1976 A4 Rear Swing Arm Help

  • Mikaw
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1976 A4 Rear Swing Arm Help

05 Mar 2017 17:22
#755875
I removed the swing arm form my A4. I want to do the roller bearing upgrade after powder coating. I easily removed the caps and bronze sleeves but can't get the center spacer out nor the bushing out. Items 6 and 7 on the included screen shot
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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  • SWest
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Re: 1976 A4 Rear Swing Arm Help

05 Mar 2017 17:38
#755876
You'll have to work on the lip on #6 using a flat punch prying it out a little at a time. Once out you can drive the other side out with a socket against the spacer.
Steve
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Re: 1976 A4 Rear Swing Arm Help

05 Mar 2017 19:51
#755881
SWest wrote: You'll have to work on the lip on #6 using a flat punch prying it out a little at a time. Once out you can drive the other side out with a socket against the spacer.
Steve
SWest, got a plan "B"??? The outer flange broke off of the #6 items. Can they be pressed out using the center spacer if I find a socket or bar stock the right size. My son has an arbor press. Is the center spacer #7 sought enough to push out the #6 bushing
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 09:09
#755920
They can be a bear to get out. You might start by removing the grease fitting (#15) and filling the tube with a good penetrating oil. Lots of guys (including me) swear by a 50/50 mix of ATF and Acetone. I've always been able to to catch the inside edge of the bushing (#6) with a long tapered drift punch and drive them out from the opposite side. Good Luck.
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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 09:23
#755921
Before you hammer away, put a little heat on it !!! You cannot work on an old bike without the blue tip wrench

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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 16:25
#755972
Thanks for the heat advise but I'd think that would work against you. The bronze will heat and expand at a lower temp the the steel locking it tighter. Or am I thinking backwards?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 16:28
#755973
You already have the bronze out right?
Steve

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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 17:18
#755976
Hello Mikaw

As MZD1rider say, the magic mechanic fluid ( 50/50 mix of ATF and Acetone ) will dissolve all the oxidation and dirt in your swing arm.
Let the magic mechanic fluid penetrating for 48 hours ( donĀ“t let it dry out ), heat is the last chance,( different thermal expansion steel/ bronze ). light shocks with a drift punch every 4 - 8 hour will support the penetrating of the magic mechanic fluid. Some things like this need some time or you will destroy your swing arm!!!

Michael
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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 19:04
#756001
SWest wrote: You already have the bronze out right?
Steve
Tried to catch the collar (lip) of the #6 item and it just broke the "lip" off


The center spacer #7 is free. It has enough grease on it to slide freely. It's the collared bushings #6 that won't budge.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 20:44
#756017
The center spacer should be smaller diameter than the collars. You should be able to push the spacer down and use a rod long enough to drive the collar out from the inside.
Steve
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Re: 1976 A4 Rear Swing Arm Help

06 Mar 2017 21:35
#756021
SWest wrote: The center spacer should be smaller diameter than the collars. You should be able to push the spacer down and use a rod long enough to drive the collar out from the inside.
Steve

Steve, if thats true then the swing arm must be bent as the center spacer #7 wont go past the collared #6 bushings. that may explain why the rear tire appears to be shifted to the left. I can slide the center spacer very easily, but it wont go past the collared bushing out either side.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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