Bother with my bush

BX Tech talk
User avatar
cauchoiskev
BXpert
BXpert
Posts: 282
Joined: Mon Aug 15, 2005 11:36 am
Location: France

Bother with my bush

Post by cauchoiskev » Tue Jan 26, 2016 10:11 pm

Front wishbone bush, that is. I've had the bits for years and been meaning to replace them, so having a bit of free time this morning, I tried it.

Everything went reasonably well until I tried to get the threaded pin out. It seems to be rusted solid on the bushes. I tried hammering it backwards to loosen it, but that just distorted the rubber. Then I tried to wind it out from the front with a spanner as a spacer, but it won't budge.

So, now I'm looking at knocking up some kind of DIY inertial hammer type tool, but if anybody has some simple miracle solution for this...

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Bother with my bush

Post by KevR » Wed Jan 27, 2016 9:38 am

I've always managed it using the front nut and series of spacers - never had any joy using a slide hammer. I suspect you'd need a seriously chunky one.
To start with you could try to get the pin moving by putting two nuts on each end and locking them off against each other, then trying to turn it with two spanners at once. Heat is always a good idea too, although trickier if you don't want to set fire to the bushes...
All this is assuming you haven't already liberally soaked everything in releasing fluid for days on end - if you haven't, you should...
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

Tinkley
1K Away
1K Away
Posts: 1495
Joined: Sat Jun 06, 2009 11:27 am
Location: N Hants England
x 6

Re: Bother with my bush

Post by Tinkley » Wed Jan 27, 2016 9:49 am

You have three options as I see it. One is drop the entire subframe and then you can really hit the end of the spindle/pin. Take care of the thread though. You can also try and force a wedge into the other end to help. It may also allow you to destroy the rubber with heat, maybe burn through it, or cut it, though I've not tried this myself, then saw the inner bush sleeve part off. You will need to saw the outer part of the bush (in the wishbone) anyway, unless you have access to a reasonable press.

Second option is to work the pin out using the front nut against some spacers, but if it really rusted solid....

The third option is to find and buy a new spindle/pin (16mm on later post '85? models), saw through the pin and remove wishbone. Grease the hell out of the pin and bush on reassembly. The spindle/pin will only come out forward, which is pretty obvious, IF you leave the subframe in place.

If you can't get replacement spindles, and the second option does not work, I personally would drop the whole subframe. It's actually not too hard as long as the brake piping ends come undone relatively easily. You can support the steering rack in situ by tying it up.

AFAIK the pins are at least 8.8, maybe 10.9 steel so do not use anything with a lower tensile strength. The new bushes can be fitted by using a very good vice or press. They are a pretty tight fit, so clean the wishbone aperture with wet and dry and lubricate. Note there is actually a way round for the bushes to be pressed in, which is not obvious so check that out too.

User avatar
cauchoiskev
BXpert
BXpert
Posts: 282
Joined: Mon Aug 15, 2005 11:36 am
Location: France

Re: Bother with my bush

Post by cauchoiskev » Thu Jan 28, 2016 9:09 pm

Many thanks for the replies.

@KevR, I did try the two nut/two spanner trick, nothing doing. I only soaked the area when I hit the problem, so I will continue for a while before trying again.

@Tinkley, I really don't want to be dropping the subframe unless absolutely necessary. I was wrong : the bushes are not rusted to the pin, so it must be to the subframe itself. After a good long soaking, I'll try again with the front nut and spacers, but first I'll make up some kind of tool I can whack just in case...

Tinkley
1K Away
1K Away
Posts: 1495
Joined: Sat Jun 06, 2009 11:27 am
Location: N Hants England
x 6

Re: Bother with my bush

Post by Tinkley » Fri Jan 29, 2016 6:13 am

If I remember right the bushes have a steel outer sleeve which fits in the wishbone and a steel inner sleeve through which the spindle/pin goes through. In between the two steel sleeves is the rubber part. I would surmise that the inner sleeve is slightly rusted to the spindle.... :wink:
It cannot be held just by the rubber as there is no direct contact, unless the design changed, certainly on my '88 and '91 built cars this has been the case.
Soaking the rubber will destroy the rubber itself, if you use the right solvent and maybe this would release the bush. Again I've not tried this but know that the rubber does not like engine oil or LHM on it. I also do not know the exact rubber composition ie real rubber or synthetic such as polyurethane or it would be a bit easier to find an aggresive solvent.
If your using spacers, make sure you are forcing the inner sleeve not just the outer or it will just stretch the rubber and you won't get enough load on to shift it.

User avatar
Kitch
Over 2k
Posts: 6213
Joined: Sun Jul 03, 2005 9:36 pm
Location: Fareham, Hants
x 50

Re: Bother with my bush

Post by Kitch » Fri Jan 29, 2016 10:01 am

I went with:

*Nut removed from rear
*Tighten front nut up further than it is, to give you maximum thread to work with, plus back & forth motion helps a lot in these situations, and spray loads of fluid on the surface each time
*Spacer, washer and nut on front, tighten up again & remove
*Nut back on rear, tighten up again,
*Back to the front, only try to wind it even further
*Then the back
*Then the front
*If really, really stuck, use both nuts on one end as a locknut, then try and rotate the whole thing

Good luck!