Pressing shock absorber bushes
Discussion
My car needs the shock absorber bushes on the fronts changing and it has the larger 42mm (C0414) bushes at the top and standard 27mm wide ones at the bottom (C0092).
Has anyone tried pressing them out (and also installing them) using a ball joint press? Something like this:
https://www.amazon.co.uk/Heavy-Duty-Joint-Press-Re...
Basically a large, strong C-clamp with a selection of receptacle cups. Obviously, you'd need some suitable sockets to press with too.
I was wondering if the C-clamp and a big breaker bar or an impact driver would be up to the job of pressing out the larger 42mm diameter top bush. I'm sure it could handle the smaller one.
I contacted Ben at Blackdown Auto and he said that a 5 ton press would be needed as a minimum. He uses a 10 ton press for his word. I contacted my local independent garage that MOTs my TVR but they don't have a press (just a big vice).
What are your thoughts please?
Has anyone tried pressing them out (and also installing them) using a ball joint press? Something like this:
https://www.amazon.co.uk/Heavy-Duty-Joint-Press-Re...
Basically a large, strong C-clamp with a selection of receptacle cups. Obviously, you'd need some suitable sockets to press with too.
I was wondering if the C-clamp and a big breaker bar or an impact driver would be up to the job of pressing out the larger 42mm diameter top bush. I'm sure it could handle the smaller one.
I contacted Ben at Blackdown Auto and he said that a 5 ton press would be needed as a minimum. He uses a 10 ton press for his word. I contacted my local independent garage that MOTs my TVR but they don't have a press (just a big vice).
What are your thoughts please?
Steve_D said:
Re the dampers steel or ali bodied?
If ali then the bushes will be corroded in and will most likely split the housing if you try and press them.
Better to cut the bushes out and perhaps use poly bushes as replacements.
If cutting them out then rather than drilling or burning the rubber us a hole saw. Much quicker and less smell.
Steve
My shocks are the standard Bilsteins with the large top bush and smaller lower bush. Can't use polybushes for the tops as they aren't available as far as I know.If ali then the bushes will be corroded in and will most likely split the housing if you try and press them.
Better to cut the bushes out and perhaps use poly bushes as replacements.
If cutting them out then rather than drilling or burning the rubber us a hole saw. Much quicker and less smell.
Steve
Well - I decided to buy the cheapest ball joint press on eBay and guess what - it worked! Using penetrating oil helped too.
I had some old rear shocks to try this out on with the 27mm C0092 bushes fitted. Firstly, the top bush. I used suitable sockets and a 60cm breaker bar for leverage. I could have used an impact gun but I preferred to do this carefully in case something went pop.
Here is an example pic of my setup.
Note the thread is well oiled and the head of the press is greased. Give it some ummph and you hear a crack as it starts to move. Mine were quite old and corroded as you can see. Adding more penetrating oil after the first movement really helped and it was simple to continue to press them out.
The hole at the end of the press was a suitable size to run out the bush as my large socket (32mm) wasn't quite deep enough.
Easy peasy. Now to try the bottom ones. These were more corroded and initially wouldn't budge. I ran out of ummph before the press did as I was just levering against the shock on the floor with the breaker bar. Anyway, I knew I needed a different approach so I ran a hacksaw through the centre with the centre metal sleeve still in and made a cut through the metal sleeve, through the rubber material and almost to the edge of the bush without breaking through. This was easy to do in the vice.
Now I setup the press again, a little penetrating oil and this time it moved just like the top one.
As you can see, this bush had been damaged in some way by a previous installer and this had added to my struggle. The pics hopefully show that I didn't cut all the way through the bush and score the shock eye.
This method works by releasing some of the strain of the bush in the shock absorber eye and allowing the cut to collapse a bit as the bush starts to move under load.
So for more practice I repeated my method on my other old rear shock and pushed out the bushes in the same manner, a relief cut being required for the more corroded bottom bush. I did those two bushes in less than 30 mins all by hand with no cold chisels or damage to the shock eyes at all. I could see when I'd pushed out the bushes where previous owners had nicked the eyes in the past.
Here is a pic of the second bottom bush that I had relief cut.
This gives me confidence now to tackle the fronts on my car now and the bigger top 42mm C0414 bushes should push out using the same method. Total cost was £25 for the press.
Hope this helps people.
I had some old rear shocks to try this out on with the 27mm C0092 bushes fitted. Firstly, the top bush. I used suitable sockets and a 60cm breaker bar for leverage. I could have used an impact gun but I preferred to do this carefully in case something went pop.
Here is an example pic of my setup.
Note the thread is well oiled and the head of the press is greased. Give it some ummph and you hear a crack as it starts to move. Mine were quite old and corroded as you can see. Adding more penetrating oil after the first movement really helped and it was simple to continue to press them out.
The hole at the end of the press was a suitable size to run out the bush as my large socket (32mm) wasn't quite deep enough.
Easy peasy. Now to try the bottom ones. These were more corroded and initially wouldn't budge. I ran out of ummph before the press did as I was just levering against the shock on the floor with the breaker bar. Anyway, I knew I needed a different approach so I ran a hacksaw through the centre with the centre metal sleeve still in and made a cut through the metal sleeve, through the rubber material and almost to the edge of the bush without breaking through. This was easy to do in the vice.
Now I setup the press again, a little penetrating oil and this time it moved just like the top one.
As you can see, this bush had been damaged in some way by a previous installer and this had added to my struggle. The pics hopefully show that I didn't cut all the way through the bush and score the shock eye.
This method works by releasing some of the strain of the bush in the shock absorber eye and allowing the cut to collapse a bit as the bush starts to move under load.
So for more practice I repeated my method on my other old rear shock and pushed out the bushes in the same manner, a relief cut being required for the more corroded bottom bush. I did those two bushes in less than 30 mins all by hand with no cold chisels or damage to the shock eyes at all. I could see when I'd pushed out the bushes where previous owners had nicked the eyes in the past.
Here is a pic of the second bottom bush that I had relief cut.
This gives me confidence now to tackle the fronts on my car now and the bigger top 42mm C0414 bushes should push out using the same method. Total cost was £25 for the press.
Hope this helps people.
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