal dimension: wiper seal DH 12x18x3.8mm probably that size, google for that size.
or enlarge the pic of the blue wiper seal, there is a number. see this link http://www.bimmerforums.com/forum/sh...0#post29214070

[drphilj]

Hi Sansouci and Shogun

Yes, I contacted the Ruffin Hydraulics in Geelong again to get some more information. I did get some technical information from them and I have attached it below. Like most companies they have this information but not available to the public.

LAD Wiper Seal.png

My problem now is to work out who manufactures this item which I am working on. The web page I have is https://www.hsa.com.au/product/18167...18-004-006-t-h
Having installed them they really look like a solution.

- Phil

If you need extra info PM me. ( I will share the info)...