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PostPosted: Mon May 11, 2009 1:40 am 
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Joined: Thu Jul 06, 2006 7:37 am
Posts: 33
Location: San Francisco, CA USA
Hi,

I'm in the process of rebuilding my rear wet subframe and a problem that I've known I need to deal with, but have been putting off, is replacing the knuckle joints on my rear displacer struts.

The problem is that the knuckle joints are completely frozen to the displacer struts and I cannot get them off. I've tried using a rust penetrator like WD-40, but with no results. I've heard that heat might do the trick, but I'm not sure how that works in this application. Would I simply heat the area where the knuckle joint meets the displacer strut and then use a hammer to loosen it?

I'd appreciate some advice on how any of you would go about solving this problem:)

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PostPosted: Tue Feb 13, 2018 8:05 pm 
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998cc
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Joined: Wed Jul 08, 2015 3:29 pm
Posts: 647
Location: Brisbane QLD
My prob too ...any hints?



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Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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PostPosted: Tue Feb 13, 2018 8:17 pm 
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998cc
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Joined: Mon Mar 10, 2014 11:38 am
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Location: Tassie
Leave it soaking in a molasses mixture. It will seperate then.
It works on rusty threads with nuts!

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
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PostPosted: Wed Feb 14, 2018 5:21 am 
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848cc
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Joined: Sun Aug 17, 2014 3:54 pm
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Location: Willoughby, Sydney
I heated mine. Slipped a spanner over the narrow part of the knuckle joint where the round part meets flat and whacked with BFH. Came out easy.


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PostPosted: Wed Feb 14, 2018 3:37 pm 
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998cc
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Joined: Sat Feb 09, 2013 5:44 pm
Posts: 897
Location: Camden
I assume you mean getting the ball joint off the 3/4 inch round strut approx 13inches long?
I have put the strut in the vice with the ball facing down, held a dolly against one side of the ball and hit the other side of the ball with a heavy blunt instrument (or BFH).
The dolly helps direct the impact into the seized joint and not just push the whole strut sideways.


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PostPosted: Wed Feb 14, 2018 6:35 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
Related hijack...
I've got a front displacer where the knuckle joint is stuck inside the tapered alloy piston thingy. Out of the displacer. No way it will come apart. Have tried soaking with WD-40, hot air gun, etc. And the damned thing is tapered so can't get a good grip..
Top of piston is blind so I can't knock it out.
Ideas?

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


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PostPosted: Wed Feb 14, 2018 6:41 pm 
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998cc
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Joined: Sat Feb 09, 2013 5:44 pm
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Location: Camden
drmini in aust wrote:
Related hijack...
I've got a front displacer where the knuckle joint is stuck inside the tapered alloy piston thingy. Out of the displacer. No way it will come apart. Have tried soaking with WD-40, hot air gun, etc. And the damned thing is tapered so can't get a good grip..
Top of piston is blind so I can't knock it out.
Ideas?


Was going to suggest drilling a hole in the back of the cone and punching the ball pin out, with some Penetrene etc?
Afterwards, the drilled hole is completely covered by the rubber skirt of the displacer - or could be sealed with goo.


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PostPosted: Wed Feb 14, 2018 6:48 pm 
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Joined: Sat Feb 22, 2014 10:13 am
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Dr Mini if heating gun hasn't worked, how about MAPP torch/oxy level of heat (applied hot and fast, rather than slow and low so the differential heat can also play a part as well as high heat)? And perhaps the same for the original poster?

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PostPosted: Wed Feb 14, 2018 7:14 pm 
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998cc
998cc

Joined: Mon Mar 10, 2014 11:38 am
Posts: 1026
Location: Tassie
drmini in aust wrote:
Related hijack...
I've got a front displacer where the knuckle joint is stuck inside the tapered alloy piston thingy. Out of the displacer. No way it will come apart. Have tried soaking with WD-40, hot air gun, etc. And the damned thing is tapered so can't get a good grip..
Top of piston is blind so I can't knock it out.
Ideas?

Would sitting them in boiling water work? Different rates of expansion?

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt


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PostPosted: Fri Feb 16, 2018 7:28 am 
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998cc
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Joined: Wed Jul 08, 2015 3:29 pm
Posts: 647
Location: Brisbane QLD
Drmini believe it or not i have had this exact thing this week. In my case holding the cone and striking the knuckle slowly rotating it to get all sides .....eventually loosed it . Was able to pull it out. No vice needed except beer.
Problems:
- takes good aim
- bad aim results in sore fingers


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Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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