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Hydrolastic displacer question

Posted: Thu Jan 02, 2025 3:55 am
by Gary Schulz
I have a question regarding the hydrolastic displacers I removed from the front subframe in this thread- viewtopic.php?t=39726

In order to remove the old corroded knuckles, I found that I had to remove the cup/cone that was attached to the bottom of the displacers so I could apply heat to get the old knuckles out. Are these cup/cones glued in-place or do they just snap into the bottom the the displacer? One of them came off while wrestling with the ball/cup in the upper control arm and the other I had to pry out to remove it.

The picture below shows the bottom the one of the displacers and the cup (upside down) that was attached to the bottom of the displacer...
IMG_5331.jpg
What holds it in place?

Re: Hydrolastic displacer question

Posted: Thu Jan 02, 2025 4:03 am
by winabbey
It's simply an interference fit. The lip you see on the cup holds it place when forced into the hole in the displacer rubber.

Re: Hydrolastic displacer question

Posted: Thu Jan 02, 2025 10:29 am
by Gary Schulz
winabbey wrote: Thu Jan 02, 2025 4:03 am It's simply an interference fit. The lip you see on the cup holds it place when forced into the hole in the displacer rubber.
Perfect, that seemed to be the case.

Thank you

Re: Hydrolastic displacer question

Posted: Thu Jan 02, 2025 11:00 am
by Andrew1967
I've found best way to refit them is to very slightly pressurize so the rubber expands outwards, then put the cup into position and depressurize, the displacer then draws the cup into place.