S/A bushes too long? Advice and guidance please

[KeithJ]

Have replaced metalastic bushes in my A10 S/A and have just gone to fit it in the frame.  I find the gap between the frame is much smaller than the overall length of the bushes which stick out of the S/A.

The gap between the frame is 9.350" and the width across the bushes is 9.490".
This gives an interference of 0.140".

Can anyone confirm the nominal dimension of the frame of 9.350"is correct?  Just found this web site http://bsa-a10.hailwood.com/1954abgoldstar.html which has frame dimensions and shows it it is 9.373"/9.383".

The bush centres stick out of the S/A by 0.140".  Is this what it should be?
Also, can anyone tell me the overall length of the metalasitic bush?  I can then check they are in to the correct depth.

When I took the S/A out it appeared to come out of the frame without any undue problems, the bushes are from a reputable supplier and the they appear to be home to full depth as outers are flush with the S/A.

ATB

Keith

[muskrat]

G'day Keith. The frame should be 9.373" to 9.373" between the plates. Usually a tight squeeze to get the s/arm in but not that much.
Cheers

[KiwiGF]

I had a similar issue see http://www.a7a10.net/forum/index.php?topic=4293.msg30591#msg30591

[KeithJ]

Thanks for the link.  I see the outer of the bushes was proud of the S/A.  Was this how they were fitted?
ATB
Keith

[beezermacc]

First of all I would check that the bushes are fully home. If you put a threaded bar through the middle and tighten the nuts up any movement in the inner sleeves indicate the bushes are not fully home.

[KeithJ]

Yup, done that.  Looks OK but that's why I asked for the bush dimensions so I can confirm.
ATB
Keith

[beezermacc]

Hope the attached pic helps......

[KeithJ]

Brilliant!  Now just need to know if the outer or inner of the bushes "bottom out" when inserted.

The outers of my bushes are flush with the S/A and the inners stick out 0.140" as opposed to the (3.04mm) 0.125".  So I am still 0.1" adrift.  Will have another look. 
Thanks for the help.

ATB

Keith

[beezermacc]

The inner sleeves of the bushes should butt up against each other in the middle of the swinging arm; If this is the case and the outer sleeves are flush with the swinging arm tube there's not much more you can do.

[KiwiGF]

hi Keith, I needed to make a steel bush that fitted inside the swing arm as the outer diameter of the blocs needed to been not proud but inside the swing arm by about a 1/32". There is a pic of that bush pushing them that extra 1/32 "on that same post.

Quoting that post:

"The only slight issue was that the width over the blocs once they were installed was 1/16 too wide to fit in the frame (even thought the blocs are touching inside the swing arm) but I'll fix that by grinding a little off the blocs. If I did the job again I would measure up everything first and mod the blocs before fitting them.

I found the outer tube of the blocs fits slightly inside of the swing arm so I had to modify one of the 2 steel bushes I had made up to press on the ends of the outer tube of the blocs (without touching the inner tube)  so that it fitted fit inside the swing arm and could press the bloc in that extra 1/32."

[KeithJ]

Thanks for that info.  Will check the dimensions of my metal blocks.
ATB

Keith

[bsa-bill]

some S/A have a central stop, both mine have , whether this stop is by design or providence seem to be questionable but in both mine it is exactly central so makes fitting bushes a little easier, although  removal of course not so easy

[duTch]

..another reason why I like my Plunger